Merge branch 'sb/object-store-grafts' into sb/object-store-lookup
[thirdparty/git.git] / server-info.c
CommitLineData
8f3f9b09 1#include "cache.h"
a80d72db 2#include "repository.h"
8f3f9b09
JH
3#include "refs.h"
4#include "object.h"
5#include "commit.h"
b614e3d7 6#include "tag.h"
0abe14f6 7#include "packfile.h"
a80d72db 8#include "object-store.h"
8f3f9b09 9
d38379ec
JK
10/*
11 * Create the file "path" by writing to a temporary file and renaming
12 * it into place. The contents of the file come from "generate", which
13 * should return non-zero if it encounters an error.
14 */
15static int update_info_file(char *path, int (*generate)(FILE *))
16{
17 char *tmp = mkpathdup("%s_XXXXXX", path);
18 int ret = -1;
19 int fd = -1;
fa1912c8 20 FILE *fp = NULL, *to_close;
d38379ec
JK
21
22 safe_create_leading_directories(path);
d91175b2 23 fd = git_mkstemp_mode(tmp, 0666);
d38379ec
JK
24 if (fd < 0)
25 goto out;
fa1912c8 26 to_close = fp = fdopen(fd, "w");
d38379ec
JK
27 if (!fp)
28 goto out;
fa1912c8 29 fd = -1;
d38379ec
JK
30 ret = generate(fp);
31 if (ret)
32 goto out;
fa1912c8
RS
33 fp = NULL;
34 if (fclose(to_close))
d38379ec
JK
35 goto out;
36 if (adjust_shared_perm(tmp) < 0)
37 goto out;
38 if (rename(tmp, path) < 0)
39 goto out;
40 ret = 0;
41
42out:
43 if (ret) {
02382f51 44 error_errno("unable to update %s", path);
d38379ec
JK
45 if (fp)
46 fclose(fp);
47 else if (fd >= 0)
48 close(fd);
49 unlink(tmp);
50 }
51 free(tmp);
52 return ret;
53}
8f3f9b09 54
e2b0bcdf
MH
55static int add_info_ref(const char *path, const struct object_id *oid,
56 int flag, void *cb_data)
8f3f9b09 57{
d38379ec 58 FILE *fp = cb_data;
c251c83d 59 struct object *o = parse_object(oid);
76f8a302
SP
60 if (!o)
61 return -1;
f6b42a81 62
e2b0bcdf 63 if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0)
d38379ec
JK
64 return -1;
65
1974632c 66 if (o->type == OBJ_TAG) {
9534f40b
JH
67 o = deref_tag(o, path, 0);
68 if (o)
d38379ec 69 if (fprintf(fp, "%s %s^{}\n",
f2fd0760 70 oid_to_hex(&o->oid), path) < 0)
d38379ec 71 return -1;
f6b42a81 72 }
8f3f9b09
JH
73 return 0;
74}
75
d38379ec
JK
76static int generate_info_refs(FILE *fp)
77{
e2b0bcdf 78 return for_each_ref(add_info_ref, fp);
d38379ec
JK
79}
80
8f3f9b09
JH
81static int update_info_refs(int force)
82{
d38379ec
JK
83 char *path = git_pathdup("info/refs");
84 int ret = update_info_file(path, generate_info_refs);
85 free(path);
86 return ret;
8f3f9b09
JH
87}
88
89/* packs */
4d8fa916 90static struct pack_info {
8f3f9b09
JH
91 struct packed_git *p;
92 int old_num;
93 int new_num;
94 int nr_alloc;
8f3f9b09
JH
95} **info;
96static int num_pack;
97static const char *objdir;
98static int objdirlen;
99
8f3f9b09
JH
100static 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 */
115static 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 */
131static 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
169static 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
193static 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
a80d72db 202 for (p = get_packed_git(the_repository); p; p = p->next) {
8f3f9b09
JH
203 /* we ignore things on alternate path since they are
204 * not available to the pullers in general.
205 */
f13d7db4 206 if (!p->pack_local)
8f3f9b09
JH
207 continue;
208 i++;
209 }
210 num_pack = i;
211 info = xcalloc(num_pack, sizeof(struct pack_info *));
a80d72db 212 for (i = 0, p = get_packed_git(the_repository); p; p = p->next) {
f13d7db4 213 if (!p->pack_local)
8f3f9b09 214 continue;
6f42f89c 215 info[i] = xcalloc(1, sizeof(struct pack_info));
8f3f9b09
JH
216 info[i]->p = p;
217 info[i]->old_num = -1;
218 i++;
219 }
220
221 if (infofile && !force)
222 stale = read_pack_info_file(infofile);
223 else
224 stale = 1;
225
910710bb 226 for (i = 0; i < num_pack; i++)
227 if (stale)
8f3f9b09 228 info[i]->old_num = -1;
8f3f9b09 229
6f42f89c 230 /* renumber them */
9ed0d8d6 231 QSORT(info, num_pack, compare_info);
8f3f9b09
JH
232 for (i = 0; i < num_pack; i++)
233 info[i]->new_num = i;
8f3f9b09
JH
234}
235
3907a407
JK
236static void free_pack_info(void)
237{
238 int i;
239 for (i = 0; i < num_pack; i++)
240 free(info[i]);
241 free(info);
242}
243
d38379ec 244static int write_pack_info_file(FILE *fp)
8f3f9b09 245{
3e15c67c 246 int i;
d38379ec
JK
247 for (i = 0; i < num_pack; i++) {
248 if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0)
249 return -1;
250 }
251 if (fputc('\n', fp) == EOF)
252 return -1;
253 return 0;
8f3f9b09
JH
254}
255
256static int update_info_packs(int force)
257{
d38379ec
JK
258 char *infofile = mkpathdup("%s/info/packs", get_object_directory());
259 int ret;
8f3f9b09
JH
260
261 init_pack_info(infofile, force);
d38379ec 262 ret = update_info_file(infofile, write_pack_info_file);
3907a407 263 free_pack_info();
d38379ec
JK
264 free(infofile);
265 return ret;
8f3f9b09
JH
266}
267
8f3f9b09
JH
268/* public */
269int update_server_info(int force)
270{
271 /* We would add more dumb-server support files later,
272 * including index of available pack files and their
273 * intended audiences.
274 */
275 int errs = 0;
276
277 errs = errs | update_info_refs(force);
278 errs = errs | update_info_packs(force);
8f3f9b09 279
6f42f89c 280 /* remove leftover rev-cache file if there is any */
691f1a28 281 unlink_or_warn(git_path("info/rev-cache"));
6f42f89c 282
8f3f9b09
JH
283 return errs;
284}