]>
Commit | Line | Data |
---|---|---|
8f3f9b09 JH |
1 | #include "cache.h" |
2 | #include "refs.h" | |
3 | #include "object.h" | |
4 | #include "commit.h" | |
b614e3d7 | 5 | #include "tag.h" |
8f3f9b09 | 6 | |
d38379ec JK |
7 | /* |
8 | * Create the file "path" by writing to a temporary file and renaming | |
9 | * it into place. The contents of the file come from "generate", which | |
10 | * should return non-zero if it encounters an error. | |
11 | */ | |
12 | static int update_info_file(char *path, int (*generate)(FILE *)) | |
13 | { | |
14 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
15 | int ret = -1; | |
16 | int fd = -1; | |
17 | FILE *fp = NULL; | |
18 | ||
19 | safe_create_leading_directories(path); | |
d91175b2 | 20 | fd = git_mkstemp_mode(tmp, 0666); |
d38379ec JK |
21 | if (fd < 0) |
22 | goto out; | |
23 | fp = fdopen(fd, "w"); | |
24 | if (!fp) | |
25 | goto out; | |
26 | ret = generate(fp); | |
27 | if (ret) | |
28 | goto out; | |
29 | if (fclose(fp)) | |
30 | goto out; | |
31 | if (adjust_shared_perm(tmp) < 0) | |
32 | goto out; | |
33 | if (rename(tmp, path) < 0) | |
34 | goto out; | |
35 | ret = 0; | |
36 | ||
37 | out: | |
38 | if (ret) { | |
39 | error("unable to update %s: %s", path, strerror(errno)); | |
40 | if (fp) | |
41 | fclose(fp); | |
42 | else if (fd >= 0) | |
43 | close(fd); | |
44 | unlink(tmp); | |
45 | } | |
46 | free(tmp); | |
47 | return ret; | |
48 | } | |
8f3f9b09 | 49 | |
e2b0bcdf MH |
50 | static int add_info_ref(const char *path, const struct object_id *oid, |
51 | int flag, void *cb_data) | |
8f3f9b09 | 52 | { |
d38379ec | 53 | FILE *fp = cb_data; |
e2b0bcdf | 54 | struct object *o = parse_object(oid->hash); |
76f8a302 SP |
55 | if (!o) |
56 | return -1; | |
f6b42a81 | 57 | |
e2b0bcdf | 58 | if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0) |
d38379ec JK |
59 | return -1; |
60 | ||
1974632c | 61 | if (o->type == OBJ_TAG) { |
9534f40b JH |
62 | o = deref_tag(o, path, 0); |
63 | if (o) | |
d38379ec | 64 | if (fprintf(fp, "%s %s^{}\n", |
f2fd0760 | 65 | oid_to_hex(&o->oid), path) < 0) |
d38379ec | 66 | return -1; |
f6b42a81 | 67 | } |
8f3f9b09 JH |
68 | return 0; |
69 | } | |
70 | ||
d38379ec JK |
71 | static int generate_info_refs(FILE *fp) |
72 | { | |
e2b0bcdf | 73 | return for_each_ref(add_info_ref, fp); |
d38379ec JK |
74 | } |
75 | ||
8f3f9b09 JH |
76 | static int update_info_refs(int force) |
77 | { | |
d38379ec JK |
78 | char *path = git_pathdup("info/refs"); |
79 | int ret = update_info_file(path, generate_info_refs); | |
80 | free(path); | |
81 | return ret; | |
8f3f9b09 JH |
82 | } |
83 | ||
84 | /* packs */ | |
4d8fa916 | 85 | static struct pack_info { |
8f3f9b09 JH |
86 | struct packed_git *p; |
87 | int old_num; | |
88 | int new_num; | |
89 | int nr_alloc; | |
90 | int nr_heads; | |
91 | unsigned char (*head)[20]; | |
8f3f9b09 JH |
92 | } **info; |
93 | static int num_pack; | |
94 | static const char *objdir; | |
95 | static int objdirlen; | |
96 | ||
8f3f9b09 JH |
97 | static struct pack_info *find_pack_by_name(const char *name) |
98 | { | |
99 | int i; | |
100 | for (i = 0; i < num_pack; i++) { | |
101 | struct packed_git *p = info[i]->p; | |
102 | /* skip "/pack/" after ".git/objects" */ | |
103 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
104 | return info[i]; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
8f3f9b09 JH |
109 | /* Returns non-zero when we detect that the info in the |
110 | * old file is useless. | |
111 | */ | |
112 | static int parse_pack_def(const char *line, int old_cnt) | |
113 | { | |
114 | struct pack_info *i = find_pack_by_name(line + 2); | |
115 | if (i) { | |
116 | i->old_num = old_cnt; | |
117 | return 0; | |
118 | } | |
119 | else { | |
6f42f89c | 120 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
121 | return 1; |
122 | } | |
123 | } | |
124 | ||
8f3f9b09 JH |
125 | /* Returns non-zero when we detect that the info in the |
126 | * old file is useless. | |
127 | */ | |
128 | static int read_pack_info_file(const char *infofile) | |
129 | { | |
130 | FILE *fp; | |
131 | char line[1000]; | |
132 | int old_cnt = 0; | |
133 | ||
134 | fp = fopen(infofile, "r"); | |
135 | if (!fp) | |
addf88e4 | 136 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 JH |
137 | |
138 | while (fgets(line, sizeof(line), fp)) { | |
139 | int len = strlen(line); | |
872c930d | 140 | if (len && line[len-1] == '\n') |
8ac4838a JH |
141 | line[--len] = 0; |
142 | ||
143 | if (!len) | |
144 | continue; | |
8f3f9b09 JH |
145 | |
146 | switch (line[0]) { | |
147 | case 'P': /* P name */ | |
148 | if (parse_pack_def(line, old_cnt++)) | |
149 | goto out_stale; | |
150 | break; | |
6f42f89c | 151 | case 'D': /* we used to emit D but that was misguided. */ |
3e15c67c JH |
152 | case 'T': /* we used to emit T but nobody uses it. */ |
153 | goto out_stale; | |
8f3f9b09 JH |
154 | default: |
155 | error("unrecognized: %s", line); | |
156 | break; | |
157 | } | |
158 | } | |
159 | fclose(fp); | |
160 | return 0; | |
161 | out_stale: | |
162 | fclose(fp); | |
163 | return 1; | |
164 | } | |
165 | ||
8f3f9b09 JH |
166 | static int compare_info(const void *a_, const void *b_) |
167 | { | |
4b25d091 FC |
168 | struct pack_info *const *a = a_; |
169 | struct pack_info *const *b = b_; | |
8f3f9b09 JH |
170 | |
171 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
172 | /* Keep the order in the original */ | |
173 | return (*a)->old_num - (*b)->old_num; | |
174 | else if (0 <= (*a)->old_num) | |
175 | /* Only A existed in the original so B is obviously newer */ | |
176 | return -1; | |
177 | else if (0 <= (*b)->old_num) | |
178 | /* The other way around. */ | |
179 | return 1; | |
180 | ||
d5eac498 | 181 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
182 | if ((*a)->p == (*b)->p) |
183 | return 0; | |
184 | else if ((*a)->p < (*b)->p) | |
185 | return -1; | |
186 | else | |
187 | return 1; | |
8f3f9b09 JH |
188 | } |
189 | ||
190 | static void init_pack_info(const char *infofile, int force) | |
191 | { | |
192 | struct packed_git *p; | |
193 | int stale; | |
194 | int i = 0; | |
8f3f9b09 JH |
195 | |
196 | objdir = get_object_directory(); | |
197 | objdirlen = strlen(objdir); | |
198 | ||
199 | prepare_packed_git(); | |
200 | for (p = packed_git; p; p = p->next) { | |
201 | /* we ignore things on alternate path since they are | |
202 | * not available to the pullers in general. | |
203 | */ | |
f13d7db4 | 204 | if (!p->pack_local) |
8f3f9b09 JH |
205 | continue; |
206 | i++; | |
207 | } | |
208 | num_pack = i; | |
209 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
210 | for (i = 0, p = packed_git; p; p = p->next) { | |
f13d7db4 | 211 | if (!p->pack_local) |
8f3f9b09 | 212 | continue; |
6f42f89c | 213 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
214 | info[i]->p = p; |
215 | info[i]->old_num = -1; | |
216 | i++; | |
217 | } | |
218 | ||
219 | if (infofile && !force) | |
220 | stale = read_pack_info_file(infofile); | |
221 | else | |
222 | stale = 1; | |
223 | ||
224 | for (i = 0; i < num_pack; i++) { | |
225 | if (stale) { | |
226 | info[i]->old_num = -1; | |
8f3f9b09 JH |
227 | info[i]->nr_heads = 0; |
228 | } | |
8f3f9b09 JH |
229 | } |
230 | ||
6f42f89c | 231 | /* renumber them */ |
8f3f9b09 JH |
232 | qsort(info, num_pack, sizeof(info[0]), compare_info); |
233 | for (i = 0; i < num_pack; i++) | |
234 | info[i]->new_num = i; | |
8f3f9b09 JH |
235 | } |
236 | ||
3907a407 JK |
237 | static void free_pack_info(void) |
238 | { | |
239 | int i; | |
240 | for (i = 0; i < num_pack; i++) | |
241 | free(info[i]); | |
242 | free(info); | |
243 | } | |
244 | ||
d38379ec | 245 | static int write_pack_info_file(FILE *fp) |
8f3f9b09 | 246 | { |
3e15c67c | 247 | int i; |
d38379ec JK |
248 | for (i = 0; i < num_pack; i++) { |
249 | if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0) | |
250 | return -1; | |
251 | } | |
252 | if (fputc('\n', fp) == EOF) | |
253 | return -1; | |
254 | return 0; | |
8f3f9b09 JH |
255 | } |
256 | ||
257 | static int update_info_packs(int force) | |
258 | { | |
d38379ec JK |
259 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); |
260 | int ret; | |
8f3f9b09 JH |
261 | |
262 | init_pack_info(infofile, force); | |
d38379ec | 263 | ret = update_info_file(infofile, write_pack_info_file); |
3907a407 | 264 | free_pack_info(); |
d38379ec JK |
265 | free(infofile); |
266 | return ret; | |
8f3f9b09 JH |
267 | } |
268 | ||
8f3f9b09 JH |
269 | /* public */ |
270 | int update_server_info(int force) | |
271 | { | |
272 | /* We would add more dumb-server support files later, | |
273 | * including index of available pack files and their | |
274 | * intended audiences. | |
275 | */ | |
276 | int errs = 0; | |
277 | ||
278 | errs = errs | update_info_refs(force); | |
279 | errs = errs | update_info_packs(force); | |
8f3f9b09 | 280 | |
6f42f89c | 281 | /* remove leftover rev-cache file if there is any */ |
691f1a28 | 282 | unlink_or_warn(git_path("info/rev-cache")); |
6f42f89c | 283 | |
8f3f9b09 JH |
284 | return errs; |
285 | } |