refs.c: convert it to use lockfile interface.
[git/git.git] / fetch.c
CommitLineData
215a7ad1 1#include "fetch.h"
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2
3#include "cache.h"
4#include "commit.h"
5#include "tree.h"
1bc995a3 6#include "tree-walk.h"
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7#include "tag.h"
8#include "blob.h"
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9#include "refs.h"
10
11const char *write_ref = NULL;
d0740d92 12const char *write_ref_log_details = NULL;
cd541a68 13
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14int get_tree = 0;
15int get_history = 0;
16int get_all = 0;
e78d9772 17int get_verbosely = 0;
820eca68 18int get_recover = 0;
b2d62f16 19static unsigned char current_commit_sha1[20];
4250a5e5 20
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DB
21void pull_say(const char *fmt, const char *hex)
22{
e78d9772
JH
23 if (get_verbosely)
24 fprintf(stderr, fmt, hex);
25}
26
b2d62f16
JH
27static void report_missing(const char *what, const unsigned char *missing)
28{
29 char missing_hex[41];
30
31 strcpy(missing_hex, sha1_to_hex(missing));;
32 fprintf(stderr,
33 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
34 what, missing_hex, sha1_to_hex(current_commit_sha1));
35}
36
80077f07 37static int process(struct object *obj);
3173bd49 38
1e8be59d 39static int process_tree(struct tree *tree)
4250a5e5 40{
1bc995a3 41 struct tree_desc desc;
4c068a98 42 struct name_entry entry;
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43
44 if (parse_tree(tree))
45 return -1;
46
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LT
47 desc.buf = tree->buffer;
48 desc.size = tree->size;
4c068a98 49 while (tree_entry(&desc, &entry)) {
6f9012b6
JH
50 struct object *obj = NULL;
51
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LT
52 if (S_ISDIR(entry.mode)) {
53 struct tree *tree = lookup_tree(entry.sha1);
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JH
54 if (tree)
55 obj = &tree->object;
56 }
57 else {
4c068a98 58 struct blob *blob = lookup_blob(entry.sha1);
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JH
59 if (blob)
60 obj = &blob->object;
2d9c58c6 61 }
6f9012b6 62 if (!obj || process(obj))
4250a5e5 63 return -1;
4250a5e5 64 }
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LT
65 free(tree->buffer);
66 tree->buffer = NULL;
1bc995a3 67 tree->size = 0;
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DB
68 return 0;
69}
70
24451c31
SV
71#define COMPLETE (1U << 0)
72#define SEEN (1U << 1)
73#define TO_SCAN (1U << 2)
85d106c2 74
d0ac30f2 75static struct commit_list *complete = NULL;
22c6e1d0 76
1e8be59d 77static int process_commit(struct commit *commit)
4250a5e5 78{
1e8be59d 79 if (parse_commit(commit))
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80 return -1;
81
22c6e1d0 82 while (complete && complete->item->date >= commit->date) {
d0ac30f2 83 pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0 84 }
22c6e1d0 85
d0ac30f2 86 if (commit->object.flags & COMPLETE)
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DB
87 return 0;
88
1e8be59d 89 memcpy(current_commit_sha1, commit->object.sha1, 20);
4250a5e5 90
85d106c2
JH
91 pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
92
4250a5e5 93 if (get_tree) {
80077f07 94 if (process(&commit->tree->object))
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95 return -1;
96 if (!get_all)
97 get_tree = 0;
98 }
99 if (get_history) {
1e8be59d 100 struct commit_list *parents = commit->parents;
4250a5e5 101 for (; parents; parents = parents->next) {
80077f07 102 if (process(&parents->item->object))
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103 return -1;
104 }
105 }
106 return 0;
107}
108
1e8be59d 109static int process_tag(struct tag *tag)
3173bd49 110{
1e8be59d 111 if (parse_tag(tag))
3173bd49 112 return -1;
80077f07 113 return process(tag->tagged);
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DB
114}
115
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116static struct object_list *process_queue = NULL;
117static struct object_list **process_queue_end = &process_queue;
118
f88fcf8b 119static int process_object(struct object *obj)
3173bd49 120{
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DB
121 if (obj->type == commit_type) {
122 if (process_commit((struct commit *)obj))
123 return -1;
124 return 0;
125 }
126 if (obj->type == tree_type) {
127 if (process_tree((struct tree *)obj))
128 return -1;
129 return 0;
130 }
131 if (obj->type == blob_type) {
132 return 0;
133 }
134 if (obj->type == tag_type) {
135 if (process_tag((struct tag *)obj))
136 return -1;
3173bd49 137 return 0;
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DB
138 }
139 return error("Unable to determine requirements "
140 "of type %s for %s",
141 obj->type, sha1_to_hex(obj->sha1));
142}
143
80077f07 144static int process(struct object *obj)
f88fcf8b 145{
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SV
146 if (obj->flags & SEEN)
147 return 0;
148 obj->flags |= SEEN;
149
80077f07 150 if (has_sha1_file(obj->sha1)) {
f88fcf8b 151 /* We already have it, so we should scan it now. */
85d106c2 152 obj->flags |= TO_SCAN;
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SV
153 } else {
154 if (obj->flags & COMPLETE)
155 return 0;
156 prefetch(obj->sha1);
f88fcf8b 157 }
7b64d06b 158
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DB
159 object_list_insert(obj, process_queue_end);
160 process_queue_end = &(*process_queue_end)->next;
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DB
161 return 0;
162}
163
164static int loop(void)
165{
85d106c2
JH
166 struct object_list *elem;
167
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DB
168 while (process_queue) {
169 struct object *obj = process_queue->item;
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JH
170 elem = process_queue;
171 process_queue = elem->next;
172 free(elem);
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DB
173 if (!process_queue)
174 process_queue_end = &process_queue;
175
85d106c2
JH
176 /* If we are not scanning this object, we placed it in
177 * the queue because we needed to fetch it first.
178 */
179 if (! (obj->flags & TO_SCAN)) {
11f0dafe 180 if (fetch(obj->sha1)) {
85d106c2
JH
181 report_missing(obj->type
182 ? obj->type
183 : "object", obj->sha1);
184 return -1;
185 }
186 }
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DB
187 if (!obj->type)
188 parse_object(obj->sha1);
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DB
189 if (process_object(obj))
190 return -1;
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191 }
192 return 0;
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193}
194
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195static int interpret_target(char *target, unsigned char *sha1)
196{
197 if (!get_sha1_hex(target, sha1))
198 return 0;
199 if (!check_ref_format(target)) {
200 if (!fetch_ref(target, sha1)) {
201 return 0;
202 }
203 }
204 return -1;
205}
206
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DB
207static int mark_complete(const char *path, const unsigned char *sha1)
208{
d0ac30f2
JH
209 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
210 if (commit) {
211 commit->object.flags |= COMPLETE;
212 insert_by_date(commit, &complete);
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213 }
214 return 0;
215}
cd541a68 216
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217int pull(char *target)
218{
99bd0f55 219 struct ref_lock *lock = NULL;
4250a5e5 220 unsigned char sha1[20];
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SP
221 char *msg;
222 int ret;
cd541a68 223
98533b90 224 save_commit_buffer = 0;
a95cb6fb 225 track_object_refs = 0;
4bd18c43 226 if (write_ref) {
a5c8a98c 227 lock = lock_ref_sha1(write_ref, NULL, 0);
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SP
228 if (!lock) {
229 error("Can't lock ref %s", write_ref);
cd541a68 230 return -1;
d0740d92 231 }
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232 }
233
84c667ff 234 if (!get_recover)
820eca68 235 for_each_ref(mark_complete);
22c6e1d0 236
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SP
237 if (interpret_target(target, sha1)) {
238 error("Could not interpret %s as something to pull", target);
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JH
239 if (lock)
240 unlock_ref(lock);
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SP
241 return -1;
242 }
243 if (process(lookup_unknown_object(sha1))) {
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JH
244 if (lock)
245 unlock_ref(lock);
1e8be59d 246 return -1;
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SP
247 }
248 if (loop()) {
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JH
249 if (lock)
250 unlock_ref(lock);
cd541a68 251 return -1;
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SP
252 }
253
cd541a68 254 if (write_ref) {
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SP
255 if (write_ref_log_details) {
256 msg = xmalloc(strlen(write_ref_log_details) + 12);
257 sprintf(msg, "fetch from %s", write_ref_log_details);
258 } else
259 msg = NULL;
260 ret = write_ref_sha1(lock, sha1, msg ? msg : "fetch (unknown)");
261 if (msg)
262 free(msg);
263 return ret;
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264 }
265 return 0;
4250a5e5 266}