[PATCH] Provide access to git_dir through get_git_dir().
[git/git.git] / fetch.c
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215a7ad1 1#include "fetch.h"
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2
3#include "cache.h"
4#include "commit.h"
5#include "tree.h"
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6#include "tag.h"
7#include "blob.h"
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8#include "refs.h"
9
10const char *write_ref = NULL;
11
12const unsigned char *current_ref = NULL;
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13
14int get_tree = 0;
15int get_history = 0;
16int get_all = 0;
e78d9772 17int get_verbosely = 0;
b2d62f16 18static unsigned char current_commit_sha1[20];
4250a5e5 19
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20void pull_say(const char *fmt, const char *hex)
21{
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22 if (get_verbosely)
23 fprintf(stderr, fmt, hex);
24}
25
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26static void report_missing(const char *what, const unsigned char *missing)
27{
28 char missing_hex[41];
29
30 strcpy(missing_hex, sha1_to_hex(missing));;
31 fprintf(stderr,
32 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
33 what, missing_hex, sha1_to_hex(current_commit_sha1));
34}
35
80077f07 36static int process(struct object *obj);
3173bd49 37
1e8be59d 38static int process_tree(struct tree *tree)
4250a5e5 39{
85d106c2 40 struct tree_entry_list *entry;
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41
42 if (parse_tree(tree))
43 return -1;
44
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45 entry = tree->entries;
46 tree->entries = NULL;
47 while (entry) {
48 struct tree_entry_list *next = entry->next;
80077f07 49 if (process(entry->item.any))
4250a5e5 50 return -1;
d35bbe0b 51 free(entry->name);
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52 free(entry);
53 entry = next;
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54 }
55 return 0;
56}
57
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58#define COMPLETE (1U << 0)
59#define SEEN (1U << 1)
60#define TO_SCAN (1U << 2)
85d106c2 61
d0ac30f2 62static struct commit_list *complete = NULL;
22c6e1d0 63
1e8be59d 64static int process_commit(struct commit *commit)
4250a5e5 65{
1e8be59d 66 if (parse_commit(commit))
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67 return -1;
68
22c6e1d0 69 while (complete && complete->item->date >= commit->date) {
d0ac30f2 70 pop_most_recent_commit(&complete, COMPLETE);
22c6e1d0 71 }
22c6e1d0 72
d0ac30f2 73 if (commit->object.flags & COMPLETE)
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74 return 0;
75
1e8be59d 76 memcpy(current_commit_sha1, commit->object.sha1, 20);
4250a5e5 77
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78 pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
79
4250a5e5 80 if (get_tree) {
80077f07 81 if (process(&commit->tree->object))
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82 return -1;
83 if (!get_all)
84 get_tree = 0;
85 }
86 if (get_history) {
1e8be59d 87 struct commit_list *parents = commit->parents;
4250a5e5 88 for (; parents; parents = parents->next) {
80077f07 89 if (process(&parents->item->object))
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90 return -1;
91 }
92 }
93 return 0;
94}
95
1e8be59d 96static int process_tag(struct tag *tag)
3173bd49 97{
1e8be59d 98 if (parse_tag(tag))
3173bd49 99 return -1;
80077f07 100 return process(tag->tagged);
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101}
102
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103static struct object_list *process_queue = NULL;
104static struct object_list **process_queue_end = &process_queue;
105
f88fcf8b 106static int process_object(struct object *obj)
3173bd49 107{
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108 if (obj->type == commit_type) {
109 if (process_commit((struct commit *)obj))
110 return -1;
111 return 0;
112 }
113 if (obj->type == tree_type) {
114 if (process_tree((struct tree *)obj))
115 return -1;
116 return 0;
117 }
118 if (obj->type == blob_type) {
119 return 0;
120 }
121 if (obj->type == tag_type) {
122 if (process_tag((struct tag *)obj))
123 return -1;
3173bd49 124 return 0;
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125 }
126 return error("Unable to determine requirements "
127 "of type %s for %s",
128 obj->type, sha1_to_hex(obj->sha1));
129}
130
80077f07 131static int process(struct object *obj)
f88fcf8b 132{
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133 if (obj->flags & SEEN)
134 return 0;
135 obj->flags |= SEEN;
136
80077f07 137 if (has_sha1_file(obj->sha1)) {
f88fcf8b 138 /* We already have it, so we should scan it now. */
85d106c2 139 obj->flags |= TO_SCAN;
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140 } else {
141 if (obj->flags & COMPLETE)
142 return 0;
143 prefetch(obj->sha1);
f88fcf8b 144 }
7b64d06b 145
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146 object_list_insert(obj, process_queue_end);
147 process_queue_end = &(*process_queue_end)->next;
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148 return 0;
149}
150
151static int loop(void)
152{
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153 struct object_list *elem;
154
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155 while (process_queue) {
156 struct object *obj = process_queue->item;
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157 elem = process_queue;
158 process_queue = elem->next;
159 free(elem);
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160 if (!process_queue)
161 process_queue_end = &process_queue;
162
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163 /* If we are not scanning this object, we placed it in
164 * the queue because we needed to fetch it first.
165 */
166 if (! (obj->flags & TO_SCAN)) {
029f6de3 167 if (!has_sha1_file(obj->sha1) && fetch(obj->sha1)) {
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168 report_missing(obj->type
169 ? obj->type
170 : "object", obj->sha1);
171 return -1;
172 }
173 }
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174 if (!obj->type)
175 parse_object(obj->sha1);
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176 if (process_object(obj))
177 return -1;
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178 }
179 return 0;
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180}
181
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182static int interpret_target(char *target, unsigned char *sha1)
183{
184 if (!get_sha1_hex(target, sha1))
185 return 0;
186 if (!check_ref_format(target)) {
187 if (!fetch_ref(target, sha1)) {
188 return 0;
189 }
190 }
191 return -1;
192}
193
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194static int mark_complete(const char *path, const unsigned char *sha1)
195{
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196 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
197 if (commit) {
198 commit->object.flags |= COMPLETE;
199 insert_by_date(commit, &complete);
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200 }
201 return 0;
202}
cd541a68 203
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204int pull(char *target)
205{
4250a5e5 206 unsigned char sha1[20];
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207 int fd = -1;
208
98533b90 209 save_commit_buffer = 0;
a95cb6fb 210 track_object_refs = 0;
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211 if (write_ref && current_ref) {
212 fd = lock_ref_sha1(write_ref, current_ref);
213 if (fd < 0)
214 return -1;
215 }
216
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217 for_each_ref(mark_complete);
218
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219 if (interpret_target(target, sha1))
220 return error("Could not interpret %s as something to pull",
221 target);
80077f07 222 if (process(lookup_unknown_object(sha1)))
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223 return -1;
224 if (loop())
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225 return -1;
226
227 if (write_ref) {
228 if (current_ref) {
229 write_ref_sha1(write_ref, fd, sha1);
230 } else {
231 write_ref_sha1_unlocked(write_ref, sha1);
232 }
233 }
234 return 0;
4250a5e5 235}