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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 | 9 | |
8da19775 | 10 | static int add_info_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data) |
8f3f9b09 | 11 | { |
f6b42a81 | 12 | struct object *o = parse_object(sha1); |
76f8a302 SP |
13 | if (!o) |
14 | return -1; | |
f6b42a81 | 15 | |
8f3f9b09 | 16 | fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path); |
1974632c | 17 | if (o->type == OBJ_TAG) { |
9534f40b JH |
18 | o = deref_tag(o, path, 0); |
19 | if (o) | |
20 | fprintf(info_ref_fp, "%s %s^{}\n", | |
21 | sha1_to_hex(o->sha1), path); | |
f6b42a81 | 22 | } |
8f3f9b09 JH |
23 | return 0; |
24 | } | |
25 | ||
26 | static int update_info_refs(int force) | |
27 | { | |
9befac47 | 28 | char *path0 = xstrdup(git_path("info/refs")); |
8f3f9b09 JH |
29 | int len = strlen(path0); |
30 | char *path1 = xmalloc(len + 2); | |
31 | ||
32 | strcpy(path1, path0); | |
33 | strcpy(path1 + len, "+"); | |
34 | ||
8f3f9b09 JH |
35 | safe_create_leading_directories(path0); |
36 | info_ref_fp = fopen(path1, "w"); | |
37 | if (!info_ref_fp) | |
38 | return error("unable to update %s", path0); | |
cb5d709f | 39 | for_each_ref(add_info_ref, NULL); |
8f3f9b09 JH |
40 | fclose(info_ref_fp); |
41 | rename(path1, path0); | |
42 | free(path0); | |
43 | free(path1); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* packs */ | |
4d8fa916 | 48 | static struct pack_info { |
8f3f9b09 JH |
49 | struct packed_git *p; |
50 | int old_num; | |
51 | int new_num; | |
52 | int nr_alloc; | |
53 | int nr_heads; | |
54 | unsigned char (*head)[20]; | |
8f3f9b09 JH |
55 | } **info; |
56 | static int num_pack; | |
57 | static const char *objdir; | |
58 | static int objdirlen; | |
59 | ||
8f3f9b09 JH |
60 | static struct pack_info *find_pack_by_name(const char *name) |
61 | { | |
62 | int i; | |
63 | for (i = 0; i < num_pack; i++) { | |
64 | struct packed_git *p = info[i]->p; | |
65 | /* skip "/pack/" after ".git/objects" */ | |
66 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
67 | return info[i]; | |
68 | } | |
69 | return NULL; | |
70 | } | |
71 | ||
8f3f9b09 JH |
72 | /* Returns non-zero when we detect that the info in the |
73 | * old file is useless. | |
74 | */ | |
75 | static int parse_pack_def(const char *line, int old_cnt) | |
76 | { | |
77 | struct pack_info *i = find_pack_by_name(line + 2); | |
78 | if (i) { | |
79 | i->old_num = old_cnt; | |
80 | return 0; | |
81 | } | |
82 | else { | |
6f42f89c | 83 | /* The file describes a pack that is no longer here */ |
8f3f9b09 JH |
84 | return 1; |
85 | } | |
86 | } | |
87 | ||
8f3f9b09 JH |
88 | /* Returns non-zero when we detect that the info in the |
89 | * old file is useless. | |
90 | */ | |
91 | static int read_pack_info_file(const char *infofile) | |
92 | { | |
93 | FILE *fp; | |
94 | char line[1000]; | |
95 | int old_cnt = 0; | |
96 | ||
97 | fp = fopen(infofile, "r"); | |
98 | if (!fp) | |
addf88e4 | 99 | return 1; /* nonexistent is not an error. */ |
8f3f9b09 JH |
100 | |
101 | while (fgets(line, sizeof(line), fp)) { | |
102 | int len = strlen(line); | |
103 | if (line[len-1] == '\n') | |
8ac4838a JH |
104 | line[--len] = 0; |
105 | ||
106 | if (!len) | |
107 | continue; | |
8f3f9b09 JH |
108 | |
109 | switch (line[0]) { | |
110 | case 'P': /* P name */ | |
111 | if (parse_pack_def(line, old_cnt++)) | |
112 | goto out_stale; | |
113 | break; | |
6f42f89c JH |
114 | case 'D': /* we used to emit D but that was misguided. */ |
115 | goto out_stale; | |
8f3f9b09 | 116 | break; |
3e15c67c JH |
117 | case 'T': /* we used to emit T but nobody uses it. */ |
118 | goto out_stale; | |
8f3f9b09 JH |
119 | break; |
120 | default: | |
121 | error("unrecognized: %s", line); | |
122 | break; | |
123 | } | |
124 | } | |
125 | fclose(fp); | |
126 | return 0; | |
127 | out_stale: | |
128 | fclose(fp); | |
129 | return 1; | |
130 | } | |
131 | ||
8f3f9b09 JH |
132 | static int compare_info(const void *a_, const void *b_) |
133 | { | |
134 | struct pack_info * const* a = a_; | |
135 | struct pack_info * const* b = b_; | |
136 | ||
137 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
138 | /* Keep the order in the original */ | |
139 | return (*a)->old_num - (*b)->old_num; | |
140 | else if (0 <= (*a)->old_num) | |
141 | /* Only A existed in the original so B is obviously newer */ | |
142 | return -1; | |
143 | else if (0 <= (*b)->old_num) | |
144 | /* The other way around. */ | |
145 | return 1; | |
146 | ||
d5eac498 | 147 | /* then it does not matter but at least keep the comparison stable */ |
2dee5816 JH |
148 | if ((*a)->p == (*b)->p) |
149 | return 0; | |
150 | else if ((*a)->p < (*b)->p) | |
151 | return -1; | |
152 | else | |
153 | return 1; | |
8f3f9b09 JH |
154 | } |
155 | ||
156 | static void init_pack_info(const char *infofile, int force) | |
157 | { | |
158 | struct packed_git *p; | |
159 | int stale; | |
160 | int i = 0; | |
8f3f9b09 JH |
161 | |
162 | objdir = get_object_directory(); | |
163 | objdirlen = strlen(objdir); | |
164 | ||
165 | prepare_packed_git(); | |
166 | for (p = packed_git; p; p = p->next) { | |
167 | /* we ignore things on alternate path since they are | |
168 | * not available to the pullers in general. | |
169 | */ | |
f13d7db4 | 170 | if (!p->pack_local) |
8f3f9b09 JH |
171 | continue; |
172 | i++; | |
173 | } | |
174 | num_pack = i; | |
175 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
176 | for (i = 0, p = packed_git; p; p = p->next) { | |
f13d7db4 | 177 | if (!p->pack_local) |
8f3f9b09 | 178 | continue; |
6f42f89c | 179 | info[i] = xcalloc(1, sizeof(struct pack_info)); |
8f3f9b09 JH |
180 | info[i]->p = p; |
181 | info[i]->old_num = -1; | |
182 | i++; | |
183 | } | |
184 | ||
185 | if (infofile && !force) | |
186 | stale = read_pack_info_file(infofile); | |
187 | else | |
188 | stale = 1; | |
189 | ||
190 | for (i = 0; i < num_pack; i++) { | |
191 | if (stale) { | |
192 | info[i]->old_num = -1; | |
8f3f9b09 JH |
193 | info[i]->nr_heads = 0; |
194 | } | |
8f3f9b09 JH |
195 | } |
196 | ||
6f42f89c | 197 | /* renumber them */ |
8f3f9b09 JH |
198 | qsort(info, num_pack, sizeof(info[0]), compare_info); |
199 | for (i = 0; i < num_pack; i++) | |
200 | info[i]->new_num = i; | |
8f3f9b09 JH |
201 | } |
202 | ||
203 | static void write_pack_info_file(FILE *fp) | |
204 | { | |
3e15c67c | 205 | int i; |
8f3f9b09 JH |
206 | for (i = 0; i < num_pack; i++) |
207 | fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6); | |
21b1aced | 208 | fputc('\n', fp); |
8f3f9b09 JH |
209 | } |
210 | ||
211 | static int update_info_packs(int force) | |
212 | { | |
213 | char infofile[PATH_MAX]; | |
214 | char name[PATH_MAX]; | |
215 | int namelen; | |
216 | FILE *fp; | |
217 | ||
218 | namelen = sprintf(infofile, "%s/info/packs", get_object_directory()); | |
219 | strcpy(name, infofile); | |
220 | strcpy(name + namelen, "+"); | |
221 | ||
222 | init_pack_info(infofile, force); | |
8f3f9b09 JH |
223 | |
224 | safe_create_leading_directories(name); | |
225 | fp = fopen(name, "w"); | |
226 | if (!fp) | |
227 | return error("cannot open %s", name); | |
228 | write_pack_info_file(fp); | |
229 | fclose(fp); | |
230 | rename(name, infofile); | |
231 | return 0; | |
232 | } | |
233 | ||
8f3f9b09 JH |
234 | /* public */ |
235 | int update_server_info(int force) | |
236 | { | |
237 | /* We would add more dumb-server support files later, | |
238 | * including index of available pack files and their | |
239 | * intended audiences. | |
240 | */ | |
241 | int errs = 0; | |
242 | ||
243 | errs = errs | update_info_refs(force); | |
244 | errs = errs | update_info_packs(force); | |
8f3f9b09 | 245 | |
6f42f89c JH |
246 | /* remove leftover rev-cache file if there is any */ |
247 | unlink(git_path("info/rev-cache")); | |
248 | ||
8f3f9b09 JH |
249 | return errs; |
250 | } |