079424a2cf
"git pack-refs" that races with new ref creation or deletion have been susceptible to lossage of refs under right conditions, which has been tightened up. * mh/ref-races: for_each_ref: load all loose refs before packed refs get_packed_ref_cache: reload packed-refs file when it changes add a stat_validity struct Extract a struct stat_data from cache_entry packed_ref_cache: increment refcount when locked do_for_each_entry(): increment the packed refs cache refcount refs: manage lifetime of packed refs cache via reference counting refs: implement simple transactions for the packed-refs file refs: wrap the packed refs cache in a level of indirection pack_refs(): split creation of packed refs and entry writing repack_without_ref(): split list curation and entry writing
3356 lines
89 KiB
C
3356 lines
89 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "object.h"
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#include "tag.h"
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#include "dir.h"
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#include "string-list.h"
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/*
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* Make sure "ref" is something reasonable to have under ".git/refs/";
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* We do not like it if:
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*
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* - any path component of it begins with ".", or
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* - it has double dots "..", or
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* - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
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* - it ends with a "/".
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* - it ends with ".lock"
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* - it contains a "\" (backslash)
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*/
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/* Return true iff ch is not allowed in reference names. */
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static inline int bad_ref_char(int ch)
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{
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if (((unsigned) ch) <= ' ' || ch == 0x7f ||
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ch == '~' || ch == '^' || ch == ':' || ch == '\\')
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return 1;
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/* 2.13 Pattern Matching Notation */
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if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
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return 1;
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return 0;
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}
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/*
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* Try to read one refname component from the front of refname. Return
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* the length of the component found, or -1 if the component is not
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* legal.
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*/
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static int check_refname_component(const char *refname, int flags)
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{
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const char *cp;
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char last = '\0';
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for (cp = refname; ; cp++) {
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char ch = *cp;
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if (ch == '\0' || ch == '/')
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break;
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if (bad_ref_char(ch))
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return -1; /* Illegal character in refname. */
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if (last == '.' && ch == '.')
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return -1; /* Refname contains "..". */
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if (last == '@' && ch == '{')
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return -1; /* Refname contains "@{". */
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last = ch;
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}
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if (cp == refname)
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return 0; /* Component has zero length. */
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if (refname[0] == '.') {
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if (!(flags & REFNAME_DOT_COMPONENT))
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return -1; /* Component starts with '.'. */
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/*
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* Even if leading dots are allowed, don't allow "."
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* as a component (".." is prevented by a rule above).
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*/
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if (refname[1] == '\0')
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return -1; /* Component equals ".". */
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}
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if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
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return -1; /* Refname ends with ".lock". */
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return cp - refname;
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}
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int check_refname_format(const char *refname, int flags)
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{
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int component_len, component_count = 0;
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if (!strcmp(refname, "@"))
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/* Refname is a single character '@'. */
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return -1;
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while (1) {
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/* We are at the start of a path component. */
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component_len = check_refname_component(refname, flags);
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if (component_len <= 0) {
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if ((flags & REFNAME_REFSPEC_PATTERN) &&
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refname[0] == '*' &&
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(refname[1] == '\0' || refname[1] == '/')) {
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/* Accept one wildcard as a full refname component. */
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flags &= ~REFNAME_REFSPEC_PATTERN;
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component_len = 1;
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} else {
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return -1;
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}
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}
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component_count++;
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if (refname[component_len] == '\0')
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break;
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/* Skip to next component. */
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refname += component_len + 1;
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}
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if (refname[component_len - 1] == '.')
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return -1; /* Refname ends with '.'. */
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if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
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return -1; /* Refname has only one component. */
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return 0;
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}
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struct ref_entry;
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/*
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* Information used (along with the information in ref_entry) to
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* describe a single cached reference. This data structure only
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* occurs embedded in a union in struct ref_entry, and only when
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* (ref_entry->flag & REF_DIR) is zero.
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*/
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struct ref_value {
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/*
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* The name of the object to which this reference resolves
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* (which may be a tag object). If REF_ISBROKEN, this is
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* null. If REF_ISSYMREF, then this is the name of the object
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* referred to by the last reference in the symlink chain.
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*/
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unsigned char sha1[20];
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/*
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* If REF_KNOWS_PEELED, then this field holds the peeled value
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* of this reference, or null if the reference is known not to
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* be peelable. See the documentation for peel_ref() for an
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* exact definition of "peelable".
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*/
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unsigned char peeled[20];
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};
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struct ref_cache;
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/*
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* Information used (along with the information in ref_entry) to
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* describe a level in the hierarchy of references. This data
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* structure only occurs embedded in a union in struct ref_entry, and
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* only when (ref_entry.flag & REF_DIR) is set. In that case,
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* (ref_entry.flag & REF_INCOMPLETE) determines whether the references
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* in the directory have already been read:
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*
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* (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose
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* or packed references, already read.
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*
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* (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose
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* references that hasn't been read yet (nor has any of its
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* subdirectories).
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*
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* Entries within a directory are stored within a growable array of
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* pointers to ref_entries (entries, nr, alloc). Entries 0 <= i <
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* sorted are sorted by their component name in strcmp() order and the
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* remaining entries are unsorted.
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*
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* Loose references are read lazily, one directory at a time. When a
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* directory of loose references is read, then all of the references
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* in that directory are stored, and REF_INCOMPLETE stubs are created
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* for any subdirectories, but the subdirectories themselves are not
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* read. The reading is triggered by get_ref_dir().
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*/
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struct ref_dir {
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int nr, alloc;
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/*
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* Entries with index 0 <= i < sorted are sorted by name. New
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* entries are appended to the list unsorted, and are sorted
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* only when required; thus we avoid the need to sort the list
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* after the addition of every reference.
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*/
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int sorted;
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/* A pointer to the ref_cache that contains this ref_dir. */
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struct ref_cache *ref_cache;
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struct ref_entry **entries;
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};
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/*
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* Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
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* REF_ISPACKED=0x02, and REF_ISBROKEN=0x04 are public values; see
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* refs.h.
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*/
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/*
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* The field ref_entry->u.value.peeled of this value entry contains
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* the correct peeled value for the reference, which might be
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* null_sha1 if the reference is not a tag or if it is broken.
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*/
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#define REF_KNOWS_PEELED 0x08
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/* ref_entry represents a directory of references */
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#define REF_DIR 0x10
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/*
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* Entry has not yet been read from disk (used only for REF_DIR
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* entries representing loose references)
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*/
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#define REF_INCOMPLETE 0x20
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/*
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* A ref_entry represents either a reference or a "subdirectory" of
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* references.
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*
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* Each directory in the reference namespace is represented by a
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* ref_entry with (flags & REF_DIR) set and containing a subdir member
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* that holds the entries in that directory that have been read so
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* far. If (flags & REF_INCOMPLETE) is set, then the directory and
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* its subdirectories haven't been read yet. REF_INCOMPLETE is only
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* used for loose reference directories.
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*
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* References are represented by a ref_entry with (flags & REF_DIR)
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* unset and a value member that describes the reference's value. The
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* flag member is at the ref_entry level, but it is also needed to
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* interpret the contents of the value field (in other words, a
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* ref_value object is not very much use without the enclosing
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* ref_entry).
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*
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* Reference names cannot end with slash and directories' names are
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* always stored with a trailing slash (except for the top-level
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* directory, which is always denoted by ""). This has two nice
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* consequences: (1) when the entries in each subdir are sorted
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* lexicographically by name (as they usually are), the references in
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* a whole tree can be generated in lexicographic order by traversing
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* the tree in left-to-right, depth-first order; (2) the names of
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* references and subdirectories cannot conflict, and therefore the
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* presence of an empty subdirectory does not block the creation of a
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* similarly-named reference. (The fact that reference names with the
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* same leading components can conflict *with each other* is a
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* separate issue that is regulated by is_refname_available().)
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*
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* Please note that the name field contains the fully-qualified
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* reference (or subdirectory) name. Space could be saved by only
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* storing the relative names. But that would require the full names
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* to be generated on the fly when iterating in do_for_each_ref(), and
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* would break callback functions, who have always been able to assume
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* that the name strings that they are passed will not be freed during
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* the iteration.
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*/
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struct ref_entry {
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unsigned char flag; /* ISSYMREF? ISPACKED? */
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union {
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struct ref_value value; /* if not (flags&REF_DIR) */
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struct ref_dir subdir; /* if (flags&REF_DIR) */
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} u;
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/*
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* The full name of the reference (e.g., "refs/heads/master")
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* or the full name of the directory with a trailing slash
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* (e.g., "refs/heads/"):
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*/
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char name[FLEX_ARRAY];
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};
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static void read_loose_refs(const char *dirname, struct ref_dir *dir);
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static struct ref_dir *get_ref_dir(struct ref_entry *entry)
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{
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struct ref_dir *dir;
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assert(entry->flag & REF_DIR);
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dir = &entry->u.subdir;
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if (entry->flag & REF_INCOMPLETE) {
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read_loose_refs(entry->name, dir);
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entry->flag &= ~REF_INCOMPLETE;
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}
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return dir;
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}
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static struct ref_entry *create_ref_entry(const char *refname,
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const unsigned char *sha1, int flag,
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int check_name)
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{
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int len;
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struct ref_entry *ref;
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if (check_name &&
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check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
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die("Reference has invalid format: '%s'", refname);
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len = strlen(refname) + 1;
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ref = xmalloc(sizeof(struct ref_entry) + len);
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hashcpy(ref->u.value.sha1, sha1);
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hashclr(ref->u.value.peeled);
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memcpy(ref->name, refname, len);
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ref->flag = flag;
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return ref;
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}
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static void clear_ref_dir(struct ref_dir *dir);
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static void free_ref_entry(struct ref_entry *entry)
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{
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if (entry->flag & REF_DIR) {
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/*
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* Do not use get_ref_dir() here, as that might
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* trigger the reading of loose refs.
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*/
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clear_ref_dir(&entry->u.subdir);
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}
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free(entry);
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}
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/*
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* Add a ref_entry to the end of dir (unsorted). Entry is always
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* stored directly in dir; no recursion into subdirectories is
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* done.
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*/
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static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry)
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{
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ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc);
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dir->entries[dir->nr++] = entry;
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/* optimize for the case that entries are added in order */
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if (dir->nr == 1 ||
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(dir->nr == dir->sorted + 1 &&
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strcmp(dir->entries[dir->nr - 2]->name,
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dir->entries[dir->nr - 1]->name) < 0))
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dir->sorted = dir->nr;
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}
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/*
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* Clear and free all entries in dir, recursively.
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*/
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static void clear_ref_dir(struct ref_dir *dir)
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{
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int i;
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for (i = 0; i < dir->nr; i++)
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free_ref_entry(dir->entries[i]);
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free(dir->entries);
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dir->sorted = dir->nr = dir->alloc = 0;
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dir->entries = NULL;
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}
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/*
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* Create a struct ref_entry object for the specified dirname.
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* dirname is the name of the directory with a trailing slash (e.g.,
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* "refs/heads/") or "" for the top-level directory.
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*/
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static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
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const char *dirname, size_t len,
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int incomplete)
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{
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struct ref_entry *direntry;
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direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1);
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memcpy(direntry->name, dirname, len);
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direntry->name[len] = '\0';
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direntry->u.subdir.ref_cache = ref_cache;
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direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
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return direntry;
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}
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static int ref_entry_cmp(const void *a, const void *b)
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{
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struct ref_entry *one = *(struct ref_entry **)a;
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struct ref_entry *two = *(struct ref_entry **)b;
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return strcmp(one->name, two->name);
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}
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static void sort_ref_dir(struct ref_dir *dir);
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struct string_slice {
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size_t len;
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const char *str;
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};
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static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
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{
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const struct string_slice *key = key_;
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const struct ref_entry *ent = *(const struct ref_entry * const *)ent_;
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int cmp = strncmp(key->str, ent->name, key->len);
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if (cmp)
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return cmp;
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return '\0' - (unsigned char)ent->name[key->len];
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}
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/*
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* Return the index of the entry with the given refname from the
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* ref_dir (non-recursively), sorting dir if necessary. Return -1 if
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* no such entry is found. dir must already be complete.
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*/
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static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len)
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{
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struct ref_entry **r;
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struct string_slice key;
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if (refname == NULL || !dir->nr)
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return -1;
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sort_ref_dir(dir);
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key.len = len;
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key.str = refname;
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r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries),
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ref_entry_cmp_sslice);
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if (r == NULL)
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return -1;
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return r - dir->entries;
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}
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/*
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* Search for a directory entry directly within dir (without
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* recursing). Sort dir if necessary. subdirname must be a directory
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* name (i.e., end in '/'). If mkdir is set, then create the
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* directory if it is missing; otherwise, return NULL if the desired
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* directory cannot be found. dir must already be complete.
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*/
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static struct ref_dir *search_for_subdir(struct ref_dir *dir,
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const char *subdirname, size_t len,
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int mkdir)
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{
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int entry_index = search_ref_dir(dir, subdirname, len);
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struct ref_entry *entry;
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if (entry_index == -1) {
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if (!mkdir)
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return NULL;
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/*
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* Since dir is complete, the absence of a subdir
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* means that the subdir really doesn't exist;
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* therefore, create an empty record for it but mark
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* the record complete.
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*/
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entry = create_dir_entry(dir->ref_cache, subdirname, len, 0);
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add_entry_to_dir(dir, entry);
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} else {
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entry = dir->entries[entry_index];
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}
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return get_ref_dir(entry);
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}
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|
|
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/*
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* If refname is a reference name, find the ref_dir within the dir
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* tree that should hold refname. If refname is a directory name
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* (i.e., ends in '/'), then return that ref_dir itself. dir must
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* represent the top-level directory and must already be complete.
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* Sort ref_dirs and recurse into subdirectories as necessary. If
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* mkdir is set, then create any missing directories; otherwise,
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* return NULL if the desired directory cannot be found.
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*/
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static struct ref_dir *find_containing_dir(struct ref_dir *dir,
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const char *refname, int mkdir)
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{
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const char *slash;
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for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
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size_t dirnamelen = slash - refname + 1;
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struct ref_dir *subdir;
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subdir = search_for_subdir(dir, refname, dirnamelen, mkdir);
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if (!subdir) {
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dir = NULL;
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break;
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}
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dir = subdir;
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}
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return dir;
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}
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|
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/*
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* Find the value entry with the given name in dir, sorting ref_dirs
|
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* and recursing into subdirectories as necessary. If the name is not
|
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* found or it corresponds to a directory entry, return NULL.
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*/
|
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static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname)
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{
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int entry_index;
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struct ref_entry *entry;
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dir = find_containing_dir(dir, refname, 0);
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if (!dir)
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return NULL;
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entry_index = search_ref_dir(dir, refname, strlen(refname));
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if (entry_index == -1)
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return NULL;
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entry = dir->entries[entry_index];
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return (entry->flag & REF_DIR) ? NULL : entry;
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}
|
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|
|
/*
|
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* Remove the entry with the given name from dir, recursing into
|
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* subdirectories as necessary. If refname is the name of a directory
|
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* (i.e., ends with '/'), then remove the directory and its contents.
|
|
* If the removal was successful, return the number of entries
|
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* remaining in the directory entry that contained the deleted entry.
|
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* If the name was not found, return -1. Please note that this
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* function only deletes the entry from the cache; it does not delete
|
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* it from the filesystem or ensure that other cache entries (which
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* might be symbolic references to the removed entry) are updated.
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* Nor does it remove any containing dir entries that might be made
|
|
* empty by the removal. dir must represent the top-level directory
|
|
* and must already be complete.
|
|
*/
|
|
static int remove_entry(struct ref_dir *dir, const char *refname)
|
|
{
|
|
int refname_len = strlen(refname);
|
|
int entry_index;
|
|
struct ref_entry *entry;
|
|
int is_dir = refname[refname_len - 1] == '/';
|
|
if (is_dir) {
|
|
/*
|
|
* refname represents a reference directory. Remove
|
|
* the trailing slash; otherwise we will get the
|
|
* directory *representing* refname rather than the
|
|
* one *containing* it.
|
|
*/
|
|
char *dirname = xmemdupz(refname, refname_len - 1);
|
|
dir = find_containing_dir(dir, dirname, 0);
|
|
free(dirname);
|
|
} else {
|
|
dir = find_containing_dir(dir, refname, 0);
|
|
}
|
|
if (!dir)
|
|
return -1;
|
|
entry_index = search_ref_dir(dir, refname, refname_len);
|
|
if (entry_index == -1)
|
|
return -1;
|
|
entry = dir->entries[entry_index];
|
|
|
|
memmove(&dir->entries[entry_index],
|
|
&dir->entries[entry_index + 1],
|
|
(dir->nr - entry_index - 1) * sizeof(*dir->entries)
|
|
);
|
|
dir->nr--;
|
|
if (dir->sorted > entry_index)
|
|
dir->sorted--;
|
|
free_ref_entry(entry);
|
|
return dir->nr;
|
|
}
|
|
|
|
/*
|
|
* Add a ref_entry to the ref_dir (unsorted), recursing into
|
|
* subdirectories as necessary. dir must represent the top-level
|
|
* directory. Return 0 on success.
|
|
*/
|
|
static int add_ref(struct ref_dir *dir, struct ref_entry *ref)
|
|
{
|
|
dir = find_containing_dir(dir, ref->name, 1);
|
|
if (!dir)
|
|
return -1;
|
|
add_entry_to_dir(dir, ref);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Emit a warning and return true iff ref1 and ref2 have the same name
|
|
* and the same sha1. Die if they have the same name but different
|
|
* sha1s.
|
|
*/
|
|
static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
|
|
{
|
|
if (strcmp(ref1->name, ref2->name))
|
|
return 0;
|
|
|
|
/* Duplicate name; make sure that they don't conflict: */
|
|
|
|
if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
|
|
/* This is impossible by construction */
|
|
die("Reference directory conflict: %s", ref1->name);
|
|
|
|
if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1))
|
|
die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
|
|
|
|
warning("Duplicated ref: %s", ref1->name);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Sort the entries in dir non-recursively (if they are not already
|
|
* sorted) and remove any duplicate entries.
|
|
*/
|
|
static void sort_ref_dir(struct ref_dir *dir)
|
|
{
|
|
int i, j;
|
|
struct ref_entry *last = NULL;
|
|
|
|
/*
|
|
* This check also prevents passing a zero-length array to qsort(),
|
|
* which is a problem on some platforms.
|
|
*/
|
|
if (dir->sorted == dir->nr)
|
|
return;
|
|
|
|
qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
|
|
|
|
/* Remove any duplicates: */
|
|
for (i = 0, j = 0; j < dir->nr; j++) {
|
|
struct ref_entry *entry = dir->entries[j];
|
|
if (last && is_dup_ref(last, entry))
|
|
free_ref_entry(entry);
|
|
else
|
|
last = dir->entries[i++] = entry;
|
|
}
|
|
dir->sorted = dir->nr = i;
|
|
}
|
|
|
|
/* Include broken references in a do_for_each_ref*() iteration: */
|
|
#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
|
|
|
|
/*
|
|
* Return true iff the reference described by entry can be resolved to
|
|
* an object in the database. Emit a warning if the referred-to
|
|
* object does not exist.
|
|
*/
|
|
static int ref_resolves_to_object(struct ref_entry *entry)
|
|
{
|
|
if (entry->flag & REF_ISBROKEN)
|
|
return 0;
|
|
if (!has_sha1_file(entry->u.value.sha1)) {
|
|
error("%s does not point to a valid object!", entry->name);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* current_ref is a performance hack: when iterating over references
|
|
* using the for_each_ref*() functions, current_ref is set to the
|
|
* current reference's entry before calling the callback function. If
|
|
* the callback function calls peel_ref(), then peel_ref() first
|
|
* checks whether the reference to be peeled is the current reference
|
|
* (it usually is) and if so, returns that reference's peeled version
|
|
* if it is available. This avoids a refname lookup in a common case.
|
|
*/
|
|
static struct ref_entry *current_ref;
|
|
|
|
typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data);
|
|
|
|
struct ref_entry_cb {
|
|
const char *base;
|
|
int trim;
|
|
int flags;
|
|
each_ref_fn *fn;
|
|
void *cb_data;
|
|
};
|
|
|
|
/*
|
|
* Handle one reference in a do_for_each_ref*()-style iteration,
|
|
* calling an each_ref_fn for each entry.
|
|
*/
|
|
static int do_one_ref(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct ref_entry_cb *data = cb_data;
|
|
int retval;
|
|
if (prefixcmp(entry->name, data->base))
|
|
return 0;
|
|
|
|
if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
|
|
!ref_resolves_to_object(entry))
|
|
return 0;
|
|
|
|
current_ref = entry;
|
|
retval = data->fn(entry->name + data->trim, entry->u.value.sha1,
|
|
entry->flag, data->cb_data);
|
|
current_ref = NULL;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in dir that has index in the range
|
|
* offset <= index < dir->nr. Recurse into subdirectories that are in
|
|
* that index range, sorting them before iterating. This function
|
|
* does not sort dir itself; it should be sorted beforehand. fn is
|
|
* called for all references, including broken ones.
|
|
*/
|
|
static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
int i;
|
|
assert(dir->sorted == dir->nr);
|
|
for (i = offset; i < dir->nr; i++) {
|
|
struct ref_entry *entry = dir->entries[i];
|
|
int retval;
|
|
if (entry->flag & REF_DIR) {
|
|
struct ref_dir *subdir = get_ref_dir(entry);
|
|
sort_ref_dir(subdir);
|
|
retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data);
|
|
} else {
|
|
retval = fn(entry, cb_data);
|
|
}
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the union of dir1 and dir2, in order
|
|
* by refname. Recurse into subdirectories. If a value entry appears
|
|
* in both dir1 and dir2, then only process the version that is in
|
|
* dir2. The input dirs must already be sorted, but subdirs will be
|
|
* sorted as needed. fn is called for all references, including
|
|
* broken ones.
|
|
*/
|
|
static int do_for_each_entry_in_dirs(struct ref_dir *dir1,
|
|
struct ref_dir *dir2,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
int retval;
|
|
int i1 = 0, i2 = 0;
|
|
|
|
assert(dir1->sorted == dir1->nr);
|
|
assert(dir2->sorted == dir2->nr);
|
|
while (1) {
|
|
struct ref_entry *e1, *e2;
|
|
int cmp;
|
|
if (i1 == dir1->nr) {
|
|
return do_for_each_entry_in_dir(dir2, i2, fn, cb_data);
|
|
}
|
|
if (i2 == dir2->nr) {
|
|
return do_for_each_entry_in_dir(dir1, i1, fn, cb_data);
|
|
}
|
|
e1 = dir1->entries[i1];
|
|
e2 = dir2->entries[i2];
|
|
cmp = strcmp(e1->name, e2->name);
|
|
if (cmp == 0) {
|
|
if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
|
|
/* Both are directories; descend them in parallel. */
|
|
struct ref_dir *subdir1 = get_ref_dir(e1);
|
|
struct ref_dir *subdir2 = get_ref_dir(e2);
|
|
sort_ref_dir(subdir1);
|
|
sort_ref_dir(subdir2);
|
|
retval = do_for_each_entry_in_dirs(
|
|
subdir1, subdir2, fn, cb_data);
|
|
i1++;
|
|
i2++;
|
|
} else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) {
|
|
/* Both are references; ignore the one from dir1. */
|
|
retval = fn(e2, cb_data);
|
|
i1++;
|
|
i2++;
|
|
} else {
|
|
die("conflict between reference and directory: %s",
|
|
e1->name);
|
|
}
|
|
} else {
|
|
struct ref_entry *e;
|
|
if (cmp < 0) {
|
|
e = e1;
|
|
i1++;
|
|
} else {
|
|
e = e2;
|
|
i2++;
|
|
}
|
|
if (e->flag & REF_DIR) {
|
|
struct ref_dir *subdir = get_ref_dir(e);
|
|
sort_ref_dir(subdir);
|
|
retval = do_for_each_entry_in_dir(
|
|
subdir, 0, fn, cb_data);
|
|
} else {
|
|
retval = fn(e, cb_data);
|
|
}
|
|
}
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Load all of the refs from the dir into our in-memory cache. The hard work
|
|
* of loading loose refs is done by get_ref_dir(), so we just need to recurse
|
|
* through all of the sub-directories. We do not even need to care about
|
|
* sorting, as traversal order does not matter to us.
|
|
*/
|
|
static void prime_ref_dir(struct ref_dir *dir)
|
|
{
|
|
int i;
|
|
for (i = 0; i < dir->nr; i++) {
|
|
struct ref_entry *entry = dir->entries[i];
|
|
if (entry->flag & REF_DIR)
|
|
prime_ref_dir(get_ref_dir(entry));
|
|
}
|
|
}
|
|
/*
|
|
* Return true iff refname1 and refname2 conflict with each other.
|
|
* Two reference names conflict if one of them exactly matches the
|
|
* leading components of the other; e.g., "foo/bar" conflicts with
|
|
* both "foo" and with "foo/bar/baz" but not with "foo/bar" or
|
|
* "foo/barbados".
|
|
*/
|
|
static int names_conflict(const char *refname1, const char *refname2)
|
|
{
|
|
for (; *refname1 && *refname1 == *refname2; refname1++, refname2++)
|
|
;
|
|
return (*refname1 == '\0' && *refname2 == '/')
|
|
|| (*refname1 == '/' && *refname2 == '\0');
|
|
}
|
|
|
|
struct name_conflict_cb {
|
|
const char *refname;
|
|
const char *oldrefname;
|
|
const char *conflicting_refname;
|
|
};
|
|
|
|
static int name_conflict_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct name_conflict_cb *data = (struct name_conflict_cb *)cb_data;
|
|
if (data->oldrefname && !strcmp(data->oldrefname, entry->name))
|
|
return 0;
|
|
if (names_conflict(data->refname, entry->name)) {
|
|
data->conflicting_refname = entry->name;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return true iff a reference named refname could be created without
|
|
* conflicting with the name of an existing reference in dir. If
|
|
* oldrefname is non-NULL, ignore potential conflicts with oldrefname
|
|
* (e.g., because oldrefname is scheduled for deletion in the same
|
|
* operation).
|
|
*/
|
|
static int is_refname_available(const char *refname, const char *oldrefname,
|
|
struct ref_dir *dir)
|
|
{
|
|
struct name_conflict_cb data;
|
|
data.refname = refname;
|
|
data.oldrefname = oldrefname;
|
|
data.conflicting_refname = NULL;
|
|
|
|
sort_ref_dir(dir);
|
|
if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) {
|
|
error("'%s' exists; cannot create '%s'",
|
|
data.conflicting_refname, refname);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
struct packed_ref_cache {
|
|
struct ref_entry *root;
|
|
|
|
/*
|
|
* Count of references to the data structure in this instance,
|
|
* including the pointer from ref_cache::packed if any. The
|
|
* data will not be freed as long as the reference count is
|
|
* nonzero.
|
|
*/
|
|
unsigned int referrers;
|
|
|
|
/*
|
|
* Iff the packed-refs file associated with this instance is
|
|
* currently locked for writing, this points at the associated
|
|
* lock (which is owned by somebody else). The referrer count
|
|
* is also incremented when the file is locked and decremented
|
|
* when it is unlocked.
|
|
*/
|
|
struct lock_file *lock;
|
|
|
|
/* The metadata from when this packed-refs cache was read */
|
|
struct stat_validity validity;
|
|
};
|
|
|
|
/*
|
|
* Future: need to be in "struct repository"
|
|
* when doing a full libification.
|
|
*/
|
|
static struct ref_cache {
|
|
struct ref_cache *next;
|
|
struct ref_entry *loose;
|
|
struct packed_ref_cache *packed;
|
|
/*
|
|
* The submodule name, or "" for the main repo. We allocate
|
|
* length 1 rather than FLEX_ARRAY so that the main ref_cache
|
|
* is initialized correctly.
|
|
*/
|
|
char name[1];
|
|
} ref_cache, *submodule_ref_caches;
|
|
|
|
/* Lock used for the main packed-refs file: */
|
|
static struct lock_file packlock;
|
|
|
|
/*
|
|
* Increment the reference count of *packed_refs.
|
|
*/
|
|
static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
|
|
{
|
|
packed_refs->referrers++;
|
|
}
|
|
|
|
/*
|
|
* Decrease the reference count of *packed_refs. If it goes to zero,
|
|
* free *packed_refs and return true; otherwise return false.
|
|
*/
|
|
static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
|
|
{
|
|
if (!--packed_refs->referrers) {
|
|
free_ref_entry(packed_refs->root);
|
|
stat_validity_clear(&packed_refs->validity);
|
|
free(packed_refs);
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void clear_packed_ref_cache(struct ref_cache *refs)
|
|
{
|
|
if (refs->packed) {
|
|
struct packed_ref_cache *packed_refs = refs->packed;
|
|
|
|
if (packed_refs->lock)
|
|
die("internal error: packed-ref cache cleared while locked");
|
|
refs->packed = NULL;
|
|
release_packed_ref_cache(packed_refs);
|
|
}
|
|
}
|
|
|
|
static void clear_loose_ref_cache(struct ref_cache *refs)
|
|
{
|
|
if (refs->loose) {
|
|
free_ref_entry(refs->loose);
|
|
refs->loose = NULL;
|
|
}
|
|
}
|
|
|
|
static struct ref_cache *create_ref_cache(const char *submodule)
|
|
{
|
|
int len;
|
|
struct ref_cache *refs;
|
|
if (!submodule)
|
|
submodule = "";
|
|
len = strlen(submodule) + 1;
|
|
refs = xcalloc(1, sizeof(struct ref_cache) + len);
|
|
memcpy(refs->name, submodule, len);
|
|
return refs;
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to a ref_cache for the specified submodule. For
|
|
* the main repository, use submodule==NULL. The returned structure
|
|
* will be allocated and initialized but not necessarily populated; it
|
|
* should not be freed.
|
|
*/
|
|
static struct ref_cache *get_ref_cache(const char *submodule)
|
|
{
|
|
struct ref_cache *refs;
|
|
|
|
if (!submodule || !*submodule)
|
|
return &ref_cache;
|
|
|
|
for (refs = submodule_ref_caches; refs; refs = refs->next)
|
|
if (!strcmp(submodule, refs->name))
|
|
return refs;
|
|
|
|
refs = create_ref_cache(submodule);
|
|
refs->next = submodule_ref_caches;
|
|
submodule_ref_caches = refs;
|
|
return refs;
|
|
}
|
|
|
|
void invalidate_ref_cache(const char *submodule)
|
|
{
|
|
struct ref_cache *refs = get_ref_cache(submodule);
|
|
clear_packed_ref_cache(refs);
|
|
clear_loose_ref_cache(refs);
|
|
}
|
|
|
|
/* The length of a peeled reference line in packed-refs, including EOL: */
|
|
#define PEELED_LINE_LENGTH 42
|
|
|
|
/*
|
|
* The packed-refs header line that we write out. Perhaps other
|
|
* traits will be added later. The trailing space is required.
|
|
*/
|
|
static const char PACKED_REFS_HEADER[] =
|
|
"# pack-refs with: peeled fully-peeled \n";
|
|
|
|
/*
|
|
* Parse one line from a packed-refs file. Write the SHA1 to sha1.
|
|
* Return a pointer to the refname within the line (null-terminated),
|
|
* or NULL if there was a problem.
|
|
*/
|
|
static const char *parse_ref_line(char *line, unsigned char *sha1)
|
|
{
|
|
/*
|
|
* 42: the answer to everything.
|
|
*
|
|
* In this case, it happens to be the answer to
|
|
* 40 (length of sha1 hex representation)
|
|
* +1 (space in between hex and name)
|
|
* +1 (newline at the end of the line)
|
|
*/
|
|
int len = strlen(line) - 42;
|
|
|
|
if (len <= 0)
|
|
return NULL;
|
|
if (get_sha1_hex(line, sha1) < 0)
|
|
return NULL;
|
|
if (!isspace(line[40]))
|
|
return NULL;
|
|
line += 41;
|
|
if (isspace(*line))
|
|
return NULL;
|
|
if (line[len] != '\n')
|
|
return NULL;
|
|
line[len] = 0;
|
|
|
|
return line;
|
|
}
|
|
|
|
/*
|
|
* Read f, which is a packed-refs file, into dir.
|
|
*
|
|
* A comment line of the form "# pack-refs with: " may contain zero or
|
|
* more traits. We interpret the traits as follows:
|
|
*
|
|
* No traits:
|
|
*
|
|
* Probably no references are peeled. But if the file contains a
|
|
* peeled value for a reference, we will use it.
|
|
*
|
|
* peeled:
|
|
*
|
|
* References under "refs/tags/", if they *can* be peeled, *are*
|
|
* peeled in this file. References outside of "refs/tags/" are
|
|
* probably not peeled even if they could have been, but if we find
|
|
* a peeled value for such a reference we will use it.
|
|
*
|
|
* fully-peeled:
|
|
*
|
|
* All references in the file that can be peeled are peeled.
|
|
* Inversely (and this is more important), any references in the
|
|
* file for which no peeled value is recorded is not peelable. This
|
|
* trait should typically be written alongside "peeled" for
|
|
* compatibility with older clients, but we do not require it
|
|
* (i.e., "peeled" is a no-op if "fully-peeled" is set).
|
|
*/
|
|
static void read_packed_refs(FILE *f, struct ref_dir *dir)
|
|
{
|
|
struct ref_entry *last = NULL;
|
|
char refline[PATH_MAX];
|
|
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
|
|
|
|
while (fgets(refline, sizeof(refline), f)) {
|
|
unsigned char sha1[20];
|
|
const char *refname;
|
|
static const char header[] = "# pack-refs with:";
|
|
|
|
if (!strncmp(refline, header, sizeof(header)-1)) {
|
|
const char *traits = refline + sizeof(header) - 1;
|
|
if (strstr(traits, " fully-peeled "))
|
|
peeled = PEELED_FULLY;
|
|
else if (strstr(traits, " peeled "))
|
|
peeled = PEELED_TAGS;
|
|
/* perhaps other traits later as well */
|
|
continue;
|
|
}
|
|
|
|
refname = parse_ref_line(refline, sha1);
|
|
if (refname) {
|
|
last = create_ref_entry(refname, sha1, REF_ISPACKED, 1);
|
|
if (peeled == PEELED_FULLY ||
|
|
(peeled == PEELED_TAGS && !prefixcmp(refname, "refs/tags/")))
|
|
last->flag |= REF_KNOWS_PEELED;
|
|
add_ref(dir, last);
|
|
continue;
|
|
}
|
|
if (last &&
|
|
refline[0] == '^' &&
|
|
strlen(refline) == PEELED_LINE_LENGTH &&
|
|
refline[PEELED_LINE_LENGTH - 1] == '\n' &&
|
|
!get_sha1_hex(refline + 1, sha1)) {
|
|
hashcpy(last->u.value.peeled, sha1);
|
|
/*
|
|
* Regardless of what the file header said,
|
|
* we definitely know the value of *this*
|
|
* reference:
|
|
*/
|
|
last->flag |= REF_KNOWS_PEELED;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the packed_ref_cache for the specified ref_cache, creating it
|
|
* if necessary.
|
|
*/
|
|
static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
|
|
{
|
|
const char *packed_refs_file;
|
|
|
|
if (*refs->name)
|
|
packed_refs_file = git_path_submodule(refs->name, "packed-refs");
|
|
else
|
|
packed_refs_file = git_path("packed-refs");
|
|
|
|
if (refs->packed &&
|
|
!stat_validity_check(&refs->packed->validity, packed_refs_file))
|
|
clear_packed_ref_cache(refs);
|
|
|
|
if (!refs->packed) {
|
|
FILE *f;
|
|
|
|
refs->packed = xcalloc(1, sizeof(*refs->packed));
|
|
acquire_packed_ref_cache(refs->packed);
|
|
refs->packed->root = create_dir_entry(refs, "", 0, 0);
|
|
f = fopen(packed_refs_file, "r");
|
|
if (f) {
|
|
stat_validity_update(&refs->packed->validity, fileno(f));
|
|
read_packed_refs(f, get_ref_dir(refs->packed->root));
|
|
fclose(f);
|
|
}
|
|
}
|
|
return refs->packed;
|
|
}
|
|
|
|
static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
|
|
{
|
|
return get_ref_dir(packed_ref_cache->root);
|
|
}
|
|
|
|
static struct ref_dir *get_packed_refs(struct ref_cache *refs)
|
|
{
|
|
return get_packed_ref_dir(get_packed_ref_cache(refs));
|
|
}
|
|
|
|
void add_packed_ref(const char *refname, const unsigned char *sha1)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed refs not locked");
|
|
add_ref(get_packed_ref_dir(packed_ref_cache),
|
|
create_ref_entry(refname, sha1, REF_ISPACKED, 1));
|
|
}
|
|
|
|
/*
|
|
* Read the loose references from the namespace dirname into dir
|
|
* (without recursing). dirname must end with '/'. dir must be the
|
|
* directory entry corresponding to dirname.
|
|
*/
|
|
static void read_loose_refs(const char *dirname, struct ref_dir *dir)
|
|
{
|
|
struct ref_cache *refs = dir->ref_cache;
|
|
DIR *d;
|
|
const char *path;
|
|
struct dirent *de;
|
|
int dirnamelen = strlen(dirname);
|
|
struct strbuf refname;
|
|
|
|
if (*refs->name)
|
|
path = git_path_submodule(refs->name, "%s", dirname);
|
|
else
|
|
path = git_path("%s", dirname);
|
|
|
|
d = opendir(path);
|
|
if (!d)
|
|
return;
|
|
|
|
strbuf_init(&refname, dirnamelen + 257);
|
|
strbuf_add(&refname, dirname, dirnamelen);
|
|
|
|
while ((de = readdir(d)) != NULL) {
|
|
unsigned char sha1[20];
|
|
struct stat st;
|
|
int flag;
|
|
const char *refdir;
|
|
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
if (has_extension(de->d_name, ".lock"))
|
|
continue;
|
|
strbuf_addstr(&refname, de->d_name);
|
|
refdir = *refs->name
|
|
? git_path_submodule(refs->name, "%s", refname.buf)
|
|
: git_path("%s", refname.buf);
|
|
if (stat(refdir, &st) < 0) {
|
|
; /* silently ignore */
|
|
} else if (S_ISDIR(st.st_mode)) {
|
|
strbuf_addch(&refname, '/');
|
|
add_entry_to_dir(dir,
|
|
create_dir_entry(refs, refname.buf,
|
|
refname.len, 1));
|
|
} else {
|
|
if (*refs->name) {
|
|
hashclr(sha1);
|
|
flag = 0;
|
|
if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) {
|
|
hashclr(sha1);
|
|
flag |= REF_ISBROKEN;
|
|
}
|
|
} else if (read_ref_full(refname.buf, sha1, 1, &flag)) {
|
|
hashclr(sha1);
|
|
flag |= REF_ISBROKEN;
|
|
}
|
|
add_entry_to_dir(dir,
|
|
create_ref_entry(refname.buf, sha1, flag, 1));
|
|
}
|
|
strbuf_setlen(&refname, dirnamelen);
|
|
}
|
|
strbuf_release(&refname);
|
|
closedir(d);
|
|
}
|
|
|
|
static struct ref_dir *get_loose_refs(struct ref_cache *refs)
|
|
{
|
|
if (!refs->loose) {
|
|
/*
|
|
* Mark the top-level directory complete because we
|
|
* are about to read the only subdirectory that can
|
|
* hold references:
|
|
*/
|
|
refs->loose = create_dir_entry(refs, "", 0, 0);
|
|
/*
|
|
* Create an incomplete entry for "refs/":
|
|
*/
|
|
add_entry_to_dir(get_ref_dir(refs->loose),
|
|
create_dir_entry(refs, "refs/", 5, 1));
|
|
}
|
|
return get_ref_dir(refs->loose);
|
|
}
|
|
|
|
/* We allow "recursive" symbolic refs. Only within reason, though */
|
|
#define MAXDEPTH 5
|
|
#define MAXREFLEN (1024)
|
|
|
|
/*
|
|
* Called by resolve_gitlink_ref_recursive() after it failed to read
|
|
* from the loose refs in ref_cache refs. Find <refname> in the
|
|
* packed-refs file for the submodule.
|
|
*/
|
|
static int resolve_gitlink_packed_ref(struct ref_cache *refs,
|
|
const char *refname, unsigned char *sha1)
|
|
{
|
|
struct ref_entry *ref;
|
|
struct ref_dir *dir = get_packed_refs(refs);
|
|
|
|
ref = find_ref(dir, refname);
|
|
if (ref == NULL)
|
|
return -1;
|
|
|
|
memcpy(sha1, ref->u.value.sha1, 20);
|
|
return 0;
|
|
}
|
|
|
|
static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
|
|
const char *refname, unsigned char *sha1,
|
|
int recursion)
|
|
{
|
|
int fd, len;
|
|
char buffer[128], *p;
|
|
char *path;
|
|
|
|
if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
|
|
return -1;
|
|
path = *refs->name
|
|
? git_path_submodule(refs->name, "%s", refname)
|
|
: git_path("%s", refname);
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return resolve_gitlink_packed_ref(refs, refname, sha1);
|
|
|
|
len = read(fd, buffer, sizeof(buffer)-1);
|
|
close(fd);
|
|
if (len < 0)
|
|
return -1;
|
|
while (len && isspace(buffer[len-1]))
|
|
len--;
|
|
buffer[len] = 0;
|
|
|
|
/* Was it a detached head or an old-fashioned symlink? */
|
|
if (!get_sha1_hex(buffer, sha1))
|
|
return 0;
|
|
|
|
/* Symref? */
|
|
if (strncmp(buffer, "ref:", 4))
|
|
return -1;
|
|
p = buffer + 4;
|
|
while (isspace(*p))
|
|
p++;
|
|
|
|
return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
|
|
}
|
|
|
|
int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
|
|
{
|
|
int len = strlen(path), retval;
|
|
char *submodule;
|
|
struct ref_cache *refs;
|
|
|
|
while (len && path[len-1] == '/')
|
|
len--;
|
|
if (!len)
|
|
return -1;
|
|
submodule = xstrndup(path, len);
|
|
refs = get_ref_cache(submodule);
|
|
free(submodule);
|
|
|
|
retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Return the ref_entry for the given refname from the packed
|
|
* references. If it does not exist, return NULL.
|
|
*/
|
|
static struct ref_entry *get_packed_ref(const char *refname)
|
|
{
|
|
return find_ref(get_packed_refs(&ref_cache), refname);
|
|
}
|
|
|
|
/*
|
|
* A loose ref file doesn't exist; check for a packed ref. The
|
|
* options are forwarded from resolve_safe_unsafe().
|
|
*/
|
|
static const char *handle_missing_loose_ref(const char *refname,
|
|
unsigned char *sha1,
|
|
int reading,
|
|
int *flag)
|
|
{
|
|
struct ref_entry *entry;
|
|
|
|
/*
|
|
* The loose reference file does not exist; check for a packed
|
|
* reference.
|
|
*/
|
|
entry = get_packed_ref(refname);
|
|
if (entry) {
|
|
hashcpy(sha1, entry->u.value.sha1);
|
|
if (flag)
|
|
*flag |= REF_ISPACKED;
|
|
return refname;
|
|
}
|
|
/* The reference is not a packed reference, either. */
|
|
if (reading) {
|
|
return NULL;
|
|
} else {
|
|
hashclr(sha1);
|
|
return refname;
|
|
}
|
|
}
|
|
|
|
const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
|
|
{
|
|
int depth = MAXDEPTH;
|
|
ssize_t len;
|
|
char buffer[256];
|
|
static char refname_buffer[256];
|
|
|
|
if (flag)
|
|
*flag = 0;
|
|
|
|
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
|
|
return NULL;
|
|
|
|
for (;;) {
|
|
char path[PATH_MAX];
|
|
struct stat st;
|
|
char *buf;
|
|
int fd;
|
|
|
|
if (--depth < 0)
|
|
return NULL;
|
|
|
|
git_snpath(path, sizeof(path), "%s", refname);
|
|
|
|
/*
|
|
* We might have to loop back here to avoid a race
|
|
* condition: first we lstat() the file, then we try
|
|
* to read it as a link or as a file. But if somebody
|
|
* changes the type of the file (file <-> directory
|
|
* <-> symlink) between the lstat() and reading, then
|
|
* we don't want to report that as an error but rather
|
|
* try again starting with the lstat().
|
|
*/
|
|
stat_ref:
|
|
if (lstat(path, &st) < 0) {
|
|
if (errno == ENOENT)
|
|
return handle_missing_loose_ref(refname, sha1,
|
|
reading, flag);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* Follow "normalized" - ie "refs/.." symlinks by hand */
|
|
if (S_ISLNK(st.st_mode)) {
|
|
len = readlink(path, buffer, sizeof(buffer)-1);
|
|
if (len < 0) {
|
|
if (errno == ENOENT || errno == EINVAL)
|
|
/* inconsistent with lstat; retry */
|
|
goto stat_ref;
|
|
else
|
|
return NULL;
|
|
}
|
|
buffer[len] = 0;
|
|
if (!prefixcmp(buffer, "refs/") &&
|
|
!check_refname_format(buffer, 0)) {
|
|
strcpy(refname_buffer, buffer);
|
|
refname = refname_buffer;
|
|
if (flag)
|
|
*flag |= REF_ISSYMREF;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Is it a directory? */
|
|
if (S_ISDIR(st.st_mode)) {
|
|
errno = EISDIR;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Anything else, just open it and try to use it as
|
|
* a ref
|
|
*/
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
if (errno == ENOENT)
|
|
/* inconsistent with lstat; retry */
|
|
goto stat_ref;
|
|
else
|
|
return NULL;
|
|
}
|
|
len = read_in_full(fd, buffer, sizeof(buffer)-1);
|
|
close(fd);
|
|
if (len < 0)
|
|
return NULL;
|
|
while (len && isspace(buffer[len-1]))
|
|
len--;
|
|
buffer[len] = '\0';
|
|
|
|
/*
|
|
* Is it a symbolic ref?
|
|
*/
|
|
if (prefixcmp(buffer, "ref:")) {
|
|
/*
|
|
* Please note that FETCH_HEAD has a second
|
|
* line containing other data.
|
|
*/
|
|
if (get_sha1_hex(buffer, sha1) ||
|
|
(buffer[40] != '\0' && !isspace(buffer[40]))) {
|
|
if (flag)
|
|
*flag |= REF_ISBROKEN;
|
|
return NULL;
|
|
}
|
|
return refname;
|
|
}
|
|
if (flag)
|
|
*flag |= REF_ISSYMREF;
|
|
buf = buffer + 4;
|
|
while (isspace(*buf))
|
|
buf++;
|
|
if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
|
|
if (flag)
|
|
*flag |= REF_ISBROKEN;
|
|
return NULL;
|
|
}
|
|
refname = strcpy(refname_buffer, buf);
|
|
}
|
|
}
|
|
|
|
char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
|
|
{
|
|
const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
|
|
return ret ? xstrdup(ret) : NULL;
|
|
}
|
|
|
|
/* The argument to filter_refs */
|
|
struct ref_filter {
|
|
const char *pattern;
|
|
each_ref_fn *fn;
|
|
void *cb_data;
|
|
};
|
|
|
|
int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
|
|
{
|
|
if (resolve_ref_unsafe(refname, sha1, reading, flags))
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
int read_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
return read_ref_full(refname, sha1, 1, NULL);
|
|
}
|
|
|
|
int ref_exists(const char *refname)
|
|
{
|
|
unsigned char sha1[20];
|
|
return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
|
|
}
|
|
|
|
static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
|
|
void *data)
|
|
{
|
|
struct ref_filter *filter = (struct ref_filter *)data;
|
|
if (fnmatch(filter->pattern, refname, 0))
|
|
return 0;
|
|
return filter->fn(refname, sha1, flags, filter->cb_data);
|
|
}
|
|
|
|
enum peel_status {
|
|
/* object was peeled successfully: */
|
|
PEEL_PEELED = 0,
|
|
|
|
/*
|
|
* object cannot be peeled because the named object (or an
|
|
* object referred to by a tag in the peel chain), does not
|
|
* exist.
|
|
*/
|
|
PEEL_INVALID = -1,
|
|
|
|
/* object cannot be peeled because it is not a tag: */
|
|
PEEL_NON_TAG = -2,
|
|
|
|
/* ref_entry contains no peeled value because it is a symref: */
|
|
PEEL_IS_SYMREF = -3,
|
|
|
|
/*
|
|
* ref_entry cannot be peeled because it is broken (i.e., the
|
|
* symbolic reference cannot even be resolved to an object
|
|
* name):
|
|
*/
|
|
PEEL_BROKEN = -4
|
|
};
|
|
|
|
/*
|
|
* Peel the named object; i.e., if the object is a tag, resolve the
|
|
* tag recursively until a non-tag is found. If successful, store the
|
|
* result to sha1 and return PEEL_PEELED. If the object is not a tag
|
|
* or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively,
|
|
* and leave sha1 unchanged.
|
|
*/
|
|
static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
|
|
{
|
|
struct object *o = lookup_unknown_object(name);
|
|
|
|
if (o->type == OBJ_NONE) {
|
|
int type = sha1_object_info(name, NULL);
|
|
if (type < 0)
|
|
return PEEL_INVALID;
|
|
o->type = type;
|
|
}
|
|
|
|
if (o->type != OBJ_TAG)
|
|
return PEEL_NON_TAG;
|
|
|
|
o = deref_tag_noverify(o);
|
|
if (!o)
|
|
return PEEL_INVALID;
|
|
|
|
hashcpy(sha1, o->sha1);
|
|
return PEEL_PEELED;
|
|
}
|
|
|
|
/*
|
|
* Peel the entry (if possible) and return its new peel_status. If
|
|
* repeel is true, re-peel the entry even if there is an old peeled
|
|
* value that is already stored in it.
|
|
*
|
|
* It is OK to call this function with a packed reference entry that
|
|
* might be stale and might even refer to an object that has since
|
|
* been garbage-collected. In such a case, if the entry has
|
|
* REF_KNOWS_PEELED then leave the status unchanged and return
|
|
* PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID.
|
|
*/
|
|
static enum peel_status peel_entry(struct ref_entry *entry, int repeel)
|
|
{
|
|
enum peel_status status;
|
|
|
|
if (entry->flag & REF_KNOWS_PEELED) {
|
|
if (repeel) {
|
|
entry->flag &= ~REF_KNOWS_PEELED;
|
|
hashclr(entry->u.value.peeled);
|
|
} else {
|
|
return is_null_sha1(entry->u.value.peeled) ?
|
|
PEEL_NON_TAG : PEEL_PEELED;
|
|
}
|
|
}
|
|
if (entry->flag & REF_ISBROKEN)
|
|
return PEEL_BROKEN;
|
|
if (entry->flag & REF_ISSYMREF)
|
|
return PEEL_IS_SYMREF;
|
|
|
|
status = peel_object(entry->u.value.sha1, entry->u.value.peeled);
|
|
if (status == PEEL_PEELED || status == PEEL_NON_TAG)
|
|
entry->flag |= REF_KNOWS_PEELED;
|
|
return status;
|
|
}
|
|
|
|
int peel_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
int flag;
|
|
unsigned char base[20];
|
|
|
|
if (current_ref && (current_ref->name == refname
|
|
|| !strcmp(current_ref->name, refname))) {
|
|
if (peel_entry(current_ref, 0))
|
|
return -1;
|
|
hashcpy(sha1, current_ref->u.value.peeled);
|
|
return 0;
|
|
}
|
|
|
|
if (read_ref_full(refname, base, 1, &flag))
|
|
return -1;
|
|
|
|
/*
|
|
* If the reference is packed, read its ref_entry from the
|
|
* cache in the hope that we already know its peeled value.
|
|
* We only try this optimization on packed references because
|
|
* (a) forcing the filling of the loose reference cache could
|
|
* be expensive and (b) loose references anyway usually do not
|
|
* have REF_KNOWS_PEELED.
|
|
*/
|
|
if (flag & REF_ISPACKED) {
|
|
struct ref_entry *r = get_packed_ref(refname);
|
|
if (r) {
|
|
if (peel_entry(r, 0))
|
|
return -1;
|
|
hashcpy(sha1, r->u.value.peeled);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return peel_object(base, sha1);
|
|
}
|
|
|
|
struct warn_if_dangling_data {
|
|
FILE *fp;
|
|
const char *refname;
|
|
const char *msg_fmt;
|
|
};
|
|
|
|
static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
|
|
int flags, void *cb_data)
|
|
{
|
|
struct warn_if_dangling_data *d = cb_data;
|
|
const char *resolves_to;
|
|
unsigned char junk[20];
|
|
|
|
if (!(flags & REF_ISSYMREF))
|
|
return 0;
|
|
|
|
resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
|
|
if (!resolves_to || strcmp(resolves_to, d->refname))
|
|
return 0;
|
|
|
|
fprintf(d->fp, d->msg_fmt, refname);
|
|
fputc('\n', d->fp);
|
|
return 0;
|
|
}
|
|
|
|
void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
|
|
{
|
|
struct warn_if_dangling_data data;
|
|
|
|
data.fp = fp;
|
|
data.refname = refname;
|
|
data.msg_fmt = msg_fmt;
|
|
for_each_rawref(warn_if_dangling_symref, &data);
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the specified ref_cache, omitting
|
|
* references not in the containing_dir of base. fn is called for all
|
|
* references, including broken ones. If fn ever returns a non-zero
|
|
* value, stop the iteration and return that value; otherwise, return
|
|
* 0.
|
|
*/
|
|
static int do_for_each_entry(struct ref_cache *refs, const char *base,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache;
|
|
struct ref_dir *loose_dir;
|
|
struct ref_dir *packed_dir;
|
|
int retval = 0;
|
|
|
|
/*
|
|
* We must make sure that all loose refs are read before accessing the
|
|
* packed-refs file; this avoids a race condition in which loose refs
|
|
* are migrated to the packed-refs file by a simultaneous process, but
|
|
* our in-memory view is from before the migration. get_packed_ref_cache()
|
|
* takes care of making sure our view is up to date with what is on
|
|
* disk.
|
|
*/
|
|
loose_dir = get_loose_refs(refs);
|
|
if (base && *base) {
|
|
loose_dir = find_containing_dir(loose_dir, base, 0);
|
|
}
|
|
if (loose_dir)
|
|
prime_ref_dir(loose_dir);
|
|
|
|
packed_ref_cache = get_packed_ref_cache(refs);
|
|
acquire_packed_ref_cache(packed_ref_cache);
|
|
packed_dir = get_packed_ref_dir(packed_ref_cache);
|
|
if (base && *base) {
|
|
packed_dir = find_containing_dir(packed_dir, base, 0);
|
|
}
|
|
|
|
if (packed_dir && loose_dir) {
|
|
sort_ref_dir(packed_dir);
|
|
sort_ref_dir(loose_dir);
|
|
retval = do_for_each_entry_in_dirs(
|
|
packed_dir, loose_dir, fn, cb_data);
|
|
} else if (packed_dir) {
|
|
sort_ref_dir(packed_dir);
|
|
retval = do_for_each_entry_in_dir(
|
|
packed_dir, 0, fn, cb_data);
|
|
} else if (loose_dir) {
|
|
sort_ref_dir(loose_dir);
|
|
retval = do_for_each_entry_in_dir(
|
|
loose_dir, 0, fn, cb_data);
|
|
}
|
|
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the specified ref_cache for which the
|
|
* refname begins with base. If trim is non-zero, then trim that many
|
|
* characters off the beginning of each refname before passing the
|
|
* refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include
|
|
* broken references in the iteration. If fn ever returns a non-zero
|
|
* value, stop the iteration and return that value; otherwise, return
|
|
* 0.
|
|
*/
|
|
static int do_for_each_ref(struct ref_cache *refs, const char *base,
|
|
each_ref_fn fn, int trim, int flags, void *cb_data)
|
|
{
|
|
struct ref_entry_cb data;
|
|
data.base = base;
|
|
data.trim = trim;
|
|
data.flags = flags;
|
|
data.fn = fn;
|
|
data.cb_data = cb_data;
|
|
|
|
return do_for_each_entry(refs, base, do_one_ref, &data);
|
|
}
|
|
|
|
static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
unsigned char sha1[20];
|
|
int flag;
|
|
|
|
if (submodule) {
|
|
if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
|
|
return fn("HEAD", sha1, 0, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!read_ref_full("HEAD", sha1, 1, &flag))
|
|
return fn("HEAD", sha1, flag, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int head_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(NULL, fn, cb_data);
|
|
}
|
|
|
|
int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(submodule, fn, cb_data);
|
|
}
|
|
|
|
int for_each_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in_submodule(const char *submodule, const char *prefix,
|
|
each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_tag_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/tags/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_branch_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/heads/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_remote_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/remotes/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_replace_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data);
|
|
}
|
|
|
|
int head_ref_namespaced(each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret = 0;
|
|
unsigned char sha1[20];
|
|
int flag;
|
|
|
|
strbuf_addf(&buf, "%sHEAD", get_git_namespace());
|
|
if (!read_ref_full(buf.buf, sha1, 1, &flag))
|
|
ret = fn(buf.buf, sha1, flag, cb_data);
|
|
strbuf_release(&buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret;
|
|
strbuf_addf(&buf, "%srefs/", get_git_namespace());
|
|
ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
|
|
const char *prefix, void *cb_data)
|
|
{
|
|
struct strbuf real_pattern = STRBUF_INIT;
|
|
struct ref_filter filter;
|
|
int ret;
|
|
|
|
if (!prefix && prefixcmp(pattern, "refs/"))
|
|
strbuf_addstr(&real_pattern, "refs/");
|
|
else if (prefix)
|
|
strbuf_addstr(&real_pattern, prefix);
|
|
strbuf_addstr(&real_pattern, pattern);
|
|
|
|
if (!has_glob_specials(pattern)) {
|
|
/* Append implied '/' '*' if not present. */
|
|
if (real_pattern.buf[real_pattern.len - 1] != '/')
|
|
strbuf_addch(&real_pattern, '/');
|
|
/* No need to check for '*', there is none. */
|
|
strbuf_addch(&real_pattern, '*');
|
|
}
|
|
|
|
filter.pattern = real_pattern.buf;
|
|
filter.fn = fn;
|
|
filter.cb_data = cb_data;
|
|
ret = for_each_ref(filter_refs, &filter);
|
|
|
|
strbuf_release(&real_pattern);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
|
|
{
|
|
return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
|
|
}
|
|
|
|
int for_each_rawref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, "", fn, 0,
|
|
DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
|
|
}
|
|
|
|
const char *prettify_refname(const char *name)
|
|
{
|
|
return name + (
|
|
!prefixcmp(name, "refs/heads/") ? 11 :
|
|
!prefixcmp(name, "refs/tags/") ? 10 :
|
|
!prefixcmp(name, "refs/remotes/") ? 13 :
|
|
0);
|
|
}
|
|
|
|
const char *ref_rev_parse_rules[] = {
|
|
"%.*s",
|
|
"refs/%.*s",
|
|
"refs/tags/%.*s",
|
|
"refs/heads/%.*s",
|
|
"refs/remotes/%.*s",
|
|
"refs/remotes/%.*s/HEAD",
|
|
NULL
|
|
};
|
|
|
|
int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
|
|
{
|
|
const char **p;
|
|
const int abbrev_name_len = strlen(abbrev_name);
|
|
|
|
for (p = rules; *p; p++) {
|
|
if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ref_lock *verify_lock(struct ref_lock *lock,
|
|
const unsigned char *old_sha1, int mustexist)
|
|
{
|
|
if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
|
|
error("Can't verify ref %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return NULL;
|
|
}
|
|
if (hashcmp(lock->old_sha1, old_sha1)) {
|
|
error("Ref %s is at %s but expected %s", lock->ref_name,
|
|
sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
|
|
unlock_ref(lock);
|
|
return NULL;
|
|
}
|
|
return lock;
|
|
}
|
|
|
|
static int remove_empty_directories(const char *file)
|
|
{
|
|
/* we want to create a file but there is a directory there;
|
|
* if that is an empty directory (or a directory that contains
|
|
* only empty directories), remove them.
|
|
*/
|
|
struct strbuf path;
|
|
int result;
|
|
|
|
strbuf_init(&path, 20);
|
|
strbuf_addstr(&path, file);
|
|
|
|
result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
|
|
|
|
strbuf_release(&path);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* *string and *len will only be substituted, and *string returned (for
|
|
* later free()ing) if the string passed in is a magic short-hand form
|
|
* to name a branch.
|
|
*/
|
|
static char *substitute_branch_name(const char **string, int *len)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret = interpret_branch_name(*string, &buf);
|
|
|
|
if (ret == *len) {
|
|
size_t size;
|
|
*string = strbuf_detach(&buf, &size);
|
|
*len = size;
|
|
return (char *)*string;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
|
|
{
|
|
char *last_branch = substitute_branch_name(&str, &len);
|
|
const char **p, *r;
|
|
int refs_found = 0;
|
|
|
|
*ref = NULL;
|
|
for (p = ref_rev_parse_rules; *p; p++) {
|
|
char fullref[PATH_MAX];
|
|
unsigned char sha1_from_ref[20];
|
|
unsigned char *this_result;
|
|
int flag;
|
|
|
|
this_result = refs_found ? sha1_from_ref : sha1;
|
|
mksnpath(fullref, sizeof(fullref), *p, len, str);
|
|
r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
|
|
if (r) {
|
|
if (!refs_found++)
|
|
*ref = xstrdup(r);
|
|
if (!warn_ambiguous_refs)
|
|
break;
|
|
} else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
|
|
warning("ignoring dangling symref %s.", fullref);
|
|
} else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
|
|
warning("ignoring broken ref %s.", fullref);
|
|
}
|
|
}
|
|
free(last_branch);
|
|
return refs_found;
|
|
}
|
|
|
|
int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
|
|
{
|
|
char *last_branch = substitute_branch_name(&str, &len);
|
|
const char **p;
|
|
int logs_found = 0;
|
|
|
|
*log = NULL;
|
|
for (p = ref_rev_parse_rules; *p; p++) {
|
|
struct stat st;
|
|
unsigned char hash[20];
|
|
char path[PATH_MAX];
|
|
const char *ref, *it;
|
|
|
|
mksnpath(path, sizeof(path), *p, len, str);
|
|
ref = resolve_ref_unsafe(path, hash, 1, NULL);
|
|
if (!ref)
|
|
continue;
|
|
if (!stat(git_path("logs/%s", path), &st) &&
|
|
S_ISREG(st.st_mode))
|
|
it = path;
|
|
else if (strcmp(ref, path) &&
|
|
!stat(git_path("logs/%s", ref), &st) &&
|
|
S_ISREG(st.st_mode))
|
|
it = ref;
|
|
else
|
|
continue;
|
|
if (!logs_found++) {
|
|
*log = xstrdup(it);
|
|
hashcpy(sha1, hash);
|
|
}
|
|
if (!warn_ambiguous_refs)
|
|
break;
|
|
}
|
|
free(last_branch);
|
|
return logs_found;
|
|
}
|
|
|
|
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
|
|
const unsigned char *old_sha1,
|
|
int flags, int *type_p)
|
|
{
|
|
char *ref_file;
|
|
const char *orig_refname = refname;
|
|
struct ref_lock *lock;
|
|
int last_errno = 0;
|
|
int type, lflags;
|
|
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
|
|
int missing = 0;
|
|
|
|
lock = xcalloc(1, sizeof(struct ref_lock));
|
|
lock->lock_fd = -1;
|
|
|
|
refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
|
|
if (!refname && errno == EISDIR) {
|
|
/* we are trying to lock foo but we used to
|
|
* have foo/bar which now does not exist;
|
|
* it is normal for the empty directory 'foo'
|
|
* to remain.
|
|
*/
|
|
ref_file = git_path("%s", orig_refname);
|
|
if (remove_empty_directories(ref_file)) {
|
|
last_errno = errno;
|
|
error("there are still refs under '%s'", orig_refname);
|
|
goto error_return;
|
|
}
|
|
refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
|
|
}
|
|
if (type_p)
|
|
*type_p = type;
|
|
if (!refname) {
|
|
last_errno = errno;
|
|
error("unable to resolve reference %s: %s",
|
|
orig_refname, strerror(errno));
|
|
goto error_return;
|
|
}
|
|
missing = is_null_sha1(lock->old_sha1);
|
|
/* When the ref did not exist and we are creating it,
|
|
* make sure there is no existing ref that is packed
|
|
* whose name begins with our refname, nor a ref whose
|
|
* name is a proper prefix of our refname.
|
|
*/
|
|
if (missing &&
|
|
!is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) {
|
|
last_errno = ENOTDIR;
|
|
goto error_return;
|
|
}
|
|
|
|
lock->lk = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
lflags = LOCK_DIE_ON_ERROR;
|
|
if (flags & REF_NODEREF) {
|
|
refname = orig_refname;
|
|
lflags |= LOCK_NODEREF;
|
|
}
|
|
lock->ref_name = xstrdup(refname);
|
|
lock->orig_ref_name = xstrdup(orig_refname);
|
|
ref_file = git_path("%s", refname);
|
|
if (missing)
|
|
lock->force_write = 1;
|
|
if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
|
|
lock->force_write = 1;
|
|
|
|
if (safe_create_leading_directories(ref_file)) {
|
|
last_errno = errno;
|
|
error("unable to create directory for %s", ref_file);
|
|
goto error_return;
|
|
}
|
|
|
|
lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
|
|
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
|
|
|
|
error_return:
|
|
unlock_ref(lock);
|
|
errno = last_errno;
|
|
return NULL;
|
|
}
|
|
|
|
struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
|
|
{
|
|
char refpath[PATH_MAX];
|
|
if (check_refname_format(refname, 0))
|
|
return NULL;
|
|
strcpy(refpath, mkpath("refs/%s", refname));
|
|
return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
|
|
}
|
|
|
|
struct ref_lock *lock_any_ref_for_update(const char *refname,
|
|
const unsigned char *old_sha1, int flags)
|
|
{
|
|
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
|
|
return NULL;
|
|
return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
|
|
}
|
|
|
|
/*
|
|
* Write an entry to the packed-refs file for the specified refname.
|
|
* If peeled is non-NULL, write it as the entry's peeled value.
|
|
*/
|
|
static void write_packed_entry(int fd, char *refname, unsigned char *sha1,
|
|
unsigned char *peeled)
|
|
{
|
|
char line[PATH_MAX + 100];
|
|
int len;
|
|
|
|
len = snprintf(line, sizeof(line), "%s %s\n",
|
|
sha1_to_hex(sha1), refname);
|
|
/* this should not happen but just being defensive */
|
|
if (len > sizeof(line))
|
|
die("too long a refname '%s'", refname);
|
|
write_or_die(fd, line, len);
|
|
|
|
if (peeled) {
|
|
if (snprintf(line, sizeof(line), "^%s\n",
|
|
sha1_to_hex(peeled)) != PEELED_LINE_LENGTH)
|
|
die("internal error");
|
|
write_or_die(fd, line, PEELED_LINE_LENGTH);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* An each_ref_entry_fn that writes the entry to a packed-refs file.
|
|
*/
|
|
static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
int *fd = cb_data;
|
|
enum peel_status peel_status = peel_entry(entry, 0);
|
|
|
|
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
|
|
error("internal error: %s is not a valid packed reference!",
|
|
entry->name);
|
|
write_packed_entry(*fd, entry->name, entry->u.value.sha1,
|
|
peel_status == PEEL_PEELED ?
|
|
entry->u.value.peeled : NULL);
|
|
return 0;
|
|
}
|
|
|
|
int lock_packed_refs(int flags)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache;
|
|
|
|
/* Discard the old cache because it might be invalid: */
|
|
clear_packed_ref_cache(&ref_cache);
|
|
if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0)
|
|
return -1;
|
|
/* Read the current packed-refs while holding the lock: */
|
|
packed_ref_cache = get_packed_ref_cache(&ref_cache);
|
|
packed_ref_cache->lock = &packlock;
|
|
/* Increment the reference count to prevent it from being freed: */
|
|
acquire_packed_ref_cache(packed_ref_cache);
|
|
return 0;
|
|
}
|
|
|
|
int commit_packed_refs(void)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
int error = 0;
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed-refs not locked");
|
|
write_or_die(packed_ref_cache->lock->fd,
|
|
PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER));
|
|
|
|
do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
|
|
0, write_packed_entry_fn,
|
|
&packed_ref_cache->lock->fd);
|
|
if (commit_lock_file(packed_ref_cache->lock))
|
|
error = -1;
|
|
packed_ref_cache->lock = NULL;
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
return error;
|
|
}
|
|
|
|
void rollback_packed_refs(void)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed-refs not locked");
|
|
rollback_lock_file(packed_ref_cache->lock);
|
|
packed_ref_cache->lock = NULL;
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
clear_packed_ref_cache(&ref_cache);
|
|
}
|
|
|
|
struct ref_to_prune {
|
|
struct ref_to_prune *next;
|
|
unsigned char sha1[20];
|
|
char name[FLEX_ARRAY];
|
|
};
|
|
|
|
struct pack_refs_cb_data {
|
|
unsigned int flags;
|
|
struct ref_dir *packed_refs;
|
|
struct ref_to_prune *ref_to_prune;
|
|
};
|
|
|
|
/*
|
|
* An each_ref_entry_fn that is run over loose references only. If
|
|
* the loose reference can be packed, add an entry in the packed ref
|
|
* cache. If the reference should be pruned, also add it to
|
|
* ref_to_prune in the pack_refs_cb_data.
|
|
*/
|
|
static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct pack_refs_cb_data *cb = cb_data;
|
|
enum peel_status peel_status;
|
|
struct ref_entry *packed_entry;
|
|
int is_tag_ref = !prefixcmp(entry->name, "refs/tags/");
|
|
|
|
/* ALWAYS pack tags */
|
|
if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
|
|
return 0;
|
|
|
|
/* Do not pack symbolic or broken refs: */
|
|
if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
|
|
return 0;
|
|
|
|
/* Add a packed ref cache entry equivalent to the loose entry. */
|
|
peel_status = peel_entry(entry, 1);
|
|
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
|
|
die("internal error peeling reference %s (%s)",
|
|
entry->name, sha1_to_hex(entry->u.value.sha1));
|
|
packed_entry = find_ref(cb->packed_refs, entry->name);
|
|
if (packed_entry) {
|
|
/* Overwrite existing packed entry with info from loose entry */
|
|
packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
|
|
hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1);
|
|
} else {
|
|
packed_entry = create_ref_entry(entry->name, entry->u.value.sha1,
|
|
REF_ISPACKED | REF_KNOWS_PEELED, 0);
|
|
add_ref(cb->packed_refs, packed_entry);
|
|
}
|
|
hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled);
|
|
|
|
/* Schedule the loose reference for pruning if requested. */
|
|
if ((cb->flags & PACK_REFS_PRUNE)) {
|
|
int namelen = strlen(entry->name) + 1;
|
|
struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
|
|
hashcpy(n->sha1, entry->u.value.sha1);
|
|
strcpy(n->name, entry->name);
|
|
n->next = cb->ref_to_prune;
|
|
cb->ref_to_prune = n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove empty parents, but spare refs/ and immediate subdirs.
|
|
* Note: munges *name.
|
|
*/
|
|
static void try_remove_empty_parents(char *name)
|
|
{
|
|
char *p, *q;
|
|
int i;
|
|
p = name;
|
|
for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
|
|
while (*p && *p != '/')
|
|
p++;
|
|
/* tolerate duplicate slashes; see check_refname_format() */
|
|
while (*p == '/')
|
|
p++;
|
|
}
|
|
for (q = p; *q; q++)
|
|
;
|
|
while (1) {
|
|
while (q > p && *q != '/')
|
|
q--;
|
|
while (q > p && *(q-1) == '/')
|
|
q--;
|
|
if (q == p)
|
|
break;
|
|
*q = '\0';
|
|
if (rmdir(git_path("%s", name)))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* make sure nobody touched the ref, and unlink */
|
|
static void prune_ref(struct ref_to_prune *r)
|
|
{
|
|
struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
|
|
|
|
if (lock) {
|
|
unlink_or_warn(git_path("%s", r->name));
|
|
unlock_ref(lock);
|
|
try_remove_empty_parents(r->name);
|
|
}
|
|
}
|
|
|
|
static void prune_refs(struct ref_to_prune *r)
|
|
{
|
|
while (r) {
|
|
prune_ref(r);
|
|
r = r->next;
|
|
}
|
|
}
|
|
|
|
int pack_refs(unsigned int flags)
|
|
{
|
|
struct pack_refs_cb_data cbdata;
|
|
|
|
memset(&cbdata, 0, sizeof(cbdata));
|
|
cbdata.flags = flags;
|
|
|
|
lock_packed_refs(LOCK_DIE_ON_ERROR);
|
|
cbdata.packed_refs = get_packed_refs(&ref_cache);
|
|
|
|
do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
|
|
pack_if_possible_fn, &cbdata);
|
|
|
|
if (commit_packed_refs())
|
|
die_errno("unable to overwrite old ref-pack file");
|
|
|
|
prune_refs(cbdata.ref_to_prune);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If entry is no longer needed in packed-refs, add it to the string
|
|
* list pointed to by cb_data. Reasons for deleting entries:
|
|
*
|
|
* - Entry is broken.
|
|
* - Entry is overridden by a loose ref.
|
|
* - Entry does not point at a valid object.
|
|
*
|
|
* In the first and third cases, also emit an error message because these
|
|
* are indications of repository corruption.
|
|
*/
|
|
static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct string_list *refs_to_delete = cb_data;
|
|
|
|
if (entry->flag & REF_ISBROKEN) {
|
|
/* This shouldn't happen to packed refs. */
|
|
error("%s is broken!", entry->name);
|
|
string_list_append(refs_to_delete, entry->name);
|
|
return 0;
|
|
}
|
|
if (!has_sha1_file(entry->u.value.sha1)) {
|
|
unsigned char sha1[20];
|
|
int flags;
|
|
|
|
if (read_ref_full(entry->name, sha1, 0, &flags))
|
|
/* We should at least have found the packed ref. */
|
|
die("Internal error");
|
|
if ((flags & REF_ISSYMREF) || !(flags & REF_ISPACKED)) {
|
|
/*
|
|
* This packed reference is overridden by a
|
|
* loose reference, so it is OK that its value
|
|
* is no longer valid; for example, it might
|
|
* refer to an object that has been garbage
|
|
* collected. For this purpose we don't even
|
|
* care whether the loose reference itself is
|
|
* invalid, broken, symbolic, etc. Silently
|
|
* remove the packed reference.
|
|
*/
|
|
string_list_append(refs_to_delete, entry->name);
|
|
return 0;
|
|
}
|
|
/*
|
|
* There is no overriding loose reference, so the fact
|
|
* that this reference doesn't refer to a valid object
|
|
* indicates some kind of repository corruption.
|
|
* Report the problem, then omit the reference from
|
|
* the output.
|
|
*/
|
|
error("%s does not point to a valid object!", entry->name);
|
|
string_list_append(refs_to_delete, entry->name);
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int repack_without_ref(const char *refname)
|
|
{
|
|
struct ref_dir *packed;
|
|
struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
|
|
struct string_list_item *ref_to_delete;
|
|
|
|
if (!get_packed_ref(refname))
|
|
return 0; /* refname does not exist in packed refs */
|
|
|
|
if (lock_packed_refs(0)) {
|
|
unable_to_lock_error(git_path("packed-refs"), errno);
|
|
return error("cannot delete '%s' from packed refs", refname);
|
|
}
|
|
packed = get_packed_refs(&ref_cache);
|
|
|
|
/* Remove refname from the cache: */
|
|
if (remove_entry(packed, refname) == -1) {
|
|
/*
|
|
* The packed entry disappeared while we were
|
|
* acquiring the lock.
|
|
*/
|
|
rollback_packed_refs();
|
|
return 0;
|
|
}
|
|
|
|
/* Remove any other accumulated cruft: */
|
|
do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete);
|
|
for_each_string_list_item(ref_to_delete, &refs_to_delete) {
|
|
if (remove_entry(packed, ref_to_delete->string) == -1)
|
|
die("internal error");
|
|
}
|
|
|
|
/* Write what remains: */
|
|
return commit_packed_refs();
|
|
}
|
|
|
|
int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
|
|
{
|
|
struct ref_lock *lock;
|
|
int err, i = 0, ret = 0, flag = 0;
|
|
|
|
lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag);
|
|
if (!lock)
|
|
return 1;
|
|
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
|
|
/* loose */
|
|
i = strlen(lock->lk->filename) - 5; /* .lock */
|
|
lock->lk->filename[i] = 0;
|
|
err = unlink_or_warn(lock->lk->filename);
|
|
if (err && errno != ENOENT)
|
|
ret = 1;
|
|
|
|
lock->lk->filename[i] = '.';
|
|
}
|
|
/* removing the loose one could have resurrected an earlier
|
|
* packed one. Also, if it was not loose we need to repack
|
|
* without it.
|
|
*/
|
|
ret |= repack_without_ref(lock->ref_name);
|
|
|
|
unlink_or_warn(git_path("logs/%s", lock->ref_name));
|
|
clear_loose_ref_cache(&ref_cache);
|
|
unlock_ref(lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* People using contrib's git-new-workdir have .git/logs/refs ->
|
|
* /some/other/path/.git/logs/refs, and that may live on another device.
|
|
*
|
|
* IOW, to avoid cross device rename errors, the temporary renamed log must
|
|
* live into logs/refs.
|
|
*/
|
|
#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
|
|
|
|
int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
|
|
{
|
|
unsigned char sha1[20], orig_sha1[20];
|
|
int flag = 0, logmoved = 0;
|
|
struct ref_lock *lock;
|
|
struct stat loginfo;
|
|
int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
|
|
const char *symref = NULL;
|
|
|
|
if (log && S_ISLNK(loginfo.st_mode))
|
|
return error("reflog for %s is a symlink", oldrefname);
|
|
|
|
symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
|
|
if (flag & REF_ISSYMREF)
|
|
return error("refname %s is a symbolic ref, renaming it is not supported",
|
|
oldrefname);
|
|
if (!symref)
|
|
return error("refname %s not found", oldrefname);
|
|
|
|
if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache)))
|
|
return 1;
|
|
|
|
if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache)))
|
|
return 1;
|
|
|
|
if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
|
|
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
|
|
error("unable to delete old %s", oldrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
if (!read_ref_full(newrefname, sha1, 1, &flag) &&
|
|
delete_ref(newrefname, sha1, REF_NODEREF)) {
|
|
if (errno==EISDIR) {
|
|
if (remove_empty_directories(git_path("%s", newrefname))) {
|
|
error("Directory not empty: %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
} else {
|
|
error("unable to delete existing %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
}
|
|
|
|
if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
|
|
error("unable to create directory for %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
retry:
|
|
if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
|
|
if (errno==EISDIR || errno==ENOTDIR) {
|
|
/*
|
|
* rename(a, b) when b is an existing
|
|
* directory ought to result in ISDIR, but
|
|
* Solaris 5.8 gives ENOTDIR. Sheesh.
|
|
*/
|
|
if (remove_empty_directories(git_path("logs/%s", newrefname))) {
|
|
error("Directory not empty: logs/%s", newrefname);
|
|
goto rollback;
|
|
}
|
|
goto retry;
|
|
} else {
|
|
error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
|
|
newrefname, strerror(errno));
|
|
goto rollback;
|
|
}
|
|
}
|
|
logmoved = log;
|
|
|
|
lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for update", newrefname);
|
|
goto rollback;
|
|
}
|
|
lock->force_write = 1;
|
|
hashcpy(lock->old_sha1, orig_sha1);
|
|
if (write_ref_sha1(lock, orig_sha1, logmsg)) {
|
|
error("unable to write current sha1 into %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rollback:
|
|
lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for rollback", oldrefname);
|
|
goto rollbacklog;
|
|
}
|
|
|
|
lock->force_write = 1;
|
|
flag = log_all_ref_updates;
|
|
log_all_ref_updates = 0;
|
|
if (write_ref_sha1(lock, orig_sha1, NULL))
|
|
error("unable to write current sha1 into %s", oldrefname);
|
|
log_all_ref_updates = flag;
|
|
|
|
rollbacklog:
|
|
if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from %s: %s",
|
|
oldrefname, newrefname, strerror(errno));
|
|
if (!logmoved && log &&
|
|
rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
return 1;
|
|
}
|
|
|
|
int close_ref(struct ref_lock *lock)
|
|
{
|
|
if (close_lock_file(lock->lk))
|
|
return -1;
|
|
lock->lock_fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
int commit_ref(struct ref_lock *lock)
|
|
{
|
|
if (commit_lock_file(lock->lk))
|
|
return -1;
|
|
lock->lock_fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
void unlock_ref(struct ref_lock *lock)
|
|
{
|
|
/* Do not free lock->lk -- atexit() still looks at them */
|
|
if (lock->lk)
|
|
rollback_lock_file(lock->lk);
|
|
free(lock->ref_name);
|
|
free(lock->orig_ref_name);
|
|
free(lock);
|
|
}
|
|
|
|
/*
|
|
* copy the reflog message msg to buf, which has been allocated sufficiently
|
|
* large, while cleaning up the whitespaces. Especially, convert LF to space,
|
|
* because reflog file is one line per entry.
|
|
*/
|
|
static int copy_msg(char *buf, const char *msg)
|
|
{
|
|
char *cp = buf;
|
|
char c;
|
|
int wasspace = 1;
|
|
|
|
*cp++ = '\t';
|
|
while ((c = *msg++)) {
|
|
if (wasspace && isspace(c))
|
|
continue;
|
|
wasspace = isspace(c);
|
|
if (wasspace)
|
|
c = ' ';
|
|
*cp++ = c;
|
|
}
|
|
while (buf < cp && isspace(cp[-1]))
|
|
cp--;
|
|
*cp++ = '\n';
|
|
return cp - buf;
|
|
}
|
|
|
|
int log_ref_setup(const char *refname, char *logfile, int bufsize)
|
|
{
|
|
int logfd, oflags = O_APPEND | O_WRONLY;
|
|
|
|
git_snpath(logfile, bufsize, "logs/%s", refname);
|
|
if (log_all_ref_updates &&
|
|
(!prefixcmp(refname, "refs/heads/") ||
|
|
!prefixcmp(refname, "refs/remotes/") ||
|
|
!prefixcmp(refname, "refs/notes/") ||
|
|
!strcmp(refname, "HEAD"))) {
|
|
if (safe_create_leading_directories(logfile) < 0)
|
|
return error("unable to create directory for %s",
|
|
logfile);
|
|
oflags |= O_CREAT;
|
|
}
|
|
|
|
logfd = open(logfile, oflags, 0666);
|
|
if (logfd < 0) {
|
|
if (!(oflags & O_CREAT) && errno == ENOENT)
|
|
return 0;
|
|
|
|
if ((oflags & O_CREAT) && errno == EISDIR) {
|
|
if (remove_empty_directories(logfile)) {
|
|
return error("There are still logs under '%s'",
|
|
logfile);
|
|
}
|
|
logfd = open(logfile, oflags, 0666);
|
|
}
|
|
|
|
if (logfd < 0)
|
|
return error("Unable to append to %s: %s",
|
|
logfile, strerror(errno));
|
|
}
|
|
|
|
adjust_shared_perm(logfile);
|
|
close(logfd);
|
|
return 0;
|
|
}
|
|
|
|
static int log_ref_write(const char *refname, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg)
|
|
{
|
|
int logfd, result, written, oflags = O_APPEND | O_WRONLY;
|
|
unsigned maxlen, len;
|
|
int msglen;
|
|
char log_file[PATH_MAX];
|
|
char *logrec;
|
|
const char *committer;
|
|
|
|
if (log_all_ref_updates < 0)
|
|
log_all_ref_updates = !is_bare_repository();
|
|
|
|
result = log_ref_setup(refname, log_file, sizeof(log_file));
|
|
if (result)
|
|
return result;
|
|
|
|
logfd = open(log_file, oflags);
|
|
if (logfd < 0)
|
|
return 0;
|
|
msglen = msg ? strlen(msg) : 0;
|
|
committer = git_committer_info(0);
|
|
maxlen = strlen(committer) + msglen + 100;
|
|
logrec = xmalloc(maxlen);
|
|
len = sprintf(logrec, "%s %s %s\n",
|
|
sha1_to_hex(old_sha1),
|
|
sha1_to_hex(new_sha1),
|
|
committer);
|
|
if (msglen)
|
|
len += copy_msg(logrec + len - 1, msg) - 1;
|
|
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
|
|
free(logrec);
|
|
if (close(logfd) != 0 || written != len)
|
|
return error("Unable to append to %s", log_file);
|
|
return 0;
|
|
}
|
|
|
|
static int is_branch(const char *refname)
|
|
{
|
|
return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
|
|
}
|
|
|
|
int write_ref_sha1(struct ref_lock *lock,
|
|
const unsigned char *sha1, const char *logmsg)
|
|
{
|
|
static char term = '\n';
|
|
struct object *o;
|
|
|
|
if (!lock)
|
|
return -1;
|
|
if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
o = parse_object(sha1);
|
|
if (!o) {
|
|
error("Trying to write ref %s with nonexistent object %s",
|
|
lock->ref_name, sha1_to_hex(sha1));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
|
|
error("Trying to write non-commit object %s to branch %s",
|
|
sha1_to_hex(sha1), lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
|
|
write_in_full(lock->lock_fd, &term, 1) != 1
|
|
|| close_ref(lock) < 0) {
|
|
error("Couldn't write %s", lock->lk->filename);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
clear_loose_ref_cache(&ref_cache);
|
|
if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
|
|
(strcmp(lock->ref_name, lock->orig_ref_name) &&
|
|
log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
|
|
/*
|
|
* Special hack: If a branch is updated directly and HEAD
|
|
* points to it (may happen on the remote side of a push
|
|
* for example) then logically the HEAD reflog should be
|
|
* updated too.
|
|
* A generic solution implies reverse symref information,
|
|
* but finding all symrefs pointing to the given branch
|
|
* would be rather costly for this rare event (the direct
|
|
* update of a branch) to be worth it. So let's cheat and
|
|
* check with HEAD only which should cover 99% of all usage
|
|
* scenarios (even 100% of the default ones).
|
|
*/
|
|
unsigned char head_sha1[20];
|
|
int head_flag;
|
|
const char *head_ref;
|
|
head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
|
|
if (head_ref && (head_flag & REF_ISSYMREF) &&
|
|
!strcmp(head_ref, lock->ref_name))
|
|
log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
|
|
}
|
|
if (commit_ref(lock)) {
|
|
error("Couldn't set %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
int create_symref(const char *ref_target, const char *refs_heads_master,
|
|
const char *logmsg)
|
|
{
|
|
const char *lockpath;
|
|
char ref[1000];
|
|
int fd, len, written;
|
|
char *git_HEAD = git_pathdup("%s", ref_target);
|
|
unsigned char old_sha1[20], new_sha1[20];
|
|
|
|
if (logmsg && read_ref(ref_target, old_sha1))
|
|
hashclr(old_sha1);
|
|
|
|
if (safe_create_leading_directories(git_HEAD) < 0)
|
|
return error("unable to create directory for %s", git_HEAD);
|
|
|
|
#ifndef NO_SYMLINK_HEAD
|
|
if (prefer_symlink_refs) {
|
|
unlink(git_HEAD);
|
|
if (!symlink(refs_heads_master, git_HEAD))
|
|
goto done;
|
|
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
|
|
}
|
|
#endif
|
|
|
|
len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
|
|
if (sizeof(ref) <= len) {
|
|
error("refname too long: %s", refs_heads_master);
|
|
goto error_free_return;
|
|
}
|
|
lockpath = mkpath("%s.lock", git_HEAD);
|
|
fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
|
|
if (fd < 0) {
|
|
error("Unable to open %s for writing", lockpath);
|
|
goto error_free_return;
|
|
}
|
|
written = write_in_full(fd, ref, len);
|
|
if (close(fd) != 0 || written != len) {
|
|
error("Unable to write to %s", lockpath);
|
|
goto error_unlink_return;
|
|
}
|
|
if (rename(lockpath, git_HEAD) < 0) {
|
|
error("Unable to create %s", git_HEAD);
|
|
goto error_unlink_return;
|
|
}
|
|
if (adjust_shared_perm(git_HEAD)) {
|
|
error("Unable to fix permissions on %s", lockpath);
|
|
error_unlink_return:
|
|
unlink_or_warn(lockpath);
|
|
error_free_return:
|
|
free(git_HEAD);
|
|
return -1;
|
|
}
|
|
|
|
#ifndef NO_SYMLINK_HEAD
|
|
done:
|
|
#endif
|
|
if (logmsg && !read_ref(refs_heads_master, new_sha1))
|
|
log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
|
|
|
|
free(git_HEAD);
|
|
return 0;
|
|
}
|
|
|
|
static char *ref_msg(const char *line, const char *endp)
|
|
{
|
|
const char *ep;
|
|
line += 82;
|
|
ep = memchr(line, '\n', endp - line);
|
|
if (!ep)
|
|
ep = endp;
|
|
return xmemdupz(line, ep - line);
|
|
}
|
|
|
|
int read_ref_at(const char *refname, unsigned long at_time, int cnt,
|
|
unsigned char *sha1, char **msg,
|
|
unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
|
|
{
|
|
const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
|
|
char *tz_c;
|
|
int logfd, tz, reccnt = 0;
|
|
struct stat st;
|
|
unsigned long date;
|
|
unsigned char logged_sha1[20];
|
|
void *log_mapped;
|
|
size_t mapsz;
|
|
|
|
logfile = git_path("logs/%s", refname);
|
|
logfd = open(logfile, O_RDONLY, 0);
|
|
if (logfd < 0)
|
|
die_errno("Unable to read log '%s'", logfile);
|
|
fstat(logfd, &st);
|
|
if (!st.st_size)
|
|
die("Log %s is empty.", logfile);
|
|
mapsz = xsize_t(st.st_size);
|
|
log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
|
|
logdata = log_mapped;
|
|
close(logfd);
|
|
|
|
lastrec = NULL;
|
|
rec = logend = logdata + st.st_size;
|
|
while (logdata < rec) {
|
|
reccnt++;
|
|
if (logdata < rec && *(rec-1) == '\n')
|
|
rec--;
|
|
lastgt = NULL;
|
|
while (logdata < rec && *(rec-1) != '\n') {
|
|
rec--;
|
|
if (*rec == '>')
|
|
lastgt = rec;
|
|
}
|
|
if (!lastgt)
|
|
die("Log %s is corrupt.", logfile);
|
|
date = strtoul(lastgt + 1, &tz_c, 10);
|
|
if (date <= at_time || cnt == 0) {
|
|
tz = strtoul(tz_c, NULL, 10);
|
|
if (msg)
|
|
*msg = ref_msg(rec, logend);
|
|
if (cutoff_time)
|
|
*cutoff_time = date;
|
|
if (cutoff_tz)
|
|
*cutoff_tz = tz;
|
|
if (cutoff_cnt)
|
|
*cutoff_cnt = reccnt - 1;
|
|
if (lastrec) {
|
|
if (get_sha1_hex(lastrec, logged_sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (get_sha1_hex(rec + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (hashcmp(logged_sha1, sha1)) {
|
|
warning("Log %s has gap after %s.",
|
|
logfile, show_date(date, tz, DATE_RFC2822));
|
|
}
|
|
}
|
|
else if (date == at_time) {
|
|
if (get_sha1_hex(rec + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
}
|
|
else {
|
|
if (get_sha1_hex(rec + 41, logged_sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (hashcmp(logged_sha1, sha1)) {
|
|
warning("Log %s unexpectedly ended on %s.",
|
|
logfile, show_date(date, tz, DATE_RFC2822));
|
|
}
|
|
}
|
|
munmap(log_mapped, mapsz);
|
|
return 0;
|
|
}
|
|
lastrec = rec;
|
|
if (cnt > 0)
|
|
cnt--;
|
|
}
|
|
|
|
rec = logdata;
|
|
while (rec < logend && *rec != '>' && *rec != '\n')
|
|
rec++;
|
|
if (rec == logend || *rec == '\n')
|
|
die("Log %s is corrupt.", logfile);
|
|
date = strtoul(rec + 1, &tz_c, 10);
|
|
tz = strtoul(tz_c, NULL, 10);
|
|
if (get_sha1_hex(logdata, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (is_null_sha1(sha1)) {
|
|
if (get_sha1_hex(logdata + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
}
|
|
if (msg)
|
|
*msg = ref_msg(logdata, logend);
|
|
munmap(log_mapped, mapsz);
|
|
|
|
if (cutoff_time)
|
|
*cutoff_time = date;
|
|
if (cutoff_tz)
|
|
*cutoff_tz = tz;
|
|
if (cutoff_cnt)
|
|
*cutoff_cnt = reccnt;
|
|
return 1;
|
|
}
|
|
|
|
static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
unsigned char osha1[20], nsha1[20];
|
|
char *email_end, *message;
|
|
unsigned long timestamp;
|
|
int tz;
|
|
|
|
/* old SP new SP name <email> SP time TAB msg LF */
|
|
if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' ||
|
|
get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' ||
|
|
get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' ||
|
|
!(email_end = strchr(sb->buf + 82, '>')) ||
|
|
email_end[1] != ' ' ||
|
|
!(timestamp = strtoul(email_end + 2, &message, 10)) ||
|
|
!message || message[0] != ' ' ||
|
|
(message[1] != '+' && message[1] != '-') ||
|
|
!isdigit(message[2]) || !isdigit(message[3]) ||
|
|
!isdigit(message[4]) || !isdigit(message[5]))
|
|
return 0; /* corrupt? */
|
|
email_end[1] = '\0';
|
|
tz = strtol(message + 1, NULL, 10);
|
|
if (message[6] != '\t')
|
|
message += 6;
|
|
else
|
|
message += 7;
|
|
return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
|
|
}
|
|
|
|
static char *find_beginning_of_line(char *bob, char *scan)
|
|
{
|
|
while (bob < scan && *(--scan) != '\n')
|
|
; /* keep scanning backwards */
|
|
/*
|
|
* Return either beginning of the buffer, or LF at the end of
|
|
* the previous line.
|
|
*/
|
|
return scan;
|
|
}
|
|
|
|
int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
FILE *logfp;
|
|
long pos;
|
|
int ret = 0, at_tail = 1;
|
|
|
|
logfp = fopen(git_path("logs/%s", refname), "r");
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
/* Jump to the end */
|
|
if (fseek(logfp, 0, SEEK_END) < 0)
|
|
return error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
pos = ftell(logfp);
|
|
while (!ret && 0 < pos) {
|
|
int cnt;
|
|
size_t nread;
|
|
char buf[BUFSIZ];
|
|
char *endp, *scanp;
|
|
|
|
/* Fill next block from the end */
|
|
cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
|
|
if (fseek(logfp, pos - cnt, SEEK_SET))
|
|
return error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
nread = fread(buf, cnt, 1, logfp);
|
|
if (nread != 1)
|
|
return error("cannot read %d bytes from reflog for %s: %s",
|
|
cnt, refname, strerror(errno));
|
|
pos -= cnt;
|
|
|
|
scanp = endp = buf + cnt;
|
|
if (at_tail && scanp[-1] == '\n')
|
|
/* Looking at the final LF at the end of the file */
|
|
scanp--;
|
|
at_tail = 0;
|
|
|
|
while (buf < scanp) {
|
|
/*
|
|
* terminating LF of the previous line, or the beginning
|
|
* of the buffer.
|
|
*/
|
|
char *bp;
|
|
|
|
bp = find_beginning_of_line(buf, scanp);
|
|
|
|
if (*bp != '\n') {
|
|
strbuf_splice(&sb, 0, 0, buf, endp - buf);
|
|
if (pos)
|
|
break; /* need to fill another block */
|
|
scanp = buf - 1; /* leave loop */
|
|
} else {
|
|
/*
|
|
* (bp + 1) thru endp is the beginning of the
|
|
* current line we have in sb
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
|
|
scanp = bp;
|
|
endp = bp + 1;
|
|
}
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
strbuf_reset(&sb);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
}
|
|
if (!ret && sb.len)
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
FILE *logfp;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = 0;
|
|
|
|
logfp = fopen(git_path("logs/%s", refname), "r");
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
/*
|
|
* Call fn for each reflog in the namespace indicated by name. name
|
|
* must be empty or end with '/'. Name will be used as a scratch
|
|
* space, but its contents will be restored before return.
|
|
*/
|
|
static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data)
|
|
{
|
|
DIR *d = opendir(git_path("logs/%s", name->buf));
|
|
int retval = 0;
|
|
struct dirent *de;
|
|
int oldlen = name->len;
|
|
|
|
if (!d)
|
|
return name->len ? errno : 0;
|
|
|
|
while ((de = readdir(d)) != NULL) {
|
|
struct stat st;
|
|
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
if (has_extension(de->d_name, ".lock"))
|
|
continue;
|
|
strbuf_addstr(name, de->d_name);
|
|
if (stat(git_path("logs/%s", name->buf), &st) < 0) {
|
|
; /* silently ignore */
|
|
} else {
|
|
if (S_ISDIR(st.st_mode)) {
|
|
strbuf_addch(name, '/');
|
|
retval = do_for_each_reflog(name, fn, cb_data);
|
|
} else {
|
|
unsigned char sha1[20];
|
|
if (read_ref_full(name->buf, sha1, 0, NULL))
|
|
retval = error("bad ref for %s", name->buf);
|
|
else
|
|
retval = fn(name->buf, sha1, 0, cb_data);
|
|
}
|
|
if (retval)
|
|
break;
|
|
}
|
|
strbuf_setlen(name, oldlen);
|
|
}
|
|
closedir(d);
|
|
return retval;
|
|
}
|
|
|
|
int for_each_reflog(each_ref_fn fn, void *cb_data)
|
|
{
|
|
int retval;
|
|
struct strbuf name;
|
|
strbuf_init(&name, PATH_MAX);
|
|
retval = do_for_each_reflog(&name, fn, cb_data);
|
|
strbuf_release(&name);
|
|
return retval;
|
|
}
|
|
|
|
int update_ref(const char *action, const char *refname,
|
|
const unsigned char *sha1, const unsigned char *oldval,
|
|
int flags, enum action_on_err onerr)
|
|
{
|
|
static struct ref_lock *lock;
|
|
lock = lock_any_ref_for_update(refname, oldval, flags);
|
|
if (!lock) {
|
|
const char *str = "Cannot lock the ref '%s'.";
|
|
switch (onerr) {
|
|
case MSG_ON_ERR: error(str, refname); break;
|
|
case DIE_ON_ERR: die(str, refname); break;
|
|
case QUIET_ON_ERR: break;
|
|
}
|
|
return 1;
|
|
}
|
|
if (write_ref_sha1(lock, sha1, action) < 0) {
|
|
const char *str = "Cannot update the ref '%s'.";
|
|
switch (onerr) {
|
|
case MSG_ON_ERR: error(str, refname); break;
|
|
case DIE_ON_ERR: die(str, refname); break;
|
|
case QUIET_ON_ERR: break;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct ref *find_ref_by_name(const struct ref *list, const char *name)
|
|
{
|
|
for ( ; list; list = list->next)
|
|
if (!strcmp(list->name, name))
|
|
return (struct ref *)list;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* generate a format suitable for scanf from a ref_rev_parse_rules
|
|
* rule, that is replace the "%.*s" spec with a "%s" spec
|
|
*/
|
|
static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
|
|
{
|
|
char *spec;
|
|
|
|
spec = strstr(rule, "%.*s");
|
|
if (!spec || strstr(spec + 4, "%.*s"))
|
|
die("invalid rule in ref_rev_parse_rules: %s", rule);
|
|
|
|
/* copy all until spec */
|
|
strncpy(scanf_fmt, rule, spec - rule);
|
|
scanf_fmt[spec - rule] = '\0';
|
|
/* copy new spec */
|
|
strcat(scanf_fmt, "%s");
|
|
/* copy remaining rule */
|
|
strcat(scanf_fmt, spec + 4);
|
|
|
|
return;
|
|
}
|
|
|
|
char *shorten_unambiguous_ref(const char *refname, int strict)
|
|
{
|
|
int i;
|
|
static char **scanf_fmts;
|
|
static int nr_rules;
|
|
char *short_name;
|
|
|
|
/* pre generate scanf formats from ref_rev_parse_rules[] */
|
|
if (!nr_rules) {
|
|
size_t total_len = 0;
|
|
|
|
/* the rule list is NULL terminated, count them first */
|
|
for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
|
|
/* no +1 because strlen("%s") < strlen("%.*s") */
|
|
total_len += strlen(ref_rev_parse_rules[nr_rules]);
|
|
|
|
scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
|
|
|
|
total_len = 0;
|
|
for (i = 0; i < nr_rules; i++) {
|
|
scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
|
|
+ total_len;
|
|
gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
|
|
total_len += strlen(ref_rev_parse_rules[i]);
|
|
}
|
|
}
|
|
|
|
/* bail out if there are no rules */
|
|
if (!nr_rules)
|
|
return xstrdup(refname);
|
|
|
|
/* buffer for scanf result, at most refname must fit */
|
|
short_name = xstrdup(refname);
|
|
|
|
/* skip first rule, it will always match */
|
|
for (i = nr_rules - 1; i > 0 ; --i) {
|
|
int j;
|
|
int rules_to_fail = i;
|
|
int short_name_len;
|
|
|
|
if (1 != sscanf(refname, scanf_fmts[i], short_name))
|
|
continue;
|
|
|
|
short_name_len = strlen(short_name);
|
|
|
|
/*
|
|
* in strict mode, all (except the matched one) rules
|
|
* must fail to resolve to a valid non-ambiguous ref
|
|
*/
|
|
if (strict)
|
|
rules_to_fail = nr_rules;
|
|
|
|
/*
|
|
* check if the short name resolves to a valid ref,
|
|
* but use only rules prior to the matched one
|
|
*/
|
|
for (j = 0; j < rules_to_fail; j++) {
|
|
const char *rule = ref_rev_parse_rules[j];
|
|
char refname[PATH_MAX];
|
|
|
|
/* skip matched rule */
|
|
if (i == j)
|
|
continue;
|
|
|
|
/*
|
|
* the short name is ambiguous, if it resolves
|
|
* (with this previous rule) to a valid ref
|
|
* read_ref() returns 0 on success
|
|
*/
|
|
mksnpath(refname, sizeof(refname),
|
|
rule, short_name_len, short_name);
|
|
if (ref_exists(refname))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* short name is non-ambiguous if all previous rules
|
|
* haven't resolved to a valid ref
|
|
*/
|
|
if (j == rules_to_fail)
|
|
return short_name;
|
|
}
|
|
|
|
free(short_name);
|
|
return xstrdup(refname);
|
|
}
|
|
|
|
static struct string_list *hide_refs;
|
|
|
|
int parse_hide_refs_config(const char *var, const char *value, const char *section)
|
|
{
|
|
if (!strcmp("transfer.hiderefs", var) ||
|
|
/* NEEDSWORK: use parse_config_key() once both are merged */
|
|
(!prefixcmp(var, section) && var[strlen(section)] == '.' &&
|
|
!strcmp(var + strlen(section), ".hiderefs"))) {
|
|
char *ref;
|
|
int len;
|
|
|
|
if (!value)
|
|
return config_error_nonbool(var);
|
|
ref = xstrdup(value);
|
|
len = strlen(ref);
|
|
while (len && ref[len - 1] == '/')
|
|
ref[--len] = '\0';
|
|
if (!hide_refs) {
|
|
hide_refs = xcalloc(1, sizeof(*hide_refs));
|
|
hide_refs->strdup_strings = 1;
|
|
}
|
|
string_list_append(hide_refs, ref);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ref_is_hidden(const char *refname)
|
|
{
|
|
struct string_list_item *item;
|
|
|
|
if (!hide_refs)
|
|
return 0;
|
|
for_each_string_list_item(item, hide_refs) {
|
|
int len;
|
|
if (prefixcmp(refname, item->string))
|
|
continue;
|
|
len = strlen(item->string);
|
|
if (!refname[len] || refname[len] == '/')
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|