Merge branch 'rs/commit-graph-use-list-count'
[git/git.git] / walker.c
1 #include "cache.h"
2 #include "walker.h"
3 #include "repository.h"
4 #include "object-store.h"
5 #include "commit.h"
6 #include "tree.h"
7 #include "tree-walk.h"
8 #include "tag.h"
9 #include "blob.h"
10 #include "refs.h"
11
12 static struct object_id current_commit_oid;
13
14 void walker_say(struct walker *walker, const char *fmt, ...)
15 {
16 if (walker->get_verbosely) {
17 va_list ap;
18 va_start(ap, fmt);
19 vfprintf(stderr, fmt, ap);
20 va_end(ap);
21 }
22 }
23
24 static void report_missing(const struct object *obj)
25 {
26 fprintf(stderr, "Cannot obtain needed %s %s\n",
27 obj->type ? type_name(obj->type): "object",
28 oid_to_hex(&obj->oid));
29 if (!is_null_oid(&current_commit_oid))
30 fprintf(stderr, "while processing commit %s.\n",
31 oid_to_hex(&current_commit_oid));
32 }
33
34 static int process(struct walker *walker, struct object *obj);
35
36 static int process_tree(struct walker *walker, struct tree *tree)
37 {
38 struct tree_desc desc;
39 struct name_entry entry;
40
41 if (parse_tree(tree))
42 return -1;
43
44 init_tree_desc(&desc, tree->buffer, tree->size);
45 while (tree_entry(&desc, &entry)) {
46 struct object *obj = NULL;
47
48 /* submodule commits are not stored in the superproject */
49 if (S_ISGITLINK(entry.mode))
50 continue;
51 if (S_ISDIR(entry.mode)) {
52 struct tree *tree = lookup_tree(the_repository,
53 &entry.oid);
54 if (tree)
55 obj = &tree->object;
56 }
57 else {
58 struct blob *blob = lookup_blob(the_repository,
59 &entry.oid);
60 if (blob)
61 obj = &blob->object;
62 }
63 if (!obj || process(walker, obj))
64 return -1;
65 }
66 free_tree_buffer(tree);
67 return 0;
68 }
69
70 /* Remember to update object flag allocation in object.h */
71 #define COMPLETE (1U << 0)
72 #define SEEN (1U << 1)
73 #define TO_SCAN (1U << 2)
74
75 static struct commit_list *complete = NULL;
76
77 static int process_commit(struct walker *walker, struct commit *commit)
78 {
79 struct commit_list *parents;
80
81 if (parse_commit(commit))
82 return -1;
83
84 while (complete && complete->item->date >= commit->date) {
85 pop_most_recent_commit(&complete, COMPLETE);
86 }
87
88 if (commit->object.flags & COMPLETE)
89 return 0;
90
91 oidcpy(&current_commit_oid, &commit->object.oid);
92
93 walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
94
95 if (process(walker, &get_commit_tree(commit)->object))
96 return -1;
97
98 for (parents = commit->parents; parents; parents = parents->next) {
99 if (process(walker, &parents->item->object))
100 return -1;
101 }
102
103 return 0;
104 }
105
106 static int process_tag(struct walker *walker, struct tag *tag)
107 {
108 if (parse_tag(tag))
109 return -1;
110 return process(walker, tag->tagged);
111 }
112
113 static struct object_list *process_queue = NULL;
114 static struct object_list **process_queue_end = &process_queue;
115
116 static int process_object(struct walker *walker, struct object *obj)
117 {
118 if (obj->type == OBJ_COMMIT) {
119 if (process_commit(walker, (struct commit *)obj))
120 return -1;
121 return 0;
122 }
123 if (obj->type == OBJ_TREE) {
124 if (process_tree(walker, (struct tree *)obj))
125 return -1;
126 return 0;
127 }
128 if (obj->type == OBJ_BLOB) {
129 return 0;
130 }
131 if (obj->type == OBJ_TAG) {
132 if (process_tag(walker, (struct tag *)obj))
133 return -1;
134 return 0;
135 }
136 return error("Unable to determine requirements "
137 "of type %s for %s",
138 type_name(obj->type), oid_to_hex(&obj->oid));
139 }
140
141 static int process(struct walker *walker, struct object *obj)
142 {
143 if (obj->flags & SEEN)
144 return 0;
145 obj->flags |= SEEN;
146
147 if (has_object_file(&obj->oid)) {
148 /* We already have it, so we should scan it now. */
149 obj->flags |= TO_SCAN;
150 }
151 else {
152 if (obj->flags & COMPLETE)
153 return 0;
154 walker->prefetch(walker, obj->oid.hash);
155 }
156
157 object_list_insert(obj, process_queue_end);
158 process_queue_end = &(*process_queue_end)->next;
159 return 0;
160 }
161
162 static int loop(struct walker *walker)
163 {
164 struct object_list *elem;
165
166 while (process_queue) {
167 struct object *obj = process_queue->item;
168 elem = process_queue;
169 process_queue = elem->next;
170 free(elem);
171 if (!process_queue)
172 process_queue_end = &process_queue;
173
174 /* If we are not scanning this object, we placed it in
175 * the queue because we needed to fetch it first.
176 */
177 if (! (obj->flags & TO_SCAN)) {
178 if (walker->fetch(walker, obj->oid.hash)) {
179 report_missing(obj);
180 return -1;
181 }
182 }
183 if (!obj->type)
184 parse_object(the_repository, &obj->oid);
185 if (process_object(walker, obj))
186 return -1;
187 }
188 return 0;
189 }
190
191 static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
192 {
193 if (!get_oid_hex(target, oid))
194 return 0;
195 if (!check_refname_format(target, 0)) {
196 struct ref *ref = alloc_ref(target);
197 if (!walker->fetch_ref(walker, ref)) {
198 oidcpy(oid, &ref->old_oid);
199 free(ref);
200 return 0;
201 }
202 free(ref);
203 }
204 return -1;
205 }
206
207 static int mark_complete(const char *path, const struct object_id *oid,
208 int flag, void *cb_data)
209 {
210 struct commit *commit = lookup_commit_reference_gently(the_repository,
211 oid, 1);
212
213 if (commit) {
214 commit->object.flags |= COMPLETE;
215 commit_list_insert(commit, &complete);
216 }
217 return 0;
218 }
219
220 int walker_targets_stdin(char ***target, const char ***write_ref)
221 {
222 int targets = 0, targets_alloc = 0;
223 struct strbuf buf = STRBUF_INIT;
224 *target = NULL; *write_ref = NULL;
225 while (1) {
226 char *rf_one = NULL;
227 char *tg_one;
228
229 if (strbuf_getline_lf(&buf, stdin) == EOF)
230 break;
231 tg_one = buf.buf;
232 rf_one = strchr(tg_one, '\t');
233 if (rf_one)
234 *rf_one++ = 0;
235
236 if (targets >= targets_alloc) {
237 targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
238 REALLOC_ARRAY(*target, targets_alloc);
239 REALLOC_ARRAY(*write_ref, targets_alloc);
240 }
241 (*target)[targets] = xstrdup(tg_one);
242 (*write_ref)[targets] = xstrdup_or_null(rf_one);
243 targets++;
244 }
245 strbuf_release(&buf);
246 return targets;
247 }
248
249 void walker_targets_free(int targets, char **target, const char **write_ref)
250 {
251 while (targets--) {
252 free(target[targets]);
253 if (write_ref)
254 free((char *) write_ref[targets]);
255 }
256 }
257
258 int walker_fetch(struct walker *walker, int targets, char **target,
259 const char **write_ref, const char *write_ref_log_details)
260 {
261 struct strbuf refname = STRBUF_INIT;
262 struct strbuf err = STRBUF_INIT;
263 struct ref_transaction *transaction = NULL;
264 struct object_id *oids = xmalloc(targets * sizeof(struct object_id));
265 char *msg = NULL;
266 int i, ret = -1;
267
268 save_commit_buffer = 0;
269
270 if (write_ref) {
271 transaction = ref_transaction_begin(&err);
272 if (!transaction) {
273 error("%s", err.buf);
274 goto done;
275 }
276 }
277
278 if (!walker->get_recover) {
279 for_each_ref(mark_complete, NULL);
280 commit_list_sort_by_date(&complete);
281 }
282
283 for (i = 0; i < targets; i++) {
284 if (interpret_target(walker, target[i], oids + i)) {
285 error("Could not interpret response from server '%s' as something to pull", target[i]);
286 goto done;
287 }
288 if (process(walker, lookup_unknown_object(&oids[i])))
289 goto done;
290 }
291
292 if (loop(walker))
293 goto done;
294 if (!write_ref) {
295 ret = 0;
296 goto done;
297 }
298 if (write_ref_log_details) {
299 msg = xstrfmt("fetch from %s", write_ref_log_details);
300 } else {
301 msg = NULL;
302 }
303 for (i = 0; i < targets; i++) {
304 if (!write_ref[i])
305 continue;
306 strbuf_reset(&refname);
307 strbuf_addf(&refname, "refs/%s", write_ref[i]);
308 if (ref_transaction_update(transaction, refname.buf,
309 oids + i, NULL, 0,
310 msg ? msg : "fetch (unknown)",
311 &err)) {
312 error("%s", err.buf);
313 goto done;
314 }
315 }
316 if (ref_transaction_commit(transaction, &err)) {
317 error("%s", err.buf);
318 goto done;
319 }
320
321 ret = 0;
322
323 done:
324 ref_transaction_free(transaction);
325 free(msg);
326 free(oids);
327 strbuf_release(&err);
328 strbuf_release(&refname);
329 return ret;
330 }
331
332 void walker_free(struct walker *walker)
333 {
334 walker->cleanup(walker);
335 free(walker);
336 }