[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"

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;

	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)) {
				report_missing(obj);
				return -1;
			}
		}
		if (!obj->type)
			parse_object(the_repository, &obj->oid);
		if (process_object(walker, obj))
			return -1;
	}
	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 = xmalloc(targets * sizeof(struct object_id));
	char *msg = NULL;
	int i, ret = -1;

	save_commit_buffer = 0;

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