[thirdparty/git.git] / walker.c

#include "cache.h"
#include "walker.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(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, &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(&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"
cbd53a21	3	#include "object-store.h"
4250a5e5 DB	4	#include "commit.h"
4250a5e5 DB	5	#include "tree.h"
1bc995a3	6	#include "tree-walk.h"
3173bd49 DB	7	#include "tag.h"
3173bd49 DB	8	#include "blob.h"
cd541a68 DB	9	#include "refs.h"
cd541a68 DB	10
94f5a121	11	static struct object_id current_commit_oid;
4250a5e5	12
fa262cac	13	void walker_say(struct walker walker, const char fmt, ...)
1e8be59d	14	{
fa262cac JK	15	if (walker->get_verbosely) {
	16	va_list ap;
	17	va_start(ap, fmt);
	18	vfprintf(stderr, fmt, ap);
	19	va_end(ap);
	20	}
e78d9772 JH	21	}
e78d9772 JH	22
0d7a6e4e	23	static void report_missing(const struct object *obj)
b2d62f16	24	{
0d7a6e4e	25	fprintf(stderr, "Cannot obtain needed %s %s\n",
debca9d2	26	obj->type ? type_name(obj->type): "object",
f2fd0760	27	oid_to_hex(&obj->oid));
94f5a121	28	if (!is_null_oid(&current_commit_oid))
0d7a6e4e	29	fprintf(stderr, "while processing commit %s.\n",
94f5a121	30	oid_to_hex(&current_commit_oid));
b2d62f16 JH	31	}
b2d62f16 JH	32
30ae764b	33	static int process(struct walker walker, struct object obj);
3173bd49	34
30ae764b	35	static int process_tree(struct walker walker, struct tree tree)
4250a5e5	36	{
1bc995a3	37	struct tree_desc desc;
4c068a98	38	struct name_entry entry;
4250a5e5 DB	39
	40	if (parse_tree(tree))
	41	return -1;
	42
6fda5e51	43	init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98	44	while (tree_entry(&desc, &entry)) {
6f9012b6 JH	45	struct object *obj = NULL;
6f9012b6 JH	46
582c7393	47	/* submodule commits are not stored in the superproject */
68fb4650	48	if (S_ISGITLINK(entry.mode))
582c7393	49	continue;
4c068a98	50	if (S_ISDIR(entry.mode)) {
740ee055	51	struct tree *tree = lookup_tree(entry.oid);
6f9012b6 JH	52	if (tree)
	53	obj = &tree->object;
	54	}
	55	else {
3aca1fc6	56	struct blob *blob = lookup_blob(entry.oid);
6f9012b6 JH	57	if (blob)
6f9012b6 JH	58	obj = &blob->object;
2d9c58c6	59	}
30ae764b	60	if (!obj \|\| process(walker, obj))
4250a5e5	61	return -1;
4250a5e5	62	}
6e454b9a	63	free_tree_buffer(tree);
4250a5e5 DB	64	return 0;
	65	}
	66
208acbfb	67	/* Remember to update object flag allocation in object.h */
24451c31 SV	68	#define COMPLETE (1U << 0)
	69	#define SEEN (1U << 1)
	70	#define TO_SCAN (1U << 2)
85d106c2	71
d0ac30f2	72	static struct commit_list *complete = NULL;
22c6e1d0	73
30ae764b	74	static int process_commit(struct walker walker, struct commit commit)
4250a5e5	75	{
0b6b3429 MÅ	76	struct commit_list *parents;
0b6b3429 MÅ	77
1e8be59d	78	if (parse_commit(commit))
4250a5e5 DB	79	return -1;
4250a5e5 DB	80
22c6e1d0	81	while (complete && complete->item->date >= commit->date) {
d0ac30f2	82	pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0	83	}
22c6e1d0	84
d0ac30f2	85	if (commit->object.flags & COMPLETE)
22c6e1d0 DB	86	return 0;
22c6e1d0 DB	87
94f5a121	88	oidcpy(&current_commit_oid, &commit->object.oid);
4250a5e5	89
f2fd0760	90	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
85d106c2	91
c89b6e13	92	if (process(walker, &get_commit_tree(commit)->object))
0b6b3429 MÅ	93	return -1;
	94
	95	for (parents = commit->parents; parents; parents = parents->next) {
	96	if (process(walker, &parents->item->object))
4250a5e5	97	return -1;
4250a5e5	98	}
0b6b3429	99
4250a5e5 DB	100	return 0;
	101	}
	102
30ae764b	103	static int process_tag(struct walker walker, struct tag tag)
3173bd49	104	{
1e8be59d	105	if (parse_tag(tag))
3173bd49	106	return -1;
30ae764b	107	return process(walker, tag->tagged);
3173bd49 DB	108	}
3173bd49 DB	109
1e8be59d DB	110	static struct object_list *process_queue = NULL;
	111	static struct object_list **process_queue_end = &process_queue;
	112
30ae764b	113	static int process_object(struct walker walker, struct object obj)
3173bd49	114	{
1974632c	115	if (obj->type == OBJ_COMMIT) {
30ae764b	116	if (process_commit(walker, (struct commit *)obj))
f88fcf8b DB	117	return -1;
	118	return 0;
	119	}
1974632c	120	if (obj->type == OBJ_TREE) {
30ae764b	121	if (process_tree(walker, (struct tree *)obj))
f88fcf8b DB	122	return -1;
	123	return 0;
	124	}
1974632c	125	if (obj->type == OBJ_BLOB) {
f88fcf8b DB	126	return 0;
f88fcf8b DB	127	}
1974632c	128	if (obj->type == OBJ_TAG) {
30ae764b	129	if (process_tag(walker, (struct tag *)obj))
f88fcf8b	130	return -1;
3173bd49	131	return 0;
f88fcf8b DB	132	}
	133	return error("Unable to determine requirements "
	134	"of type %s for %s",
debca9d2	135	type_name(obj->type), oid_to_hex(&obj->oid));
f88fcf8b DB	136	}
f88fcf8b DB	137
30ae764b	138	static int process(struct walker walker, struct object obj)
f88fcf8b	139	{
a82d07e5 SV	140	if (obj->flags & SEEN)
	141	return 0;
	142	obj->flags \|= SEEN;
	143
f2fd0760	144	if (has_object_file(&obj->oid)) {
f88fcf8b	145	/* We already have it, so we should scan it now. */
85d106c2	146	obj->flags \|= TO_SCAN;
e5f38ec3 JH	147	}
e5f38ec3 JH	148	else {
7b64d06b SV	149	if (obj->flags & COMPLETE)
7b64d06b SV	150	return 0;
ed1c9977	151	walker->prefetch(walker, obj->oid.hash);
f88fcf8b	152	}
a6080a0a	153
1e8be59d DB	154	object_list_insert(obj, process_queue_end);
1e8be59d DB	155	process_queue_end = &(*process_queue_end)->next;
1e8be59d DB	156	return 0;
	157	}
	158
30ae764b	159	static int loop(struct walker *walker)
1e8be59d	160	{
85d106c2 JH	161	struct object_list *elem;
85d106c2 JH	162
1e8be59d DB	163	while (process_queue) {
1e8be59d DB	164	struct object *obj = process_queue->item;
85d106c2 JH	165	elem = process_queue;
	166	process_queue = elem->next;
	167	free(elem);
1e8be59d DB	168	if (!process_queue)
	169	process_queue_end = &process_queue;
	170
85d106c2 JH	171	/* If we are not scanning this object, we placed it in
	172	* the queue because we needed to fetch it first.
	173	*/
	174	if (! (obj->flags & TO_SCAN)) {
ed1c9977	175	if (walker->fetch(walker, obj->oid.hash)) {
0d7a6e4e	176	report_missing(obj);
85d106c2 JH	177	return -1;
	178	}
	179	}
1e8be59d	180	if (!obj->type)
c251c83d	181	parse_object(&obj->oid);
30ae764b	182	if (process_object(walker, obj))
f88fcf8b	183	return -1;
1e8be59d DB	184	}
1e8be59d DB	185	return 0;
3173bd49 DB	186	}
3173bd49 DB	187
94f5a121	188	static int interpret_target(struct walker walker, char target, struct object_id *oid)
cd541a68	189	{
94f5a121	190	if (!get_oid_hex(target, oid))
cd541a68	191	return 0;
8d9c5010	192	if (!check_refname_format(target, 0)) {
59c69c0c	193	struct ref *ref = alloc_ref(target);
c13b2633	194	if (!walker->fetch_ref(walker, ref)) {
94f5a121	195	oidcpy(oid, &ref->old_oid);
c13b2633	196	free(ref);
cd541a68 DB	197	return 0;
cd541a68 DB	198	}
c13b2633	199	free(ref);
cd541a68 DB	200	}
	201	return -1;
	202	}
	203
b4ebaf9e MH	204	static int mark_complete(const char path, const struct object_id oid,
b4ebaf9e MH	205	int flag, void *cb_data)
22c6e1d0	206	{
bc83266a	207	struct commit *commit = lookup_commit_reference_gently(oid, 1);
b4ebaf9e	208
d0ac30f2 JH	209	if (commit) {
d0ac30f2 JH	210	commit->object.flags \|= COMPLETE;
3bc7a05b	211	commit_list_insert(commit, &complete);
22c6e1d0 DB	212	}
	213	return 0;
	214	}
cd541a68	215
30ae764b	216	int walker_targets_stdin(char *target, const char *write_ref)
8e87ca66 PB	217	{
8e87ca66 PB	218	int targets = 0, targets_alloc = 0;
f285a2d7	219	struct strbuf buf = STRBUF_INIT;
8e87ca66	220	target = NULL; write_ref = NULL;
8e87ca66 PB	221	while (1) {
	222	char *rf_one = NULL;
	223	char *tg_one;
	224
8f309aeb	225	if (strbuf_getline_lf(&buf, stdin) == EOF)
8e87ca66 PB	226	break;
	227	tg_one = buf.buf;
	228	rf_one = strchr(tg_one, '\t');
	229	if (rf_one)
	230	*rf_one++ = 0;
	231
	232	if (targets >= targets_alloc) {
	233	targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
2756ca43 RS	234	REALLOC_ARRAY(*target, targets_alloc);
2756ca43 RS	235	REALLOC_ARRAY(*write_ref, targets_alloc);
8e87ca66	236	}
9befac47	237	(*target)[targets] = xstrdup(tg_one);
8c53f071	238	(*write_ref)[targets] = xstrdup_or_null(rf_one);
8e87ca66 PB	239	targets++;
8e87ca66 PB	240	}
e6c019d0	241	strbuf_release(&buf);
8e87ca66 PB	242	return targets;
	243	}
	244
30ae764b	245	void walker_targets_free(int targets, char target, const char write_ref)
8e87ca66 PB	246	{
	247	while (targets--) {
	248	free(target[targets]);
24deea52	249	if (write_ref)
8e87ca66 PB	250	free((char *) write_ref[targets]);
	251	}
	252	}
	253
30ae764b DB	254	int walker_fetch(struct walker walker, int targets, char *target,
30ae764b DB	255	const char *write_ref, const char write_ref_log_details)
4250a5e5	256	{
b6b10bb4 RS	257	struct strbuf refname = STRBUF_INIT;
	258	struct strbuf err = STRBUF_INIT;
	259	struct ref_transaction *transaction = NULL;
94f5a121	260	struct object_id oids = xmalloc(targets sizeof(struct object_id));
b6b10bb4 RS	261	char *msg = NULL;
b6b10bb4 RS	262	int i, ret = -1;
cd541a68	263
98533b90	264	save_commit_buffer = 0;
4211e4d1	265
b6b10bb4 RS	266	if (write_ref) {
	267	transaction = ref_transaction_begin(&err);
	268	if (!transaction) {
	269	error("%s", err.buf);
	270	goto done;
d0740d92	271	}
cd541a68 DB	272	}
cd541a68 DB	273
3bc7a05b	274	if (!walker->get_recover) {
b4ebaf9e	275	for_each_ref(mark_complete, NULL);
3bc7a05b RS	276	commit_list_sort_by_date(&complete);
3bc7a05b RS	277	}
22c6e1d0	278
4211e4d1	279	for (i = 0; i < targets; i++) {
94f5a121	280	if (interpret_target(walker, target[i], oids + i)) {
5f48741a	281	error("Could not interpret response from server '%s' as something to pull", target[i]);
b6b10bb4	282	goto done;
4211e4d1	283	}
94f5a121	284	if (process(walker, lookup_unknown_object(oids[i].hash)))
b6b10bb4	285	goto done;
4bd18c43	286	}
4211e4d1	287
30ae764b	288	if (loop(walker))
b6b10bb4 RS	289	goto done;
	290	if (!write_ref) {
	291	ret = 0;
	292	goto done;
	293	}
4211e4d1	294	if (write_ref_log_details) {
01d678a2	295	msg = xstrfmt("fetch from %s", write_ref_log_details);
4211e4d1 PB	296	} else {
4211e4d1 PB	297	msg = NULL;
4bd18c43	298	}
4211e4d1	299	for (i = 0; i < targets; i++) {
b6b10bb4	300	if (!write_ref[i])
4211e4d1	301	continue;
b6b10bb4 RS	302	strbuf_reset(&refname);
	303	strbuf_addf(&refname, "refs/%s", write_ref[i]);
	304	if (ref_transaction_update(transaction, refname.buf,
89f3bbdd	305	oids + i, NULL, 0,
db7516ab	306	msg ? msg : "fetch (unknown)",
b6b10bb4 RS	307	&err)) {
	308	error("%s", err.buf);
	309	goto done;
	310	}
	311	}
db7516ab	312	if (ref_transaction_commit(transaction, &err)) {
b6b10bb4 RS	313	error("%s", err.buf);
b6b10bb4 RS	314	goto done;
4bd18c43	315	}
4211e4d1	316
b6b10bb4	317	ret = 0;
30ae764b	318
b6b10bb4 RS	319	done:
	320	ref_transaction_free(transaction);
	321	free(msg);
94f5a121	322	free(oids);
b6b10bb4 RS	323	strbuf_release(&err);
	324	strbuf_release(&refname);
	325	return ret;
4250a5e5	326	}
30ae764b DB	327
	328	void walker_free(struct walker *walker)
	329	{
	330	walker->cleanup(walker);
	331	free(walker);
	332	}