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Commit | Line | Data |
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8f3f9b09 | 1 | #include "cache.h" |
a80d72db | 2 | #include "repository.h" |
8f3f9b09 JH |
3 | #include "refs.h" |
4 | #include "object.h" | |
5 | #include "commit.h" | |
b614e3d7 | 6 | #include "tag.h" |
0abe14f6 | 7 | #include "packfile.h" |
a80d72db | 8 | #include "object-store.h" |
f4f476b6 EW |
9 | #include "strbuf.h" |
10 | ||
11 | struct update_info_ctx { | |
12 | FILE *cur_fp; | |
13 | FILE *old_fp; /* becomes NULL if it differs from cur_fp */ | |
14 | struct strbuf cur_sb; | |
15 | struct strbuf old_sb; | |
16 | }; | |
17 | ||
18 | static void uic_mark_stale(struct update_info_ctx *uic) | |
19 | { | |
20 | fclose(uic->old_fp); | |
21 | uic->old_fp = NULL; | |
22 | } | |
23 | ||
24 | static int uic_is_stale(const struct update_info_ctx *uic) | |
25 | { | |
26 | return uic->old_fp == NULL; | |
27 | } | |
28 | ||
29 | static int uic_printf(struct update_info_ctx *uic, const char *fmt, ...) | |
30 | { | |
31 | va_list ap; | |
32 | int ret = -1; | |
33 | ||
34 | va_start(ap, fmt); | |
35 | ||
36 | if (uic_is_stale(uic)) { | |
37 | ret = vfprintf(uic->cur_fp, fmt, ap); | |
38 | } else { | |
39 | ssize_t r; | |
40 | struct strbuf *cur = &uic->cur_sb; | |
41 | struct strbuf *old = &uic->old_sb; | |
42 | ||
43 | strbuf_reset(cur); | |
44 | strbuf_vinsertf(cur, 0, fmt, ap); | |
45 | ||
46 | strbuf_reset(old); | |
47 | strbuf_grow(old, cur->len); | |
48 | r = fread(old->buf, 1, cur->len, uic->old_fp); | |
49 | if (r != cur->len || memcmp(old->buf, cur->buf, r)) | |
50 | uic_mark_stale(uic); | |
51 | ||
52 | if (fwrite(cur->buf, 1, cur->len, uic->cur_fp) == cur->len) | |
53 | ret = 0; | |
54 | } | |
55 | ||
56 | va_end(ap); | |
57 | ||
58 | return ret; | |
59 | } | |
8f3f9b09 | 60 | |
d38379ec JK |
61 | /* |
62 | * Create the file "path" by writing to a temporary file and renaming | |
63 | * it into place. The contents of the file come from "generate", which | |
64 | * should return non-zero if it encounters an error. | |
65 | */ | |
f4f476b6 EW |
66 | static int update_info_file(char *path, |
67 | int (*generate)(struct update_info_ctx *), | |
68 | int force) | |
d38379ec JK |
69 | { |
70 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
71 | int ret = -1; | |
72 | int fd = -1; | |
f4f476b6 EW |
73 | FILE *to_close; |
74 | struct update_info_ctx uic = { | |
75 | .cur_fp = NULL, | |
76 | .old_fp = NULL, | |
77 | .cur_sb = STRBUF_INIT, | |
78 | .old_sb = STRBUF_INIT | |
79 | }; | |
d38379ec JK |
80 | |
81 | safe_create_leading_directories(path); | |
d91175b2 | 82 | fd = git_mkstemp_mode(tmp, 0666); |
d38379ec JK |
83 | if (fd < 0) |
84 | goto out; | |
f4f476b6 EW |
85 | to_close = uic.cur_fp = fdopen(fd, "w"); |
86 | if (!uic.cur_fp) | |
d38379ec | 87 | goto out; |
fa1912c8 | 88 | fd = -1; |
f4f476b6 EW |
89 | |
90 | /* no problem on ENOENT and old_fp == NULL, it's stale, now */ | |
91 | if (!force) | |
92 | uic.old_fp = fopen_or_warn(path, "r"); | |
93 | ||
94 | /* | |
95 | * uic_printf will compare incremental comparison aginst old_fp | |
96 | * and mark uic as stale if needed | |
97 | */ | |
98 | ret = generate(&uic); | |
d38379ec JK |
99 | if (ret) |
100 | goto out; | |
f4f476b6 EW |
101 | |
102 | /* new file may be shorter than the old one, check here */ | |
103 | if (!uic_is_stale(&uic)) { | |
104 | struct stat st; | |
105 | long new_len = ftell(uic.cur_fp); | |
106 | int old_fd = fileno(uic.old_fp); | |
107 | ||
108 | if (new_len < 0) { | |
109 | ret = -1; | |
110 | goto out; | |
111 | } | |
112 | if (fstat(old_fd, &st) || (st.st_size != (size_t)new_len)) | |
113 | uic_mark_stale(&uic); | |
114 | } | |
115 | ||
116 | uic.cur_fp = NULL; | |
fa1912c8 | 117 | if (fclose(to_close)) |
d38379ec | 118 | goto out; |
f4f476b6 EW |
119 | |
120 | if (uic_is_stale(&uic)) { | |
121 | if (adjust_shared_perm(tmp) < 0) | |
122 | goto out; | |
123 | if (rename(tmp, path) < 0) | |
124 | goto out; | |
125 | } else { | |
126 | unlink(tmp); | |
127 | } | |
d38379ec JK |
128 | ret = 0; |
129 | ||
130 | out: | |
131 | if (ret) { | |
02382f51 | 132 | error_errno("unable to update %s", path); |
f4f476b6 EW |
133 | if (uic.cur_fp) |
134 | fclose(uic.cur_fp); | |
d38379ec JK |
135 | else if (fd >= 0) |
136 | close(fd); | |
137 | unlink(tmp); | |
138 | } | |
139 | free(tmp); | |
f4f476b6 EW |
140 | if (uic.old_fp) |
141 | fclose(uic.old_fp); | |
142 | strbuf_release(&uic.old_sb); | |
143 | strbuf_release(&uic.cur_sb); | |
d38379ec JK |
144 | return ret; |
145 | } | |
8f3f9b09 | 146 | |
e2b0bcdf MH |
147 | static int add_info_ref(const char *path, const struct object_id *oid, |
148 | int flag, void *cb_data) | |
8f3f9b09 | 149 | { |
f4f476b6 | 150 | struct update_info_ctx *uic = cb_data; |
109cd76d | 151 | struct object *o = parse_object(the_repository, oid); |
76f8a302 SP |
152 | if (!o) |
153 | return -1; | |
f6b42a81 | 154 | |
f4f476b6 | 155 | if (uic_printf(uic, "%s %s\n", oid_to_hex(oid), path) < 0) |
d38379ec JK |
156 | return -1; |
157 | ||
1974632c | 158 | if (o->type == OBJ_TAG) { |
a74093da | 159 | o = deref_tag(the_repository, o, path, 0); |
9534f40b | 160 | if (o) |
f4f476b6 | 161 | if (uic_printf(uic, "%s %s^{}\n", |
f2fd0760 | 162 | oid_to_hex(&o->oid), path) < 0) |
d38379ec | 163 | return -1; |
f6b42a81 | 164 | } |
8f3f9b09 JH |
165 | return 0; |
166 | } | |
167 | ||
f4f476b6 | 168 | static int generate_info_refs(struct update_info_ctx *uic) |
d38379ec | 169 | { |
f4f476b6 | 170 | return for_each_ref(add_info_ref, uic); |
d38379ec JK |
171 | } |
172 | ||
f4f476b6 | 173 | static int update_info_refs(int force) |
8f3f9b09 | 174 | { |
d38379ec | 175 | char *path = git_pathdup("info/refs"); |
f4f476b6 | 176 | int ret = update_info_file(path, generate_info_refs, force); |
d38379ec JK |
177 | free(path); |
178 | return ret; | |
8f3f9b09 JH |
179 | } |
180 | ||
181 | /* packs */ | |
4d8fa916 | 182 | static struct pack_info { |
8f3f9b09 JH |
183 | struct packed_git *p; |
184 | int old_num; | |
185 | int new_num; | |
8f3f9b09 JH |
186 | } **info; |
187 | static int num_pack; | |
8f3f9b09 | 188 | |
8f3f9b09 JH |
189 | static struct pack_info *find_pack_by_name(const char *name) |
190 | { | |
191 | int i; | |
192 | for (i = 0; i < num_pack; i++) { | |
193 | struct packed_git *p = info[i]->p; | |
b9fb142e | 194 | if (!strcmp(pack_basename(p), name)) |
8f3f9b09 JH |
195 | return info[i]; |
196 | } | |
197 | return NULL; | |
198 | } | |
199 | ||
8f3f9b09 JH |
200 | /* Returns non-zero when we detect that the info in the |
201 | * old file is useless. | |
202 | */ | |
b83a3089 | 203 | static int parse_pack_def(const char *packname, int old_cnt) |
8f3f9b09 | 204 | { |
b83a3089 | 205 | struct pack_info *i = find_pack_by_name(packname); |
8f3f9b09 JH |
206 | if (i) { |
207 | i->old_num = old_cnt; | |
208 | return 0; | |
209 | } | |
210 | else { | |
6f42f89c | 211 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
212 | return 1; |
213 | } | |
214 | } | |
215 | ||
8f3f9b09 JH |
216 | /* Returns non-zero when we detect that the info in the |
217 | * old file is useless. | |
218 | */ | |
219 | static int read_pack_info_file(const char *infofile) | |
220 | { | |
221 | FILE *fp; | |
4ecbd649 | 222 | struct strbuf line = STRBUF_INIT; |
8f3f9b09 | 223 | int old_cnt = 0; |
965cc517 | 224 | int stale = 1; |
8f3f9b09 | 225 | |
e9d983f1 | 226 | fp = fopen_or_warn(infofile, "r"); |
8f3f9b09 | 227 | if (!fp) |
addf88e4 | 228 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 | 229 | |
4ecbd649 | 230 | while (strbuf_getline(&line, fp) != EOF) { |
b83a3089 | 231 | const char *arg; |
8ac4838a | 232 | |
4ecbd649 | 233 | if (!line.len) |
8ac4838a | 234 | continue; |
8f3f9b09 | 235 | |
4ecbd649 | 236 | if (skip_prefix(line.buf, "P ", &arg)) { |
b83a3089 JK |
237 | /* P name */ |
238 | if (parse_pack_def(arg, old_cnt++)) | |
8f3f9b09 | 239 | goto out_stale; |
4ecbd649 | 240 | } else if (line.buf[0] == 'D') { |
b83a3089 | 241 | /* we used to emit D but that was misguided. */ |
3e15c67c | 242 | goto out_stale; |
4ecbd649 | 243 | } else if (line.buf[0] == 'T') { |
b83a3089 JK |
244 | /* we used to emit T but nobody uses it. */ |
245 | goto out_stale; | |
246 | } else { | |
4ecbd649 | 247 | error("unrecognized: %s", line.buf); |
8f3f9b09 JH |
248 | } |
249 | } | |
965cc517 JK |
250 | stale = 0; |
251 | ||
8f3f9b09 | 252 | out_stale: |
4ecbd649 | 253 | strbuf_release(&line); |
8f3f9b09 | 254 | fclose(fp); |
965cc517 | 255 | return stale; |
8f3f9b09 JH |
256 | } |
257 | ||
8f3f9b09 JH |
258 | static int compare_info(const void *a_, const void *b_) |
259 | { | |
4b25d091 FC |
260 | struct pack_info *const *a = a_; |
261 | struct pack_info *const *b = b_; | |
8f3f9b09 JH |
262 | |
263 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
264 | /* Keep the order in the original */ | |
265 | return (*a)->old_num - (*b)->old_num; | |
266 | else if (0 <= (*a)->old_num) | |
267 | /* Only A existed in the original so B is obviously newer */ | |
268 | return -1; | |
269 | else if (0 <= (*b)->old_num) | |
270 | /* The other way around. */ | |
271 | return 1; | |
272 | ||
d5eac498 | 273 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
274 | if ((*a)->p == (*b)->p) |
275 | return 0; | |
276 | else if ((*a)->p < (*b)->p) | |
277 | return -1; | |
278 | else | |
279 | return 1; | |
8f3f9b09 JH |
280 | } |
281 | ||
282 | static void init_pack_info(const char *infofile, int force) | |
283 | { | |
284 | struct packed_git *p; | |
285 | int stale; | |
286 | int i = 0; | |
8f3f9b09 | 287 | |
454ea2e4 | 288 | for (p = get_all_packs(the_repository); p; p = p->next) { |
8f3f9b09 JH |
289 | /* we ignore things on alternate path since they are |
290 | * not available to the pullers in general. | |
291 | */ | |
f13d7db4 | 292 | if (!p->pack_local) |
8f3f9b09 JH |
293 | continue; |
294 | i++; | |
295 | } | |
296 | num_pack = i; | |
297 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
454ea2e4 | 298 | for (i = 0, p = get_all_packs(the_repository); p; p = p->next) { |
f13d7db4 | 299 | if (!p->pack_local) |
8f3f9b09 | 300 | continue; |
79bb8b3c | 301 | assert(i < num_pack); |
6f42f89c | 302 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
303 | info[i]->p = p; |
304 | info[i]->old_num = -1; | |
305 | i++; | |
306 | } | |
307 | ||
308 | if (infofile && !force) | |
309 | stale = read_pack_info_file(infofile); | |
310 | else | |
311 | stale = 1; | |
312 | ||
910710bb | 313 | for (i = 0; i < num_pack; i++) |
314 | if (stale) | |
8f3f9b09 | 315 | info[i]->old_num = -1; |
8f3f9b09 | 316 | |
6f42f89c | 317 | /* renumber them */ |
9ed0d8d6 | 318 | QSORT(info, num_pack, compare_info); |
8f3f9b09 JH |
319 | for (i = 0; i < num_pack; i++) |
320 | info[i]->new_num = i; | |
8f3f9b09 JH |
321 | } |
322 | ||
3907a407 JK |
323 | static void free_pack_info(void) |
324 | { | |
325 | int i; | |
326 | for (i = 0; i < num_pack; i++) | |
327 | free(info[i]); | |
328 | free(info); | |
329 | } | |
330 | ||
f4f476b6 | 331 | static int write_pack_info_file(struct update_info_ctx *uic) |
8f3f9b09 | 332 | { |
3e15c67c | 333 | int i; |
d38379ec | 334 | for (i = 0; i < num_pack; i++) { |
f4f476b6 | 335 | if (uic_printf(uic, "P %s\n", pack_basename(info[i]->p)) < 0) |
d38379ec JK |
336 | return -1; |
337 | } | |
f4f476b6 | 338 | if (uic_printf(uic, "\n") < 0) |
d38379ec JK |
339 | return -1; |
340 | return 0; | |
8f3f9b09 JH |
341 | } |
342 | ||
343 | static int update_info_packs(int force) | |
344 | { | |
d38379ec JK |
345 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); |
346 | int ret; | |
8f3f9b09 JH |
347 | |
348 | init_pack_info(infofile, force); | |
f4f476b6 | 349 | ret = update_info_file(infofile, write_pack_info_file, force); |
3907a407 | 350 | free_pack_info(); |
d38379ec JK |
351 | free(infofile); |
352 | return ret; | |
8f3f9b09 JH |
353 | } |
354 | ||
8f3f9b09 JH |
355 | /* public */ |
356 | int update_server_info(int force) | |
357 | { | |
358 | /* We would add more dumb-server support files later, | |
359 | * including index of available pack files and their | |
360 | * intended audiences. | |
361 | */ | |
362 | int errs = 0; | |
363 | ||
f4f476b6 | 364 | errs = errs | update_info_refs(force); |
8f3f9b09 | 365 | errs = errs | update_info_packs(force); |
8f3f9b09 | 366 | |
6f42f89c | 367 | /* remove leftover rev-cache file if there is any */ |
691f1a28 | 368 | unlink_or_warn(git_path("info/rev-cache")); |
6f42f89c | 369 | |
8f3f9b09 JH |
370 | return errs; |
371 | } |