Merge branch 'en/rev-parse-invalid-range'
[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 struct object_id current_commit_oid;
11
12 void walker_say(struct walker *walker, const char *fmt, ...)
13 {
14         if (walker->get_verbosely) {
15                 va_list ap;
16                 va_start(ap, fmt);
17                 vfprintf(stderr, fmt, ap);
18                 va_end(ap);
19         }
20 }
21
22 static void report_missing(const struct object *obj)
23 {
24         fprintf(stderr, "Cannot obtain needed %s %s\n",
25                 obj->type ? type_name(obj->type): "object",
26                 oid_to_hex(&obj->oid));
27         if (!is_null_oid(&current_commit_oid))
28                 fprintf(stderr, "while processing commit %s.\n",
29                         oid_to_hex(&current_commit_oid));
30 }
31
32 static int process(struct walker *walker, struct object *obj);
33
34 static int process_tree(struct walker *walker, struct tree *tree)
35 {
36         struct tree_desc desc;
37         struct name_entry entry;
38
39         if (parse_tree(tree))
40                 return -1;
41
42         init_tree_desc(&desc, tree->buffer, tree->size);
43         while (tree_entry(&desc, &entry)) {
44                 struct object *obj = NULL;
45
46                 /* submodule commits are not stored in the superproject */
47                 if (S_ISGITLINK(entry.mode))
48                         continue;
49                 if (S_ISDIR(entry.mode)) {
50                         struct tree *tree = lookup_tree(entry.oid);
51                         if (tree)
52                                 obj = &tree->object;
53                 }
54                 else {
55                         struct blob *blob = lookup_blob(entry.oid);
56                         if (blob)
57                                 obj = &blob->object;
58                 }
59                 if (!obj || process(walker, obj))
60                         return -1;
61         }
62         free_tree_buffer(tree);
63         return 0;
64 }
65
66 /* Remember to update object flag allocation in object.h */
67 #define COMPLETE        (1U << 0)
68 #define SEEN            (1U << 1)
69 #define TO_SCAN         (1U << 2)
70
71 static struct commit_list *complete = NULL;
72
73 static int process_commit(struct walker *walker, struct commit *commit)
74 {
75         struct commit_list *parents;
76
77         if (parse_commit(commit))
78                 return -1;
79
80         while (complete && complete->item->date >= commit->date) {
81                 pop_most_recent_commit(&complete, COMPLETE);
82         }
83
84         if (commit->object.flags & COMPLETE)
85                 return 0;
86
87         oidcpy(&current_commit_oid, &commit->object.oid);
88
89         walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
90
91         if (process(walker, &get_commit_tree(commit)->object))
92                 return -1;
93
94         for (parents = commit->parents; 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                      type_name(obj->type), oid_to_hex(&obj->oid));
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_object_file(&obj->oid)) {
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->oid.hash);
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->oid.hash)) {
175                                 report_missing(obj);
176                                 return -1;
177                         }
178                 }
179                 if (!obj->type)
180                         parse_object(&obj->oid);
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, struct object_id *oid)
188 {
189         if (!get_oid_hex(target, oid))
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                         oidcpy(oid, &ref->old_oid);
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 struct object_id *oid,
204                          int flag, void *cb_data)
205 {
206         struct commit *commit = lookup_commit_reference_gently(oid, 1);
207
208         if (commit) {
209                 commit->object.flags |= COMPLETE;
210                 commit_list_insert(commit, &complete);
211         }
212         return 0;
213 }
214
215 int walker_targets_stdin(char ***target, const char ***write_ref)
216 {
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;
223
224                 if (strbuf_getline_lf(&buf, stdin) == EOF)
225                         break;
226                 tg_one = buf.buf;
227                 rf_one = strchr(tg_one, '\t');
228                 if (rf_one)
229                         *rf_one++ = 0;
230
231                 if (targets >= targets_alloc) {
232                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
233                         REALLOC_ARRAY(*target, targets_alloc);
234                         REALLOC_ARRAY(*write_ref, targets_alloc);
235                 }
236                 (*target)[targets] = xstrdup(tg_one);
237                 (*write_ref)[targets] = xstrdup_or_null(rf_one);
238                 targets++;
239         }
240         strbuf_release(&buf);
241         return targets;
242 }
243
244 void walker_targets_free(int targets, char **target, const char **write_ref)
245 {
246         while (targets--) {
247                 free(target[targets]);
248                 if (write_ref)
249                         free((char *) write_ref[targets]);
250         }
251 }
252
253 int walker_fetch(struct walker *walker, int targets, char **target,
254                  const char **write_ref, const char *write_ref_log_details)
255 {
256         struct strbuf refname = STRBUF_INIT;
257         struct strbuf err = STRBUF_INIT;
258         struct ref_transaction *transaction = NULL;
259         struct object_id *oids = xmalloc(targets * sizeof(struct object_id));
260         char *msg = NULL;
261         int i, ret = -1;
262
263         save_commit_buffer = 0;
264
265         if (write_ref) {
266                 transaction = ref_transaction_begin(&err);
267                 if (!transaction) {
268                         error("%s", err.buf);
269                         goto done;
270                 }
271         }
272
273         if (!walker->get_recover) {
274                 for_each_ref(mark_complete, NULL);
275                 commit_list_sort_by_date(&complete);
276         }
277
278         for (i = 0; i < targets; i++) {
279                 if (interpret_target(walker, target[i], oids + i)) {
280                         error("Could not interpret response from server '%s' as something to pull", target[i]);
281                         goto done;
282                 }
283                 if (process(walker, lookup_unknown_object(oids[i].hash)))
284                         goto done;
285         }
286
287         if (loop(walker))
288                 goto done;
289         if (!write_ref) {
290                 ret = 0;
291                 goto done;
292         }
293         if (write_ref_log_details) {
294                 msg = xstrfmt("fetch from %s", write_ref_log_details);
295         } else {
296                 msg = NULL;
297         }
298         for (i = 0; i < targets; i++) {
299                 if (!write_ref[i])
300                         continue;
301                 strbuf_reset(&refname);
302                 strbuf_addf(&refname, "refs/%s", write_ref[i]);
303                 if (ref_transaction_update(transaction, refname.buf,
304                                            oids + i, NULL, 0,
305                                            msg ? msg : "fetch (unknown)",
306                                            &err)) {
307                         error("%s", err.buf);
308                         goto done;
309                 }
310         }
311         if (ref_transaction_commit(transaction, &err)) {
312                 error("%s", err.buf);
313                 goto done;
314         }
315
316         ret = 0;
317
318 done:
319         ref_transaction_free(transaction);
320         free(msg);
321         free(oids);
322         strbuf_release(&err);
323         strbuf_release(&refname);
324         return ret;
325 }
326
327 void walker_free(struct walker *walker)
328 {
329         walker->cleanup(walker);
330         free(walker);
331 }