Archive-destroying "git repack -a -d" bug.
[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
36static int make_sure_we_have_it(const char *what, unsigned char *sha1)
ee4f439f 37{
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38 int status = 0;
39
40 if (!has_sha1_file(sha1)) {
41 status = fetch(sha1);
42 if (status && what)
43 report_missing(what, sha1);
44 }
b2d62f16 45 return status;
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46}
47
1e8be59d 48static int process(unsigned char *sha1, const char *type);
3173bd49 49
1e8be59d 50static int process_tree(struct tree *tree)
4250a5e5 51{
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52 struct tree_entry_list *entries;
53
54 if (parse_tree(tree))
55 return -1;
56
57 for (entries = tree->entries; entries; entries = entries->next) {
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58 if (process(entries->item.any->sha1,
59 entries->directory ? tree_type : blob_type))
4250a5e5 60 return -1;
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61 }
62 return 0;
63}
64
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65#define COMPLETE 1U
66static struct commit_list *complete = NULL;
22c6e1d0 67
1e8be59d 68static int process_commit(struct commit *commit)
4250a5e5 69{
1e8be59d 70 if (parse_commit(commit))
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71 return -1;
72
22c6e1d0 73 while (complete && complete->item->date >= commit->date) {
d0ac30f2 74 pop_most_recent_commit(&complete, COMPLETE);
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75 }
76
77
d0ac30f2 78 if (commit->object.flags & COMPLETE)
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79 return 0;
80
1e8be59d 81 memcpy(current_commit_sha1, commit->object.sha1, 20);
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82
83 if (get_tree) {
1e8be59d 84 if (process(commit->tree->object.sha1, tree_type))
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85 return -1;
86 if (!get_all)
87 get_tree = 0;
88 }
89 if (get_history) {
1e8be59d 90 struct commit_list *parents = commit->parents;
4250a5e5 91 for (; parents; parents = parents->next) {
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92 if (process(parents->item->object.sha1,
93 commit_type))
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94 return -1;
95 }
96 }
97 return 0;
98}
99
1e8be59d 100static int process_tag(struct tag *tag)
3173bd49 101{
1e8be59d 102 if (parse_tag(tag))
3173bd49 103 return -1;
1e8be59d 104 return process(tag->tagged->sha1, NULL);
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105}
106
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107static struct object_list *process_queue = NULL;
108static struct object_list **process_queue_end = &process_queue;
109
f88fcf8b 110static int process_object(struct object *obj)
3173bd49 111{
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112 if (obj->type == commit_type) {
113 if (process_commit((struct commit *)obj))
114 return -1;
115 return 0;
116 }
117 if (obj->type == tree_type) {
118 if (process_tree((struct tree *)obj))
119 return -1;
120 return 0;
121 }
122 if (obj->type == blob_type) {
123 return 0;
124 }
125 if (obj->type == tag_type) {
126 if (process_tag((struct tag *)obj))
127 return -1;
3173bd49 128 return 0;
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129 }
130 return error("Unable to determine requirements "
131 "of type %s for %s",
132 obj->type, sha1_to_hex(obj->sha1));
133}
134
135static int process(unsigned char *sha1, const char *type)
136{
137 struct object *obj = lookup_object_type(sha1, type);
22c6e1d0 138
f88fcf8b 139 if (has_sha1_file(sha1)) {
0d62fb56 140 parse_object(sha1);
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141 /* We already have it, so we should scan it now. */
142 return process_object(obj);
143 }
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144 if (object_list_contains(process_queue, obj))
145 return 0;
146 object_list_insert(obj, process_queue_end);
147 process_queue_end = &(*process_queue_end)->next;
148
149 //fprintf(stderr, "prefetch %s\n", sha1_to_hex(sha1));
150 prefetch(sha1);
151
152 return 0;
153}
154
155static int loop(void)
156{
157 while (process_queue) {
158 struct object *obj = process_queue->item;
159 /*
160 fprintf(stderr, "%d objects to pull\n",
161 object_list_length(process_queue));
162 */
163 process_queue = process_queue->next;
164 if (!process_queue)
165 process_queue_end = &process_queue;
166
167 //fprintf(stderr, "fetch %s\n", sha1_to_hex(obj->sha1));
168
c7c81b3a 169 if (make_sure_we_have_it(obj->type ? obj->type : "object",
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170 obj->sha1))
171 return -1;
172 if (!obj->type)
173 parse_object(obj->sha1);
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174 if (process_object(obj))
175 return -1;
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176 }
177 return 0;
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178}
179
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180static int interpret_target(char *target, unsigned char *sha1)
181{
182 if (!get_sha1_hex(target, sha1))
183 return 0;
184 if (!check_ref_format(target)) {
185 if (!fetch_ref(target, sha1)) {
186 return 0;
187 }
188 }
189 return -1;
190}
191
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192static int mark_complete(const char *path, const unsigned char *sha1)
193{
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194 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
195 if (commit) {
196 commit->object.flags |= COMPLETE;
197 insert_by_date(commit, &complete);
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198 }
199 return 0;
200}
cd541a68 201
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202int pull(char *target)
203{
4250a5e5 204 unsigned char sha1[20];
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205 int fd = -1;
206
98533b90 207 save_commit_buffer = 0;
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208 if (write_ref && current_ref) {
209 fd = lock_ref_sha1(write_ref, current_ref);
210 if (fd < 0)
211 return -1;
212 }
213
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214 for_each_ref(mark_complete);
215
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216 if (interpret_target(target, sha1))
217 return error("Could not interpret %s as something to pull",
218 target);
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219 if (process(sha1, NULL))
220 return -1;
221 if (loop())
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222 return -1;
223
224 if (write_ref) {
225 if (current_ref) {
226 write_ref_sha1(write_ref, fd, sha1);
227 } else {
228 write_ref_sha1_unlocked(write_ref, sha1);
229 }
230 }
231 return 0;
4250a5e5 232}