object.h: centralize object flag allocation
[git/git.git] / walker.c
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"
9
10 static unsigned char current_commit_sha1[20];
11
12 void walker_say(struct walker *walker, const char *fmt, const char *hex)
13 {
14 if (walker->get_verbosely)
15 fprintf(stderr, fmt, hex);
16 }
17
18 static void report_missing(const struct object *obj)
19 {
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));
27 }
28
29 static int process(struct walker *walker, struct object *obj);
30
31 static int process_tree(struct walker *walker, struct tree *tree)
32 {
33 struct tree_desc desc;
34 struct name_entry entry;
35
36 if (parse_tree(tree))
37 return -1;
38
39 init_tree_desc(&desc, tree->buffer, tree->size);
40 while (tree_entry(&desc, &entry)) {
41 struct object *obj = NULL;
42
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;
50 }
51 else {
52 struct blob *blob = lookup_blob(entry.sha1);
53 if (blob)
54 obj = &blob->object;
55 }
56 if (!obj || process(walker, obj))
57 return -1;
58 }
59 free_tree_buffer(tree);
60 return 0;
61 }
62
63 /* Remember to update object flag allocation in object.h */
64 #define COMPLETE (1U << 0)
65 #define SEEN (1U << 1)
66 #define TO_SCAN (1U << 2)
67
68 static struct commit_list *complete = NULL;
69
70 static int process_commit(struct walker *walker, struct commit *commit)
71 {
72 if (parse_commit(commit))
73 return -1;
74
75 while (complete && complete->item->date >= commit->date) {
76 pop_most_recent_commit(&complete, COMPLETE);
77 }
78
79 if (commit->object.flags & COMPLETE)
80 return 0;
81
82 hashcpy(current_commit_sha1, commit->object.sha1);
83
84 walker_say(walker, "walk %s\n", sha1_to_hex(commit->object.sha1));
85
86 if (walker->get_tree) {
87 if (process(walker, &commit->tree->object))
88 return -1;
89 if (!walker->get_all)
90 walker->get_tree = 0;
91 }
92 if (walker->get_history) {
93 struct commit_list *parents = commit->parents;
94 for (; parents; parents = parents->next) {
95 if (process(walker, &parents->item->object))
96 return -1;
97 }
98 }
99 return 0;
100 }
101
102 static int process_tag(struct walker *walker, struct tag *tag)
103 {
104 if (parse_tag(tag))
105 return -1;
106 return process(walker, tag->tagged);
107 }
108
109 static struct object_list *process_queue = NULL;
110 static struct object_list **process_queue_end = &process_queue;
111
112 static int process_object(struct walker *walker, struct object *obj)
113 {
114 if (obj->type == OBJ_COMMIT) {
115 if (process_commit(walker, (struct commit *)obj))
116 return -1;
117 return 0;
118 }
119 if (obj->type == OBJ_TREE) {
120 if (process_tree(walker, (struct tree *)obj))
121 return -1;
122 return 0;
123 }
124 if (obj->type == OBJ_BLOB) {
125 return 0;
126 }
127 if (obj->type == OBJ_TAG) {
128 if (process_tag(walker, (struct tag *)obj))
129 return -1;
130 return 0;
131 }
132 return error("Unable to determine requirements "
133 "of type %s for %s",
134 typename(obj->type), sha1_to_hex(obj->sha1));
135 }
136
137 static int process(struct walker *walker, struct object *obj)
138 {
139 if (obj->flags & SEEN)
140 return 0;
141 obj->flags |= SEEN;
142
143 if (has_sha1_file(obj->sha1)) {
144 /* We already have it, so we should scan it now. */
145 obj->flags |= TO_SCAN;
146 }
147 else {
148 if (obj->flags & COMPLETE)
149 return 0;
150 walker->prefetch(walker, obj->sha1);
151 }
152
153 object_list_insert(obj, process_queue_end);
154 process_queue_end = &(*process_queue_end)->next;
155 return 0;
156 }
157
158 static int loop(struct walker *walker)
159 {
160 struct object_list *elem;
161
162 while (process_queue) {
163 struct object *obj = process_queue->item;
164 elem = process_queue;
165 process_queue = elem->next;
166 free(elem);
167 if (!process_queue)
168 process_queue_end = &process_queue;
169
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)) {
174 if (walker->fetch(walker, obj->sha1)) {
175 report_missing(obj);
176 return -1;
177 }
178 }
179 if (!obj->type)
180 parse_object(obj->sha1);
181 if (process_object(walker, obj))
182 return -1;
183 }
184 return 0;
185 }
186
187 static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
188 {
189 if (!get_sha1_hex(target, sha1))
190 return 0;
191 if (!check_refname_format(target, 0)) {
192 struct ref *ref = alloc_ref(target);
193 if (!walker->fetch_ref(walker, ref)) {
194 hashcpy(sha1, ref->old_sha1);
195 free(ref);
196 return 0;
197 }
198 free(ref);
199 }
200 return -1;
201 }
202
203 static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
204 {
205 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
206 if (commit) {
207 commit->object.flags |= COMPLETE;
208 commit_list_insert_by_date(commit, &complete);
209 }
210 return 0;
211 }
212
213 int walker_targets_stdin(char ***target, const char ***write_ref)
214 {
215 int targets = 0, targets_alloc = 0;
216 struct strbuf buf = STRBUF_INIT;
217 *target = NULL; *write_ref = NULL;
218 while (1) {
219 char *rf_one = NULL;
220 char *tg_one;
221
222 if (strbuf_getline(&buf, stdin, '\n') == EOF)
223 break;
224 tg_one = buf.buf;
225 rf_one = strchr(tg_one, '\t');
226 if (rf_one)
227 *rf_one++ = 0;
228
229 if (targets >= targets_alloc) {
230 targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
231 *target = xrealloc(*target, targets_alloc * sizeof(**target));
232 *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
233 }
234 (*target)[targets] = xstrdup(tg_one);
235 (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
236 targets++;
237 }
238 strbuf_release(&buf);
239 return targets;
240 }
241
242 void walker_targets_free(int targets, char **target, const char **write_ref)
243 {
244 while (targets--) {
245 free(target[targets]);
246 if (write_ref)
247 free((char *) write_ref[targets]);
248 }
249 }
250
251 int walker_fetch(struct walker *walker, int targets, char **target,
252 const char **write_ref, const char *write_ref_log_details)
253 {
254 struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
255 unsigned char *sha1 = xmalloc(targets * 20);
256 char *msg;
257 int ret;
258 int i;
259
260 save_commit_buffer = 0;
261
262 for (i = 0; i < targets; i++) {
263 if (!write_ref || !write_ref[i])
264 continue;
265
266 lock[i] = lock_ref_sha1(write_ref[i], NULL);
267 if (!lock[i]) {
268 error("Can't lock ref %s", write_ref[i]);
269 goto unlock_and_fail;
270 }
271 }
272
273 if (!walker->get_recover)
274 for_each_ref(mark_complete, NULL);
275
276 for (i = 0; i < targets; i++) {
277 if (interpret_target(walker, target[i], &sha1[20 * i])) {
278 error("Could not interpret response from server '%s' as something to pull", target[i]);
279 goto unlock_and_fail;
280 }
281 if (process(walker, lookup_unknown_object(&sha1[20 * i])))
282 goto unlock_and_fail;
283 }
284
285 if (loop(walker))
286 goto unlock_and_fail;
287
288 if (write_ref_log_details) {
289 msg = xmalloc(strlen(write_ref_log_details) + 12);
290 sprintf(msg, "fetch from %s", write_ref_log_details);
291 } else {
292 msg = NULL;
293 }
294 for (i = 0; i < targets; i++) {
295 if (!write_ref || !write_ref[i])
296 continue;
297 ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
298 lock[i] = NULL;
299 if (ret)
300 goto unlock_and_fail;
301 }
302 free(msg);
303
304 return 0;
305
306 unlock_and_fail:
307 for (i = 0; i < targets; i++)
308 if (lock[i])
309 unlock_ref(lock[i]);
310
311 return -1;
312 }
313
314 void walker_free(struct walker *walker)
315 {
316 walker->cleanup(walker);
317 free(walker);
318 }