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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 JH |
6 | |
7 | /* refs */ | |
8 | static FILE *info_ref_fp; | |
8f3f9b09 JH |
9 | |
10 | static int add_info_ref(const char *path, const unsigned char *sha1) | |
11 | { | |
f6b42a81 JH |
12 | struct object *o = parse_object(sha1); |
13 | ||
8f3f9b09 | 14 | fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path); |
f6b42a81 | 15 | if (o->type == tag_type) { |
9534f40b JH |
16 | o = deref_tag(o, path, 0); |
17 | if (o) | |
18 | fprintf(info_ref_fp, "%s %s^{}\n", | |
19 | sha1_to_hex(o->sha1), path); | |
f6b42a81 | 20 | } |
8f3f9b09 JH |
21 | return 0; |
22 | } | |
23 | ||
24 | static int update_info_refs(int force) | |
25 | { | |
8f3f9b09 JH |
26 | char *path0 = strdup(git_path("info/refs")); |
27 | int len = strlen(path0); | |
28 | char *path1 = xmalloc(len + 2); | |
29 | ||
30 | strcpy(path1, path0); | |
31 | strcpy(path1 + len, "+"); | |
32 | ||
8f3f9b09 JH |
33 | safe_create_leading_directories(path0); |
34 | info_ref_fp = fopen(path1, "w"); | |
35 | if (!info_ref_fp) | |
36 | return error("unable to update %s", path0); | |
37 | for_each_ref(add_info_ref); | |
38 | fclose(info_ref_fp); | |
39 | rename(path1, path0); | |
40 | free(path0); | |
41 | free(path1); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | /* packs */ | |
4d8fa916 | 46 | static struct pack_info { |
8f3f9b09 JH |
47 | struct packed_git *p; |
48 | int old_num; | |
49 | int new_num; | |
50 | int nr_alloc; | |
51 | int nr_heads; | |
52 | unsigned char (*head)[20]; | |
8f3f9b09 JH |
53 | } **info; |
54 | static int num_pack; | |
55 | static const char *objdir; | |
56 | static int objdirlen; | |
57 | ||
58 | static struct object *parse_object_cheap(const unsigned char *sha1) | |
59 | { | |
60 | struct object *o; | |
61 | ||
62 | if ((o = parse_object(sha1)) == NULL) | |
63 | return NULL; | |
64 | if (o->type == commit_type) { | |
65 | struct commit *commit = (struct commit *)o; | |
66 | free(commit->buffer); | |
67 | commit->buffer = NULL; | |
f22ca7c5 RF |
68 | } else if (o->type == tree_type) { |
69 | struct tree *tree = (struct tree *)o; | |
70 | struct tree_entry_list *e, *n; | |
71 | for (e = tree->entries; e; e = n) { | |
72 | free(e->name); | |
73 | e->name = NULL; | |
74 | n = e->next; | |
75 | free(e); | |
76 | } | |
77 | tree->entries = NULL; | |
8f3f9b09 JH |
78 | } |
79 | return o; | |
80 | } | |
81 | ||
82 | static struct pack_info *find_pack_by_name(const char *name) | |
83 | { | |
84 | int i; | |
85 | for (i = 0; i < num_pack; i++) { | |
86 | struct packed_git *p = info[i]->p; | |
87 | /* skip "/pack/" after ".git/objects" */ | |
88 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
89 | return info[i]; | |
90 | } | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | static struct pack_info *find_pack_by_old_num(int old_num) | |
95 | { | |
96 | int i; | |
97 | for (i = 0; i < num_pack; i++) | |
98 | if (info[i]->old_num == old_num) | |
99 | return info[i]; | |
100 | return NULL; | |
101 | } | |
102 | ||
8f3f9b09 JH |
103 | /* Returns non-zero when we detect that the info in the |
104 | * old file is useless. | |
105 | */ | |
106 | static int parse_pack_def(const char *line, int old_cnt) | |
107 | { | |
108 | struct pack_info *i = find_pack_by_name(line + 2); | |
109 | if (i) { | |
110 | i->old_num = old_cnt; | |
111 | return 0; | |
112 | } | |
113 | else { | |
6f42f89c | 114 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
115 | return 1; |
116 | } | |
117 | } | |
118 | ||
8f3f9b09 JH |
119 | /* Returns non-zero when we detect that the info in the |
120 | * old file is useless. | |
121 | */ | |
122 | static int read_pack_info_file(const char *infofile) | |
123 | { | |
124 | FILE *fp; | |
125 | char line[1000]; | |
126 | int old_cnt = 0; | |
127 | ||
128 | fp = fopen(infofile, "r"); | |
129 | if (!fp) | |
130 | return 1; /* nonexisting is not an error. */ | |
131 | ||
132 | while (fgets(line, sizeof(line), fp)) { | |
133 | int len = strlen(line); | |
134 | if (line[len-1] == '\n') | |
135 | line[len-1] = 0; | |
136 | ||
137 | switch (line[0]) { | |
138 | case 'P': /* P name */ | |
139 | if (parse_pack_def(line, old_cnt++)) | |
140 | goto out_stale; | |
141 | break; | |
6f42f89c JH |
142 | case 'D': /* we used to emit D but that was misguided. */ |
143 | goto out_stale; | |
8f3f9b09 | 144 | break; |
3e15c67c JH |
145 | case 'T': /* we used to emit T but nobody uses it. */ |
146 | goto out_stale; | |
8f3f9b09 JH |
147 | break; |
148 | default: | |
149 | error("unrecognized: %s", line); | |
150 | break; | |
151 | } | |
152 | } | |
153 | fclose(fp); | |
154 | return 0; | |
155 | out_stale: | |
156 | fclose(fp); | |
157 | return 1; | |
158 | } | |
159 | ||
8f3f9b09 JH |
160 | static int compare_info(const void *a_, const void *b_) |
161 | { | |
162 | struct pack_info * const* a = a_; | |
163 | struct pack_info * const* b = b_; | |
164 | ||
165 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
166 | /* Keep the order in the original */ | |
167 | return (*a)->old_num - (*b)->old_num; | |
168 | else if (0 <= (*a)->old_num) | |
169 | /* Only A existed in the original so B is obviously newer */ | |
170 | return -1; | |
171 | else if (0 <= (*b)->old_num) | |
172 | /* The other way around. */ | |
173 | return 1; | |
174 | ||
d5eac498 JH |
175 | /* then it does not matter but at least keep the comparison stable */ |
176 | return (*a)->p - (*b)->p; | |
8f3f9b09 JH |
177 | } |
178 | ||
179 | static void init_pack_info(const char *infofile, int force) | |
180 | { | |
181 | struct packed_git *p; | |
182 | int stale; | |
183 | int i = 0; | |
8f3f9b09 JH |
184 | |
185 | objdir = get_object_directory(); | |
186 | objdirlen = strlen(objdir); | |
187 | ||
188 | prepare_packed_git(); | |
189 | for (p = packed_git; p; p = p->next) { | |
190 | /* we ignore things on alternate path since they are | |
191 | * not available to the pullers in general. | |
192 | */ | |
193 | if (strncmp(p->pack_name, objdir, objdirlen) || | |
194 | strncmp(p->pack_name + objdirlen, "/pack/", 6)) | |
195 | continue; | |
196 | i++; | |
197 | } | |
198 | num_pack = i; | |
199 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
200 | for (i = 0, p = packed_git; p; p = p->next) { | |
201 | if (strncmp(p->pack_name, objdir, objdirlen) || | |
202 | p->pack_name[objdirlen] != '/') | |
203 | continue; | |
6f42f89c | 204 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
205 | info[i]->p = p; |
206 | info[i]->old_num = -1; | |
207 | i++; | |
208 | } | |
209 | ||
210 | if (infofile && !force) | |
211 | stale = read_pack_info_file(infofile); | |
212 | else | |
213 | stale = 1; | |
214 | ||
215 | for (i = 0; i < num_pack; i++) { | |
216 | if (stale) { | |
217 | info[i]->old_num = -1; | |
8f3f9b09 JH |
218 | info[i]->nr_heads = 0; |
219 | } | |
8f3f9b09 JH |
220 | } |
221 | ||
6f42f89c | 222 | /* renumber them */ |
8f3f9b09 JH |
223 | qsort(info, num_pack, sizeof(info[0]), compare_info); |
224 | for (i = 0; i < num_pack; i++) | |
225 | info[i]->new_num = i; | |
8f3f9b09 JH |
226 | } |
227 | ||
228 | static void write_pack_info_file(FILE *fp) | |
229 | { | |
3e15c67c | 230 | int i; |
8f3f9b09 JH |
231 | for (i = 0; i < num_pack; i++) |
232 | fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6); | |
8f3f9b09 JH |
233 | } |
234 | ||
235 | static int update_info_packs(int force) | |
236 | { | |
237 | char infofile[PATH_MAX]; | |
238 | char name[PATH_MAX]; | |
239 | int namelen; | |
240 | FILE *fp; | |
241 | ||
242 | namelen = sprintf(infofile, "%s/info/packs", get_object_directory()); | |
243 | strcpy(name, infofile); | |
244 | strcpy(name + namelen, "+"); | |
245 | ||
246 | init_pack_info(infofile, force); | |
8f3f9b09 JH |
247 | |
248 | safe_create_leading_directories(name); | |
249 | fp = fopen(name, "w"); | |
250 | if (!fp) | |
251 | return error("cannot open %s", name); | |
252 | write_pack_info_file(fp); | |
253 | fclose(fp); | |
254 | rename(name, infofile); | |
255 | return 0; | |
256 | } | |
257 | ||
8f3f9b09 JH |
258 | /* public */ |
259 | int update_server_info(int force) | |
260 | { | |
261 | /* We would add more dumb-server support files later, | |
262 | * including index of available pack files and their | |
263 | * intended audiences. | |
264 | */ | |
265 | int errs = 0; | |
266 | ||
267 | errs = errs | update_info_refs(force); | |
268 | errs = errs | update_info_packs(force); | |
8f3f9b09 | 269 | |
6f42f89c JH |
270 | /* remove leftover rev-cache file if there is any */ |
271 | unlink(git_path("info/rev-cache")); | |
272 | ||
8f3f9b09 JH |
273 | return errs; |
274 | } |