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#include "cache.h"
#include "builtin.h"
#include "commit.h"
#include "refs.h"
#include "dir.h"
#include "tree-walk.h"
static unsigned long default_reflog_expire;
static unsigned long default_reflog_expire_unreachable;
struct expire_reflog_cb {
FILE *newlog;
const char *ref;
struct commit *ref_commit;
unsigned long expire_total;
unsigned long expire_unreachable;
};
static int tree_is_complete(const unsigned char *sha1)
{
struct tree_desc desc;
void *buf;
char type[20];
buf = read_sha1_file(sha1, type, &desc.size);
if (!buf)
return 0;
desc.buf = buf;
while (desc.size) {
const unsigned char *elem;
const char *name;
unsigned mode;
elem = tree_entry_extract(&desc, &name, &mode);
if (!has_sha1_file(elem) ||
(S_ISDIR(mode) && !tree_is_complete(elem))) {
free(buf);
return 0;
}
update_tree_entry(&desc);
}
free(buf);
return 1;
}
static int keep_entry(struct commit **it, unsigned char *sha1)
{
struct commit *commit;
*it = NULL;
if (is_null_sha1(sha1))
return 1;
commit = lookup_commit_reference_gently(sha1, 1);
if (!commit)
return 0;
/* Make sure everything in this commit exists. */
parse_object(commit->object.sha1);
if (!tree_is_complete(commit->tree->object.sha1))
return 0;
*it = commit;
return 1;
}
static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
char *data, void *cb_data)
{
struct expire_reflog_cb *cb = cb_data;
unsigned long timestamp;
char *cp, *ep;
struct commit *old, *new;
cp = strchr(data, '>');
if (!cp || *++cp != ' ')
goto prune;
timestamp = strtoul(cp, &ep, 10);
if (*ep != ' ')
goto prune;
if (timestamp < cb->expire_total)
goto prune;
if (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))
goto prune;
if ((timestamp < cb->expire_unreachable) &&
(!cb->ref_commit ||
(old && !in_merge_bases(old, cb->ref_commit)) ||
(new && !in_merge_bases(new, cb->ref_commit))))
goto prune;
if (cb->newlog)
fprintf(cb->newlog, "%s %s %s",
sha1_to_hex(osha1), sha1_to_hex(nsha1), data);
return 0;
prune:
if (!cb->newlog)
fprintf(stderr, "would prune %s", data);
return 0;
}
struct cmd_reflog_expire_cb {
int dry_run;
unsigned long expire_total;
unsigned long expire_unreachable;
};
static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
{
struct cmd_reflog_expire_cb *cmd = cb_data;
struct expire_reflog_cb cb;
struct ref_lock *lock;
char *newlog_path = NULL;
int status = 0;
if (strncmp(ref, "refs/", 5))
return error("not a ref '%s'", ref);
memset(&cb, 0, sizeof(cb));
/* we take the lock for the ref itself to prevent it from
* getting updated.
*/
lock = lock_ref_sha1(ref + 5, sha1);
if (!lock)
return error("cannot lock ref '%s'", ref);
if (!file_exists(lock->log_file))
goto finish;
if (!cmd->dry_run) {
newlog_path = xstrdup(git_path("logs/%s.lock", ref));
cb.newlog = fopen(newlog_path, "w");
}
cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
if (!cb.ref_commit)
fprintf(stderr,
"warning: ref '%s' does not point at a commit\n", ref);
cb.ref = ref;
cb.expire_total = cmd->expire_total;
cb.expire_unreachable = cmd->expire_unreachable;
for_each_reflog_ent(ref, expire_reflog_ent, &cb);
finish:
if (cb.newlog) {
if (fclose(cb.newlog))
status |= error("%s: %s", strerror(errno),
newlog_path);
if (rename(newlog_path, lock->log_file)) {
status |= error("cannot rename %s to %s",
newlog_path, lock->log_file);
unlink(newlog_path);
}
}
free(newlog_path);
unlock_ref(lock);
return status;
}
static int reflog_expire_config(const char *var, const char *value)
{
if (!strcmp(var, "gc.reflogexpire"))
default_reflog_expire = approxidate(value);
else if (!strcmp(var, "gc.reflogexpireunreachable"))
default_reflog_expire_unreachable = approxidate(value);
else
return git_default_config(var, value);
return 0;
}
static const char reflog_expire_usage[] =
"git-reflog expire [--dry-run] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
{
struct cmd_reflog_expire_cb cb;
unsigned long now = time(NULL);
int i, status, do_all;
git_config(reflog_expire_config);
save_commit_buffer = 0;
do_all = status = 0;
memset(&cb, 0, sizeof(cb));
if (!default_reflog_expire_unreachable)
default_reflog_expire_unreachable = now - 30 * 24 * 3600;
if (!default_reflog_expire)
default_reflog_expire = now - 90 * 24 * 3600;
cb.expire_total = default_reflog_expire;
cb.expire_unreachable = default_reflog_expire_unreachable;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
cb.dry_run = 1;
else if (!strncmp(arg, "--expire=", 9))
cb.expire_total = approxidate(arg + 9);
else if (!strncmp(arg, "--expire-unreachable=", 21))
cb.expire_unreachable = approxidate(arg + 21);
else if (!strcmp(arg, "--all"))
do_all = 1;
else if (!strcmp(arg, "--")) {
i++;
break;
}
else if (arg[0] == '-')
usage(reflog_expire_usage);
else
break;
}
if (do_all)
status |= for_each_ref(expire_reflog, &cb);
while (i < argc) {
const char *ref = argv[i++];
unsigned char sha1[20];
if (!resolve_ref(ref, sha1, 1, NULL)) {
status |= error("%s points nowhere!", ref);
continue;
}
status |= expire_reflog(ref, sha1, 0, &cb);
}
return status;
}
static const char reflog_usage[] =
"git-reflog (expire | ...)";
int cmd_reflog(int argc, const char **argv, const char *prefix)
{
if (argc < 2)
usage(reflog_usage);
else if (!strcmp(argv[1], "expire"))
return cmd_reflog_expire(argc - 1, argv + 1, prefix);
else
usage(reflog_usage);
}
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