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1 | #include "cache.h" | |
2 | #include "refs.h" | |
3 | #include "object.h" | |
4 | #include "commit.h" | |
5 | #include "tag.h" | |
6 | ||
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; | |
17 | FILE *fp = NULL; | |
18 | ||
19 | safe_create_leading_directories(path); | |
20 | fd = mkstemp(tmp); | |
21 | if (fd < 0) | |
22 | goto out; | |
23 | fp = fdopen(fd, "w"); | |
24 | if (!fp) | |
25 | goto out; | |
26 | ret = generate(fp); | |
27 | if (ret) | |
28 | goto out; | |
29 | if (fclose(fp)) | |
30 | goto out; | |
31 | if (adjust_shared_perm(tmp) < 0) | |
32 | goto out; | |
33 | if (rename(tmp, path) < 0) | |
34 | goto out; | |
35 | ret = 0; | |
36 | ||
37 | out: | |
38 | if (ret) { | |
39 | error("unable to update %s: %s", path, strerror(errno)); | |
40 | if (fp) | |
41 | fclose(fp); | |
42 | else if (fd >= 0) | |
43 | close(fd); | |
44 | unlink(tmp); | |
45 | } | |
46 | free(tmp); | |
47 | return ret; | |
48 | } | |
49 | ||
50 | static int add_info_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data) | |
51 | { | |
52 | FILE *fp = cb_data; | |
53 | struct object *o = parse_object(sha1); | |
54 | if (!o) | |
55 | return -1; | |
56 | ||
57 | if (fprintf(fp, "%s %s\n", sha1_to_hex(sha1), path) < 0) | |
58 | return -1; | |
59 | ||
60 | if (o->type == OBJ_TAG) { | |
61 | o = deref_tag(o, path, 0); | |
62 | if (o) | |
63 | if (fprintf(fp, "%s %s^{}\n", | |
64 | sha1_to_hex(o->sha1), path) < 0) | |
65 | return -1; | |
66 | } | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int generate_info_refs(FILE *fp) | |
71 | { | |
72 | return for_each_ref(add_info_ref, fp); | |
73 | } | |
74 | ||
75 | static int update_info_refs(int force) | |
76 | { | |
77 | char *path = git_pathdup("info/refs"); | |
78 | int ret = update_info_file(path, generate_info_refs); | |
79 | free(path); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | /* packs */ | |
84 | static struct pack_info { | |
85 | struct packed_git *p; | |
86 | int old_num; | |
87 | int new_num; | |
88 | int nr_alloc; | |
89 | int nr_heads; | |
90 | unsigned char (*head)[20]; | |
91 | } **info; | |
92 | static int num_pack; | |
93 | static const char *objdir; | |
94 | static int objdirlen; | |
95 | ||
96 | static struct pack_info *find_pack_by_name(const char *name) | |
97 | { | |
98 | int i; | |
99 | for (i = 0; i < num_pack; i++) { | |
100 | struct packed_git *p = info[i]->p; | |
101 | /* skip "/pack/" after ".git/objects" */ | |
102 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
103 | return info[i]; | |
104 | } | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | /* Returns non-zero when we detect that the info in the | |
109 | * old file is useless. | |
110 | */ | |
111 | static int parse_pack_def(const char *line, int old_cnt) | |
112 | { | |
113 | struct pack_info *i = find_pack_by_name(line + 2); | |
114 | if (i) { | |
115 | i->old_num = old_cnt; | |
116 | return 0; | |
117 | } | |
118 | else { | |
119 | /* The file describes a pack that is no longer here */ | |
120 | return 1; | |
121 | } | |
122 | } | |
123 | ||
124 | /* Returns non-zero when we detect that the info in the | |
125 | * old file is useless. | |
126 | */ | |
127 | static int read_pack_info_file(const char *infofile) | |
128 | { | |
129 | FILE *fp; | |
130 | char line[1000]; | |
131 | int old_cnt = 0; | |
132 | ||
133 | fp = fopen(infofile, "r"); | |
134 | if (!fp) | |
135 | return 1; /* nonexistent is not an error. */ | |
136 | ||
137 | while (fgets(line, sizeof(line), fp)) { | |
138 | int len = strlen(line); | |
139 | if (len && line[len-1] == '\n') | |
140 | line[--len] = 0; | |
141 | ||
142 | if (!len) | |
143 | continue; | |
144 | ||
145 | switch (line[0]) { | |
146 | case 'P': /* P name */ | |
147 | if (parse_pack_def(line, old_cnt++)) | |
148 | goto out_stale; | |
149 | break; | |
150 | case 'D': /* we used to emit D but that was misguided. */ | |
151 | case 'T': /* we used to emit T but nobody uses it. */ | |
152 | goto out_stale; | |
153 | default: | |
154 | error("unrecognized: %s", line); | |
155 | break; | |
156 | } | |
157 | } | |
158 | fclose(fp); | |
159 | return 0; | |
160 | out_stale: | |
161 | fclose(fp); | |
162 | return 1; | |
163 | } | |
164 | ||
165 | static int compare_info(const void *a_, const void *b_) | |
166 | { | |
167 | struct pack_info *const *a = a_; | |
168 | struct pack_info *const *b = b_; | |
169 | ||
170 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
171 | /* Keep the order in the original */ | |
172 | return (*a)->old_num - (*b)->old_num; | |
173 | else if (0 <= (*a)->old_num) | |
174 | /* Only A existed in the original so B is obviously newer */ | |
175 | return -1; | |
176 | else if (0 <= (*b)->old_num) | |
177 | /* The other way around. */ | |
178 | return 1; | |
179 | ||
180 | /* then it does not matter but at least keep the comparison stable */ | |
181 | if ((*a)->p == (*b)->p) | |
182 | return 0; | |
183 | else if ((*a)->p < (*b)->p) | |
184 | return -1; | |
185 | else | |
186 | return 1; | |
187 | } | |
188 | ||
189 | static void init_pack_info(const char *infofile, int force) | |
190 | { | |
191 | struct packed_git *p; | |
192 | int stale; | |
193 | int i = 0; | |
194 | ||
195 | objdir = get_object_directory(); | |
196 | objdirlen = strlen(objdir); | |
197 | ||
198 | prepare_packed_git(); | |
199 | for (p = packed_git; p; p = p->next) { | |
200 | /* we ignore things on alternate path since they are | |
201 | * not available to the pullers in general. | |
202 | */ | |
203 | if (!p->pack_local) | |
204 | continue; | |
205 | i++; | |
206 | } | |
207 | num_pack = i; | |
208 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
209 | for (i = 0, p = packed_git; p; p = p->next) { | |
210 | if (!p->pack_local) | |
211 | continue; | |
212 | info[i] = xcalloc(1, sizeof(struct pack_info)); | |
213 | info[i]->p = p; | |
214 | info[i]->old_num = -1; | |
215 | i++; | |
216 | } | |
217 | ||
218 | if (infofile && !force) | |
219 | stale = read_pack_info_file(infofile); | |
220 | else | |
221 | stale = 1; | |
222 | ||
223 | for (i = 0; i < num_pack; i++) { | |
224 | if (stale) { | |
225 | info[i]->old_num = -1; | |
226 | info[i]->nr_heads = 0; | |
227 | } | |
228 | } | |
229 | ||
230 | /* renumber them */ | |
231 | qsort(info, num_pack, sizeof(info[0]), compare_info); | |
232 | for (i = 0; i < num_pack; i++) | |
233 | info[i]->new_num = i; | |
234 | } | |
235 | ||
236 | static int write_pack_info_file(FILE *fp) | |
237 | { | |
238 | int i; | |
239 | for (i = 0; i < num_pack; i++) { | |
240 | if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0) | |
241 | return -1; | |
242 | } | |
243 | if (fputc('\n', fp) == EOF) | |
244 | return -1; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int update_info_packs(int force) | |
249 | { | |
250 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); | |
251 | int ret; | |
252 | ||
253 | init_pack_info(infofile, force); | |
254 | ret = update_info_file(infofile, write_pack_info_file); | |
255 | free(infofile); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /* public */ | |
260 | int update_server_info(int force) | |
261 | { | |
262 | /* We would add more dumb-server support files later, | |
263 | * including index of available pack files and their | |
264 | * intended audiences. | |
265 | */ | |
266 | int errs = 0; | |
267 | ||
268 | errs = errs | update_info_refs(force); | |
269 | errs = errs | update_info_packs(force); | |
270 | ||
271 | /* remove leftover rev-cache file if there is any */ | |
272 | unlink_or_warn(git_path("info/rev-cache")); | |
273 | ||
274 | return errs; | |
275 | } |