strbuf: introduce strbuf_getline_{lf,nul}()
[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 fprintf(stderr, "Cannot obtain needed %s %s\n",
21 obj->type ? typename(obj->type): "object",
22 oid_to_hex(&obj->oid));
23 if (!is_null_sha1(current_commit_sha1))
24 fprintf(stderr, "while processing commit %s.\n",
25 sha1_to_hex(current_commit_sha1));
26 }
27
28 static int process(struct walker *walker, struct object *obj);
29
30 static int process_tree(struct walker *walker, struct tree *tree)
31 {
32 struct tree_desc desc;
33 struct name_entry entry;
34
35 if (parse_tree(tree))
36 return -1;
37
38 init_tree_desc(&desc, tree->buffer, tree->size);
39 while (tree_entry(&desc, &entry)) {
40 struct object *obj = NULL;
41
42 /* submodule commits are not stored in the superproject */
43 if (S_ISGITLINK(entry.mode))
44 continue;
45 if (S_ISDIR(entry.mode)) {
46 struct tree *tree = lookup_tree(entry.sha1);
47 if (tree)
48 obj = &tree->object;
49 }
50 else {
51 struct blob *blob = lookup_blob(entry.sha1);
52 if (blob)
53 obj = &blob->object;
54 }
55 if (!obj || process(walker, obj))
56 return -1;
57 }
58 free_tree_buffer(tree);
59 return 0;
60 }
61
62 /* Remember to update object flag allocation in object.h */
63 #define COMPLETE (1U << 0)
64 #define SEEN (1U << 1)
65 #define TO_SCAN (1U << 2)
66
67 static struct commit_list *complete = NULL;
68
69 static int process_commit(struct walker *walker, struct commit *commit)
70 {
71 if (parse_commit(commit))
72 return -1;
73
74 while (complete && complete->item->date >= commit->date) {
75 pop_most_recent_commit(&complete, COMPLETE);
76 }
77
78 if (commit->object.flags & COMPLETE)
79 return 0;
80
81 hashcpy(current_commit_sha1, commit->object.oid.hash);
82
83 walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
84
85 if (walker->get_tree) {
86 if (process(walker, &commit->tree->object))
87 return -1;
88 if (!walker->get_all)
89 walker->get_tree = 0;
90 }
91 if (walker->get_history) {
92 struct commit_list *parents = commit->parents;
93 for (; parents; parents = parents->next) {
94 if (process(walker, &parents->item->object))
95 return -1;
96 }
97 }
98 return 0;
99 }
100
101 static int process_tag(struct walker *walker, struct tag *tag)
102 {
103 if (parse_tag(tag))
104 return -1;
105 return process(walker, tag->tagged);
106 }
107
108 static struct object_list *process_queue = NULL;
109 static struct object_list **process_queue_end = &process_queue;
110
111 static int process_object(struct walker *walker, struct object *obj)
112 {
113 if (obj->type == OBJ_COMMIT) {
114 if (process_commit(walker, (struct commit *)obj))
115 return -1;
116 return 0;
117 }
118 if (obj->type == OBJ_TREE) {
119 if (process_tree(walker, (struct tree *)obj))
120 return -1;
121 return 0;
122 }
123 if (obj->type == OBJ_BLOB) {
124 return 0;
125 }
126 if (obj->type == OBJ_TAG) {
127 if (process_tag(walker, (struct tag *)obj))
128 return -1;
129 return 0;
130 }
131 return error("Unable to determine requirements "
132 "of type %s for %s",
133 typename(obj->type), oid_to_hex(&obj->oid));
134 }
135
136 static int process(struct walker *walker, struct object *obj)
137 {
138 if (obj->flags & SEEN)
139 return 0;
140 obj->flags |= SEEN;
141
142 if (has_object_file(&obj->oid)) {
143 /* We already have it, so we should scan it now. */
144 obj->flags |= TO_SCAN;
145 }
146 else {
147 if (obj->flags & COMPLETE)
148 return 0;
149 walker->prefetch(walker, obj->oid.hash);
150 }
151
152 object_list_insert(obj, process_queue_end);
153 process_queue_end = &(*process_queue_end)->next;
154 return 0;
155 }
156
157 static int loop(struct walker *walker)
158 {
159 struct object_list *elem;
160
161 while (process_queue) {
162 struct object *obj = process_queue->item;
163 elem = process_queue;
164 process_queue = elem->next;
165 free(elem);
166 if (!process_queue)
167 process_queue_end = &process_queue;
168
169 /* If we are not scanning this object, we placed it in
170 * the queue because we needed to fetch it first.
171 */
172 if (! (obj->flags & TO_SCAN)) {
173 if (walker->fetch(walker, obj->oid.hash)) {
174 report_missing(obj);
175 return -1;
176 }
177 }
178 if (!obj->type)
179 parse_object(obj->oid.hash);
180 if (process_object(walker, obj))
181 return -1;
182 }
183 return 0;
184 }
185
186 static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
187 {
188 if (!get_sha1_hex(target, sha1))
189 return 0;
190 if (!check_refname_format(target, 0)) {
191 struct ref *ref = alloc_ref(target);
192 if (!walker->fetch_ref(walker, ref)) {
193 hashcpy(sha1, ref->old_oid.hash);
194 free(ref);
195 return 0;
196 }
197 free(ref);
198 }
199 return -1;
200 }
201
202 static int mark_complete(const char *path, const struct object_id *oid,
203 int flag, void *cb_data)
204 {
205 struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
206
207 if (commit) {
208 commit->object.flags |= COMPLETE;
209 commit_list_insert(commit, &complete);
210 }
211 return 0;
212 }
213
214 int walker_targets_stdin(char ***target, const char ***write_ref)
215 {
216 int targets = 0, targets_alloc = 0;
217 struct strbuf buf = STRBUF_INIT;
218 *target = NULL; *write_ref = NULL;
219 while (1) {
220 char *rf_one = NULL;
221 char *tg_one;
222
223 if (strbuf_getline_lf(&buf, stdin) == EOF)
224 break;
225 tg_one = buf.buf;
226 rf_one = strchr(tg_one, '\t');
227 if (rf_one)
228 *rf_one++ = 0;
229
230 if (targets >= targets_alloc) {
231 targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
232 REALLOC_ARRAY(*target, targets_alloc);
233 REALLOC_ARRAY(*write_ref, targets_alloc);
234 }
235 (*target)[targets] = xstrdup(tg_one);
236 (*write_ref)[targets] = xstrdup_or_null(rf_one);
237 targets++;
238 }
239 strbuf_release(&buf);
240 return targets;
241 }
242
243 void walker_targets_free(int targets, char **target, const char **write_ref)
244 {
245 while (targets--) {
246 free(target[targets]);
247 if (write_ref)
248 free((char *) write_ref[targets]);
249 }
250 }
251
252 int walker_fetch(struct walker *walker, int targets, char **target,
253 const char **write_ref, const char *write_ref_log_details)
254 {
255 struct strbuf refname = STRBUF_INIT;
256 struct strbuf err = STRBUF_INIT;
257 struct ref_transaction *transaction = NULL;
258 unsigned char *sha1 = xmalloc(targets * 20);
259 char *msg = NULL;
260 int i, ret = -1;
261
262 save_commit_buffer = 0;
263
264 if (write_ref) {
265 transaction = ref_transaction_begin(&err);
266 if (!transaction) {
267 error("%s", err.buf);
268 goto done;
269 }
270 }
271
272 if (!walker->get_recover) {
273 for_each_ref(mark_complete, NULL);
274 commit_list_sort_by_date(&complete);
275 }
276
277 for (i = 0; i < targets; i++) {
278 if (interpret_target(walker, target[i], &sha1[20 * i])) {
279 error("Could not interpret response from server '%s' as something to pull", target[i]);
280 goto done;
281 }
282 if (process(walker, lookup_unknown_object(&sha1[20 * i])))
283 goto done;
284 }
285
286 if (loop(walker))
287 goto done;
288 if (!write_ref) {
289 ret = 0;
290 goto done;
291 }
292 if (write_ref_log_details) {
293 msg = xstrfmt("fetch from %s", write_ref_log_details);
294 } else {
295 msg = NULL;
296 }
297 for (i = 0; i < targets; i++) {
298 if (!write_ref[i])
299 continue;
300 strbuf_reset(&refname);
301 strbuf_addf(&refname, "refs/%s", write_ref[i]);
302 if (ref_transaction_update(transaction, refname.buf,
303 &sha1[20 * i], NULL, 0,
304 msg ? msg : "fetch (unknown)",
305 &err)) {
306 error("%s", err.buf);
307 goto done;
308 }
309 }
310 if (ref_transaction_commit(transaction, &err)) {
311 error("%s", err.buf);
312 goto done;
313 }
314
315 ret = 0;
316
317 done:
318 ref_transaction_free(transaction);
319 free(msg);
320 free(sha1);
321 strbuf_release(&err);
322 strbuf_release(&refname);
323 return ret;
324 }
325
326 void walker_free(struct walker *walker)
327 {
328 walker->cleanup(walker);
329 free(walker);
330 }