Merge branch 'ml/trace'
[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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21void pull_say(const char *fmt, const char *hex)
22{
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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)) {
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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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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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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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87 return 0;
88
1e8be59d 89 memcpy(current_commit_sha1, commit->object.sha1, 20);
4250a5e5 90
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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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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{
885a86ab 121 if (obj->type == TYPE_COMMIT) {
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122 if (process_commit((struct commit *)obj))
123 return -1;
124 return 0;
125 }
885a86ab 126 if (obj->type == TYPE_TREE) {
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127 if (process_tree((struct tree *)obj))
128 return -1;
129 return 0;
130 }
885a86ab 131 if (obj->type == TYPE_BLOB) {
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132 return 0;
133 }
885a86ab 134 if (obj->type == TYPE_TAG) {
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135 if (process_tag((struct tag *)obj))
136 return -1;
3173bd49 137 return 0;
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138 }
139 return error("Unable to determine requirements "
140 "of type %s for %s",
885a86ab 141 typename(obj->type), sha1_to_hex(obj->sha1));
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142}
143
80077f07 144static int process(struct object *obj)
f88fcf8b 145{
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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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JH
153 }
154 else {
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SV
155 if (obj->flags & COMPLETE)
156 return 0;
157 prefetch(obj->sha1);
f88fcf8b 158 }
7b64d06b 159
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160 object_list_insert(obj, process_queue_end);
161 process_queue_end = &(*process_queue_end)->next;
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162 return 0;
163}
164
165static int loop(void)
166{
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JH
167 struct object_list *elem;
168
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DB
169 while (process_queue) {
170 struct object *obj = process_queue->item;
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JH
171 elem = process_queue;
172 process_queue = elem->next;
173 free(elem);
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DB
174 if (!process_queue)
175 process_queue_end = &process_queue;
176
85d106c2
JH
177 /* If we are not scanning this object, we placed it in
178 * the queue because we needed to fetch it first.
179 */
180 if (! (obj->flags & TO_SCAN)) {
11f0dafe 181 if (fetch(obj->sha1)) {
885a86ab 182 report_missing(typename(obj->type), obj->sha1);
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JH
183 return -1;
184 }
185 }
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DB
186 if (!obj->type)
187 parse_object(obj->sha1);
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DB
188 if (process_object(obj))
189 return -1;
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190 }
191 return 0;
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192}
193
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194static int interpret_target(char *target, unsigned char *sha1)
195{
196 if (!get_sha1_hex(target, sha1))
197 return 0;
198 if (!check_ref_format(target)) {
199 if (!fetch_ref(target, sha1)) {
200 return 0;
201 }
202 }
203 return -1;
204}
205
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206static int mark_complete(const char *path, const unsigned char *sha1)
207{
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208 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
209 if (commit) {
210 commit->object.flags |= COMPLETE;
211 insert_by_date(commit, &complete);
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212 }
213 return 0;
214}
cd541a68 215
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216int pull(char *target)
217{
99bd0f55 218 struct ref_lock *lock = NULL;
4250a5e5 219 unsigned char sha1[20];
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SP
220 char *msg;
221 int ret;
cd541a68 222
98533b90 223 save_commit_buffer = 0;
a95cb6fb 224 track_object_refs = 0;
4bd18c43 225 if (write_ref) {
a5c8a98c 226 lock = lock_ref_sha1(write_ref, NULL, 0);
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SP
227 if (!lock) {
228 error("Can't lock ref %s", write_ref);
cd541a68 229 return -1;
d0740d92 230 }
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231 }
232
84c667ff 233 if (!get_recover)
820eca68 234 for_each_ref(mark_complete);
22c6e1d0 235
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236 if (interpret_target(target, sha1)) {
237 error("Could not interpret %s as something to pull", target);
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238 if (lock)
239 unlock_ref(lock);
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SP
240 return -1;
241 }
242 if (process(lookup_unknown_object(sha1))) {
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243 if (lock)
244 unlock_ref(lock);
1e8be59d 245 return -1;
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SP
246 }
247 if (loop()) {
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JH
248 if (lock)
249 unlock_ref(lock);
cd541a68 250 return -1;
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SP
251 }
252
cd541a68 253 if (write_ref) {
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SP
254 if (write_ref_log_details) {
255 msg = xmalloc(strlen(write_ref_log_details) + 12);
256 sprintf(msg, "fetch from %s", write_ref_log_details);
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257 }
258 else
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SP
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}