server-info: simplify cleanup in parse_pack_def()
[git/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
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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
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 */
b83a3089 115static int parse_pack_def(const char *packname, int old_cnt)
8f3f9b09 116{
b83a3089 117 struct pack_info *i = find_pack_by_name(packname);
8f3f9b09
JH
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;
965cc517 136 int stale = 1;
8f3f9b09 137
e9d983f1 138 fp = fopen_or_warn(infofile, "r");
8f3f9b09 139 if (!fp)
addf88e4 140 return 1; /* nonexistent is not an error. */
8f3f9b09
JH
141
142 while (fgets(line, sizeof(line), fp)) {
b83a3089 143 const char *arg;
8f3f9b09 144 int len = strlen(line);
872c930d 145 if (len && line[len-1] == '\n')
8ac4838a
JH
146 line[--len] = 0;
147
148 if (!len)
149 continue;
8f3f9b09 150
b83a3089
JK
151 if (skip_prefix(line, "P ", &arg)) {
152 /* P name */
153 if (parse_pack_def(arg, old_cnt++))
8f3f9b09 154 goto out_stale;
b83a3089
JK
155 } else if (line[0] == 'D') {
156 /* we used to emit D but that was misguided. */
3e15c67c 157 goto out_stale;
b83a3089
JK
158 } else if (line[0] == 'T') {
159 /* we used to emit T but nobody uses it. */
160 goto out_stale;
161 } else {
8f3f9b09 162 error("unrecognized: %s", line);
8f3f9b09
JH
163 }
164 }
965cc517
JK
165 stale = 0;
166
8f3f9b09
JH
167 out_stale:
168 fclose(fp);
965cc517 169 return stale;
8f3f9b09
JH
170}
171
8f3f9b09
JH
172static int compare_info(const void *a_, const void *b_)
173{
4b25d091
FC
174 struct pack_info *const *a = a_;
175 struct pack_info *const *b = b_;
8f3f9b09
JH
176
177 if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
178 /* Keep the order in the original */
179 return (*a)->old_num - (*b)->old_num;
180 else if (0 <= (*a)->old_num)
181 /* Only A existed in the original so B is obviously newer */
182 return -1;
183 else if (0 <= (*b)->old_num)
184 /* The other way around. */
185 return 1;
186
d5eac498 187 /* then it does not matter but at least keep the comparison stable */
2dee5816
JH
188 if ((*a)->p == (*b)->p)
189 return 0;
190 else if ((*a)->p < (*b)->p)
191 return -1;
192 else
193 return 1;
8f3f9b09
JH
194}
195
196static void init_pack_info(const char *infofile, int force)
197{
198 struct packed_git *p;
199 int stale;
200 int i = 0;
8f3f9b09
JH
201
202 objdir = get_object_directory();
203 objdirlen = strlen(objdir);
204
454ea2e4 205 for (p = get_all_packs(the_repository); p; p = p->next) {
8f3f9b09
JH
206 /* we ignore things on alternate path since they are
207 * not available to the pullers in general.
208 */
f13d7db4 209 if (!p->pack_local)
8f3f9b09
JH
210 continue;
211 i++;
212 }
213 num_pack = i;
214 info = xcalloc(num_pack, sizeof(struct pack_info *));
454ea2e4 215 for (i = 0, p = get_all_packs(the_repository); p; p = p->next) {
f13d7db4 216 if (!p->pack_local)
8f3f9b09 217 continue;
6f42f89c 218 info[i] = xcalloc(1, sizeof(struct pack_info));
8f3f9b09
JH
219 info[i]->p = p;
220 info[i]->old_num = -1;
221 i++;
222 }
223
224 if (infofile && !force)
225 stale = read_pack_info_file(infofile);
226 else
227 stale = 1;
228
910710bb 229 for (i = 0; i < num_pack; i++)
230 if (stale)
8f3f9b09 231 info[i]->old_num = -1;
8f3f9b09 232
6f42f89c 233 /* renumber them */
9ed0d8d6 234 QSORT(info, num_pack, compare_info);
8f3f9b09
JH
235 for (i = 0; i < num_pack; i++)
236 info[i]->new_num = i;
8f3f9b09
JH
237}
238
3907a407
JK
239static void free_pack_info(void)
240{
241 int i;
242 for (i = 0; i < num_pack; i++)
243 free(info[i]);
244 free(info);
245}
246
d38379ec 247static int write_pack_info_file(FILE *fp)
8f3f9b09 248{
3e15c67c 249 int i;
d38379ec
JK
250 for (i = 0; i < num_pack; i++) {
251 if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0)
252 return -1;
253 }
254 if (fputc('\n', fp) == EOF)
255 return -1;
256 return 0;
8f3f9b09
JH
257}
258
259static int update_info_packs(int force)
260{
d38379ec
JK
261 char *infofile = mkpathdup("%s/info/packs", get_object_directory());
262 int ret;
8f3f9b09
JH
263
264 init_pack_info(infofile, force);
d38379ec 265 ret = update_info_file(infofile, write_pack_info_file);
3907a407 266 free_pack_info();
d38379ec
JK
267 free(infofile);
268 return ret;
8f3f9b09
JH
269}
270
8f3f9b09
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271/* public */
272int update_server_info(int force)
273{
274 /* We would add more dumb-server support files later,
275 * including index of available pack files and their
276 * intended audiences.
277 */
278 int errs = 0;
279
280 errs = errs | update_info_refs(force);
281 errs = errs | update_info_packs(force);
8f3f9b09 282
6f42f89c 283 /* remove leftover rev-cache file if there is any */
691f1a28 284 unlink_or_warn(git_path("info/rev-cache"));
6f42f89c 285
8f3f9b09
JH
286 return errs;
287}