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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" |
0abe14f6 | 6 | #include "packfile.h" |
8f3f9b09 | 7 | |
d38379ec JK |
8 | /* |
9 | * Create the file "path" by writing to a temporary file and renaming | |
10 | * it into place. The contents of the file come from "generate", which | |
11 | * should return non-zero if it encounters an error. | |
12 | */ | |
13 | static int update_info_file(char *path, int (*generate)(FILE *)) | |
14 | { | |
15 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
16 | int ret = -1; | |
17 | int fd = -1; | |
fa1912c8 | 18 | FILE *fp = NULL, *to_close; |
d38379ec JK |
19 | |
20 | safe_create_leading_directories(path); | |
d91175b2 | 21 | fd = git_mkstemp_mode(tmp, 0666); |
d38379ec JK |
22 | if (fd < 0) |
23 | goto out; | |
fa1912c8 | 24 | to_close = fp = fdopen(fd, "w"); |
d38379ec JK |
25 | if (!fp) |
26 | goto out; | |
fa1912c8 | 27 | fd = -1; |
d38379ec JK |
28 | ret = generate(fp); |
29 | if (ret) | |
30 | goto out; | |
fa1912c8 RS |
31 | fp = NULL; |
32 | if (fclose(to_close)) | |
d38379ec JK |
33 | goto out; |
34 | if (adjust_shared_perm(tmp) < 0) | |
35 | goto out; | |
36 | if (rename(tmp, path) < 0) | |
37 | goto out; | |
38 | ret = 0; | |
39 | ||
40 | out: | |
41 | if (ret) { | |
02382f51 | 42 | error_errno("unable to update %s", path); |
d38379ec JK |
43 | if (fp) |
44 | fclose(fp); | |
45 | else if (fd >= 0) | |
46 | close(fd); | |
47 | unlink(tmp); | |
48 | } | |
49 | free(tmp); | |
50 | return ret; | |
51 | } | |
8f3f9b09 | 52 | |
e2b0bcdf MH |
53 | static int add_info_ref(const char *path, const struct object_id *oid, |
54 | int flag, void *cb_data) | |
8f3f9b09 | 55 | { |
d38379ec | 56 | FILE *fp = cb_data; |
c251c83d | 57 | struct object *o = parse_object(oid); |
76f8a302 SP |
58 | if (!o) |
59 | return -1; | |
f6b42a81 | 60 | |
e2b0bcdf | 61 | if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0) |
d38379ec JK |
62 | return -1; |
63 | ||
1974632c | 64 | if (o->type == OBJ_TAG) { |
9534f40b JH |
65 | o = deref_tag(o, path, 0); |
66 | if (o) | |
d38379ec | 67 | if (fprintf(fp, "%s %s^{}\n", |
f2fd0760 | 68 | oid_to_hex(&o->oid), path) < 0) |
d38379ec | 69 | return -1; |
f6b42a81 | 70 | } |
8f3f9b09 JH |
71 | return 0; |
72 | } | |
73 | ||
d38379ec JK |
74 | static int generate_info_refs(FILE *fp) |
75 | { | |
e2b0bcdf | 76 | return for_each_ref(add_info_ref, fp); |
d38379ec JK |
77 | } |
78 | ||
8f3f9b09 JH |
79 | static int update_info_refs(int force) |
80 | { | |
d38379ec JK |
81 | char *path = git_pathdup("info/refs"); |
82 | int ret = update_info_file(path, generate_info_refs); | |
83 | free(path); | |
84 | return ret; | |
8f3f9b09 JH |
85 | } |
86 | ||
87 | /* packs */ | |
4d8fa916 | 88 | static struct pack_info { |
8f3f9b09 JH |
89 | struct packed_git *p; |
90 | int old_num; | |
91 | int new_num; | |
92 | int nr_alloc; | |
93 | int nr_heads; | |
94 | unsigned char (*head)[20]; | |
8f3f9b09 JH |
95 | } **info; |
96 | static int num_pack; | |
97 | static const char *objdir; | |
98 | static int objdirlen; | |
99 | ||
8f3f9b09 JH |
100 | static struct pack_info *find_pack_by_name(const char *name) |
101 | { | |
102 | int i; | |
103 | for (i = 0; i < num_pack; i++) { | |
104 | struct packed_git *p = info[i]->p; | |
105 | /* skip "/pack/" after ".git/objects" */ | |
106 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
107 | return info[i]; | |
108 | } | |
109 | return NULL; | |
110 | } | |
111 | ||
8f3f9b09 JH |
112 | /* Returns non-zero when we detect that the info in the |
113 | * old file is useless. | |
114 | */ | |
115 | static int parse_pack_def(const char *line, int old_cnt) | |
116 | { | |
117 | struct pack_info *i = find_pack_by_name(line + 2); | |
118 | if (i) { | |
119 | i->old_num = old_cnt; | |
120 | return 0; | |
121 | } | |
122 | else { | |
6f42f89c | 123 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
124 | return 1; |
125 | } | |
126 | } | |
127 | ||
8f3f9b09 JH |
128 | /* Returns non-zero when we detect that the info in the |
129 | * old file is useless. | |
130 | */ | |
131 | static int read_pack_info_file(const char *infofile) | |
132 | { | |
133 | FILE *fp; | |
134 | char line[1000]; | |
135 | int old_cnt = 0; | |
136 | ||
e9d983f1 | 137 | fp = fopen_or_warn(infofile, "r"); |
8f3f9b09 | 138 | if (!fp) |
addf88e4 | 139 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 JH |
140 | |
141 | while (fgets(line, sizeof(line), fp)) { | |
142 | int len = strlen(line); | |
872c930d | 143 | if (len && line[len-1] == '\n') |
8ac4838a JH |
144 | line[--len] = 0; |
145 | ||
146 | if (!len) | |
147 | continue; | |
8f3f9b09 JH |
148 | |
149 | switch (line[0]) { | |
150 | case 'P': /* P name */ | |
151 | if (parse_pack_def(line, old_cnt++)) | |
152 | goto out_stale; | |
153 | break; | |
6f42f89c | 154 | case 'D': /* we used to emit D but that was misguided. */ |
3e15c67c JH |
155 | case 'T': /* we used to emit T but nobody uses it. */ |
156 | goto out_stale; | |
8f3f9b09 JH |
157 | default: |
158 | error("unrecognized: %s", line); | |
159 | break; | |
160 | } | |
161 | } | |
162 | fclose(fp); | |
163 | return 0; | |
164 | out_stale: | |
165 | fclose(fp); | |
166 | return 1; | |
167 | } | |
168 | ||
8f3f9b09 JH |
169 | static int compare_info(const void *a_, const void *b_) |
170 | { | |
4b25d091 FC |
171 | struct pack_info *const *a = a_; |
172 | struct pack_info *const *b = b_; | |
8f3f9b09 JH |
173 | |
174 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
175 | /* Keep the order in the original */ | |
176 | return (*a)->old_num - (*b)->old_num; | |
177 | else if (0 <= (*a)->old_num) | |
178 | /* Only A existed in the original so B is obviously newer */ | |
179 | return -1; | |
180 | else if (0 <= (*b)->old_num) | |
181 | /* The other way around. */ | |
182 | return 1; | |
183 | ||
d5eac498 | 184 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
185 | if ((*a)->p == (*b)->p) |
186 | return 0; | |
187 | else if ((*a)->p < (*b)->p) | |
188 | return -1; | |
189 | else | |
190 | return 1; | |
8f3f9b09 JH |
191 | } |
192 | ||
193 | static void init_pack_info(const char *infofile, int force) | |
194 | { | |
195 | struct packed_git *p; | |
196 | int stale; | |
197 | int i = 0; | |
8f3f9b09 JH |
198 | |
199 | objdir = get_object_directory(); | |
200 | objdirlen = strlen(objdir); | |
201 | ||
202 | prepare_packed_git(); | |
203 | for (p = packed_git; p; p = p->next) { | |
204 | /* we ignore things on alternate path since they are | |
205 | * not available to the pullers in general. | |
206 | */ | |
f13d7db4 | 207 | if (!p->pack_local) |
8f3f9b09 JH |
208 | continue; |
209 | i++; | |
210 | } | |
211 | num_pack = i; | |
212 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
213 | for (i = 0, p = packed_git; p; p = p->next) { | |
f13d7db4 | 214 | if (!p->pack_local) |
8f3f9b09 | 215 | continue; |
6f42f89c | 216 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
217 | info[i]->p = p; |
218 | info[i]->old_num = -1; | |
219 | i++; | |
220 | } | |
221 | ||
222 | if (infofile && !force) | |
223 | stale = read_pack_info_file(infofile); | |
224 | else | |
225 | stale = 1; | |
226 | ||
227 | for (i = 0; i < num_pack; i++) { | |
228 | if (stale) { | |
229 | info[i]->old_num = -1; | |
8f3f9b09 JH |
230 | info[i]->nr_heads = 0; |
231 | } | |
8f3f9b09 JH |
232 | } |
233 | ||
6f42f89c | 234 | /* renumber them */ |
9ed0d8d6 | 235 | QSORT(info, num_pack, compare_info); |
8f3f9b09 JH |
236 | for (i = 0; i < num_pack; i++) |
237 | info[i]->new_num = i; | |
8f3f9b09 JH |
238 | } |
239 | ||
3907a407 JK |
240 | static void free_pack_info(void) |
241 | { | |
242 | int i; | |
243 | for (i = 0; i < num_pack; i++) | |
244 | free(info[i]); | |
245 | free(info); | |
246 | } | |
247 | ||
d38379ec | 248 | static int write_pack_info_file(FILE *fp) |
8f3f9b09 | 249 | { |
3e15c67c | 250 | int i; |
d38379ec JK |
251 | for (i = 0; i < num_pack; i++) { |
252 | if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0) | |
253 | return -1; | |
254 | } | |
255 | if (fputc('\n', fp) == EOF) | |
256 | return -1; | |
257 | return 0; | |
8f3f9b09 JH |
258 | } |
259 | ||
260 | static int update_info_packs(int force) | |
261 | { | |
d38379ec JK |
262 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); |
263 | int ret; | |
8f3f9b09 JH |
264 | |
265 | init_pack_info(infofile, force); | |
d38379ec | 266 | ret = update_info_file(infofile, write_pack_info_file); |
3907a407 | 267 | free_pack_info(); |
d38379ec JK |
268 | free(infofile); |
269 | return ret; | |
8f3f9b09 JH |
270 | } |
271 | ||
8f3f9b09 JH |
272 | /* public */ |
273 | int update_server_info(int force) | |
274 | { | |
275 | /* We would add more dumb-server support files later, | |
276 | * including index of available pack files and their | |
277 | * intended audiences. | |
278 | */ | |
279 | int errs = 0; | |
280 | ||
281 | errs = errs | update_info_refs(force); | |
282 | errs = errs | update_info_packs(force); | |
8f3f9b09 | 283 | |
6f42f89c | 284 | /* remove leftover rev-cache file if there is any */ |
691f1a28 | 285 | unlink_or_warn(git_path("info/rev-cache")); |
6f42f89c | 286 | |
8f3f9b09 JH |
287 | return errs; |
288 | } |