Merge branch 'maint'
[git/gitweb.git] / walker.c
blob31de6c16bd021003bdd4fc1475bfe500f28773f4
1 #include "cache.h"
2 #include "walker.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "tree-walk.h"
6 #include "tag.h"
7 #include "blob.h"
8 #include "refs.h"
10 static unsigned char current_commit_sha1[20];
12 void walker_say(struct walker *walker, const char *fmt, const char *hex)
14 if (walker->get_verbosely)
15 fprintf(stderr, fmt, hex);
18 static void report_missing(const struct object *obj)
20 char missing_hex[41];
21 strcpy(missing_hex, sha1_to_hex(obj->sha1));;
22 fprintf(stderr, "Cannot obtain needed %s %s\n",
23 obj->type ? typename(obj->type): "object", missing_hex);
24 if (!is_null_sha1(current_commit_sha1))
25 fprintf(stderr, "while processing commit %s.\n",
26 sha1_to_hex(current_commit_sha1));
29 static int process(struct walker *walker, struct object *obj);
31 static int process_tree(struct walker *walker, struct tree *tree)
33 struct tree_desc desc;
34 struct name_entry entry;
36 if (parse_tree(tree))
37 return -1;
39 init_tree_desc(&desc, tree->buffer, tree->size);
40 while (tree_entry(&desc, &entry)) {
41 struct object *obj = NULL;
43 /* submodule commits are not stored in the superproject */
44 if (S_ISGITLINK(entry.mode))
45 continue;
46 if (S_ISDIR(entry.mode)) {
47 struct tree *tree = lookup_tree(entry.sha1);
48 if (tree)
49 obj = &tree->object;
51 else {
52 struct blob *blob = lookup_blob(entry.sha1);
53 if (blob)
54 obj = &blob->object;
56 if (!obj || process(walker, obj))
57 return -1;
59 free(tree->buffer);
60 tree->buffer = NULL;
61 tree->size = 0;
62 return 0;
65 #define COMPLETE (1U << 0)
66 #define SEEN (1U << 1)
67 #define TO_SCAN (1U << 2)
69 static struct commit_list *complete = NULL;
71 static int process_commit(struct walker *walker, struct commit *commit)
73 if (parse_commit(commit))
74 return -1;
76 while (complete && complete->item->date >= commit->date) {
77 pop_most_recent_commit(&complete, COMPLETE);
80 if (commit->object.flags & COMPLETE)
81 return 0;
83 hashcpy(current_commit_sha1, commit->object.sha1);
85 walker_say(walker, "walk %s\n", sha1_to_hex(commit->object.sha1));
87 if (walker->get_tree) {
88 if (process(walker, &commit->tree->object))
89 return -1;
90 if (!walker->get_all)
91 walker->get_tree = 0;
93 if (walker->get_history) {
94 struct commit_list *parents = commit->parents;
95 for (; parents; parents = parents->next) {
96 if (process(walker, &parents->item->object))
97 return -1;
100 return 0;
103 static int process_tag(struct walker *walker, struct tag *tag)
105 if (parse_tag(tag))
106 return -1;
107 return process(walker, tag->tagged);
110 static struct object_list *process_queue = NULL;
111 static struct object_list **process_queue_end = &process_queue;
113 static int process_object(struct walker *walker, struct object *obj)
115 if (obj->type == OBJ_COMMIT) {
116 if (process_commit(walker, (struct commit *)obj))
117 return -1;
118 return 0;
120 if (obj->type == OBJ_TREE) {
121 if (process_tree(walker, (struct tree *)obj))
122 return -1;
123 return 0;
125 if (obj->type == OBJ_BLOB) {
126 return 0;
128 if (obj->type == OBJ_TAG) {
129 if (process_tag(walker, (struct tag *)obj))
130 return -1;
131 return 0;
133 return error("Unable to determine requirements "
134 "of type %s for %s",
135 typename(obj->type), sha1_to_hex(obj->sha1));
138 static int process(struct walker *walker, struct object *obj)
140 if (obj->flags & SEEN)
141 return 0;
142 obj->flags |= SEEN;
144 if (has_sha1_file(obj->sha1)) {
145 /* We already have it, so we should scan it now. */
146 obj->flags |= TO_SCAN;
148 else {
149 if (obj->flags & COMPLETE)
150 return 0;
151 walker->prefetch(walker, obj->sha1);
154 object_list_insert(obj, process_queue_end);
155 process_queue_end = &(*process_queue_end)->next;
156 return 0;
159 static int loop(struct walker *walker)
161 struct object_list *elem;
163 while (process_queue) {
164 struct object *obj = process_queue->item;
165 elem = process_queue;
166 process_queue = elem->next;
167 free(elem);
168 if (!process_queue)
169 process_queue_end = &process_queue;
171 /* If we are not scanning this object, we placed it in
172 * the queue because we needed to fetch it first.
174 if (! (obj->flags & TO_SCAN)) {
175 if (walker->fetch(walker, obj->sha1)) {
176 report_missing(obj);
177 return -1;
180 if (!obj->type)
181 parse_object(obj->sha1);
182 if (process_object(walker, obj))
183 return -1;
185 return 0;
188 static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
190 if (!get_sha1_hex(target, sha1))
191 return 0;
192 if (!check_ref_format(target)) {
193 struct ref *ref = alloc_ref_from_str(target);
194 if (!walker->fetch_ref(walker, ref)) {
195 hashcpy(sha1, ref->old_sha1);
196 free(ref);
197 return 0;
199 free(ref);
201 return -1;
204 static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
206 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
207 if (commit) {
208 commit->object.flags |= COMPLETE;
209 insert_by_date(commit, &complete);
211 return 0;
214 int walker_targets_stdin(char ***target, const char ***write_ref)
216 int targets = 0, targets_alloc = 0;
217 struct strbuf buf;
218 *target = NULL; *write_ref = NULL;
219 strbuf_init(&buf, 0);
220 while (1) {
221 char *rf_one = NULL;
222 char *tg_one;
224 if (strbuf_getline(&buf, stdin, '\n') == EOF)
225 break;
226 tg_one = buf.buf;
227 rf_one = strchr(tg_one, '\t');
228 if (rf_one)
229 *rf_one++ = 0;
231 if (targets >= targets_alloc) {
232 targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
233 *target = xrealloc(*target, targets_alloc * sizeof(**target));
234 *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
236 (*target)[targets] = xstrdup(tg_one);
237 (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
238 targets++;
240 strbuf_release(&buf);
241 return targets;
244 void walker_targets_free(int targets, char **target, const char **write_ref)
246 while (targets--) {
247 free(target[targets]);
248 if (write_ref && write_ref[targets])
249 free((char *) write_ref[targets]);
253 int walker_fetch(struct walker *walker, int targets, char **target,
254 const char **write_ref, const char *write_ref_log_details)
256 struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
257 unsigned char *sha1 = xmalloc(targets * 20);
258 char *msg;
259 int ret;
260 int i;
262 save_commit_buffer = 0;
264 for (i = 0; i < targets; i++) {
265 if (!write_ref || !write_ref[i])
266 continue;
268 lock[i] = lock_ref_sha1(write_ref[i], NULL);
269 if (!lock[i]) {
270 error("Can't lock ref %s", write_ref[i]);
271 goto unlock_and_fail;
275 if (!walker->get_recover)
276 for_each_ref(mark_complete, NULL);
278 for (i = 0; i < targets; i++) {
279 if (interpret_target(walker, target[i], &sha1[20 * i])) {
280 error("Could not interpret response from server '%s' as something to pull", target[i]);
281 goto unlock_and_fail;
283 if (process(walker, lookup_unknown_object(&sha1[20 * i])))
284 goto unlock_and_fail;
287 if (loop(walker))
288 goto unlock_and_fail;
290 if (write_ref_log_details) {
291 msg = xmalloc(strlen(write_ref_log_details) + 12);
292 sprintf(msg, "fetch from %s", write_ref_log_details);
293 } else {
294 msg = NULL;
296 for (i = 0; i < targets; i++) {
297 if (!write_ref || !write_ref[i])
298 continue;
299 ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
300 lock[i] = NULL;
301 if (ret)
302 goto unlock_and_fail;
304 free(msg);
306 return 0;
308 unlock_and_fail:
309 for (i = 0; i < targets; i++)
310 if (lock[i])
311 unlock_ref(lock[i]);
313 return -1;
316 void walker_free(struct walker *walker)
318 walker->cleanup(walker);
319 free(walker);