Merge branch 'wk/man-deny-current-branch-is-default-these-days' into maint
[git/mingw.git] / walker.c
blobbe389dc9bf5161c31be29e3a72264fd6120a0bbc
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 tree->object.parsed = 0;
63 return 0;
66 #define COMPLETE (1U << 0)
67 #define SEEN (1U << 1)
68 #define TO_SCAN (1U << 2)
70 static struct commit_list *complete = NULL;
72 static int process_commit(struct walker *walker, struct commit *commit)
74 if (parse_commit(commit))
75 return -1;
77 while (complete && complete->item->date >= commit->date) {
78 pop_most_recent_commit(&complete, COMPLETE);
81 if (commit->object.flags & COMPLETE)
82 return 0;
84 hashcpy(current_commit_sha1, commit->object.sha1);
86 walker_say(walker, "walk %s\n", sha1_to_hex(commit->object.sha1));
88 if (walker->get_tree) {
89 if (process(walker, &commit->tree->object))
90 return -1;
91 if (!walker->get_all)
92 walker->get_tree = 0;
94 if (walker->get_history) {
95 struct commit_list *parents = commit->parents;
96 for (; parents; parents = parents->next) {
97 if (process(walker, &parents->item->object))
98 return -1;
101 return 0;
104 static int process_tag(struct walker *walker, struct tag *tag)
106 if (parse_tag(tag))
107 return -1;
108 return process(walker, tag->tagged);
111 static struct object_list *process_queue = NULL;
112 static struct object_list **process_queue_end = &process_queue;
114 static int process_object(struct walker *walker, struct object *obj)
116 if (obj->type == OBJ_COMMIT) {
117 if (process_commit(walker, (struct commit *)obj))
118 return -1;
119 return 0;
121 if (obj->type == OBJ_TREE) {
122 if (process_tree(walker, (struct tree *)obj))
123 return -1;
124 return 0;
126 if (obj->type == OBJ_BLOB) {
127 return 0;
129 if (obj->type == OBJ_TAG) {
130 if (process_tag(walker, (struct tag *)obj))
131 return -1;
132 return 0;
134 return error("Unable to determine requirements "
135 "of type %s for %s",
136 typename(obj->type), sha1_to_hex(obj->sha1));
139 static int process(struct walker *walker, struct object *obj)
141 if (obj->flags & SEEN)
142 return 0;
143 obj->flags |= SEEN;
145 if (has_sha1_file(obj->sha1)) {
146 /* We already have it, so we should scan it now. */
147 obj->flags |= TO_SCAN;
149 else {
150 if (obj->flags & COMPLETE)
151 return 0;
152 walker->prefetch(walker, obj->sha1);
155 object_list_insert(obj, process_queue_end);
156 process_queue_end = &(*process_queue_end)->next;
157 return 0;
160 static int loop(struct walker *walker)
162 struct object_list *elem;
164 while (process_queue) {
165 struct object *obj = process_queue->item;
166 elem = process_queue;
167 process_queue = elem->next;
168 free(elem);
169 if (!process_queue)
170 process_queue_end = &process_queue;
172 /* If we are not scanning this object, we placed it in
173 * the queue because we needed to fetch it first.
175 if (! (obj->flags & TO_SCAN)) {
176 if (walker->fetch(walker, obj->sha1)) {
177 report_missing(obj);
178 return -1;
181 if (!obj->type)
182 parse_object(obj->sha1);
183 if (process_object(walker, obj))
184 return -1;
186 return 0;
189 static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
191 if (!get_sha1_hex(target, sha1))
192 return 0;
193 if (!check_refname_format(target, 0)) {
194 struct ref *ref = alloc_ref(target);
195 if (!walker->fetch_ref(walker, ref)) {
196 hashcpy(sha1, ref->old_sha1);
197 free(ref);
198 return 0;
200 free(ref);
202 return -1;
205 static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
207 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
208 if (commit) {
209 commit->object.flags |= COMPLETE;
210 commit_list_insert_by_date(commit, &complete);
212 return 0;
215 int walker_targets_stdin(char ***target, const char ***write_ref)
217 int targets = 0, targets_alloc = 0;
218 struct strbuf buf = STRBUF_INIT;
219 *target = NULL; *write_ref = NULL;
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)
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);