[thirdparty/git.git] / walker.c

#include "cache.h"
#include "walker.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(entry.oid);
			if (tree)
				obj = &tree->object;
		}
		else {
			struct blob *blob = lookup_blob(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, &commit->tree->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(&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(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].hash)))
			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"
4250a5e5 DB	3	#include "commit.h"
4250a5e5 DB	4	#include "tree.h"
1bc995a3	5	#include "tree-walk.h"
3173bd49 DB	6	#include "tag.h"
3173bd49 DB	7	#include "blob.h"
cd541a68 DB	8	#include "refs.h"
cd541a68 DB	9
94f5a121	10	static struct object_id current_commit_oid;
4250a5e5	11
fa262cac	12	void walker_say(struct walker walker, const char fmt, ...)
1e8be59d	13	{
fa262cac JK	14	if (walker->get_verbosely) {
	15	va_list ap;
	16	va_start(ap, fmt);
	17	vfprintf(stderr, fmt, ap);
	18	va_end(ap);
	19	}
e78d9772 JH	20	}
e78d9772 JH	21
0d7a6e4e	22	static void report_missing(const struct object *obj)
b2d62f16	23	{
0d7a6e4e	24	fprintf(stderr, "Cannot obtain needed %s %s\n",
debca9d2	25	obj->type ? type_name(obj->type): "object",
f2fd0760	26	oid_to_hex(&obj->oid));
94f5a121	27	if (!is_null_oid(&current_commit_oid))
0d7a6e4e	28	fprintf(stderr, "while processing commit %s.\n",
94f5a121	29	oid_to_hex(&current_commit_oid));
b2d62f16 JH	30	}
b2d62f16 JH	31
30ae764b	32	static int process(struct walker walker, struct object obj);
3173bd49	33
30ae764b	34	static int process_tree(struct walker walker, struct tree tree)
4250a5e5	35	{
1bc995a3	36	struct tree_desc desc;
4c068a98	37	struct name_entry entry;
4250a5e5 DB	38
	39	if (parse_tree(tree))
	40	return -1;
	41
6fda5e51	42	init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98	43	while (tree_entry(&desc, &entry)) {
6f9012b6 JH	44	struct object *obj = NULL;
6f9012b6 JH	45
582c7393	46	/* submodule commits are not stored in the superproject */
68fb4650	47	if (S_ISGITLINK(entry.mode))
582c7393	48	continue;
4c068a98	49	if (S_ISDIR(entry.mode)) {
740ee055	50	struct tree *tree = lookup_tree(entry.oid);
6f9012b6 JH	51	if (tree)
	52	obj = &tree->object;
	53	}
	54	else {
3aca1fc6	55	struct blob *blob = lookup_blob(entry.oid);
6f9012b6 JH	56	if (blob)
6f9012b6 JH	57	obj = &blob->object;
2d9c58c6	58	}
30ae764b	59	if (!obj \|\| process(walker, obj))
4250a5e5	60	return -1;
4250a5e5	61	}
6e454b9a	62	free_tree_buffer(tree);
4250a5e5 DB	63	return 0;
	64	}
	65
208acbfb	66	/* Remember to update object flag allocation in object.h */
24451c31 SV	67	#define COMPLETE (1U << 0)
	68	#define SEEN (1U << 1)
	69	#define TO_SCAN (1U << 2)
85d106c2	70
d0ac30f2	71	static struct commit_list *complete = NULL;
22c6e1d0	72
30ae764b	73	static int process_commit(struct walker walker, struct commit commit)
4250a5e5	74	{
0b6b3429 MÅ	75	struct commit_list *parents;
0b6b3429 MÅ	76
1e8be59d	77	if (parse_commit(commit))
4250a5e5 DB	78	return -1;
4250a5e5 DB	79
22c6e1d0	80	while (complete && complete->item->date >= commit->date) {
d0ac30f2	81	pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0	82	}
22c6e1d0	83
d0ac30f2	84	if (commit->object.flags & COMPLETE)
22c6e1d0 DB	85	return 0;
22c6e1d0 DB	86
94f5a121	87	oidcpy(&current_commit_oid, &commit->object.oid);
4250a5e5	88
f2fd0760	89	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
85d106c2	90
0b6b3429 MÅ	91	if (process(walker, &commit->tree->object))
	92	return -1;
	93
	94	for (parents = commit->parents; parents; parents = parents->next) {
	95	if (process(walker, &parents->item->object))
4250a5e5	96	return -1;
4250a5e5	97	}
0b6b3429	98
4250a5e5 DB	99	return 0;
	100	}
	101
30ae764b	102	static int process_tag(struct walker walker, struct tag tag)
3173bd49	103	{
1e8be59d	104	if (parse_tag(tag))
3173bd49	105	return -1;
30ae764b	106	return process(walker, tag->tagged);
3173bd49 DB	107	}
3173bd49 DB	108
1e8be59d DB	109	static struct object_list *process_queue = NULL;
	110	static struct object_list **process_queue_end = &process_queue;
	111
30ae764b	112	static int process_object(struct walker walker, struct object obj)
3173bd49	113	{
1974632c	114	if (obj->type == OBJ_COMMIT) {
30ae764b	115	if (process_commit(walker, (struct commit *)obj))
f88fcf8b DB	116	return -1;
	117	return 0;
	118	}
1974632c	119	if (obj->type == OBJ_TREE) {
30ae764b	120	if (process_tree(walker, (struct tree *)obj))
f88fcf8b DB	121	return -1;
	122	return 0;
	123	}
1974632c	124	if (obj->type == OBJ_BLOB) {
f88fcf8b DB	125	return 0;
f88fcf8b DB	126	}
1974632c	127	if (obj->type == OBJ_TAG) {
30ae764b	128	if (process_tag(walker, (struct tag *)obj))
f88fcf8b	129	return -1;
3173bd49	130	return 0;
f88fcf8b DB	131	}
	132	return error("Unable to determine requirements "
	133	"of type %s for %s",
debca9d2	134	type_name(obj->type), oid_to_hex(&obj->oid));
f88fcf8b DB	135	}
f88fcf8b DB	136
30ae764b	137	static int process(struct walker walker, struct object obj)
f88fcf8b	138	{
a82d07e5 SV	139	if (obj->flags & SEEN)
	140	return 0;
	141	obj->flags \|= SEEN;
	142
f2fd0760	143	if (has_object_file(&obj->oid)) {
f88fcf8b	144	/* We already have it, so we should scan it now. */
85d106c2	145	obj->flags \|= TO_SCAN;
e5f38ec3 JH	146	}
e5f38ec3 JH	147	else {
7b64d06b SV	148	if (obj->flags & COMPLETE)
7b64d06b SV	149	return 0;
ed1c9977	150	walker->prefetch(walker, obj->oid.hash);
f88fcf8b	151	}
a6080a0a	152
1e8be59d DB	153	object_list_insert(obj, process_queue_end);
1e8be59d DB	154	process_queue_end = &(*process_queue_end)->next;
1e8be59d DB	155	return 0;
	156	}
	157
30ae764b	158	static int loop(struct walker *walker)
1e8be59d	159	{
85d106c2 JH	160	struct object_list *elem;
85d106c2 JH	161
1e8be59d DB	162	while (process_queue) {
1e8be59d DB	163	struct object *obj = process_queue->item;
85d106c2 JH	164	elem = process_queue;
	165	process_queue = elem->next;
	166	free(elem);
1e8be59d DB	167	if (!process_queue)
	168	process_queue_end = &process_queue;
	169
85d106c2 JH	170	/* If we are not scanning this object, we placed it in
	171	* the queue because we needed to fetch it first.
	172	*/
	173	if (! (obj->flags & TO_SCAN)) {
ed1c9977	174	if (walker->fetch(walker, obj->oid.hash)) {
0d7a6e4e	175	report_missing(obj);
85d106c2 JH	176	return -1;
	177	}
	178	}
1e8be59d	179	if (!obj->type)
c251c83d	180	parse_object(&obj->oid);
30ae764b	181	if (process_object(walker, obj))
f88fcf8b	182	return -1;
1e8be59d DB	183	}
1e8be59d DB	184	return 0;
3173bd49 DB	185	}
3173bd49 DB	186
94f5a121	187	static int interpret_target(struct walker walker, char target, struct object_id *oid)
cd541a68	188	{
94f5a121	189	if (!get_oid_hex(target, oid))
cd541a68	190	return 0;
8d9c5010	191	if (!check_refname_format(target, 0)) {
59c69c0c	192	struct ref *ref = alloc_ref(target);
c13b2633	193	if (!walker->fetch_ref(walker, ref)) {
94f5a121	194	oidcpy(oid, &ref->old_oid);
c13b2633	195	free(ref);
cd541a68 DB	196	return 0;
cd541a68 DB	197	}
c13b2633	198	free(ref);
cd541a68 DB	199	}
	200	return -1;
	201	}
	202
b4ebaf9e MH	203	static int mark_complete(const char path, const struct object_id oid,
b4ebaf9e MH	204	int flag, void *cb_data)
22c6e1d0	205	{
bc83266a	206	struct commit *commit = lookup_commit_reference_gently(oid, 1);
b4ebaf9e	207
d0ac30f2 JH	208	if (commit) {
d0ac30f2 JH	209	commit->object.flags \|= COMPLETE;
3bc7a05b	210	commit_list_insert(commit, &complete);
22c6e1d0 DB	211	}
	212	return 0;
	213	}
cd541a68	214
30ae764b	215	int walker_targets_stdin(char *target, const char *write_ref)
8e87ca66 PB	216	{
8e87ca66 PB	217	int targets = 0, targets_alloc = 0;
f285a2d7	218	struct strbuf buf = STRBUF_INIT;
8e87ca66	219	target = NULL; write_ref = NULL;
8e87ca66 PB	220	while (1) {
	221	char *rf_one = NULL;
	222	char *tg_one;
	223
8f309aeb	224	if (strbuf_getline_lf(&buf, stdin) == EOF)
8e87ca66 PB	225	break;
	226	tg_one = buf.buf;
	227	rf_one = strchr(tg_one, '\t');
	228	if (rf_one)
	229	*rf_one++ = 0;
	230
	231	if (targets >= targets_alloc) {
	232	targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
2756ca43 RS	233	REALLOC_ARRAY(*target, targets_alloc);
2756ca43 RS	234	REALLOC_ARRAY(*write_ref, targets_alloc);
8e87ca66	235	}
9befac47	236	(*target)[targets] = xstrdup(tg_one);
8c53f071	237	(*write_ref)[targets] = xstrdup_or_null(rf_one);
8e87ca66 PB	238	targets++;
8e87ca66 PB	239	}
e6c019d0	240	strbuf_release(&buf);
8e87ca66 PB	241	return targets;
	242	}
	243
30ae764b	244	void walker_targets_free(int targets, char target, const char write_ref)
8e87ca66 PB	245	{
	246	while (targets--) {
	247	free(target[targets]);
24deea52	248	if (write_ref)
8e87ca66 PB	249	free((char *) write_ref[targets]);
	250	}
	251	}
	252
30ae764b DB	253	int walker_fetch(struct walker walker, int targets, char *target,
30ae764b DB	254	const char *write_ref, const char write_ref_log_details)
4250a5e5	255	{
b6b10bb4 RS	256	struct strbuf refname = STRBUF_INIT;
	257	struct strbuf err = STRBUF_INIT;
	258	struct ref_transaction *transaction = NULL;
94f5a121	259	struct object_id oids = xmalloc(targets sizeof(struct object_id));
b6b10bb4 RS	260	char *msg = NULL;
b6b10bb4 RS	261	int i, ret = -1;
cd541a68	262
98533b90	263	save_commit_buffer = 0;
4211e4d1	264
b6b10bb4 RS	265	if (write_ref) {
	266	transaction = ref_transaction_begin(&err);
	267	if (!transaction) {
	268	error("%s", err.buf);
	269	goto done;
d0740d92	270	}
cd541a68 DB	271	}
cd541a68 DB	272
3bc7a05b	273	if (!walker->get_recover) {
b4ebaf9e	274	for_each_ref(mark_complete, NULL);
3bc7a05b RS	275	commit_list_sort_by_date(&complete);
3bc7a05b RS	276	}
22c6e1d0	277
4211e4d1	278	for (i = 0; i < targets; i++) {
94f5a121	279	if (interpret_target(walker, target[i], oids + i)) {
5f48741a	280	error("Could not interpret response from server '%s' as something to pull", target[i]);
b6b10bb4	281	goto done;
4211e4d1	282	}
94f5a121	283	if (process(walker, lookup_unknown_object(oids[i].hash)))
b6b10bb4	284	goto done;
4bd18c43	285	}
4211e4d1	286
30ae764b	287	if (loop(walker))
b6b10bb4 RS	288	goto done;
	289	if (!write_ref) {
	290	ret = 0;
	291	goto done;
	292	}
4211e4d1	293	if (write_ref_log_details) {
01d678a2	294	msg = xstrfmt("fetch from %s", write_ref_log_details);
4211e4d1 PB	295	} else {
4211e4d1 PB	296	msg = NULL;
4bd18c43	297	}
4211e4d1	298	for (i = 0; i < targets; i++) {
b6b10bb4	299	if (!write_ref[i])
4211e4d1	300	continue;
b6b10bb4 RS	301	strbuf_reset(&refname);
	302	strbuf_addf(&refname, "refs/%s", write_ref[i]);
	303	if (ref_transaction_update(transaction, refname.buf,
89f3bbdd	304	oids + i, NULL, 0,
db7516ab	305	msg ? msg : "fetch (unknown)",
b6b10bb4 RS	306	&err)) {
	307	error("%s", err.buf);
	308	goto done;
	309	}
	310	}
db7516ab	311	if (ref_transaction_commit(transaction, &err)) {
b6b10bb4 RS	312	error("%s", err.buf);
b6b10bb4 RS	313	goto done;
4bd18c43	314	}
4211e4d1	315
b6b10bb4	316	ret = 0;
30ae764b	317
b6b10bb4 RS	318	done:
	319	ref_transaction_free(transaction);
	320	free(msg);
94f5a121	321	free(oids);
b6b10bb4 RS	322	strbuf_release(&err);
	323	strbuf_release(&refname);
	324	return ret;
4250a5e5	325	}
30ae764b DB	326
	327	void walker_free(struct walker *walker)
	328	{
	329	walker->cleanup(walker);
	330	free(walker);
	331	}