[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 unsigned char current_commit_sha1[20];

void walker_say(struct walker *walker, const char *fmt, const char *hex)
{
	if (walker->get_verbosely)
		fprintf(stderr, fmt, hex);
}

static void report_missing(const struct object *obj)
{
	fprintf(stderr, "Cannot obtain needed %s %s\n",
		obj->type ? typename(obj->type): "object",
		oid_to_hex(&obj->oid));
	if (!is_null_sha1(current_commit_sha1))
		fprintf(stderr, "while processing commit %s.\n",
			sha1_to_hex(current_commit_sha1));
}

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.sha1);
			if (tree)
				obj = &tree->object;
		}
		else {
			struct blob *blob = lookup_blob(entry.sha1);
			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)
{
	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;

	hashcpy(current_commit_sha1, get_object_hash(commit->object));

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

	if (walker->get_tree) {
		if (process(walker, &commit->tree->object))
			return -1;
		if (!walker->get_all)
			walker->get_tree = 0;
	}
	if (walker->get_history) {
		struct commit_list *parents = commit->parents;
		for (; 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",
		     typename(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, get_object_hash(*obj));
	}

	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, get_object_hash(*obj))) {
				report_missing(obj);
				return -1;
			}
		}
		if (!obj->type)
			parse_object(get_object_hash(*obj));
		if (process_object(walker, obj))
			return -1;
	}
	return 0;
}

static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
{
	if (!get_sha1_hex(target, sha1))
		return 0;
	if (!check_refname_format(target, 0)) {
		struct ref *ref = alloc_ref(target);
		if (!walker->fetch_ref(walker, ref)) {
			hashcpy(sha1, ref->old_oid.hash);
			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->hash, 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(&buf, stdin, '\n') == 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;
	unsigned char *sha1 = xmalloc(targets * 20);
	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], &sha1[20 * i])) {
			error("Could not interpret response from server '%s' as something to pull", target[i]);
			goto done;
		}
		if (process(walker, lookup_unknown_object(&sha1[20 * 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,
					   &sha1[20 * 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(sha1);
	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
b2d62f16	10	static unsigned char current_commit_sha1[20];
4250a5e5	11
30ae764b	12	void walker_say(struct walker walker, const char fmt, const char *hex)
1e8be59d	13	{
30ae764b	14	if (walker->get_verbosely)
e78d9772 JH	15	fprintf(stderr, fmt, hex);
	16	}
	17
0d7a6e4e	18	static void report_missing(const struct object *obj)
b2d62f16	19	{
0d7a6e4e	20	fprintf(stderr, "Cannot obtain needed %s %s\n",
2b87d3a8	21	obj->type ? typename(obj->type): "object",
f2fd0760	22	oid_to_hex(&obj->oid));
0d7a6e4e AR	23	if (!is_null_sha1(current_commit_sha1))
	24	fprintf(stderr, "while processing commit %s.\n",
	25	sha1_to_hex(current_commit_sha1));
b2d62f16 JH	26	}
b2d62f16 JH	27
30ae764b	28	static int process(struct walker walker, struct object obj);
3173bd49	29
30ae764b	30	static int process_tree(struct walker walker, struct tree tree)
4250a5e5	31	{
1bc995a3	32	struct tree_desc desc;
4c068a98	33	struct name_entry entry;
4250a5e5 DB	34
	35	if (parse_tree(tree))
	36	return -1;
	37
6fda5e51	38	init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98	39	while (tree_entry(&desc, &entry)) {
6f9012b6 JH	40	struct object *obj = NULL;
6f9012b6 JH	41
582c7393	42	/* submodule commits are not stored in the superproject */
68fb4650	43	if (S_ISGITLINK(entry.mode))
582c7393	44	continue;
4c068a98 LT	45	if (S_ISDIR(entry.mode)) {
4c068a98 LT	46	struct tree *tree = lookup_tree(entry.sha1);
6f9012b6 JH	47	if (tree)
	48	obj = &tree->object;
	49	}
	50	else {
4c068a98	51	struct blob *blob = lookup_blob(entry.sha1);
6f9012b6 JH	52	if (blob)
6f9012b6 JH	53	obj = &blob->object;
2d9c58c6	54	}
30ae764b	55	if (!obj \|\| process(walker, obj))
4250a5e5	56	return -1;
4250a5e5	57	}
6e454b9a	58	free_tree_buffer(tree);
4250a5e5 DB	59	return 0;
	60	}
	61
208acbfb	62	/* Remember to update object flag allocation in object.h */
24451c31 SV	63	#define COMPLETE (1U << 0)
	64	#define SEEN (1U << 1)
	65	#define TO_SCAN (1U << 2)
85d106c2	66
d0ac30f2	67	static struct commit_list *complete = NULL;
22c6e1d0	68
30ae764b	69	static int process_commit(struct walker walker, struct commit commit)
4250a5e5	70	{
1e8be59d	71	if (parse_commit(commit))
4250a5e5 DB	72	return -1;
4250a5e5 DB	73
22c6e1d0	74	while (complete && complete->item->date >= commit->date) {
d0ac30f2	75	pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0	76	}
22c6e1d0	77
d0ac30f2	78	if (commit->object.flags & COMPLETE)
22c6e1d0 DB	79	return 0;
22c6e1d0 DB	80
7999b2cf	81	hashcpy(current_commit_sha1, get_object_hash(commit->object));
4250a5e5	82
f2fd0760	83	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
85d106c2	84
30ae764b DB	85	if (walker->get_tree) {
30ae764b DB	86	if (process(walker, &commit->tree->object))
4250a5e5	87	return -1;
30ae764b DB	88	if (!walker->get_all)
30ae764b DB	89	walker->get_tree = 0;
4250a5e5	90	}
30ae764b	91	if (walker->get_history) {
1e8be59d	92	struct commit_list *parents = commit->parents;
4250a5e5	93	for (; parents; parents = parents->next) {
30ae764b	94	if (process(walker, &parents->item->object))
4250a5e5 DB	95	return -1;
	96	}
	97	}
	98	return 0;
	99	}
	100
30ae764b	101	static int process_tag(struct walker walker, struct tag tag)
3173bd49	102	{
1e8be59d	103	if (parse_tag(tag))
3173bd49	104	return -1;
30ae764b	105	return process(walker, tag->tagged);
3173bd49 DB	106	}
3173bd49 DB	107
1e8be59d DB	108	static struct object_list *process_queue = NULL;
	109	static struct object_list **process_queue_end = &process_queue;
	110
30ae764b	111	static int process_object(struct walker walker, struct object obj)
3173bd49	112	{
1974632c	113	if (obj->type == OBJ_COMMIT) {
30ae764b	114	if (process_commit(walker, (struct commit *)obj))
f88fcf8b DB	115	return -1;
	116	return 0;
	117	}
1974632c	118	if (obj->type == OBJ_TREE) {
30ae764b	119	if (process_tree(walker, (struct tree *)obj))
f88fcf8b DB	120	return -1;
	121	return 0;
	122	}
1974632c	123	if (obj->type == OBJ_BLOB) {
f88fcf8b DB	124	return 0;
f88fcf8b DB	125	}
1974632c	126	if (obj->type == OBJ_TAG) {
30ae764b	127	if (process_tag(walker, (struct tag *)obj))
f88fcf8b	128	return -1;
3173bd49	129	return 0;
f88fcf8b DB	130	}
	131	return error("Unable to determine requirements "
	132	"of type %s for %s",
f2fd0760	133	typename(obj->type), oid_to_hex(&obj->oid));
f88fcf8b DB	134	}
f88fcf8b DB	135
30ae764b	136	static int process(struct walker walker, struct object obj)
f88fcf8b	137	{
a82d07e5 SV	138	if (obj->flags & SEEN)
	139	return 0;
	140	obj->flags \|= SEEN;
	141
f2fd0760	142	if (has_object_file(&obj->oid)) {
f88fcf8b	143	/* We already have it, so we should scan it now. */
85d106c2	144	obj->flags \|= TO_SCAN;
e5f38ec3 JH	145	}
e5f38ec3 JH	146	else {
7b64d06b SV	147	if (obj->flags & COMPLETE)
7b64d06b SV	148	return 0;
7999b2cf	149	walker->prefetch(walker, get_object_hash(*obj));
f88fcf8b	150	}
a6080a0a	151
1e8be59d DB	152	object_list_insert(obj, process_queue_end);
1e8be59d DB	153	process_queue_end = &(*process_queue_end)->next;
1e8be59d DB	154	return 0;
	155	}
	156
30ae764b	157	static int loop(struct walker *walker)
1e8be59d	158	{
85d106c2 JH	159	struct object_list *elem;
85d106c2 JH	160
1e8be59d DB	161	while (process_queue) {
1e8be59d DB	162	struct object *obj = process_queue->item;
85d106c2 JH	163	elem = process_queue;
	164	process_queue = elem->next;
	165	free(elem);
1e8be59d DB	166	if (!process_queue)
	167	process_queue_end = &process_queue;
	168
85d106c2 JH	169	/* If we are not scanning this object, we placed it in
	170	* the queue because we needed to fetch it first.
	171	*/
	172	if (! (obj->flags & TO_SCAN)) {
7999b2cf	173	if (walker->fetch(walker, get_object_hash(*obj))) {
0d7a6e4e	174	report_missing(obj);
85d106c2 JH	175	return -1;
	176	}
	177	}
1e8be59d	178	if (!obj->type)
7999b2cf	179	parse_object(get_object_hash(*obj));
30ae764b	180	if (process_object(walker, obj))
f88fcf8b	181	return -1;
1e8be59d DB	182	}
1e8be59d DB	183	return 0;
3173bd49 DB	184	}
3173bd49 DB	185
30ae764b	186	static int interpret_target(struct walker walker, char target, unsigned char *sha1)
cd541a68 DB	187	{
	188	if (!get_sha1_hex(target, sha1))
	189	return 0;
8d9c5010	190	if (!check_refname_format(target, 0)) {
59c69c0c	191	struct ref *ref = alloc_ref(target);
c13b2633	192	if (!walker->fetch_ref(walker, ref)) {
f4e54d02	193	hashcpy(sha1, ref->old_oid.hash);
c13b2633	194	free(ref);
cd541a68 DB	195	return 0;
cd541a68 DB	196	}
c13b2633	197	free(ref);
cd541a68 DB	198	}
	199	return -1;
	200	}
	201
b4ebaf9e MH	202	static int mark_complete(const char path, const struct object_id oid,
b4ebaf9e MH	203	int flag, void *cb_data)
22c6e1d0	204	{
b4ebaf9e MH	205	struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
b4ebaf9e MH	206
d0ac30f2 JH	207	if (commit) {
d0ac30f2 JH	208	commit->object.flags \|= COMPLETE;
3bc7a05b	209	commit_list_insert(commit, &complete);
22c6e1d0 DB	210	}
	211	return 0;
	212	}
cd541a68	213
30ae764b	214	int walker_targets_stdin(char *target, const char *write_ref)
8e87ca66 PB	215	{
8e87ca66 PB	216	int targets = 0, targets_alloc = 0;
f285a2d7	217	struct strbuf buf = STRBUF_INIT;
8e87ca66	218	target = NULL; write_ref = NULL;
8e87ca66 PB	219	while (1) {
	220	char *rf_one = NULL;
	221	char *tg_one;
	222
e6c019d0	223	if (strbuf_getline(&buf, stdin, '\n') == EOF)
8e87ca66 PB	224	break;
	225	tg_one = buf.buf;
	226	rf_one = strchr(tg_one, '\t');
	227	if (rf_one)
	228	*rf_one++ = 0;
	229
	230	if (targets >= targets_alloc) {
	231	targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
2756ca43 RS	232	REALLOC_ARRAY(*target, targets_alloc);
2756ca43 RS	233	REALLOC_ARRAY(*write_ref, targets_alloc);
8e87ca66	234	}
9befac47	235	(*target)[targets] = xstrdup(tg_one);
8c53f071	236	(*write_ref)[targets] = xstrdup_or_null(rf_one);
8e87ca66 PB	237	targets++;
8e87ca66 PB	238	}
e6c019d0	239	strbuf_release(&buf);
8e87ca66 PB	240	return targets;
	241	}
	242
30ae764b	243	void walker_targets_free(int targets, char target, const char write_ref)
8e87ca66 PB	244	{
	245	while (targets--) {
	246	free(target[targets]);
24deea52	247	if (write_ref)
8e87ca66 PB	248	free((char *) write_ref[targets]);
	249	}
	250	}
	251
30ae764b DB	252	int walker_fetch(struct walker walker, int targets, char *target,
30ae764b DB	253	const char *write_ref, const char write_ref_log_details)
4250a5e5	254	{
b6b10bb4 RS	255	struct strbuf refname = STRBUF_INIT;
	256	struct strbuf err = STRBUF_INIT;
	257	struct ref_transaction *transaction = NULL;
4211e4d1	258	unsigned char sha1 = xmalloc(targets 20);
b6b10bb4 RS	259	char *msg = NULL;
b6b10bb4 RS	260	int i, ret = -1;
cd541a68	261
98533b90	262	save_commit_buffer = 0;
4211e4d1	263
b6b10bb4 RS	264	if (write_ref) {
	265	transaction = ref_transaction_begin(&err);
	266	if (!transaction) {
	267	error("%s", err.buf);
	268	goto done;
d0740d92	269	}
cd541a68 DB	270	}
cd541a68 DB	271
3bc7a05b	272	if (!walker->get_recover) {
b4ebaf9e	273	for_each_ref(mark_complete, NULL);
3bc7a05b RS	274	commit_list_sort_by_date(&complete);
3bc7a05b RS	275	}
22c6e1d0	276
4211e4d1	277	for (i = 0; i < targets; i++) {
30ae764b	278	if (interpret_target(walker, target[i], &sha1[20 * i])) {
5f48741a	279	error("Could not interpret response from server '%s' as something to pull", target[i]);
b6b10bb4	280	goto done;
4211e4d1	281	}
30ae764b	282	if (process(walker, lookup_unknown_object(&sha1[20 * i])))
b6b10bb4	283	goto done;
4bd18c43	284	}
4211e4d1	285
30ae764b	286	if (loop(walker))
b6b10bb4 RS	287	goto done;
	288	if (!write_ref) {
	289	ret = 0;
	290	goto done;
	291	}
4211e4d1	292	if (write_ref_log_details) {
01d678a2	293	msg = xstrfmt("fetch from %s", write_ref_log_details);
4211e4d1 PB	294	} else {
4211e4d1 PB	295	msg = NULL;
4bd18c43	296	}
4211e4d1	297	for (i = 0; i < targets; i++) {
b6b10bb4	298	if (!write_ref[i])
4211e4d1	299	continue;
b6b10bb4 RS	300	strbuf_reset(&refname);
	301	strbuf_addf(&refname, "refs/%s", write_ref[i]);
	302	if (ref_transaction_update(transaction, refname.buf,
1d147bdf	303	&sha1[20 * i], NULL, 0,
db7516ab	304	msg ? msg : "fetch (unknown)",
b6b10bb4 RS	305	&err)) {
	306	error("%s", err.buf);
	307	goto done;
	308	}
	309	}
db7516ab	310	if (ref_transaction_commit(transaction, &err)) {
b6b10bb4 RS	311	error("%s", err.buf);
b6b10bb4 RS	312	goto done;
4bd18c43	313	}
4211e4d1	314
b6b10bb4	315	ret = 0;
30ae764b	316
b6b10bb4 RS	317	done:
	318	ref_transaction_free(transaction);
	319	free(msg);
	320	free(sha1);
	321	strbuf_release(&err);
	322	strbuf_release(&refname);
	323	return ret;
4250a5e5	324	}
30ae764b DB	325
	326	void walker_free(struct walker *walker)
	327	{
	328	walker->cleanup(walker);
	329	free(walker);
	330	}