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1 | #include "cache.h" | |
2 | #include "dir.h" | |
3 | #include "repository.h" | |
4 | #include "refs.h" | |
5 | #include "object.h" | |
6 | #include "commit.h" | |
7 | #include "tag.h" | |
8 | #include "packfile.h" | |
9 | #include "object-store.h" | |
10 | ||
11 | /* | |
12 | * Create the file "path" by writing to a temporary file and renaming | |
13 | * it into place. The contents of the file come from "generate", which | |
14 | * should return non-zero if it encounters an error. | |
15 | */ | |
16 | static int update_info_file(char *path, int (*generate)(FILE *)) | |
17 | { | |
18 | char *tmp = mkpathdup("%s_XXXXXX", path); | |
19 | int ret = -1; | |
20 | int fd = -1; | |
21 | FILE *fp = NULL, *to_close; | |
22 | ||
23 | safe_create_leading_directories(path); | |
24 | fd = git_mkstemp_mode(tmp, 0666); | |
25 | if (fd < 0) | |
26 | goto out; | |
27 | to_close = fp = fdopen(fd, "w"); | |
28 | if (!fp) | |
29 | goto out; | |
30 | fd = -1; | |
31 | ret = generate(fp); | |
32 | if (ret) | |
33 | goto out; | |
34 | fp = NULL; | |
35 | if (fclose(to_close)) | |
36 | goto out; | |
37 | if (adjust_shared_perm(tmp) < 0) | |
38 | goto out; | |
39 | if (rename(tmp, path) < 0) | |
40 | goto out; | |
41 | ret = 0; | |
42 | ||
43 | out: | |
44 | if (ret) { | |
45 | error_errno("unable to update %s", path); | |
46 | if (fp) | |
47 | fclose(fp); | |
48 | else if (fd >= 0) | |
49 | close(fd); | |
50 | unlink(tmp); | |
51 | } | |
52 | free(tmp); | |
53 | return ret; | |
54 | } | |
55 | ||
56 | static int add_info_ref(const char *path, const struct object_id *oid, | |
57 | int flag, void *cb_data) | |
58 | { | |
59 | FILE *fp = cb_data; | |
60 | struct object *o = parse_object(the_repository, oid); | |
61 | if (!o) | |
62 | return -1; | |
63 | ||
64 | if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0) | |
65 | return -1; | |
66 | ||
67 | if (o->type == OBJ_TAG) { | |
68 | o = deref_tag(the_repository, o, path, 0); | |
69 | if (o) | |
70 | if (fprintf(fp, "%s %s^{}\n", | |
71 | oid_to_hex(&o->oid), path) < 0) | |
72 | return -1; | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int generate_info_refs(FILE *fp) | |
78 | { | |
79 | return for_each_ref(add_info_ref, fp); | |
80 | } | |
81 | ||
82 | static int update_info_refs(void) | |
83 | { | |
84 | char *path = git_pathdup("info/refs"); | |
85 | int ret = update_info_file(path, generate_info_refs); | |
86 | free(path); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | /* packs */ | |
91 | static struct pack_info { | |
92 | struct packed_git *p; | |
93 | int old_num; | |
94 | int new_num; | |
95 | } **info; | |
96 | static int num_pack; | |
97 | ||
98 | static struct pack_info *find_pack_by_name(const char *name) | |
99 | { | |
100 | int i; | |
101 | for (i = 0; i < num_pack; i++) { | |
102 | struct packed_git *p = info[i]->p; | |
103 | if (!strcmp(pack_basename(p), name)) | |
104 | return info[i]; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | /* Returns non-zero when we detect that the info in the | |
110 | * old file is useless. | |
111 | */ | |
112 | static int parse_pack_def(const char *packname, int old_cnt) | |
113 | { | |
114 | struct pack_info *i = find_pack_by_name(packname); | |
115 | if (i) { | |
116 | i->old_num = old_cnt; | |
117 | return 0; | |
118 | } | |
119 | else { | |
120 | /* The file describes a pack that is no longer here */ | |
121 | return 1; | |
122 | } | |
123 | } | |
124 | ||
125 | /* Returns non-zero when we detect that the info in the | |
126 | * old file is useless. | |
127 | */ | |
128 | static int read_pack_info_file(const char *infofile) | |
129 | { | |
130 | FILE *fp; | |
131 | struct strbuf line = STRBUF_INIT; | |
132 | int old_cnt = 0; | |
133 | int stale = 1; | |
134 | ||
135 | fp = fopen_or_warn(infofile, "r"); | |
136 | if (!fp) | |
137 | return 1; /* nonexistent is not an error. */ | |
138 | ||
139 | while (strbuf_getline(&line, fp) != EOF) { | |
140 | const char *arg; | |
141 | ||
142 | if (!line.len) | |
143 | continue; | |
144 | ||
145 | if (skip_prefix(line.buf, "P ", &arg)) { | |
146 | /* P name */ | |
147 | if (parse_pack_def(arg, old_cnt++)) | |
148 | goto out_stale; | |
149 | } else if (line.buf[0] == 'D') { | |
150 | /* we used to emit D but that was misguided. */ | |
151 | goto out_stale; | |
152 | } else if (line.buf[0] == 'T') { | |
153 | /* we used to emit T but nobody uses it. */ | |
154 | goto out_stale; | |
155 | } else { | |
156 | error("unrecognized: %s", line.buf); | |
157 | } | |
158 | } | |
159 | stale = 0; | |
160 | ||
161 | out_stale: | |
162 | strbuf_release(&line); | |
163 | fclose(fp); | |
164 | return stale; | |
165 | } | |
166 | ||
167 | static int compare_info(const void *a_, const void *b_) | |
168 | { | |
169 | struct pack_info *const *a = a_; | |
170 | struct pack_info *const *b = b_; | |
171 | ||
172 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
173 | /* Keep the order in the original */ | |
174 | return (*a)->old_num - (*b)->old_num; | |
175 | else if (0 <= (*a)->old_num) | |
176 | /* Only A existed in the original so B is obviously newer */ | |
177 | return -1; | |
178 | else if (0 <= (*b)->old_num) | |
179 | /* The other way around. */ | |
180 | return 1; | |
181 | ||
182 | /* then it does not matter but at least keep the comparison stable */ | |
183 | if ((*a)->p == (*b)->p) | |
184 | return 0; | |
185 | else if ((*a)->p < (*b)->p) | |
186 | return -1; | |
187 | else | |
188 | return 1; | |
189 | } | |
190 | ||
191 | static void init_pack_info(const char *infofile, int force) | |
192 | { | |
193 | struct packed_git *p; | |
194 | int stale; | |
195 | int i; | |
196 | size_t alloc = 0; | |
197 | ||
198 | for (p = get_all_packs(the_repository); p; p = p->next) { | |
199 | /* we ignore things on alternate path since they are | |
200 | * not available to the pullers in general. | |
201 | */ | |
202 | if (!p->pack_local || !file_exists(p->pack_name)) | |
203 | continue; | |
204 | ||
205 | i = num_pack++; | |
206 | ALLOC_GROW(info, num_pack, alloc); | |
207 | info[i] = xcalloc(1, sizeof(struct pack_info)); | |
208 | info[i]->p = p; | |
209 | info[i]->old_num = -1; | |
210 | } | |
211 | ||
212 | if (infofile && !force) | |
213 | stale = read_pack_info_file(infofile); | |
214 | else | |
215 | stale = 1; | |
216 | ||
217 | for (i = 0; i < num_pack; i++) | |
218 | if (stale) | |
219 | info[i]->old_num = -1; | |
220 | ||
221 | /* renumber them */ | |
222 | QSORT(info, num_pack, compare_info); | |
223 | for (i = 0; i < num_pack; i++) | |
224 | info[i]->new_num = i; | |
225 | } | |
226 | ||
227 | static void free_pack_info(void) | |
228 | { | |
229 | int i; | |
230 | for (i = 0; i < num_pack; i++) | |
231 | free(info[i]); | |
232 | free(info); | |
233 | } | |
234 | ||
235 | static int write_pack_info_file(FILE *fp) | |
236 | { | |
237 | int i; | |
238 | for (i = 0; i < num_pack; i++) { | |
239 | if (fprintf(fp, "P %s\n", pack_basename(info[i]->p)) < 0) | |
240 | return -1; | |
241 | } | |
242 | if (fputc('\n', fp) == EOF) | |
243 | return -1; | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static int update_info_packs(int force) | |
248 | { | |
249 | char *infofile = mkpathdup("%s/info/packs", get_object_directory()); | |
250 | int ret; | |
251 | ||
252 | init_pack_info(infofile, force); | |
253 | ret = update_info_file(infofile, write_pack_info_file); | |
254 | free_pack_info(); | |
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(); | |
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 | } |