Git 2.22-rc0
[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
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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
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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;
109cd76d 59 struct object *o = parse_object(the_repository, 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) {
a74093da 67 o = deref_tag(the_repository, o, path, 0);
9534f40b 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
b3223761 81static int update_info_refs(void)
8f3f9b09 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;
8f3f9b09
JH
94} **info;
95static int num_pack;
8f3f9b09 96
8f3f9b09
JH
97static struct pack_info *find_pack_by_name(const char *name)
98{
99 int i;
100 for (i = 0; i < num_pack; i++) {
101 struct packed_git *p = info[i]->p;
b9fb142e 102 if (!strcmp(pack_basename(p), name))
8f3f9b09
JH
103 return info[i];
104 }
105 return NULL;
106}
107
8f3f9b09
JH
108/* Returns non-zero when we detect that the info in the
109 * old file is useless.
110 */
b83a3089 111static int parse_pack_def(const char *packname, int old_cnt)
8f3f9b09 112{
b83a3089 113 struct pack_info *i = find_pack_by_name(packname);
8f3f9b09
JH
114 if (i) {
115 i->old_num = old_cnt;
116 return 0;
117 }
118 else {
6f42f89c 119 /* The file describes a pack that is no longer here */
8f3f9b09
JH
120 return 1;
121 }
122}
123
8f3f9b09
JH
124/* Returns non-zero when we detect that the info in the
125 * old file is useless.
126 */
127static int read_pack_info_file(const char *infofile)
128{
129 FILE *fp;
4ecbd649 130 struct strbuf line = STRBUF_INIT;
8f3f9b09 131 int old_cnt = 0;
965cc517 132 int stale = 1;
8f3f9b09 133
e9d983f1 134 fp = fopen_or_warn(infofile, "r");
8f3f9b09 135 if (!fp)
addf88e4 136 return 1; /* nonexistent is not an error. */
8f3f9b09 137
4ecbd649 138 while (strbuf_getline(&line, fp) != EOF) {
b83a3089 139 const char *arg;
8ac4838a 140
4ecbd649 141 if (!line.len)
8ac4838a 142 continue;
8f3f9b09 143
4ecbd649 144 if (skip_prefix(line.buf, "P ", &arg)) {
b83a3089
JK
145 /* P name */
146 if (parse_pack_def(arg, old_cnt++))
8f3f9b09 147 goto out_stale;
4ecbd649 148 } else if (line.buf[0] == 'D') {
b83a3089 149 /* we used to emit D but that was misguided. */
3e15c67c 150 goto out_stale;
4ecbd649 151 } else if (line.buf[0] == 'T') {
b83a3089
JK
152 /* we used to emit T but nobody uses it. */
153 goto out_stale;
154 } else {
4ecbd649 155 error("unrecognized: %s", line.buf);
8f3f9b09
JH
156 }
157 }
965cc517
JK
158 stale = 0;
159
8f3f9b09 160 out_stale:
4ecbd649 161 strbuf_release(&line);
8f3f9b09 162 fclose(fp);
965cc517 163 return stale;
8f3f9b09
JH
164}
165
8f3f9b09
JH
166static int compare_info(const void *a_, const void *b_)
167{
4b25d091
FC
168 struct pack_info *const *a = a_;
169 struct pack_info *const *b = b_;
8f3f9b09
JH
170
171 if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
172 /* Keep the order in the original */
173 return (*a)->old_num - (*b)->old_num;
174 else if (0 <= (*a)->old_num)
175 /* Only A existed in the original so B is obviously newer */
176 return -1;
177 else if (0 <= (*b)->old_num)
178 /* The other way around. */
179 return 1;
180
d5eac498 181 /* then it does not matter but at least keep the comparison stable */
2dee5816
JH
182 if ((*a)->p == (*b)->p)
183 return 0;
184 else if ((*a)->p < (*b)->p)
185 return -1;
186 else
187 return 1;
8f3f9b09
JH
188}
189
190static void init_pack_info(const char *infofile, int force)
191{
192 struct packed_git *p;
193 int stale;
194 int i = 0;
8f3f9b09 195
454ea2e4 196 for (p = get_all_packs(the_repository); p; p = p->next) {
8f3f9b09
JH
197 /* we ignore things on alternate path since they are
198 * not available to the pullers in general.
199 */
f13d7db4 200 if (!p->pack_local)
8f3f9b09
JH
201 continue;
202 i++;
203 }
204 num_pack = i;
205 info = xcalloc(num_pack, sizeof(struct pack_info *));
454ea2e4 206 for (i = 0, p = get_all_packs(the_repository); p; p = p->next) {
f13d7db4 207 if (!p->pack_local)
8f3f9b09 208 continue;
79bb8b3c 209 assert(i < num_pack);
6f42f89c 210 info[i] = xcalloc(1, sizeof(struct pack_info));
8f3f9b09
JH
211 info[i]->p = p;
212 info[i]->old_num = -1;
213 i++;
214 }
215
216 if (infofile && !force)
217 stale = read_pack_info_file(infofile);
218 else
219 stale = 1;
220
910710bb 221 for (i = 0; i < num_pack; i++)
222 if (stale)
8f3f9b09 223 info[i]->old_num = -1;
8f3f9b09 224
6f42f89c 225 /* renumber them */
9ed0d8d6 226 QSORT(info, num_pack, compare_info);
8f3f9b09
JH
227 for (i = 0; i < num_pack; i++)
228 info[i]->new_num = i;
8f3f9b09
JH
229}
230
3907a407
JK
231static void free_pack_info(void)
232{
233 int i;
234 for (i = 0; i < num_pack; i++)
235 free(info[i]);
236 free(info);
237}
238
d38379ec 239static int write_pack_info_file(FILE *fp)
8f3f9b09 240{
3e15c67c 241 int i;
d38379ec 242 for (i = 0; i < num_pack; i++) {
b9fb142e 243 if (fprintf(fp, "P %s\n", pack_basename(info[i]->p)) < 0)
d38379ec
JK
244 return -1;
245 }
246 if (fputc('\n', fp) == EOF)
247 return -1;
248 return 0;
8f3f9b09
JH
249}
250
251static int update_info_packs(int force)
252{
d38379ec
JK
253 char *infofile = mkpathdup("%s/info/packs", get_object_directory());
254 int ret;
8f3f9b09
JH
255
256 init_pack_info(infofile, force);
d38379ec 257 ret = update_info_file(infofile, write_pack_info_file);
3907a407 258 free_pack_info();
d38379ec
JK
259 free(infofile);
260 return ret;
8f3f9b09
JH
261}
262
8f3f9b09
JH
263/* public */
264int update_server_info(int force)
265{
266 /* We would add more dumb-server support files later,
267 * including index of available pack files and their
268 * intended audiences.
269 */
270 int errs = 0;
271
b3223761 272 errs = errs | update_info_refs();
8f3f9b09 273 errs = errs | update_info_packs(force);
8f3f9b09 274
6f42f89c 275 /* remove leftover rev-cache file if there is any */
691f1a28 276 unlink_or_warn(git_path("info/rev-cache"));
6f42f89c 277
8f3f9b09
JH
278 return errs;
279}