[thirdparty/git.git] / builtin-reflog.c

#include "cache.h"
#include "builtin.h"
#include "commit.h"
#include "refs.h"
#include "dir.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "reachable.h"

/*
 * reflog expire
 */

static const char reflog_expire_usage[] =
"git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";

static unsigned long default_reflog_expire;
static unsigned long default_reflog_expire_unreachable;

struct cmd_reflog_expire_cb {
	struct rev_info revs;
	int dry_run;
	int stalefix;
	int verbose;
	unsigned long expire_total;
	unsigned long expire_unreachable;
};

struct expire_reflog_cb {
	FILE *newlog;
	const char *ref;
	struct commit *ref_commit;
	struct cmd_reflog_expire_cb *cmd;
};

struct collected_reflog {
	unsigned char sha1[20];
	char reflog[FLEX_ARRAY];
};
struct collect_reflog_cb {
	struct collected_reflog **e;
	int alloc;
	int nr;
};

#define INCOMPLETE	(1u<<10)
#define STUDYING	(1u<<11)

static int tree_is_complete(const unsigned char *sha1)
{
	struct tree_desc desc;
	struct name_entry entry;
	int complete;
	struct tree *tree;

	tree = lookup_tree(sha1);
	if (!tree)
		return 0;
	if (tree->object.flags & SEEN)
		return 1;
	if (tree->object.flags & INCOMPLETE)
		return 0;

	if (!tree->buffer) {
		enum object_type type;
		unsigned long size;
		void *data = read_sha1_file(sha1, &type, &size);
		if (!data) {
			tree->object.flags |= INCOMPLETE;
			return 0;
		}
		tree->buffer = data;
		tree->size = size;
	}
	init_tree_desc(&desc, tree->buffer, tree->size);
	complete = 1;
	while (tree_entry(&desc, &entry)) {
		if (!has_sha1_file(entry.sha1) ||
		    (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
			tree->object.flags |= INCOMPLETE;
			complete = 0;
		}
	}
	free(tree->buffer);
	tree->buffer = NULL;

	if (complete)
		tree->object.flags |= SEEN;
	return complete;
}

static int commit_is_complete(struct commit *commit)
{
	struct object_array study;
	struct object_array found;
	int is_incomplete = 0;
	int i;

	/* early return */
	if (commit->object.flags & SEEN)
		return 1;
	if (commit->object.flags & INCOMPLETE)
		return 0;
	/*
	 * Find all commits that are reachable and are not marked as
	 * SEEN.  Then make sure the trees and blobs contained are
	 * complete.  After that, mark these commits also as SEEN.
	 * If some of the objects that are needed to complete this
	 * commit are missing, mark this commit as INCOMPLETE.
	 */
	memset(&study, 0, sizeof(study));
	memset(&found, 0, sizeof(found));
	add_object_array(&commit->object, NULL, &study);
	add_object_array(&commit->object, NULL, &found);
	commit->object.flags |= STUDYING;
	while (study.nr) {
		struct commit *c;
		struct commit_list *parent;

		c = (struct commit *)study.objects[--study.nr].item;
		if (!c->object.parsed && !parse_object(c->object.sha1))
			c->object.flags |= INCOMPLETE;

		if (c->object.flags & INCOMPLETE) {
			is_incomplete = 1;
			break;
		}
		else if (c->object.flags & SEEN)
			continue;
		for (parent = c->parents; parent; parent = parent->next) {
			struct commit *p = parent->item;
			if (p->object.flags & STUDYING)
				continue;
			p->object.flags |= STUDYING;
			add_object_array(&p->object, NULL, &study);
			add_object_array(&p->object, NULL, &found);
		}
	}
	if (!is_incomplete) {
		/*
		 * make sure all commits in "found" array have all the
		 * necessary objects.
		 */
		for (i = 0; i < found.nr; i++) {
			struct commit *c =
				(struct commit *)found.objects[i].item;
			if (!tree_is_complete(c->tree->object.sha1)) {
				is_incomplete = 1;
				c->object.flags |= INCOMPLETE;
			}
		}
		if (!is_incomplete) {
			/* mark all found commits as complete, iow SEEN */
			for (i = 0; i < found.nr; i++)
				found.objects[i].item->flags |= SEEN;
		}
	}
	/* clear flags from the objects we traversed */
	for (i = 0; i < found.nr; i++)
		found.objects[i].item->flags &= ~STUDYING;
	if (is_incomplete)
		commit->object.flags |= INCOMPLETE;
	else {
		/*
		 * If we come here, we have (1) traversed the ancestry chain
		 * from the "commit" until we reach SEEN commits (which are
		 * known to be complete), and (2) made sure that the commits
		 * encountered during the above traversal refer to trees that
		 * are complete.  Which means that we know *all* the commits
		 * we have seen during this process are complete.
		 */
		for (i = 0; i < found.nr; i++)
			found.objects[i].item->flags |= SEEN;
	}
	/* free object arrays */
	free(study.objects);
	free(found.objects);
	return !is_incomplete;
}

static int keep_entry(struct commit **it, unsigned char *sha1)
{
	struct commit *commit;

	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.
	 *
	 * We have walked all the objects reachable from the refs
	 * and cache earlier.  The commits reachable by this commit
	 * must meet SEEN commits -- and then we should mark them as
	 * SEEN as well.
	 */
	if (!commit_is_complete(commit))
		return 0;
	*it = commit;
	return 1;
}

static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
		const char *email, unsigned long timestamp, int tz,
		const char *message, void *cb_data)
{
	struct expire_reflog_cb *cb = cb_data;
	struct commit *old, *new;

	if (timestamp < cb->cmd->expire_total)
		goto prune;

	old = new = NULL;
	if (cb->cmd->stalefix &&
	    (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
		goto prune;

	if (timestamp < cb->cmd->expire_unreachable) {
		if (!cb->ref_commit)
			goto prune;
		if (!old && !is_null_sha1(osha1))
			old = lookup_commit_reference_gently(osha1, 1);
		if (!new && !is_null_sha1(nsha1))
			new = lookup_commit_reference_gently(nsha1, 1);
		if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) ||
		    (new && !in_merge_bases(new, &cb->ref_commit, 1)))
			goto prune;
	}

	if (cb->newlog) {
		char sign = (tz < 0) ? '-' : '+';
		int zone = (tz < 0) ? (-tz) : tz;
		fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
			sha1_to_hex(osha1), sha1_to_hex(nsha1),
			email, timestamp, sign, zone,
			message);
	}
	if (cb->cmd->verbose)
		printf("keep %s", message);
	return 0;
 prune:
	if (!cb->newlog || cb->cmd->verbose)
		printf("%sprune %s", cb->newlog ? "" : "would ", message);
	return 0;
}

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 *log_file, *newlog_path = NULL;
	int status = 0;

	memset(&cb, 0, sizeof(cb));
	/* we take the lock for the ref itself to prevent it from
	 * getting updated.
	 */
	lock = lock_any_ref_for_update(ref, sha1, 0);
	if (!lock)
		return error("cannot lock ref '%s'", ref);
	log_file = xstrdup(git_path("logs/%s", ref));
	if (!file_exists(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);
	cb.ref = ref;
	cb.cmd = cmd;
	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, log_file)) {
			status |= error("cannot rename %s to %s",
					newlog_path, log_file);
			unlink(newlog_path);
		}
	}
	free(newlog_path);
	free(log_file);
	unlock_ref(lock);
	return status;
}

static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
{
	struct collected_reflog *e;
	struct collect_reflog_cb *cb = cb_data;
	size_t namelen = strlen(ref);

	e = xmalloc(sizeof(*e) + namelen + 1);
	hashcpy(e->sha1, sha1);
	memcpy(e->reflog, ref, namelen + 1);
	ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
	cb->e[cb->nr++] = e;
	return 0;
}

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 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;

	/*
	 * We can trust the commits and objects reachable from refs
	 * even in older repository.  We cannot trust what's reachable
	 * from reflog if the repository was pruned with older git.
	 */

	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 (!prefixcmp(arg, "--expire="))
			cb.expire_total = approxidate(arg + 9);
		else if (!prefixcmp(arg, "--expire-unreachable="))
			cb.expire_unreachable = approxidate(arg + 21);
		else if (!strcmp(arg, "--stale-fix"))
			cb.stalefix = 1;
		else if (!strcmp(arg, "--all"))
			do_all = 1;
		else if (!strcmp(arg, "--verbose"))
			cb.verbose = 1;
		else if (!strcmp(arg, "--")) {
			i++;
			break;
		}
		else if (arg[0] == '-')
			usage(reflog_expire_usage);
		else
			break;
	}
	if (cb.stalefix) {
		init_revisions(&cb.revs, prefix);
		if (cb.verbose)
			printf("Marking reachable objects...");
		mark_reachable_objects(&cb.revs, 0);
		if (cb.verbose)
			putchar('\n');
	}

	if (do_all) {
		struct collect_reflog_cb collected;
		int i;

		memset(&collected, 0, sizeof(collected));
		for_each_reflog(collect_reflog, &collected);
		for (i = 0; i < collected.nr; i++) {
			struct collected_reflog *e = collected.e[i];
			status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
			free(e);
		}
		free(collected.e);
	}

	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;
}

/*
 * main "reflog"
 */

static const char reflog_usage[] =
"git-reflog (expire | ...)";

int cmd_reflog(int argc, const char **argv, const char *prefix)
{
	/* With no command, we default to showing it. */
	if (argc < 2 || *argv[1] == '-')
		return cmd_log_reflog(argc, argv, prefix);

	if (!strcmp(argv[1], "show"))
		return cmd_log_reflog(argc - 1, argv + 1, prefix);

	if (!strcmp(argv[1], "expire"))
		return cmd_reflog_expire(argc - 1, argv + 1, prefix);

	/* Not a recognized reflog command..*/
	usage(reflog_usage);
}
Commit	Line	Data
4264dc15 JH	1	#include "cache.h"
	2	#include "builtin.h"
	3	#include "commit.h"
	4	#include "refs.h"
	5	#include "dir.h"
8d8b9f62	6	#include "tree-walk.h"
1389d9dd JH	7	#include "diff.h"
	8	#include "revision.h"
	9	#include "reachable.h"
	10
	11	/*
	12	* reflog expire
	13	*/
	14
	15	static const char reflog_expire_usage[] =
cf39f54e	16	"git-reflog (show\|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
4264dc15	17
4aec56d1 JH	18	static unsigned long default_reflog_expire;
	19	static unsigned long default_reflog_expire_unreachable;
	20
1389d9dd JH	21	struct cmd_reflog_expire_cb {
	22	struct rev_info revs;
	23	int dry_run;
	24	int stalefix;
	25	int verbose;
	26	unsigned long expire_total;
	27	unsigned long expire_unreachable;
	28	};
	29
4264dc15 JH	30	struct expire_reflog_cb {
	31	FILE *newlog;
	32	const char *ref;
	33	struct commit *ref_commit;
1389d9dd	34	struct cmd_reflog_expire_cb *cmd;
4264dc15 JH	35	};
4264dc15 JH	36
bda3a31c JH	37	struct collected_reflog {
	38	unsigned char sha1[20];
	39	char reflog[FLEX_ARRAY];
	40	};
	41	struct collect_reflog_cb {
	42	struct collected_reflog **e;
	43	int alloc;
	44	int nr;
	45	};
	46
cd1f9c36 JH	47	#define INCOMPLETE (1u<<10)
	48	#define STUDYING (1u<<11)
	49
8d8b9f62 JH	50	static int tree_is_complete(const unsigned char *sha1)
	51	{
	52	struct tree_desc desc;
cd1f9c36 JH	53	struct name_entry entry;
	54	int complete;
	55	struct tree *tree;
8d8b9f62	56
cd1f9c36 JH	57	tree = lookup_tree(sha1);
cd1f9c36 JH	58	if (!tree)
8d8b9f62	59	return 0;
cd1f9c36 JH	60	if (tree->object.flags & SEEN)
	61	return 1;
	62	if (tree->object.flags & INCOMPLETE)
	63	return 0;
	64
6fda5e51	65	if (!tree->buffer) {
21666f1a	66	enum object_type type;
6fda5e51 LT	67	unsigned long size;
6fda5e51 LT	68	void *data = read_sha1_file(sha1, &type, &size);
cd1f9c36 JH	69	if (!data) {
cd1f9c36 JH	70	tree->object.flags \|= INCOMPLETE;
8d8b9f62 JH	71	return 0;
8d8b9f62 JH	72	}
cd1f9c36	73	tree->buffer = data;
6fda5e51	74	tree->size = size;
8d8b9f62	75	}
6fda5e51	76	init_tree_desc(&desc, tree->buffer, tree->size);
cd1f9c36 JH	77	complete = 1;
	78	while (tree_entry(&desc, &entry)) {
	79	if (!has_sha1_file(entry.sha1) \|\|
	80	(S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
	81	tree->object.flags \|= INCOMPLETE;
	82	complete = 0;
	83	}
	84	}
	85	free(tree->buffer);
	86	tree->buffer = NULL;
8d8b9f62	87
cd1f9c36 JH	88	if (complete)
	89	tree->object.flags \|= SEEN;
	90	return complete;
	91	}
1389d9dd JH	92
	93	static int commit_is_complete(struct commit *commit)
	94	{
	95	struct object_array study;
	96	struct object_array found;
	97	int is_incomplete = 0;
	98	int i;
	99
	100	/* early return */
	101	if (commit->object.flags & SEEN)
	102	return 1;
	103	if (commit->object.flags & INCOMPLETE)
	104	return 0;
	105	/*
	106	* Find all commits that are reachable and are not marked as
	107	* SEEN. Then make sure the trees and blobs contained are
	108	* complete. After that, mark these commits also as SEEN.
	109	* If some of the objects that are needed to complete this
	110	* commit are missing, mark this commit as INCOMPLETE.
	111	*/
	112	memset(&study, 0, sizeof(study));
	113	memset(&found, 0, sizeof(found));
	114	add_object_array(&commit->object, NULL, &study);
	115	add_object_array(&commit->object, NULL, &found);
	116	commit->object.flags \|= STUDYING;
	117	while (study.nr) {
	118	struct commit *c;
	119	struct commit_list *parent;
	120
	121	c = (struct commit *)study.objects[--study.nr].item;
	122	if (!c->object.parsed && !parse_object(c->object.sha1))
	123	c->object.flags \|= INCOMPLETE;
	124
	125	if (c->object.flags & INCOMPLETE) {
	126	is_incomplete = 1;
	127	break;
	128	}
	129	else if (c->object.flags & SEEN)
	130	continue;
	131	for (parent = c->parents; parent; parent = parent->next) {
	132	struct commit *p = parent->item;
	133	if (p->object.flags & STUDYING)
	134	continue;
	135	p->object.flags \|= STUDYING;
	136	add_object_array(&p->object, NULL, &study);
	137	add_object_array(&p->object, NULL, &found);
	138	}
	139	}
	140	if (!is_incomplete) {
cd1f9c36 JH	141	/*
cd1f9c36 JH	142	* make sure all commits in "found" array have all the
1389d9dd JH	143	* necessary objects.
1389d9dd JH	144	*/
cd1f9c36	145	for (i = 0; i < found.nr; i++) {
1389d9dd JH	146	struct commit *c =
1389d9dd JH	147	(struct commit *)found.objects[i].item;
cd1f9c36	148	if (!tree_is_complete(c->tree->object.sha1)) {
1389d9dd	149	is_incomplete = 1;
cd1f9c36 JH	150	c->object.flags \|= INCOMPLETE;
cd1f9c36 JH	151	}
1389d9dd JH	152	}
	153	if (!is_incomplete) {
	154	/* mark all found commits as complete, iow SEEN */
	155	for (i = 0; i < found.nr; i++)
	156	found.objects[i].item->flags \|= SEEN;
	157	}
	158	}
	159	/* clear flags from the objects we traversed */
	160	for (i = 0; i < found.nr; i++)
	161	found.objects[i].item->flags &= ~STUDYING;
	162	if (is_incomplete)
	163	commit->object.flags \|= INCOMPLETE;
cd1f9c36 JH	164	else {
	165	/*
	166	* If we come here, we have (1) traversed the ancestry chain
	167	* from the "commit" until we reach SEEN commits (which are
	168	* known to be complete), and (2) made sure that the commits
	169	* encountered during the above traversal refer to trees that
	170	* are complete. Which means that we know all the commits
	171	* we have seen during this process are complete.
	172	*/
	173	for (i = 0; i < found.nr; i++)
	174	found.objects[i].item->flags \|= SEEN;
	175	}
1389d9dd JH	176	/* free object arrays */
	177	free(study.objects);
	178	free(found.objects);
	179	return !is_incomplete;
	180	}
	181
4264dc15 JH	182	static int keep_entry(struct commit *it, unsigned char sha1)
4264dc15 JH	183	{
8d8b9f62 JH	184	struct commit *commit;
8d8b9f62 JH	185
4264dc15 JH	186	if (is_null_sha1(sha1))
4264dc15 JH	187	return 1;
8d8b9f62 JH	188	commit = lookup_commit_reference_gently(sha1, 1);
	189	if (!commit)
	190	return 0;
	191
1389d9dd JH	192	/*
	193	* Make sure everything in this commit exists.
	194	*
	195	* We have walked all the objects reachable from the refs
	196	* and cache earlier. The commits reachable by this commit
	197	* must meet SEEN commits -- and then we should mark them as
	198	* SEEN as well.
	199	*/
	200	if (!commit_is_complete(commit))
8d8b9f62 JH	201	return 0;
	202	*it = commit;
	203	return 1;
4264dc15 JH	204	}
	205
	206	static int expire_reflog_ent(unsigned char osha1, unsigned char nsha1,
883d60fa JS	207	const char *email, unsigned long timestamp, int tz,
883d60fa JS	208	const char message, void cb_data)
4264dc15 JH	209	{
4264dc15 JH	210	struct expire_reflog_cb *cb = cb_data;
4264dc15 JH	211	struct commit old, new;
4264dc15 JH	212
1389d9dd	213	if (timestamp < cb->cmd->expire_total)
4264dc15 JH	214	goto prune;
4264dc15 JH	215
9bbaa6cc	216	old = new = NULL;
1389d9dd JH	217	if (cb->cmd->stalefix &&
1389d9dd JH	218	(!keep_entry(&old, osha1) \|\| !keep_entry(&new, nsha1)))
4264dc15 JH	219	goto prune;
4264dc15 JH	220
9bbaa6cc JH	221	if (timestamp < cb->cmd->expire_unreachable) {
	222	if (!cb->ref_commit)
	223	goto prune;
	224	if (!old && !is_null_sha1(osha1))
	225	old = lookup_commit_reference_gently(osha1, 1);
	226	if (!new && !is_null_sha1(nsha1))
	227	new = lookup_commit_reference_gently(nsha1, 1);
4a164d48 JH	228	if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) \|\|
4a164d48 JH	229	(new && !in_merge_bases(new, &cb->ref_commit, 1)))
9bbaa6cc JH	230	goto prune;
9bbaa6cc JH	231	}
4264dc15	232
883d60fa JS	233	if (cb->newlog) {
	234	char sign = (tz < 0) ? '-' : '+';
	235	int zone = (tz < 0) ? (-tz) : tz;
	236	fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
	237	sha1_to_hex(osha1), sha1_to_hex(nsha1),
	238	email, timestamp, sign, zone,
	239	message);
	240	}
1389d9dd	241	if (cb->cmd->verbose)
883d60fa	242	printf("keep %s", message);
4264dc15 JH	243	return 0;
4264dc15 JH	244	prune:
1389d9dd	245	if (!cb->newlog \|\| cb->cmd->verbose)
883d60fa	246	printf("%sprune %s", cb->newlog ? "" : "would ", message);
4264dc15 JH	247	return 0;
	248	}
	249
4264dc15 JH	250	static int expire_reflog(const char ref, const unsigned char sha1, int unused, void *cb_data)
	251	{
	252	struct cmd_reflog_expire_cb *cmd = cb_data;
	253	struct expire_reflog_cb cb;
	254	struct ref_lock *lock;
9a13f0b7	255	char log_file, newlog_path = NULL;
4264dc15 JH	256	int status = 0;
4264dc15 JH	257
4264dc15 JH	258	memset(&cb, 0, sizeof(cb));
	259	/* we take the lock for the ref itself to prevent it from
	260	* getting updated.
	261	*/
68db31cc	262	lock = lock_any_ref_for_update(ref, sha1, 0);
4264dc15 JH	263	if (!lock)
4264dc15 JH	264	return error("cannot lock ref '%s'", ref);
9a13f0b7 NP	265	log_file = xstrdup(git_path("logs/%s", ref));
9a13f0b7 NP	266	if (!file_exists(log_file))
4264dc15 JH	267	goto finish;
	268	if (!cmd->dry_run) {
	269	newlog_path = xstrdup(git_path("logs/%s.lock", ref));
	270	cb.newlog = fopen(newlog_path, "w");
	271	}
	272
	273	cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
4264dc15	274	cb.ref = ref;
1389d9dd	275	cb.cmd = cmd;
4264dc15 JH	276	for_each_reflog_ent(ref, expire_reflog_ent, &cb);
	277	finish:
	278	if (cb.newlog) {
	279	if (fclose(cb.newlog))
	280	status \|= error("%s: %s", strerror(errno),
	281	newlog_path);
9a13f0b7	282	if (rename(newlog_path, log_file)) {
4264dc15	283	status \|= error("cannot rename %s to %s",
9a13f0b7	284	newlog_path, log_file);
4264dc15 JH	285	unlink(newlog_path);
	286	}
	287	}
	288	free(newlog_path);
9a13f0b7	289	free(log_file);
4264dc15 JH	290	unlock_ref(lock);
	291	return status;
	292	}
	293
bda3a31c JH	294	static int collect_reflog(const char ref, const unsigned char sha1, int unused, void *cb_data)
	295	{
	296	struct collected_reflog *e;
	297	struct collect_reflog_cb *cb = cb_data;
	298	size_t namelen = strlen(ref);
	299
	300	e = xmalloc(sizeof(*e) + namelen + 1);
	301	hashcpy(e->sha1, sha1);
	302	memcpy(e->reflog, ref, namelen + 1);
	303	ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
	304	cb->e[cb->nr++] = e;
	305	return 0;
	306	}
	307
4aec56d1 JH	308	static int reflog_expire_config(const char var, const char value)
	309	{
	310	if (!strcmp(var, "gc.reflogexpire"))
	311	default_reflog_expire = approxidate(value);
	312	else if (!strcmp(var, "gc.reflogexpireunreachable"))
	313	default_reflog_expire_unreachable = approxidate(value);
	314	else
	315	return git_default_config(var, value);
	316	return 0;
	317	}
	318
4264dc15 JH	319	static int cmd_reflog_expire(int argc, const char *argv, const char prefix)
	320	{
	321	struct cmd_reflog_expire_cb cb;
	322	unsigned long now = time(NULL);
	323	int i, status, do_all;
	324
4aec56d1 JH	325	git_config(reflog_expire_config);
4aec56d1 JH	326
4264dc15 JH	327	save_commit_buffer = 0;
	328	do_all = status = 0;
	329	memset(&cb, 0, sizeof(cb));
4aec56d1 JH	330
	331	if (!default_reflog_expire_unreachable)
	332	default_reflog_expire_unreachable = now - 30 * 24 * 3600;
	333	if (!default_reflog_expire)
	334	default_reflog_expire = now - 90 * 24 * 3600;
	335	cb.expire_total = default_reflog_expire;
	336	cb.expire_unreachable = default_reflog_expire_unreachable;
4264dc15	337
1389d9dd JH	338	/*
	339	* We can trust the commits and objects reachable from refs
	340	* even in older repository. We cannot trust what's reachable
	341	* from reflog if the repository was pruned with older git.
	342	*/
	343
4264dc15 JH	344	for (i = 1; i < argc; i++) {
	345	const char *arg = argv[i];
	346	if (!strcmp(arg, "--dry-run") \|\| !strcmp(arg, "-n"))
	347	cb.dry_run = 1;
cc44c765	348	else if (!prefixcmp(arg, "--expire="))
4264dc15	349	cb.expire_total = approxidate(arg + 9);
cc44c765	350	else if (!prefixcmp(arg, "--expire-unreachable="))
4264dc15	351	cb.expire_unreachable = approxidate(arg + 21);
1389d9dd JH	352	else if (!strcmp(arg, "--stale-fix"))
1389d9dd JH	353	cb.stalefix = 1;
4264dc15 JH	354	else if (!strcmp(arg, "--all"))
4264dc15 JH	355	do_all = 1;
1389d9dd JH	356	else if (!strcmp(arg, "--verbose"))
1389d9dd JH	357	cb.verbose = 1;
4264dc15 JH	358	else if (!strcmp(arg, "--")) {
	359	i++;
	360	break;
	361	}
	362	else if (arg[0] == '-')
	363	usage(reflog_expire_usage);
	364	else
	365	break;
	366	}
1389d9dd JH	367	if (cb.stalefix) {
	368	init_revisions(&cb.revs, prefix);
	369	if (cb.verbose)
	370	printf("Marking reachable objects...");
	371	mark_reachable_objects(&cb.revs, 0);
	372	if (cb.verbose)
	373	putchar('\n');
	374	}
	375
bda3a31c JH	376	if (do_all) {
	377	struct collect_reflog_cb collected;
	378	int i;
	379
	380	memset(&collected, 0, sizeof(collected));
	381	for_each_reflog(collect_reflog, &collected);
	382	for (i = 0; i < collected.nr; i++) {
	383	struct collected_reflog *e = collected.e[i];
	384	status \|= expire_reflog(e->reflog, e->sha1, 0, &cb);
	385	free(e);
	386	}
	387	free(collected.e);
	388	}
	389
4264dc15 JH	390	while (i < argc) {
	391	const char *ref = argv[i++];
	392	unsigned char sha1[20];
	393	if (!resolve_ref(ref, sha1, 1, NULL)) {
	394	status \|= error("%s points nowhere!", ref);
	395	continue;
	396	}
	397	status \|= expire_reflog(ref, sha1, 0, &cb);
	398	}
	399	return status;
	400	}
	401
1389d9dd JH	402	/*
	403	* main "reflog"
	404	*/
	405
4264dc15 JH	406	static const char reflog_usage[] =
	407	"git-reflog (expire \| ...)";
	408
	409	int cmd_reflog(int argc, const char *argv, const char prefix)
	410	{
cf39f54e LT	411	/* With no command, we default to showing it. */
	412	if (argc < 2 \|\| *argv[1] == '-')
	413	return cmd_log_reflog(argc, argv, prefix);
	414
	415	if (!strcmp(argv[1], "show"))
	416	return cmd_log_reflog(argc - 1, argv + 1, prefix);
	417
	418	if (!strcmp(argv[1], "expire"))
4264dc15	419	return cmd_reflog_expire(argc - 1, argv + 1, prefix);
cf39f54e LT	420
	421	/* Not a recognized reflog command..*/
	422	usage(reflog_usage);
4264dc15	423	}