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Commit | Line | Data |
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623b80be | 1 | #include "git-compat-util.h" |
36bf1958 | 2 | #include "alloc.h" |
e941c48d | 3 | #include "dir.h" |
32a8f510 | 4 | #include "environment.h" |
41771fa4 | 5 | #include "hex.h" |
a80d72db | 6 | #include "repository.h" |
8f3f9b09 JH |
7 | #include "refs.h" |
8 | #include "object.h" | |
9 | #include "commit.h" | |
b614e3d7 | 10 | #include "tag.h" |
0abe14f6 | 11 | #include "packfile.h" |
87bed179 | 12 | #include "object-file.h" |
a80d72db | 13 | #include "object-store.h" |
623b80be | 14 | #include "server-info.h" |
f4f476b6 | 15 | #include "strbuf.h" |
d5ebb50d | 16 | #include "wrapper.h" |
f4f476b6 EW |
17 | |
18 | struct update_info_ctx { | |
19 | FILE *cur_fp; | |
20 | FILE *old_fp; /* becomes NULL if it differs from cur_fp */ | |
21 | struct strbuf cur_sb; | |
22 | struct strbuf old_sb; | |
23 | }; | |
24 | ||
25 | static void uic_mark_stale(struct update_info_ctx *uic) | |
26 | { | |
27 | fclose(uic->old_fp); | |
28 | uic->old_fp = NULL; | |
29 | } | |
30 | ||
31 | static int uic_is_stale(const struct update_info_ctx *uic) | |
32 | { | |
33 | return uic->old_fp == NULL; | |
34 | } | |
35 | ||
48ca53ca | 36 | __attribute__((format (printf, 2, 3))) |
f4f476b6 EW |
37 | static int uic_printf(struct update_info_ctx *uic, const char *fmt, ...) |
38 | { | |
39 | va_list ap; | |
40 | int ret = -1; | |
41 | ||
42 | va_start(ap, fmt); | |
43 | ||
44 | if (uic_is_stale(uic)) { | |
45 | ret = vfprintf(uic->cur_fp, fmt, ap); | |
46 | } else { | |
47 | ssize_t r; | |
48 | struct strbuf *cur = &uic->cur_sb; | |
49 | struct strbuf *old = &uic->old_sb; | |
50 | ||
51 | strbuf_reset(cur); | |
52 | strbuf_vinsertf(cur, 0, fmt, ap); | |
53 | ||
54 | strbuf_reset(old); | |
55 | strbuf_grow(old, cur->len); | |
56 | r = fread(old->buf, 1, cur->len, uic->old_fp); | |
57 | if (r != cur->len || memcmp(old->buf, cur->buf, r)) | |
58 | uic_mark_stale(uic); | |
59 | ||
60 | if (fwrite(cur->buf, 1, cur->len, uic->cur_fp) == cur->len) | |
61 | ret = 0; | |
62 | } | |
63 | ||
64 | va_end(ap); | |
65 | ||
66 | return ret; | |
67 | } | |
8f3f9b09 | 68 | |
d38379ec JK |
69 | /* |
70 | * Create the file "path" by writing to a temporary file and renaming | |
71 | * it into place. The contents of the file come from "generate", which | |
72 | * should return non-zero if it encounters an error. | |
73 | */ | |
f4f476b6 EW |
74 | static int update_info_file(char *path, |
75 | int (*generate)(struct update_info_ctx *), | |
76 | int force) | |
d38379ec JK |
77 | { |
78 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
79 | int ret = -1; | |
80 | int fd = -1; | |
f4f476b6 EW |
81 | FILE *to_close; |
82 | struct update_info_ctx uic = { | |
83 | .cur_fp = NULL, | |
84 | .old_fp = NULL, | |
85 | .cur_sb = STRBUF_INIT, | |
86 | .old_sb = STRBUF_INIT | |
87 | }; | |
d38379ec JK |
88 | |
89 | safe_create_leading_directories(path); | |
d91175b2 | 90 | fd = git_mkstemp_mode(tmp, 0666); |
d38379ec JK |
91 | if (fd < 0) |
92 | goto out; | |
f4f476b6 EW |
93 | to_close = uic.cur_fp = fdopen(fd, "w"); |
94 | if (!uic.cur_fp) | |
d38379ec | 95 | goto out; |
fa1912c8 | 96 | fd = -1; |
f4f476b6 EW |
97 | |
98 | /* no problem on ENOENT and old_fp == NULL, it's stale, now */ | |
99 | if (!force) | |
100 | uic.old_fp = fopen_or_warn(path, "r"); | |
101 | ||
102 | /* | |
15beaaa3 | 103 | * uic_printf will compare incremental comparison against old_fp |
f4f476b6 EW |
104 | * and mark uic as stale if needed |
105 | */ | |
106 | ret = generate(&uic); | |
d38379ec JK |
107 | if (ret) |
108 | goto out; | |
f4f476b6 EW |
109 | |
110 | /* new file may be shorter than the old one, check here */ | |
111 | if (!uic_is_stale(&uic)) { | |
112 | struct stat st; | |
113 | long new_len = ftell(uic.cur_fp); | |
114 | int old_fd = fileno(uic.old_fp); | |
115 | ||
116 | if (new_len < 0) { | |
117 | ret = -1; | |
118 | goto out; | |
119 | } | |
120 | if (fstat(old_fd, &st) || (st.st_size != (size_t)new_len)) | |
121 | uic_mark_stale(&uic); | |
122 | } | |
123 | ||
124 | uic.cur_fp = NULL; | |
fa1912c8 | 125 | if (fclose(to_close)) |
d38379ec | 126 | goto out; |
f4f476b6 EW |
127 | |
128 | if (uic_is_stale(&uic)) { | |
129 | if (adjust_shared_perm(tmp) < 0) | |
130 | goto out; | |
131 | if (rename(tmp, path) < 0) | |
132 | goto out; | |
133 | } else { | |
134 | unlink(tmp); | |
135 | } | |
d38379ec JK |
136 | ret = 0; |
137 | ||
138 | out: | |
139 | if (ret) { | |
02382f51 | 140 | error_errno("unable to update %s", path); |
f4f476b6 EW |
141 | if (uic.cur_fp) |
142 | fclose(uic.cur_fp); | |
d38379ec JK |
143 | else if (fd >= 0) |
144 | close(fd); | |
145 | unlink(tmp); | |
146 | } | |
147 | free(tmp); | |
f4f476b6 EW |
148 | if (uic.old_fp) |
149 | fclose(uic.old_fp); | |
150 | strbuf_release(&uic.old_sb); | |
151 | strbuf_release(&uic.cur_sb); | |
d38379ec JK |
152 | return ret; |
153 | } | |
8f3f9b09 | 154 | |
e2b0bcdf | 155 | static int add_info_ref(const char *path, const struct object_id *oid, |
5cf88fd8 | 156 | int flag UNUSED, |
63e14ee2 | 157 | void *cb_data) |
8f3f9b09 | 158 | { |
f4f476b6 | 159 | struct update_info_ctx *uic = cb_data; |
109cd76d | 160 | struct object *o = parse_object(the_repository, oid); |
76f8a302 SP |
161 | if (!o) |
162 | return -1; | |
f6b42a81 | 163 | |
f4f476b6 | 164 | if (uic_printf(uic, "%s %s\n", oid_to_hex(oid), path) < 0) |
d38379ec JK |
165 | return -1; |
166 | ||
1974632c | 167 | if (o->type == OBJ_TAG) { |
a74093da | 168 | o = deref_tag(the_repository, o, path, 0); |
9534f40b | 169 | if (o) |
f4f476b6 | 170 | if (uic_printf(uic, "%s %s^{}\n", |
f2fd0760 | 171 | oid_to_hex(&o->oid), path) < 0) |
d38379ec | 172 | return -1; |
f6b42a81 | 173 | } |
8f3f9b09 JH |
174 | return 0; |
175 | } | |
176 | ||
f4f476b6 | 177 | static int generate_info_refs(struct update_info_ctx *uic) |
d38379ec | 178 | { |
f4f476b6 | 179 | return for_each_ref(add_info_ref, uic); |
d38379ec JK |
180 | } |
181 | ||
f4f476b6 | 182 | static int update_info_refs(int force) |
8f3f9b09 | 183 | { |
d38379ec | 184 | char *path = git_pathdup("info/refs"); |
f4f476b6 | 185 | int ret = update_info_file(path, generate_info_refs, force); |
d38379ec JK |
186 | free(path); |
187 | return ret; | |
8f3f9b09 JH |
188 | } |
189 | ||
190 | /* packs */ | |
4d8fa916 | 191 | static struct pack_info { |
8f3f9b09 JH |
192 | struct packed_git *p; |
193 | int old_num; | |
194 | int new_num; | |
8f3f9b09 JH |
195 | } **info; |
196 | static int num_pack; | |
8f3f9b09 | 197 | |
8f3f9b09 JH |
198 | static struct pack_info *find_pack_by_name(const char *name) |
199 | { | |
200 | int i; | |
201 | for (i = 0; i < num_pack; i++) { | |
202 | struct packed_git *p = info[i]->p; | |
b9fb142e | 203 | if (!strcmp(pack_basename(p), name)) |
8f3f9b09 JH |
204 | return info[i]; |
205 | } | |
206 | return NULL; | |
207 | } | |
208 | ||
8f3f9b09 JH |
209 | /* Returns non-zero when we detect that the info in the |
210 | * old file is useless. | |
211 | */ | |
b83a3089 | 212 | static int parse_pack_def(const char *packname, int old_cnt) |
8f3f9b09 | 213 | { |
b83a3089 | 214 | struct pack_info *i = find_pack_by_name(packname); |
8f3f9b09 JH |
215 | if (i) { |
216 | i->old_num = old_cnt; | |
217 | return 0; | |
218 | } | |
219 | else { | |
6f42f89c | 220 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
221 | return 1; |
222 | } | |
223 | } | |
224 | ||
8f3f9b09 JH |
225 | /* Returns non-zero when we detect that the info in the |
226 | * old file is useless. | |
227 | */ | |
228 | static int read_pack_info_file(const char *infofile) | |
229 | { | |
230 | FILE *fp; | |
4ecbd649 | 231 | struct strbuf line = STRBUF_INIT; |
8f3f9b09 | 232 | int old_cnt = 0; |
965cc517 | 233 | int stale = 1; |
8f3f9b09 | 234 | |
e9d983f1 | 235 | fp = fopen_or_warn(infofile, "r"); |
8f3f9b09 | 236 | if (!fp) |
addf88e4 | 237 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 | 238 | |
4ecbd649 | 239 | while (strbuf_getline(&line, fp) != EOF) { |
b83a3089 | 240 | const char *arg; |
8ac4838a | 241 | |
4ecbd649 | 242 | if (!line.len) |
8ac4838a | 243 | continue; |
8f3f9b09 | 244 | |
4ecbd649 | 245 | if (skip_prefix(line.buf, "P ", &arg)) { |
b83a3089 JK |
246 | /* P name */ |
247 | if (parse_pack_def(arg, old_cnt++)) | |
8f3f9b09 | 248 | goto out_stale; |
4ecbd649 | 249 | } else if (line.buf[0] == 'D') { |
b83a3089 | 250 | /* we used to emit D but that was misguided. */ |
3e15c67c | 251 | goto out_stale; |
4ecbd649 | 252 | } else if (line.buf[0] == 'T') { |
b83a3089 JK |
253 | /* we used to emit T but nobody uses it. */ |
254 | goto out_stale; | |
255 | } else { | |
4ecbd649 | 256 | error("unrecognized: %s", line.buf); |
8f3f9b09 JH |
257 | } |
258 | } | |
965cc517 JK |
259 | stale = 0; |
260 | ||
8f3f9b09 | 261 | out_stale: |
4ecbd649 | 262 | strbuf_release(&line); |
8f3f9b09 | 263 | fclose(fp); |
965cc517 | 264 | return stale; |
8f3f9b09 JH |
265 | } |
266 | ||
8f3f9b09 JH |
267 | static int compare_info(const void *a_, const void *b_) |
268 | { | |
4b25d091 FC |
269 | struct pack_info *const *a = a_; |
270 | struct pack_info *const *b = b_; | |
8f3f9b09 JH |
271 | |
272 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
273 | /* Keep the order in the original */ | |
274 | return (*a)->old_num - (*b)->old_num; | |
275 | else if (0 <= (*a)->old_num) | |
276 | /* Only A existed in the original so B is obviously newer */ | |
277 | return -1; | |
278 | else if (0 <= (*b)->old_num) | |
279 | /* The other way around. */ | |
280 | return 1; | |
281 | ||
d5eac498 | 282 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
283 | if ((*a)->p == (*b)->p) |
284 | return 0; | |
285 | else if ((*a)->p < (*b)->p) | |
286 | return -1; | |
287 | else | |
288 | return 1; | |
8f3f9b09 JH |
289 | } |
290 | ||
291 | static void init_pack_info(const char *infofile, int force) | |
292 | { | |
293 | struct packed_git *p; | |
294 | int stale; | |
e941c48d EW |
295 | int i; |
296 | size_t alloc = 0; | |
8f3f9b09 | 297 | |
454ea2e4 | 298 | for (p = get_all_packs(the_repository); p; p = p->next) { |
8f3f9b09 JH |
299 | /* we ignore things on alternate path since they are |
300 | * not available to the pullers in general. | |
301 | */ | |
e941c48d | 302 | if (!p->pack_local || !file_exists(p->pack_name)) |
8f3f9b09 | 303 | continue; |
e941c48d EW |
304 | |
305 | i = num_pack++; | |
306 | ALLOC_GROW(info, num_pack, alloc); | |
ca56dadb | 307 | CALLOC_ARRAY(info[i], 1); |
8f3f9b09 JH |
308 | info[i]->p = p; |
309 | info[i]->old_num = -1; | |
8f3f9b09 JH |
310 | } |
311 | ||
312 | if (infofile && !force) | |
313 | stale = read_pack_info_file(infofile); | |
314 | else | |
315 | stale = 1; | |
316 | ||
910710bb | 317 | for (i = 0; i < num_pack; i++) |
318 | if (stale) | |
8f3f9b09 | 319 | info[i]->old_num = -1; |
8f3f9b09 | 320 | |
6f42f89c | 321 | /* renumber them */ |
9ed0d8d6 | 322 | QSORT(info, num_pack, compare_info); |
8f3f9b09 JH |
323 | for (i = 0; i < num_pack; i++) |
324 | info[i]->new_num = i; | |
8f3f9b09 JH |
325 | } |
326 | ||
3907a407 JK |
327 | static void free_pack_info(void) |
328 | { | |
329 | int i; | |
330 | for (i = 0; i < num_pack; i++) | |
331 | free(info[i]); | |
332 | free(info); | |
333 | } | |
334 | ||
f4f476b6 | 335 | static int write_pack_info_file(struct update_info_ctx *uic) |
8f3f9b09 | 336 | { |
3e15c67c | 337 | int i; |
d38379ec | 338 | for (i = 0; i < num_pack; i++) { |
f4f476b6 | 339 | if (uic_printf(uic, "P %s\n", pack_basename(info[i]->p)) < 0) |
d38379ec JK |
340 | return -1; |
341 | } | |
f4f476b6 | 342 | if (uic_printf(uic, "\n") < 0) |
d38379ec JK |
343 | return -1; |
344 | return 0; | |
8f3f9b09 JH |
345 | } |
346 | ||
347 | static int update_info_packs(int force) | |
348 | { | |
d38379ec JK |
349 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); |
350 | int ret; | |
8f3f9b09 JH |
351 | |
352 | init_pack_info(infofile, force); | |
f4f476b6 | 353 | ret = update_info_file(infofile, write_pack_info_file, force); |
3907a407 | 354 | free_pack_info(); |
d38379ec JK |
355 | free(infofile); |
356 | return ret; | |
8f3f9b09 JH |
357 | } |
358 | ||
8f3f9b09 JH |
359 | /* public */ |
360 | int update_server_info(int force) | |
361 | { | |
362 | /* We would add more dumb-server support files later, | |
363 | * including index of available pack files and their | |
364 | * intended audiences. | |
365 | */ | |
366 | int errs = 0; | |
367 | ||
f4f476b6 | 368 | errs = errs | update_info_refs(force); |
8f3f9b09 | 369 | errs = errs | update_info_packs(force); |
8f3f9b09 | 370 | |
6f42f89c | 371 | /* remove leftover rev-cache file if there is any */ |
691f1a28 | 372 | unlink_or_warn(git_path("info/rev-cache")); |
6f42f89c | 373 | |
8f3f9b09 JH |
374 | return errs; |
375 | } |