object-store: free alt_odb_list
[git/git.git] / server-info.c
CommitLineData
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1#include "cache.h"
2#include "refs.h"
3#include "object.h"
4#include "commit.h"
b614e3d7 5#include "tag.h"
0abe14f6 6#include "packfile.h"
8f3f9b09 7
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8/*
9 * Create the file "path" by writing to a temporary file and renaming
10 * it into place. The contents of the file come from "generate", which
11 * should return non-zero if it encounters an error.
12 */
13static int update_info_file(char *path, int (*generate)(FILE *))
14{
15 char *tmp = mkpathdup("%s_XXXXXX", path);
16 int ret = -1;
17 int fd = -1;
fa1912c8 18 FILE *fp = NULL, *to_close;
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19
20 safe_create_leading_directories(path);
d91175b2 21 fd = git_mkstemp_mode(tmp, 0666);
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22 if (fd < 0)
23 goto out;
fa1912c8 24 to_close = fp = fdopen(fd, "w");
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25 if (!fp)
26 goto out;
fa1912c8 27 fd = -1;
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28 ret = generate(fp);
29 if (ret)
30 goto out;
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31 fp = NULL;
32 if (fclose(to_close))
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33 goto out;
34 if (adjust_shared_perm(tmp) < 0)
35 goto out;
36 if (rename(tmp, path) < 0)
37 goto out;
38 ret = 0;
39
40out:
41 if (ret) {
02382f51 42 error_errno("unable to update %s", path);
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43 if (fp)
44 fclose(fp);
45 else if (fd >= 0)
46 close(fd);
47 unlink(tmp);
48 }
49 free(tmp);
50 return ret;
51}
8f3f9b09 52
e2b0bcdf
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53static int add_info_ref(const char *path, const struct object_id *oid,
54 int flag, void *cb_data)
8f3f9b09 55{
d38379ec 56 FILE *fp = cb_data;
c251c83d 57 struct object *o = parse_object(oid);
76f8a302
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58 if (!o)
59 return -1;
f6b42a81 60
e2b0bcdf 61 if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0)
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62 return -1;
63
1974632c 64 if (o->type == OBJ_TAG) {
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65 o = deref_tag(o, path, 0);
66 if (o)
d38379ec 67 if (fprintf(fp, "%s %s^{}\n",
f2fd0760 68 oid_to_hex(&o->oid), path) < 0)
d38379ec 69 return -1;
f6b42a81 70 }
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71 return 0;
72}
73
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74static int generate_info_refs(FILE *fp)
75{
e2b0bcdf 76 return for_each_ref(add_info_ref, fp);
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77}
78
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79static int update_info_refs(int force)
80{
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81 char *path = git_pathdup("info/refs");
82 int ret = update_info_file(path, generate_info_refs);
83 free(path);
84 return ret;
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85}
86
87/* packs */
4d8fa916 88static struct pack_info {
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89 struct packed_git *p;
90 int old_num;
91 int new_num;
92 int nr_alloc;
93 int nr_heads;
94 unsigned char (*head)[20];
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95} **info;
96static int num_pack;
97static const char *objdir;
98static int objdirlen;
99
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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
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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 */
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124 return 1;
125 }
126}
127
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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. */
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140
141 while (fgets(line, sizeof(line), fp)) {
142 int len = strlen(line);
872c930d 143 if (len && line[len-1] == '\n')
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144 line[--len] = 0;
145
146 if (!len)
147 continue;
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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. */
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155 case 'T': /* we used to emit T but nobody uses it. */
156 goto out_stale;
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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
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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_;
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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
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185 if ((*a)->p == (*b)->p)
186 return 0;
187 else if ((*a)->p < (*b)->p)
188 return -1;
189 else
190 return 1;
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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;
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198
199 objdir = get_object_directory();
200 objdirlen = strlen(objdir);
201
202 prepare_packed_git();
203 for (p = packed_git; p; p = p->next) {
204 /* we ignore things on alternate path since they are
205 * not available to the pullers in general.
206 */
f13d7db4 207 if (!p->pack_local)
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208 continue;
209 i++;
210 }
211 num_pack = i;
212 info = xcalloc(num_pack, sizeof(struct pack_info *));
213 for (i = 0, p = packed_git; p; p = p->next) {
f13d7db4 214 if (!p->pack_local)
8f3f9b09 215 continue;
6f42f89c 216 info[i] = xcalloc(1, sizeof(struct pack_info));
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217 info[i]->p = p;
218 info[i]->old_num = -1;
219 i++;
220 }
221
222 if (infofile && !force)
223 stale = read_pack_info_file(infofile);
224 else
225 stale = 1;
226
227 for (i = 0; i < num_pack; i++) {
228 if (stale) {
229 info[i]->old_num = -1;
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230 info[i]->nr_heads = 0;
231 }
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232 }
233
6f42f89c 234 /* renumber them */
9ed0d8d6 235 QSORT(info, num_pack, compare_info);
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236 for (i = 0; i < num_pack; i++)
237 info[i]->new_num = i;
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238}
239
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240static void free_pack_info(void)
241{
242 int i;
243 for (i = 0; i < num_pack; i++)
244 free(info[i]);
245 free(info);
246}
247
d38379ec 248static int write_pack_info_file(FILE *fp)
8f3f9b09 249{
3e15c67c 250 int i;
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251 for (i = 0; i < num_pack; i++) {
252 if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0)
253 return -1;
254 }
255 if (fputc('\n', fp) == EOF)
256 return -1;
257 return 0;
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258}
259
260static int update_info_packs(int force)
261{
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262 char *infofile = mkpathdup("%s/info/packs", get_object_directory());
263 int ret;
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264
265 init_pack_info(infofile, force);
d38379ec 266 ret = update_info_file(infofile, write_pack_info_file);
3907a407 267 free_pack_info();
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268 free(infofile);
269 return ret;
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270}
271
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272/* public */
273int update_server_info(int force)
274{
275 /* We would add more dumb-server support files later,
276 * including index of available pack files and their
277 * intended audiences.
278 */
279 int errs = 0;
280
281 errs = errs | update_info_refs(force);
282 errs = errs | update_info_packs(force);
8f3f9b09 283
6f42f89c 284 /* remove leftover rev-cache file if there is any */
691f1a28 285 unlink_or_warn(git_path("info/rev-cache"));
6f42f89c 286
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287 return errs;
288}