[thirdparty/git.git] / walker.c

#include "cache.h"
#include "walker.h"
#include "repository.h"
#include "object-store.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"
#include "progress.h"

static struct object_id current_commit_oid;

void walker_say(struct walker *walker, const char *fmt, ...)
{
	if (walker->get_verbosely) {
		va_list ap;
		va_start(ap, fmt);
		vfprintf(stderr, fmt, ap);
		va_end(ap);
	}
}

static void report_missing(const struct object *obj)
{
	fprintf(stderr, "Cannot obtain needed %s %s\n",
		obj->type ? type_name(obj->type): "object",
		oid_to_hex(&obj->oid));
	if (!is_null_oid(&current_commit_oid))
		fprintf(stderr, "while processing commit %s.\n",
			oid_to_hex(&current_commit_oid));
}

static int process(struct walker *walker, struct object *obj);

static int process_tree(struct walker *walker, struct tree *tree)
{
	struct tree_desc desc;
	struct name_entry entry;

	if (parse_tree(tree))
		return -1;

	init_tree_desc(&desc, tree->buffer, tree->size);
	while (tree_entry(&desc, &entry)) {
		struct object *obj = NULL;

		/* submodule commits are not stored in the superproject */
		if (S_ISGITLINK(entry.mode))
			continue;
		if (S_ISDIR(entry.mode)) {
			struct tree *tree = lookup_tree(the_repository,
							&entry.oid);
			if (tree)
				obj = &tree->object;
		}
		else {
			struct blob *blob = lookup_blob(the_repository,
							&entry.oid);
			if (blob)
				obj = &blob->object;
		}
		if (!obj || process(walker, obj))
			return -1;
	}
	free_tree_buffer(tree);
	return 0;
}

/* Remember to update object flag allocation in object.h */
#define COMPLETE	(1U << 0)
#define SEEN		(1U << 1)
#define TO_SCAN		(1U << 2)

static struct commit_list *complete = NULL;

static int process_commit(struct walker *walker, struct commit *commit)
{
	struct commit_list *parents;

	if (parse_commit(commit))
		return -1;

	while (complete && complete->item->date >= commit->date) {
		pop_most_recent_commit(&complete, COMPLETE);
	}

	if (commit->object.flags & COMPLETE)
		return 0;

	oidcpy(&current_commit_oid, &commit->object.oid);

	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));

	if (process(walker, &get_commit_tree(commit)->object))
		return -1;

	for (parents = commit->parents; parents; parents = parents->next) {
		if (process(walker, &parents->item->object))
			return -1;
	}

	return 0;
}

static int process_tag(struct walker *walker, struct tag *tag)
{
	if (parse_tag(tag))
		return -1;
	return process(walker, tag->tagged);
}

static struct object_list *process_queue = NULL;
static struct object_list **process_queue_end = &process_queue;

static int process_object(struct walker *walker, struct object *obj)
{
	if (obj->type == OBJ_COMMIT) {
		if (process_commit(walker, (struct commit *)obj))
			return -1;
		return 0;
	}
	if (obj->type == OBJ_TREE) {
		if (process_tree(walker, (struct tree *)obj))
			return -1;
		return 0;
	}
	if (obj->type == OBJ_BLOB) {
		return 0;
	}
	if (obj->type == OBJ_TAG) {
		if (process_tag(walker, (struct tag *)obj))
			return -1;
		return 0;
	}
	return error("Unable to determine requirements "
		     "of type %s for %s",
		     type_name(obj->type), oid_to_hex(&obj->oid));
}

static int process(struct walker *walker, struct object *obj)
{
	if (obj->flags & SEEN)
		return 0;
	obj->flags |= SEEN;

	if (has_object_file(&obj->oid)) {
		/* We already have it, so we should scan it now. */
		obj->flags |= TO_SCAN;
	}
	else {
		if (obj->flags & COMPLETE)
			return 0;
		walker->prefetch(walker, obj->oid.hash);
	}

	object_list_insert(obj, process_queue_end);
	process_queue_end = &(*process_queue_end)->next;
	return 0;
}

static int loop(struct walker *walker)
{
	struct object_list *elem;
	struct progress *progress = NULL;
	uint64_t nr = 0;

	if (walker->get_progress)
		progress = start_delayed_progress(_("Fetching objects"), 0);

	while (process_queue) {
		struct object *obj = process_queue->item;
		elem = process_queue;
		process_queue = elem->next;
		free(elem);
		if (!process_queue)
			process_queue_end = &process_queue;

		/* If we are not scanning this object, we placed it in
		 * the queue because we needed to fetch it first.
		 */
		if (! (obj->flags & TO_SCAN)) {
			if (walker->fetch(walker, obj->oid.hash)) {
				stop_progress(&progress);
				report_missing(obj);
				return -1;
			}
		}
		if (!obj->type)
			parse_object(the_repository, &obj->oid);
		if (process_object(walker, obj)) {
			stop_progress(&progress);
			return -1;
		}
		display_progress(progress, ++nr);
	}
	stop_progress(&progress);
	return 0;
}

static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
{
	if (!get_oid_hex(target, oid))
		return 0;
	if (!check_refname_format(target, 0)) {
		struct ref *ref = alloc_ref(target);
		if (!walker->fetch_ref(walker, ref)) {
			oidcpy(oid, &ref->old_oid);
			free(ref);
			return 0;
		}
		free(ref);
	}
	return -1;
}

static int mark_complete(const char *path, const struct object_id *oid,
			 int flag, void *cb_data)
{
	struct commit *commit = lookup_commit_reference_gently(the_repository,
							       oid, 1);

	if (commit) {
		commit->object.flags |= COMPLETE;
		commit_list_insert(commit, &complete);
	}
	return 0;
}

int walker_targets_stdin(char ***target, const char ***write_ref)
{
	int targets = 0, targets_alloc = 0;
	struct strbuf buf = STRBUF_INIT;
	*target = NULL; *write_ref = NULL;
	while (1) {
		char *rf_one = NULL;
		char *tg_one;

		if (strbuf_getline_lf(&buf, stdin) == EOF)
			break;
		tg_one = buf.buf;
		rf_one = strchr(tg_one, '\t');
		if (rf_one)
			*rf_one++ = 0;

		if (targets >= targets_alloc) {
			targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
			REALLOC_ARRAY(*target, targets_alloc);
			REALLOC_ARRAY(*write_ref, targets_alloc);
		}
		(*target)[targets] = xstrdup(tg_one);
		(*write_ref)[targets] = xstrdup_or_null(rf_one);
		targets++;
	}
	strbuf_release(&buf);
	return targets;
}

void walker_targets_free(int targets, char **target, const char **write_ref)
{
	while (targets--) {
		free(target[targets]);
		if (write_ref)
			free((char *) write_ref[targets]);
	}
}

int walker_fetch(struct walker *walker, int targets, char **target,
		 const char **write_ref, const char *write_ref_log_details)
{
	struct strbuf refname = STRBUF_INIT;
	struct strbuf err = STRBUF_INIT;
	struct ref_transaction *transaction = NULL;
	struct object_id *oids;
	char *msg = NULL;
	int i, ret = -1;

	save_commit_buffer = 0;

	ALLOC_ARRAY(oids, targets);

	if (write_ref) {
		transaction = ref_transaction_begin(&err);
		if (!transaction) {
			error("%s", err.buf);
			goto done;
		}
	}

	if (!walker->get_recover) {
		for_each_ref(mark_complete, NULL);
		commit_list_sort_by_date(&complete);
	}

	for (i = 0; i < targets; i++) {
		if (interpret_target(walker, target[i], oids + i)) {
			error("Could not interpret response from server '%s' as something to pull", target[i]);
			goto done;
		}
		if (process(walker, lookup_unknown_object(&oids[i])))
			goto done;
	}

	if (loop(walker))
		goto done;
	if (!write_ref) {
		ret = 0;
		goto done;
	}
	if (write_ref_log_details) {
		msg = xstrfmt("fetch from %s", write_ref_log_details);
	} else {
		msg = NULL;
	}
	for (i = 0; i < targets; i++) {
		if (!write_ref[i])
			continue;
		strbuf_reset(&refname);
		strbuf_addf(&refname, "refs/%s", write_ref[i]);
		if (ref_transaction_update(transaction, refname.buf,
					   oids + i, NULL, 0,
					   msg ? msg : "fetch (unknown)",
					   &err)) {
			error("%s", err.buf);
			goto done;
		}
	}
	if (ref_transaction_commit(transaction, &err)) {
		error("%s", err.buf);
		goto done;
	}

	ret = 0;

done:
	ref_transaction_free(transaction);
	free(msg);
	free(oids);
	strbuf_release(&err);
	strbuf_release(&refname);
	return ret;
}

void walker_free(struct walker *walker)
{
	walker->cleanup(walker);
	free(walker);
}
Commit	Line	Data
4250a5e5	1	#include "cache.h"
30ae764b	2	#include "walker.h"
109cd76d	3	#include "repository.h"
cbd53a21	4	#include "object-store.h"
4250a5e5 DB	5	#include "commit.h"
4250a5e5 DB	6	#include "tree.h"
1bc995a3	7	#include "tree-walk.h"
3173bd49 DB	8	#include "tag.h"
3173bd49 DB	9	#include "blob.h"
cd541a68	10	#include "refs.h"
7655b411	11	#include "progress.h"
cd541a68	12
94f5a121	13	static struct object_id current_commit_oid;
4250a5e5	14
fa262cac	15	void walker_say(struct walker walker, const char fmt, ...)
1e8be59d	16	{
fa262cac JK	17	if (walker->get_verbosely) {
	18	va_list ap;
	19	va_start(ap, fmt);
	20	vfprintf(stderr, fmt, ap);
	21	va_end(ap);
	22	}
e78d9772 JH	23	}
e78d9772 JH	24
0d7a6e4e	25	static void report_missing(const struct object *obj)
b2d62f16	26	{
0d7a6e4e	27	fprintf(stderr, "Cannot obtain needed %s %s\n",
debca9d2	28	obj->type ? type_name(obj->type): "object",
f2fd0760	29	oid_to_hex(&obj->oid));
94f5a121	30	if (!is_null_oid(&current_commit_oid))
0d7a6e4e	31	fprintf(stderr, "while processing commit %s.\n",
94f5a121	32	oid_to_hex(&current_commit_oid));
b2d62f16 JH	33	}
b2d62f16 JH	34
30ae764b	35	static int process(struct walker walker, struct object obj);
3173bd49	36
30ae764b	37	static int process_tree(struct walker walker, struct tree tree)
4250a5e5	38	{
1bc995a3	39	struct tree_desc desc;
4c068a98	40	struct name_entry entry;
4250a5e5 DB	41
	42	if (parse_tree(tree))
	43	return -1;
	44
6fda5e51	45	init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98	46	while (tree_entry(&desc, &entry)) {
6f9012b6 JH	47	struct object *obj = NULL;
6f9012b6 JH	48
582c7393	49	/* submodule commits are not stored in the superproject */
68fb4650	50	if (S_ISGITLINK(entry.mode))
582c7393	51	continue;
4c068a98	52	if (S_ISDIR(entry.mode)) {
f86bcc7b	53	struct tree *tree = lookup_tree(the_repository,
ea82b2a0	54	&entry.oid);
6f9012b6 JH	55	if (tree)
	56	obj = &tree->object;
	57	}
	58	else {
da14a7ff	59	struct blob *blob = lookup_blob(the_repository,
ea82b2a0	60	&entry.oid);
6f9012b6 JH	61	if (blob)
6f9012b6 JH	62	obj = &blob->object;
2d9c58c6	63	}
30ae764b	64	if (!obj \|\| process(walker, obj))
4250a5e5	65	return -1;
4250a5e5	66	}
6e454b9a	67	free_tree_buffer(tree);
4250a5e5 DB	68	return 0;
	69	}
	70
208acbfb	71	/* Remember to update object flag allocation in object.h */
24451c31 SV	72	#define COMPLETE (1U << 0)
	73	#define SEEN (1U << 1)
	74	#define TO_SCAN (1U << 2)
85d106c2	75
d0ac30f2	76	static struct commit_list *complete = NULL;
22c6e1d0	77
30ae764b	78	static int process_commit(struct walker walker, struct commit commit)
4250a5e5	79	{
0b6b3429 MÅ	80	struct commit_list *parents;
0b6b3429 MÅ	81
1e8be59d	82	if (parse_commit(commit))
4250a5e5 DB	83	return -1;
4250a5e5 DB	84
22c6e1d0	85	while (complete && complete->item->date >= commit->date) {
d0ac30f2	86	pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0	87	}
22c6e1d0	88
d0ac30f2	89	if (commit->object.flags & COMPLETE)
22c6e1d0 DB	90	return 0;
22c6e1d0 DB	91
94f5a121	92	oidcpy(&current_commit_oid, &commit->object.oid);
4250a5e5	93
f2fd0760	94	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
85d106c2	95
c89b6e13	96	if (process(walker, &get_commit_tree(commit)->object))
0b6b3429 MÅ	97	return -1;
	98
	99	for (parents = commit->parents; parents; parents = parents->next) {
	100	if (process(walker, &parents->item->object))
4250a5e5	101	return -1;
4250a5e5	102	}
0b6b3429	103
4250a5e5 DB	104	return 0;
	105	}
	106
30ae764b	107	static int process_tag(struct walker walker, struct tag tag)
3173bd49	108	{
1e8be59d	109	if (parse_tag(tag))
3173bd49	110	return -1;
30ae764b	111	return process(walker, tag->tagged);
3173bd49 DB	112	}
3173bd49 DB	113
1e8be59d DB	114	static struct object_list *process_queue = NULL;
	115	static struct object_list **process_queue_end = &process_queue;
	116
30ae764b	117	static int process_object(struct walker walker, struct object obj)
3173bd49	118	{
1974632c	119	if (obj->type == OBJ_COMMIT) {
30ae764b	120	if (process_commit(walker, (struct commit *)obj))
f88fcf8b DB	121	return -1;
	122	return 0;
	123	}
1974632c	124	if (obj->type == OBJ_TREE) {
30ae764b	125	if (process_tree(walker, (struct tree *)obj))
f88fcf8b DB	126	return -1;
	127	return 0;
	128	}
1974632c	129	if (obj->type == OBJ_BLOB) {
f88fcf8b DB	130	return 0;
f88fcf8b DB	131	}
1974632c	132	if (obj->type == OBJ_TAG) {
30ae764b	133	if (process_tag(walker, (struct tag *)obj))
f88fcf8b	134	return -1;
3173bd49	135	return 0;
f88fcf8b DB	136	}
	137	return error("Unable to determine requirements "
	138	"of type %s for %s",
debca9d2	139	type_name(obj->type), oid_to_hex(&obj->oid));
f88fcf8b DB	140	}
f88fcf8b DB	141
30ae764b	142	static int process(struct walker walker, struct object obj)
f88fcf8b	143	{
a82d07e5 SV	144	if (obj->flags & SEEN)
	145	return 0;
	146	obj->flags \|= SEEN;
	147
f2fd0760	148	if (has_object_file(&obj->oid)) {
f88fcf8b	149	/* We already have it, so we should scan it now. */
85d106c2	150	obj->flags \|= TO_SCAN;
e5f38ec3 JH	151	}
e5f38ec3 JH	152	else {
7b64d06b SV	153	if (obj->flags & COMPLETE)
7b64d06b SV	154	return 0;
ed1c9977	155	walker->prefetch(walker, obj->oid.hash);
f88fcf8b	156	}
a6080a0a	157
1e8be59d DB	158	object_list_insert(obj, process_queue_end);
1e8be59d DB	159	process_queue_end = &(*process_queue_end)->next;
1e8be59d DB	160	return 0;
	161	}
	162
30ae764b	163	static int loop(struct walker *walker)
1e8be59d	164	{
85d106c2	165	struct object_list *elem;
7655b411 RS	166	struct progress *progress = NULL;
	167	uint64_t nr = 0;
	168
	169	if (walker->get_progress)
	170	progress = start_delayed_progress(_("Fetching objects"), 0);
85d106c2	171
1e8be59d DB	172	while (process_queue) {
1e8be59d DB	173	struct object *obj = process_queue->item;
85d106c2 JH	174	elem = process_queue;
	175	process_queue = elem->next;
	176	free(elem);
1e8be59d DB	177	if (!process_queue)
	178	process_queue_end = &process_queue;
	179
85d106c2 JH	180	/* If we are not scanning this object, we placed it in
	181	* the queue because we needed to fetch it first.
	182	*/
	183	if (! (obj->flags & TO_SCAN)) {
ed1c9977	184	if (walker->fetch(walker, obj->oid.hash)) {
7655b411	185	stop_progress(&progress);
0d7a6e4e	186	report_missing(obj);
85d106c2 JH	187	return -1;
	188	}
	189	}
1e8be59d	190	if (!obj->type)
109cd76d	191	parse_object(the_repository, &obj->oid);
7655b411 RS	192	if (process_object(walker, obj)) {
7655b411 RS	193	stop_progress(&progress);
f88fcf8b	194	return -1;
7655b411 RS	195	}
7655b411 RS	196	display_progress(progress, ++nr);
1e8be59d	197	}
7655b411	198	stop_progress(&progress);
1e8be59d	199	return 0;
3173bd49 DB	200	}
3173bd49 DB	201
94f5a121	202	static int interpret_target(struct walker walker, char target, struct object_id *oid)
cd541a68	203	{
94f5a121	204	if (!get_oid_hex(target, oid))
cd541a68	205	return 0;
8d9c5010	206	if (!check_refname_format(target, 0)) {
59c69c0c	207	struct ref *ref = alloc_ref(target);
c13b2633	208	if (!walker->fetch_ref(walker, ref)) {
94f5a121	209	oidcpy(oid, &ref->old_oid);
c13b2633	210	free(ref);
cd541a68 DB	211	return 0;
cd541a68 DB	212	}
c13b2633	213	free(ref);
cd541a68 DB	214	}
	215	return -1;
	216	}
	217
b4ebaf9e MH	218	static int mark_complete(const char path, const struct object_id oid,
b4ebaf9e MH	219	int flag, void *cb_data)
22c6e1d0	220	{
21e1ee8f SB	221	struct commit *commit = lookup_commit_reference_gently(the_repository,
21e1ee8f SB	222	oid, 1);
b4ebaf9e	223
d0ac30f2 JH	224	if (commit) {
d0ac30f2 JH	225	commit->object.flags \|= COMPLETE;
3bc7a05b	226	commit_list_insert(commit, &complete);
22c6e1d0 DB	227	}
	228	return 0;
	229	}
cd541a68	230
30ae764b	231	int walker_targets_stdin(char *target, const char *write_ref)
8e87ca66 PB	232	{
8e87ca66 PB	233	int targets = 0, targets_alloc = 0;
f285a2d7	234	struct strbuf buf = STRBUF_INIT;
8e87ca66	235	target = NULL; write_ref = NULL;
8e87ca66 PB	236	while (1) {
	237	char *rf_one = NULL;
	238	char *tg_one;
	239
8f309aeb	240	if (strbuf_getline_lf(&buf, stdin) == EOF)
8e87ca66 PB	241	break;
	242	tg_one = buf.buf;
	243	rf_one = strchr(tg_one, '\t');
	244	if (rf_one)
	245	*rf_one++ = 0;
	246
	247	if (targets >= targets_alloc) {
	248	targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
2756ca43 RS	249	REALLOC_ARRAY(*target, targets_alloc);
2756ca43 RS	250	REALLOC_ARRAY(*write_ref, targets_alloc);
8e87ca66	251	}
9befac47	252	(*target)[targets] = xstrdup(tg_one);
8c53f071	253	(*write_ref)[targets] = xstrdup_or_null(rf_one);
8e87ca66 PB	254	targets++;
8e87ca66 PB	255	}
e6c019d0	256	strbuf_release(&buf);
8e87ca66 PB	257	return targets;
	258	}
	259
30ae764b	260	void walker_targets_free(int targets, char target, const char write_ref)
8e87ca66 PB	261	{
	262	while (targets--) {
	263	free(target[targets]);
24deea52	264	if (write_ref)
8e87ca66 PB	265	free((char *) write_ref[targets]);
	266	}
	267	}
	268
30ae764b DB	269	int walker_fetch(struct walker walker, int targets, char *target,
30ae764b DB	270	const char *write_ref, const char write_ref_log_details)
4250a5e5	271	{
b6b10bb4 RS	272	struct strbuf refname = STRBUF_INIT;
	273	struct strbuf err = STRBUF_INIT;
	274	struct ref_transaction *transaction = NULL;
667b76ec	275	struct object_id *oids;
b6b10bb4 RS	276	char *msg = NULL;
b6b10bb4 RS	277	int i, ret = -1;
cd541a68	278
98533b90	279	save_commit_buffer = 0;
4211e4d1	280
667b76ec JK	281	ALLOC_ARRAY(oids, targets);
667b76ec JK	282
b6b10bb4 RS	283	if (write_ref) {
	284	transaction = ref_transaction_begin(&err);
	285	if (!transaction) {
	286	error("%s", err.buf);
	287	goto done;
d0740d92	288	}
cd541a68 DB	289	}
cd541a68 DB	290
3bc7a05b	291	if (!walker->get_recover) {
b4ebaf9e	292	for_each_ref(mark_complete, NULL);
3bc7a05b RS	293	commit_list_sort_by_date(&complete);
3bc7a05b RS	294	}
22c6e1d0	295
4211e4d1	296	for (i = 0; i < targets; i++) {
94f5a121	297	if (interpret_target(walker, target[i], oids + i)) {
5f48741a	298	error("Could not interpret response from server '%s' as something to pull", target[i]);
b6b10bb4	299	goto done;
4211e4d1	300	}
0ebbcf70	301	if (process(walker, lookup_unknown_object(&oids[i])))
b6b10bb4	302	goto done;
4bd18c43	303	}
4211e4d1	304
30ae764b	305	if (loop(walker))
b6b10bb4 RS	306	goto done;
	307	if (!write_ref) {
	308	ret = 0;
	309	goto done;
	310	}
4211e4d1	311	if (write_ref_log_details) {
01d678a2	312	msg = xstrfmt("fetch from %s", write_ref_log_details);
4211e4d1 PB	313	} else {
4211e4d1 PB	314	msg = NULL;
4bd18c43	315	}
4211e4d1	316	for (i = 0; i < targets; i++) {
b6b10bb4	317	if (!write_ref[i])
4211e4d1	318	continue;
b6b10bb4 RS	319	strbuf_reset(&refname);
	320	strbuf_addf(&refname, "refs/%s", write_ref[i]);
	321	if (ref_transaction_update(transaction, refname.buf,
89f3bbdd	322	oids + i, NULL, 0,
db7516ab	323	msg ? msg : "fetch (unknown)",
b6b10bb4 RS	324	&err)) {
	325	error("%s", err.buf);
	326	goto done;
	327	}
	328	}
db7516ab	329	if (ref_transaction_commit(transaction, &err)) {
b6b10bb4 RS	330	error("%s", err.buf);
b6b10bb4 RS	331	goto done;
4bd18c43	332	}
4211e4d1	333
b6b10bb4	334	ret = 0;
30ae764b	335
b6b10bb4 RS	336	done:
	337	ref_transaction_free(transaction);
	338	free(msg);
94f5a121	339	free(oids);
b6b10bb4 RS	340	strbuf_release(&err);
	341	strbuf_release(&refname);
	342	return ret;
4250a5e5	343	}
30ae764b DB	344
	345	void walker_free(struct walker *walker)
	346	{
	347	walker->cleanup(walker);
	348	free(walker);
	349	}