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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" |
8f3f9b09 | 9 | |
d38379ec JK |
10 | /* |
11 | * Create the file "path" by writing to a temporary file and renaming | |
12 | * it into place. The contents of the file come from "generate", which | |
13 | * should return non-zero if it encounters an error. | |
14 | */ | |
15 | static int update_info_file(char *path, int (*generate)(FILE *)) | |
16 | { | |
17 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
18 | int ret = -1; | |
19 | int fd = -1; | |
fa1912c8 | 20 | FILE *fp = NULL, *to_close; |
d38379ec JK |
21 | |
22 | safe_create_leading_directories(path); | |
d91175b2 | 23 | fd = git_mkstemp_mode(tmp, 0666); |
d38379ec JK |
24 | if (fd < 0) |
25 | goto out; | |
fa1912c8 | 26 | to_close = fp = fdopen(fd, "w"); |
d38379ec JK |
27 | if (!fp) |
28 | goto out; | |
fa1912c8 | 29 | fd = -1; |
d38379ec JK |
30 | ret = generate(fp); |
31 | if (ret) | |
32 | goto out; | |
fa1912c8 RS |
33 | fp = NULL; |
34 | if (fclose(to_close)) | |
d38379ec JK |
35 | goto out; |
36 | if (adjust_shared_perm(tmp) < 0) | |
37 | goto out; | |
38 | if (rename(tmp, path) < 0) | |
39 | goto out; | |
40 | ret = 0; | |
41 | ||
42 | out: | |
43 | if (ret) { | |
02382f51 | 44 | error_errno("unable to update %s", path); |
d38379ec JK |
45 | if (fp) |
46 | fclose(fp); | |
47 | else if (fd >= 0) | |
48 | close(fd); | |
49 | unlink(tmp); | |
50 | } | |
51 | free(tmp); | |
52 | return ret; | |
53 | } | |
8f3f9b09 | 54 | |
e2b0bcdf MH |
55 | static int add_info_ref(const char *path, const struct object_id *oid, |
56 | int flag, void *cb_data) | |
8f3f9b09 | 57 | { |
d38379ec | 58 | FILE *fp = cb_data; |
c251c83d | 59 | struct object *o = parse_object(oid); |
76f8a302 SP |
60 | if (!o) |
61 | return -1; | |
f6b42a81 | 62 | |
e2b0bcdf | 63 | if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0) |
d38379ec JK |
64 | return -1; |
65 | ||
1974632c | 66 | if (o->type == OBJ_TAG) { |
9534f40b JH |
67 | o = deref_tag(o, path, 0); |
68 | if (o) | |
d38379ec | 69 | if (fprintf(fp, "%s %s^{}\n", |
f2fd0760 | 70 | oid_to_hex(&o->oid), path) < 0) |
d38379ec | 71 | return -1; |
f6b42a81 | 72 | } |
8f3f9b09 JH |
73 | return 0; |
74 | } | |
75 | ||
d38379ec JK |
76 | static int generate_info_refs(FILE *fp) |
77 | { | |
e2b0bcdf | 78 | return for_each_ref(add_info_ref, fp); |
d38379ec JK |
79 | } |
80 | ||
8f3f9b09 JH |
81 | static int update_info_refs(int force) |
82 | { | |
d38379ec JK |
83 | char *path = git_pathdup("info/refs"); |
84 | int ret = update_info_file(path, generate_info_refs); | |
85 | free(path); | |
86 | return ret; | |
8f3f9b09 JH |
87 | } |
88 | ||
89 | /* packs */ | |
4d8fa916 | 90 | static struct pack_info { |
8f3f9b09 JH |
91 | struct packed_git *p; |
92 | int old_num; | |
93 | int new_num; | |
94 | int nr_alloc; | |
95 | int nr_heads; | |
96 | unsigned char (*head)[20]; | |
8f3f9b09 JH |
97 | } **info; |
98 | static int num_pack; | |
99 | static const char *objdir; | |
100 | static int objdirlen; | |
101 | ||
8f3f9b09 JH |
102 | static struct pack_info *find_pack_by_name(const char *name) |
103 | { | |
104 | int i; | |
105 | for (i = 0; i < num_pack; i++) { | |
106 | struct packed_git *p = info[i]->p; | |
107 | /* skip "/pack/" after ".git/objects" */ | |
108 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
109 | return info[i]; | |
110 | } | |
111 | return NULL; | |
112 | } | |
113 | ||
8f3f9b09 JH |
114 | /* Returns non-zero when we detect that the info in the |
115 | * old file is useless. | |
116 | */ | |
117 | static int parse_pack_def(const char *line, int old_cnt) | |
118 | { | |
119 | struct pack_info *i = find_pack_by_name(line + 2); | |
120 | if (i) { | |
121 | i->old_num = old_cnt; | |
122 | return 0; | |
123 | } | |
124 | else { | |
6f42f89c | 125 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
126 | return 1; |
127 | } | |
128 | } | |
129 | ||
8f3f9b09 JH |
130 | /* Returns non-zero when we detect that the info in the |
131 | * old file is useless. | |
132 | */ | |
133 | static int read_pack_info_file(const char *infofile) | |
134 | { | |
135 | FILE *fp; | |
136 | char line[1000]; | |
137 | int old_cnt = 0; | |
138 | ||
e9d983f1 | 139 | fp = fopen_or_warn(infofile, "r"); |
8f3f9b09 | 140 | if (!fp) |
addf88e4 | 141 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 JH |
142 | |
143 | while (fgets(line, sizeof(line), fp)) { | |
144 | int len = strlen(line); | |
872c930d | 145 | if (len && line[len-1] == '\n') |
8ac4838a JH |
146 | line[--len] = 0; |
147 | ||
148 | if (!len) | |
149 | continue; | |
8f3f9b09 JH |
150 | |
151 | switch (line[0]) { | |
152 | case 'P': /* P name */ | |
153 | if (parse_pack_def(line, old_cnt++)) | |
154 | goto out_stale; | |
155 | break; | |
6f42f89c | 156 | case 'D': /* we used to emit D but that was misguided. */ |
3e15c67c JH |
157 | case 'T': /* we used to emit T but nobody uses it. */ |
158 | goto out_stale; | |
8f3f9b09 JH |
159 | default: |
160 | error("unrecognized: %s", line); | |
161 | break; | |
162 | } | |
163 | } | |
164 | fclose(fp); | |
165 | return 0; | |
166 | out_stale: | |
167 | fclose(fp); | |
168 | return 1; | |
169 | } | |
170 | ||
8f3f9b09 JH |
171 | static int compare_info(const void *a_, const void *b_) |
172 | { | |
4b25d091 FC |
173 | struct pack_info *const *a = a_; |
174 | struct pack_info *const *b = b_; | |
8f3f9b09 JH |
175 | |
176 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
177 | /* Keep the order in the original */ | |
178 | return (*a)->old_num - (*b)->old_num; | |
179 | else if (0 <= (*a)->old_num) | |
180 | /* Only A existed in the original so B is obviously newer */ | |
181 | return -1; | |
182 | else if (0 <= (*b)->old_num) | |
183 | /* The other way around. */ | |
184 | return 1; | |
185 | ||
d5eac498 | 186 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
187 | if ((*a)->p == (*b)->p) |
188 | return 0; | |
189 | else if ((*a)->p < (*b)->p) | |
190 | return -1; | |
191 | else | |
192 | return 1; | |
8f3f9b09 JH |
193 | } |
194 | ||
195 | static void init_pack_info(const char *infofile, int force) | |
196 | { | |
197 | struct packed_git *p; | |
198 | int stale; | |
199 | int i = 0; | |
8f3f9b09 JH |
200 | |
201 | objdir = get_object_directory(); | |
202 | objdirlen = strlen(objdir); | |
203 | ||
a80d72db | 204 | for (p = get_packed_git(the_repository); p; p = p->next) { |
8f3f9b09 JH |
205 | /* we ignore things on alternate path since they are |
206 | * not available to the pullers in general. | |
207 | */ | |
f13d7db4 | 208 | if (!p->pack_local) |
8f3f9b09 JH |
209 | continue; |
210 | i++; | |
211 | } | |
212 | num_pack = i; | |
213 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
a80d72db | 214 | for (i = 0, p = get_packed_git(the_repository); p; p = p->next) { |
f13d7db4 | 215 | if (!p->pack_local) |
8f3f9b09 | 216 | continue; |
6f42f89c | 217 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
218 | info[i]->p = p; |
219 | info[i]->old_num = -1; | |
220 | i++; | |
221 | } | |
222 | ||
223 | if (infofile && !force) | |
224 | stale = read_pack_info_file(infofile); | |
225 | else | |
226 | stale = 1; | |
227 | ||
228 | for (i = 0; i < num_pack; i++) { | |
229 | if (stale) { | |
230 | info[i]->old_num = -1; | |
8f3f9b09 JH |
231 | info[i]->nr_heads = 0; |
232 | } | |
8f3f9b09 JH |
233 | } |
234 | ||
6f42f89c | 235 | /* renumber them */ |
9ed0d8d6 | 236 | QSORT(info, num_pack, compare_info); |
8f3f9b09 JH |
237 | for (i = 0; i < num_pack; i++) |
238 | info[i]->new_num = i; | |
8f3f9b09 JH |
239 | } |
240 | ||
3907a407 JK |
241 | static void free_pack_info(void) |
242 | { | |
243 | int i; | |
244 | for (i = 0; i < num_pack; i++) | |
245 | free(info[i]); | |
246 | free(info); | |
247 | } | |
248 | ||
d38379ec | 249 | static int write_pack_info_file(FILE *fp) |
8f3f9b09 | 250 | { |
3e15c67c | 251 | int i; |
d38379ec JK |
252 | for (i = 0; i < num_pack; i++) { |
253 | if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0) | |
254 | return -1; | |
255 | } | |
256 | if (fputc('\n', fp) == EOF) | |
257 | return -1; | |
258 | return 0; | |
8f3f9b09 JH |
259 | } |
260 | ||
261 | static int update_info_packs(int force) | |
262 | { | |
d38379ec JK |
263 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); |
264 | int ret; | |
8f3f9b09 JH |
265 | |
266 | init_pack_info(infofile, force); | |
d38379ec | 267 | ret = update_info_file(infofile, write_pack_info_file); |
3907a407 | 268 | free_pack_info(); |
d38379ec JK |
269 | free(infofile); |
270 | return ret; | |
8f3f9b09 JH |
271 | } |
272 | ||
8f3f9b09 JH |
273 | /* public */ |
274 | int update_server_info(int force) | |
275 | { | |
276 | /* We would add more dumb-server support files later, | |
277 | * including index of available pack files and their | |
278 | * intended audiences. | |
279 | */ | |
280 | int errs = 0; | |
281 | ||
282 | errs = errs | update_info_refs(force); | |
283 | errs = errs | update_info_packs(force); | |
8f3f9b09 | 284 | |
6f42f89c | 285 | /* remove leftover rev-cache file if there is any */ |
691f1a28 | 286 | unlink_or_warn(git_path("info/rev-cache")); |
6f42f89c | 287 | |
8f3f9b09 JH |
288 | return errs; |
289 | } |