Merge https://github.com/prati0100/git-gui
[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 #include "progress.h"
12
13 static struct object_id current_commit_oid;
14
15 void walker_say(struct walker *walker, const char *fmt, ...)
16 {
17         if (walker->get_verbosely) {
18                 va_list ap;
19                 va_start(ap, fmt);
20                 vfprintf(stderr, fmt, ap);
21                 va_end(ap);
22         }
23 }
24
25 static void report_missing(const struct object *obj)
26 {
27         fprintf(stderr, "Cannot obtain needed %s %s\n",
28                 obj->type ? type_name(obj->type): "object",
29                 oid_to_hex(&obj->oid));
30         if (!is_null_oid(&current_commit_oid))
31                 fprintf(stderr, "while processing commit %s.\n",
32                         oid_to_hex(&current_commit_oid));
33 }
34
35 static int process(struct walker *walker, struct object *obj);
36
37 static int process_tree(struct walker *walker, struct tree *tree)
38 {
39         struct tree_desc desc;
40         struct name_entry entry;
41
42         if (parse_tree(tree))
43                 return -1;
44
45         init_tree_desc(&desc, tree->buffer, tree->size);
46         while (tree_entry(&desc, &entry)) {
47                 struct object *obj = NULL;
48
49                 /* submodule commits are not stored in the superproject */
50                 if (S_ISGITLINK(entry.mode))
51                         continue;
52                 if (S_ISDIR(entry.mode)) {
53                         struct tree *tree = lookup_tree(the_repository,
54                                                         &entry.oid);
55                         if (tree)
56                                 obj = &tree->object;
57                 }
58                 else {
59                         struct blob *blob = lookup_blob(the_repository,
60                                                         &entry.oid);
61                         if (blob)
62                                 obj = &blob->object;
63                 }
64                 if (!obj || process(walker, obj))
65                         return -1;
66         }
67         free_tree_buffer(tree);
68         return 0;
69 }
70
71 /* Remember to update object flag allocation in object.h */
72 #define COMPLETE        (1U << 0)
73 #define SEEN            (1U << 1)
74 #define TO_SCAN         (1U << 2)
75
76 static struct commit_list *complete = NULL;
77
78 static int process_commit(struct walker *walker, struct commit *commit)
79 {
80         struct commit_list *parents;
81
82         if (parse_commit(commit))
83                 return -1;
84
85         while (complete && complete->item->date >= commit->date) {
86                 pop_most_recent_commit(&complete, COMPLETE);
87         }
88
89         if (commit->object.flags & COMPLETE)
90                 return 0;
91
92         oidcpy(&current_commit_oid, &commit->object.oid);
93
94         walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
95
96         if (process(walker, &get_commit_tree(commit)->object))
97                 return -1;
98
99         for (parents = commit->parents; parents; parents = parents->next) {
100                 if (process(walker, &parents->item->object))
101                         return -1;
102         }
103
104         return 0;
105 }
106
107 static int process_tag(struct walker *walker, struct tag *tag)
108 {
109         if (parse_tag(tag))
110                 return -1;
111         return process(walker, tag->tagged);
112 }
113
114 static struct object_list *process_queue = NULL;
115 static struct object_list **process_queue_end = &process_queue;
116
117 static int process_object(struct walker *walker, struct object *obj)
118 {
119         if (obj->type == OBJ_COMMIT) {
120                 if (process_commit(walker, (struct commit *)obj))
121                         return -1;
122                 return 0;
123         }
124         if (obj->type == OBJ_TREE) {
125                 if (process_tree(walker, (struct tree *)obj))
126                         return -1;
127                 return 0;
128         }
129         if (obj->type == OBJ_BLOB) {
130                 return 0;
131         }
132         if (obj->type == OBJ_TAG) {
133                 if (process_tag(walker, (struct tag *)obj))
134                         return -1;
135                 return 0;
136         }
137         return error("Unable to determine requirements "
138                      "of type %s for %s",
139                      type_name(obj->type), oid_to_hex(&obj->oid));
140 }
141
142 static int process(struct walker *walker, struct object *obj)
143 {
144         if (obj->flags & SEEN)
145                 return 0;
146         obj->flags |= SEEN;
147
148         if (has_object_file(&obj->oid)) {
149                 /* We already have it, so we should scan it now. */
150                 obj->flags |= TO_SCAN;
151         }
152         else {
153                 if (obj->flags & COMPLETE)
154                         return 0;
155                 walker->prefetch(walker, obj->oid.hash);
156         }
157
158         object_list_insert(obj, process_queue_end);
159         process_queue_end = &(*process_queue_end)->next;
160         return 0;
161 }
162
163 static int loop(struct walker *walker)
164 {
165         struct object_list *elem;
166         struct progress *progress = NULL;
167         uint64_t nr = 0;
168
169         if (walker->get_progress)
170                 progress = start_delayed_progress(_("Fetching objects"), 0);
171
172         while (process_queue) {
173                 struct object *obj = process_queue->item;
174                 elem = process_queue;
175                 process_queue = elem->next;
176                 free(elem);
177                 if (!process_queue)
178                         process_queue_end = &process_queue;
179
180                 /* If we are not scanning this object, we placed it in
181                  * the queue because we needed to fetch it first.
182                  */
183                 if (! (obj->flags & TO_SCAN)) {
184                         if (walker->fetch(walker, obj->oid.hash)) {
185                                 stop_progress(&progress);
186                                 report_missing(obj);
187                                 return -1;
188                         }
189                 }
190                 if (!obj->type)
191                         parse_object(the_repository, &obj->oid);
192                 if (process_object(walker, obj)) {
193                         stop_progress(&progress);
194                         return -1;
195                 }
196                 display_progress(progress, ++nr);
197         }
198         stop_progress(&progress);
199         return 0;
200 }
201
202 static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
203 {
204         if (!get_oid_hex(target, oid))
205                 return 0;
206         if (!check_refname_format(target, 0)) {
207                 struct ref *ref = alloc_ref(target);
208                 if (!walker->fetch_ref(walker, ref)) {
209                         oidcpy(oid, &ref->old_oid);
210                         free(ref);
211                         return 0;
212                 }
213                 free(ref);
214         }
215         return -1;
216 }
217
218 static int mark_complete(const char *path, const struct object_id *oid,
219                          int flag, void *cb_data)
220 {
221         struct commit *commit = lookup_commit_reference_gently(the_repository,
222                                                                oid, 1);
223
224         if (commit) {
225                 commit->object.flags |= COMPLETE;
226                 commit_list_insert(commit, &complete);
227         }
228         return 0;
229 }
230
231 int walker_targets_stdin(char ***target, const char ***write_ref)
232 {
233         int targets = 0, targets_alloc = 0;
234         struct strbuf buf = STRBUF_INIT;
235         *target = NULL; *write_ref = NULL;
236         while (1) {
237                 char *rf_one = NULL;
238                 char *tg_one;
239
240                 if (strbuf_getline_lf(&buf, stdin) == EOF)
241                         break;
242                 tg_one = buf.buf;
243                 rf_one = strchr(tg_one, '\t');
244                 if (rf_one)
245                         *rf_one++ = 0;
246
247                 if (targets >= targets_alloc) {
248                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
249                         REALLOC_ARRAY(*target, targets_alloc);
250                         REALLOC_ARRAY(*write_ref, targets_alloc);
251                 }
252                 (*target)[targets] = xstrdup(tg_one);
253                 (*write_ref)[targets] = xstrdup_or_null(rf_one);
254                 targets++;
255         }
256         strbuf_release(&buf);
257         return targets;
258 }
259
260 void walker_targets_free(int targets, char **target, const char **write_ref)
261 {
262         while (targets--) {
263                 free(target[targets]);
264                 if (write_ref)
265                         free((char *) write_ref[targets]);
266         }
267 }
268
269 int walker_fetch(struct walker *walker, int targets, char **target,
270                  const char **write_ref, const char *write_ref_log_details)
271 {
272         struct strbuf refname = STRBUF_INIT;
273         struct strbuf err = STRBUF_INIT;
274         struct ref_transaction *transaction = NULL;
275         struct object_id *oids;
276         char *msg = NULL;
277         int i, ret = -1;
278
279         save_commit_buffer = 0;
280
281         ALLOC_ARRAY(oids, targets);
282
283         if (write_ref) {
284                 transaction = ref_transaction_begin(&err);
285                 if (!transaction) {
286                         error("%s", err.buf);
287                         goto done;
288                 }
289         }
290
291         if (!walker->get_recover) {
292                 for_each_ref(mark_complete, NULL);
293                 commit_list_sort_by_date(&complete);
294         }
295
296         for (i = 0; i < targets; i++) {
297                 if (interpret_target(walker, target[i], oids + i)) {
298                         error("Could not interpret response from server '%s' as something to pull", target[i]);
299                         goto done;
300                 }
301                 if (process(walker, lookup_unknown_object(&oids[i])))
302                         goto done;
303         }
304
305         if (loop(walker))
306                 goto done;
307         if (!write_ref) {
308                 ret = 0;
309                 goto done;
310         }
311         if (write_ref_log_details) {
312                 msg = xstrfmt("fetch from %s", write_ref_log_details);
313         } else {
314                 msg = NULL;
315         }
316         for (i = 0; i < targets; i++) {
317                 if (!write_ref[i])
318                         continue;
319                 strbuf_reset(&refname);
320                 strbuf_addf(&refname, "refs/%s", write_ref[i]);
321                 if (ref_transaction_update(transaction, refname.buf,
322                                            oids + i, NULL, 0,
323                                            msg ? msg : "fetch (unknown)",
324                                            &err)) {
325                         error("%s", err.buf);
326                         goto done;
327                 }
328         }
329         if (ref_transaction_commit(transaction, &err)) {
330                 error("%s", err.buf);
331                 goto done;
332         }
333
334         ret = 0;
335
336 done:
337         ref_transaction_free(transaction);
338         free(msg);
339         free(oids);
340         strbuf_release(&err);
341         strbuf_release(&refname);
342         return ret;
343 }
344
345 void walker_free(struct walker *walker)
346 {
347         walker->cleanup(walker);
348         free(walker);
349 }