498f1f61f1
Currently, Git does not support repos with very large numbers of objects or repos that wish to minimize manipulation of certain blobs (for example, because they are very large) very well, even if the user operates mostly on part of the repo, because Git is designed on the assumption that every referenced object is available somewhere in the repo storage. In such an arrangement, the full set of objects is usually available in remote storage, ready to be lazily downloaded. Teach fsck about the new state of affairs. In this commit, teach fsck that missing promisor objects referenced from the reflog are not an error case; in future commits, fsck will be taught about other cases. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
152 lines
5.4 KiB
C
152 lines
5.4 KiB
C
#ifndef PACKFILE_H
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#define PACKFILE_H
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#include "oidset.h"
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/*
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* Generate the filename to be used for a pack file with checksum "sha1" and
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* extension "ext". The result is written into the strbuf "buf", overwriting
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* any existing contents. A pointer to buf->buf is returned as a convenience.
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*
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* Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
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*/
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extern char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
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/*
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* Return the name of the (local) packfile with the specified sha1 in
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* its name. The return value is a pointer to memory that is
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* overwritten each time this function is called.
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*/
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extern char *sha1_pack_name(const unsigned char *sha1);
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/*
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* Return the name of the (local) pack index file with the specified
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* sha1 in its name. The return value is a pointer to memory that is
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* overwritten each time this function is called.
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*/
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extern char *sha1_pack_index_name(const unsigned char *sha1);
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extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
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/* A hook to report invalid files in pack directory */
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#define PACKDIR_FILE_PACK 1
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#define PACKDIR_FILE_IDX 2
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#define PACKDIR_FILE_GARBAGE 4
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extern void (*report_garbage)(unsigned seen_bits, const char *path);
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extern void prepare_packed_git(void);
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extern void reprepare_packed_git(void);
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extern void install_packed_git(struct packed_git *pack);
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/*
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* Give a rough count of objects in the repository. This sacrifices accuracy
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* for speed.
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*/
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unsigned long approximate_object_count(void);
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extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
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struct packed_git *packs);
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extern void pack_report(void);
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/*
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* mmap the index file for the specified packfile (if it is not
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* already mmapped). Return 0 on success.
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*/
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extern int open_pack_index(struct packed_git *);
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/*
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* munmap the index file for the specified packfile (if it is
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* currently mmapped).
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*/
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extern void close_pack_index(struct packed_git *);
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extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
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extern void close_pack_windows(struct packed_git *);
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extern void close_all_packs(void);
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extern void unuse_pack(struct pack_window **);
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extern void clear_delta_base_cache(void);
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extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
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/*
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* Make sure that a pointer access into an mmap'd index file is within bounds,
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* and can provide at least 8 bytes of data.
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*
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* Note that this is only necessary for variable-length segments of the file
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* (like the 64-bit extended offset table), as we compare the size to the
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* fixed-length parts when we open the file.
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*/
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extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
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/*
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* Return the SHA-1 of the nth object within the specified packfile.
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* Open the index if it is not already open. The return value points
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* at the SHA-1 within the mmapped index. Return NULL if there is an
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* error.
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*/
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extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
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/*
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* Like nth_packed_object_sha1, but write the data into the object specified by
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* the the first argument. Returns the first argument on success, and NULL on
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* error.
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*/
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extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
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/*
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* Return the offset of the nth object within the specified packfile.
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* The index must already be opened.
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*/
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extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
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/*
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* If the object named sha1 is present in the specified packfile,
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* return its offset within the packfile; otherwise, return 0.
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*/
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extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
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extern int is_pack_valid(struct packed_git *);
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extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
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extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
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extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
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extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
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extern void release_pack_memory(size_t);
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/* global flag to enable extra checks when accessing packed objects */
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extern int do_check_packed_object_crc;
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extern int packed_object_info(struct packed_git *pack, off_t offset, struct object_info *);
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extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
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extern const struct packed_git *has_packed_and_bad(const unsigned char *sha1);
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extern int find_pack_entry(const unsigned char *sha1, struct pack_entry *e);
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extern int has_sha1_pack(const unsigned char *sha1);
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extern int has_pack_index(const unsigned char *sha1);
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/*
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* Only iterate over packs obtained from the promisor remote.
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*/
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#define FOR_EACH_OBJECT_PROMISOR_ONLY 2
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/*
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* Iterate over packed objects in both the local
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* repository and any alternates repositories (unless the
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* FOR_EACH_OBJECT_LOCAL_ONLY flag, defined in cache.h, is set).
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*/
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typedef int each_packed_object_fn(const struct object_id *oid,
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struct packed_git *pack,
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uint32_t pos,
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void *data);
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extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
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/*
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* Return 1 if an object in a promisor packfile is or refers to the given
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* object, 0 otherwise.
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*/
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extern int is_promisor_object(const struct object_id *oid);
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#endif
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