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#include "cache.h"
#include "refs.h"
static const char *result_path, *lock_path;
static const char builtin_pack_refs_usage[] =
"git-pack-refs [--prune]";
struct ref_to_prune {
struct ref_to_prune *next;
unsigned char sha1[20];
char name[FLEX_ARRAY];
};
struct pack_refs_cb_data {
int prune;
struct ref_to_prune *ref_to_prune;
FILE *refs_file;
};
static void remove_lock_file(void)
{
if (lock_path)
unlink(lock_path);
}
static int do_not_prune(int flags)
{
/* If it is already packed or if it is a symref,
* do not prune it.
*/
return (flags & (REF_ISSYMREF|REF_ISPACKED));
}
static int handle_one_ref(const char *path, const unsigned char *sha1,
int flags, void *cb_data)
{
struct pack_refs_cb_data *cb = cb_data;
/* Do not pack the symbolic refs */
if (!(flags & REF_ISSYMREF))
fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
if (cb->prune && !do_not_prune(flags)) {
int namelen = strlen(path) + 1;
struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
hashcpy(n->sha1, sha1);
strcpy(n->name, path);
n->next = cb->ref_to_prune;
cb->ref_to_prune = n;
}
return 0;
}
/* 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(git_path("%s", r->name));
unlock_ref(lock);
}
}
static void prune_refs(struct ref_to_prune *r)
{
while (r) {
prune_ref(r);
r = r->next;
}
}
int cmd_pack_refs(int argc, const char **argv, const char *prefix)
{
int fd, i;
struct pack_refs_cb_data cbdata;
memset(&cbdata, 0, sizeof(cbdata));
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--prune")) {
cbdata.prune = 1;
continue;
}
/* perhaps other parameters later... */
break;
}
if (i != argc)
usage(builtin_pack_refs_usage);
result_path = xstrdup(git_path("packed-refs"));
lock_path = xstrdup(mkpath("%s.lock", result_path));
fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
if (fd < 0)
die("unable to create new ref-pack file (%s)", strerror(errno));
atexit(remove_lock_file);
cbdata.refs_file = fdopen(fd, "w");
if (!cbdata.refs_file)
die("unable to create ref-pack file structure (%s)",
strerror(errno));
for_each_ref(handle_one_ref, &cbdata);
fsync(fd);
fclose(cbdata.refs_file);
if (rename(lock_path, result_path) < 0)
die("unable to overwrite old ref-pack file (%s)", strerror(errno));
lock_path = NULL;
if (cbdata.prune)
prune_refs(cbdata.ref_to_prune);
return 0;
}
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