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repack_without_ref(): reimplement using do_for_each_ref_in_array()

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It costs a bit of boilerplate, but it means that the function can be
ignorant of how cached refs are stored.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2012-04-10 07:30:17 +02:00 committed by Junio C Hamano
parent b3fd060f9e
commit d66da478f2
1 changed files with 61 additions and 33 deletions
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94
refs.c
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@ -333,6 +333,30 @@ static int do_for_each_ref_in_arrays(struct ref_array *array1,
return 0;
}
/*
* 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)
{
int len1 = strlen(refname1);
int len2 = strlen(refname2);
int cmplen;
const char *lead;
if (len1 < len2) {
cmplen = len1;
lead = refname2;
} else {
cmplen = len2;
lead = refname1;
}
return !strncmp(refname1, refname2, cmplen) && lead[cmplen] == '/';
}
/*
* Return true iff a reference named refname could be created without
* conflicting with the name of an existing reference. If oldrefname
@ -343,20 +367,15 @@ static int do_for_each_ref_in_arrays(struct ref_array *array1,
static int is_refname_available(const char *refname, const char *oldrefname,
struct ref_array *array)
{
int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
int i;
for (i = 0; i < array->nr; i++) {
struct ref_entry *entry = array->refs[i];
/* entry->name could be 'foo' or 'foo/bar/baz' */
if (!oldrefname || strcmp(oldrefname, entry->name)) {
int len = strlen(entry->name);
int cmplen = (namlen < len) ? namlen : len;
const char *lead = (namlen < len) ? entry->name : refname;
if (!strncmp(refname, entry->name, cmplen) &&
lead[cmplen] == '/') {
error("'%s' exists; cannot create '%s'",
entry->name, refname);
return 0;
}
if (oldrefname && !strcmp(oldrefname, entry->name))
continue;
if (names_conflict(refname, entry->name)) {
error("'%s' exists; cannot create '%s'",
entry->name, refname);
return 0;
}
}
return 1;
@ -1333,36 +1352,45 @@ struct ref_lock *lock_any_ref_for_update(const char *refname,
return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
}
struct repack_without_ref_sb {
const char *refname;
int fd;
};
static int repack_without_ref_fn(const char *refname, const unsigned char *sha1,
int flags, void *cb_data)
{
struct repack_without_ref_sb *data = cb_data;
char line[PATH_MAX + 100];
int len;
if (!strcmp(data->refname, refname))
return 0;
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(data->fd, line, len);
return 0;
}
static struct lock_file packlock;
static int repack_without_ref(const char *refname)
{
struct ref_array *packed;
int fd, i;
packed = get_packed_refs(get_ref_cache(NULL));
struct repack_without_ref_sb data;
struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
sort_ref_array(packed);
if (search_ref_array(packed, refname) == NULL)
return 0;
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
if (fd < 0) {
data.refname = refname;
data.fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
if (data.fd < 0) {
unable_to_lock_error(git_path("packed-refs"), errno);
return error("cannot delete '%s' from packed refs", refname);
}
for (i = 0; i < packed->nr; i++) {
char line[PATH_MAX + 100];
int len;
struct ref_entry *ref = packed->refs[i];
if (!strcmp(refname, ref->name))
continue;
len = snprintf(line, sizeof(line), "%s %s\n",
sha1_to_hex(ref->sha1), ref->name);
/* this should not happen but just being defensive */
if (len > sizeof(line))
die("too long a refname '%s'", ref->name);
write_or_die(fd, line, len);
}
do_for_each_ref_in_array(packed, 0, "", repack_without_ref_fn, 0, 0, &data);
return commit_lock_file(&packlock);
}