Initialize tree descriptors with a helper function rather than by hand.
[git/git.git] / fetch.c
1 #include "cache.h"
2 #include "fetch.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 #include "strbuf.h"
10
11 int get_tree = 0;
12 int get_history = 0;
13 int get_all = 0;
14 int get_verbosely = 0;
15 int get_recover = 0;
16 static unsigned char current_commit_sha1[20];
17
18 void pull_say(const char *fmt, const char *hex)
19 {
20 if (get_verbosely)
21 fprintf(stderr, fmt, hex);
22 }
23
24 static void report_missing(const struct object *obj)
25 {
26 char missing_hex[41];
27 strcpy(missing_hex, sha1_to_hex(obj->sha1));;
28 fprintf(stderr, "Cannot obtain needed %s %s\n",
29 obj->type ? typename(obj->type): "object", missing_hex);
30 if (!is_null_sha1(current_commit_sha1))
31 fprintf(stderr, "while processing commit %s.\n",
32 sha1_to_hex(current_commit_sha1));
33 }
34
35 static int process(struct object *obj);
36
37 static int process_tree(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 if (S_ISDIR(entry.mode)) {
50 struct tree *tree = lookup_tree(entry.sha1);
51 if (tree)
52 obj = &tree->object;
53 }
54 else {
55 struct blob *blob = lookup_blob(entry.sha1);
56 if (blob)
57 obj = &blob->object;
58 }
59 if (!obj || process(obj))
60 return -1;
61 }
62 free(tree->buffer);
63 tree->buffer = NULL;
64 tree->size = 0;
65 return 0;
66 }
67
68 #define COMPLETE (1U << 0)
69 #define SEEN (1U << 1)
70 #define TO_SCAN (1U << 2)
71
72 static struct commit_list *complete = NULL;
73
74 static int process_commit(struct commit *commit)
75 {
76 if (parse_commit(commit))
77 return -1;
78
79 while (complete && complete->item->date >= commit->date) {
80 pop_most_recent_commit(&complete, COMPLETE);
81 }
82
83 if (commit->object.flags & COMPLETE)
84 return 0;
85
86 hashcpy(current_commit_sha1, commit->object.sha1);
87
88 pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
89
90 if (get_tree) {
91 if (process(&commit->tree->object))
92 return -1;
93 if (!get_all)
94 get_tree = 0;
95 }
96 if (get_history) {
97 struct commit_list *parents = commit->parents;
98 for (; parents; parents = parents->next) {
99 if (process(&parents->item->object))
100 return -1;
101 }
102 }
103 return 0;
104 }
105
106 static int process_tag(struct tag *tag)
107 {
108 if (parse_tag(tag))
109 return -1;
110 return process(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 object *obj)
117 {
118 if (obj->type == OBJ_COMMIT) {
119 if (process_commit((struct commit *)obj))
120 return -1;
121 return 0;
122 }
123 if (obj->type == OBJ_TREE) {
124 if (process_tree((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((struct tag *)obj))
133 return -1;
134 return 0;
135 }
136 return error("Unable to determine requirements "
137 "of type %s for %s",
138 typename(obj->type), sha1_to_hex(obj->sha1));
139 }
140
141 static int process(struct object *obj)
142 {
143 if (obj->flags & SEEN)
144 return 0;
145 obj->flags |= SEEN;
146
147 if (has_sha1_file(obj->sha1)) {
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 prefetch(obj->sha1);
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(void)
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 (fetch(obj->sha1)) {
179 report_missing(obj);
180 return -1;
181 }
182 }
183 if (!obj->type)
184 parse_object(obj->sha1);
185 if (process_object(obj))
186 return -1;
187 }
188 return 0;
189 }
190
191 static int interpret_target(char *target, unsigned char *sha1)
192 {
193 if (!get_sha1_hex(target, sha1))
194 return 0;
195 if (!check_ref_format(target)) {
196 if (!fetch_ref(target, sha1)) {
197 return 0;
198 }
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 insert_by_date(commit, &complete);
209 }
210 return 0;
211 }
212
213 int pull_targets_stdin(char ***target, const char ***write_ref)
214 {
215 int targets = 0, targets_alloc = 0;
216 struct strbuf buf;
217 *target = NULL; *write_ref = NULL;
218 strbuf_init(&buf);
219 while (1) {
220 char *rf_one = NULL;
221 char *tg_one;
222
223 read_line(&buf, stdin, '\n');
224 if (buf.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 *target = xrealloc(*target, targets_alloc * sizeof(**target));
234 *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
235 }
236 (*target)[targets] = xstrdup(tg_one);
237 (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
238 targets++;
239 }
240 return targets;
241 }
242
243 void pull_targets_free(int targets, char **target, const char **write_ref)
244 {
245 while (targets--) {
246 free(target[targets]);
247 if (write_ref && write_ref[targets])
248 free((char *) write_ref[targets]);
249 }
250 }
251
252 int pull(int targets, char **target, const char **write_ref,
253 const char *write_ref_log_details)
254 {
255 struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
256 unsigned char *sha1 = xmalloc(targets * 20);
257 char *msg;
258 int ret;
259 int i;
260
261 save_commit_buffer = 0;
262 track_object_refs = 0;
263
264 for (i = 0; i < targets; i++) {
265 if (!write_ref || !write_ref[i])
266 continue;
267
268 lock[i] = lock_ref_sha1(write_ref[i], NULL);
269 if (!lock[i]) {
270 error("Can't lock ref %s", write_ref[i]);
271 goto unlock_and_fail;
272 }
273 }
274
275 if (!get_recover)
276 for_each_ref(mark_complete, NULL);
277
278 for (i = 0; i < targets; i++) {
279 if (interpret_target(target[i], &sha1[20 * i])) {
280 error("Could not interpret %s as something to pull", target[i]);
281 goto unlock_and_fail;
282 }
283 if (process(lookup_unknown_object(&sha1[20 * i])))
284 goto unlock_and_fail;
285 }
286
287 if (loop())
288 goto unlock_and_fail;
289
290 if (write_ref_log_details) {
291 msg = xmalloc(strlen(write_ref_log_details) + 12);
292 sprintf(msg, "fetch from %s", write_ref_log_details);
293 } else {
294 msg = NULL;
295 }
296 for (i = 0; i < targets; i++) {
297 if (!write_ref || !write_ref[i])
298 continue;
299 ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
300 lock[i] = NULL;
301 if (ret)
302 goto unlock_and_fail;
303 }
304 free(msg);
305
306 return 0;
307
308
309 unlock_and_fail:
310 for (i = 0; i < targets; i++)
311 if (lock[i])
312 unlock_ref(lock[i]);
313 return -1;
314 }