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