prune-packed: fix minor memory leak
[thirdparty/git.git] / server-info.c
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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"
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6
7/* refs */
8static FILE *info_ref_fp;
8f3f9b09 9
8da19775 10static 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);
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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) {
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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 }
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23 return 0;
24}
25
26static int update_info_refs(int force)
27{
a4f34cbb 28 char *path0 = git_pathdup("info/refs");
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29 int len = strlen(path0);
30 char *path1 = xmalloc(len + 2);
31
32 strcpy(path1, path0);
33 strcpy(path1 + len, "+");
34
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35 safe_create_leading_directories(path0);
36 info_ref_fp = fopen(path1, "w");
37 if (!info_ref_fp)
84ef0338 38 return error("unable to update %s", path1);
cb5d709f 39 for_each_ref(add_info_ref, NULL);
8f3f9b09 40 fclose(info_ref_fp);
83525227 41 adjust_shared_perm(path1);
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42 rename(path1, path0);
43 free(path0);
44 free(path1);
45 return 0;
46}
47
48/* packs */
4d8fa916 49static struct pack_info {
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50 struct packed_git *p;
51 int old_num;
52 int new_num;
53 int nr_alloc;
54 int nr_heads;
55 unsigned char (*head)[20];
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56} **info;
57static int num_pack;
58static const char *objdir;
59static int objdirlen;
60
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61static struct pack_info *find_pack_by_name(const char *name)
62{
63 int i;
64 for (i = 0; i < num_pack; i++) {
65 struct packed_git *p = info[i]->p;
66 /* skip "/pack/" after ".git/objects" */
67 if (!strcmp(p->pack_name + objdirlen + 6, name))
68 return info[i];
69 }
70 return NULL;
71}
72
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73/* Returns non-zero when we detect that the info in the
74 * old file is useless.
75 */
76static int parse_pack_def(const char *line, int old_cnt)
77{
78 struct pack_info *i = find_pack_by_name(line + 2);
79 if (i) {
80 i->old_num = old_cnt;
81 return 0;
82 }
83 else {
6f42f89c 84 /* The file describes a pack that is no longer here */
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85 return 1;
86 }
87}
88
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89/* Returns non-zero when we detect that the info in the
90 * old file is useless.
91 */
92static int read_pack_info_file(const char *infofile)
93{
94 FILE *fp;
95 char line[1000];
96 int old_cnt = 0;
97
98 fp = fopen(infofile, "r");
99 if (!fp)
addf88e4 100 return 1; /* nonexistent is not an error. */
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101
102 while (fgets(line, sizeof(line), fp)) {
103 int len = strlen(line);
872c930d 104 if (len && line[len-1] == '\n')
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105 line[--len] = 0;
106
107 if (!len)
108 continue;
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109
110 switch (line[0]) {
111 case 'P': /* P name */
112 if (parse_pack_def(line, old_cnt++))
113 goto out_stale;
114 break;
6f42f89c 115 case 'D': /* we used to emit D but that was misguided. */
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116 case 'T': /* we used to emit T but nobody uses it. */
117 goto out_stale;
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118 default:
119 error("unrecognized: %s", line);
120 break;
121 }
122 }
123 fclose(fp);
124 return 0;
125 out_stale:
126 fclose(fp);
127 return 1;
128}
129
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130static int compare_info(const void *a_, const void *b_)
131{
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132 struct pack_info *const *a = a_;
133 struct pack_info *const *b = b_;
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134
135 if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
136 /* Keep the order in the original */
137 return (*a)->old_num - (*b)->old_num;
138 else if (0 <= (*a)->old_num)
139 /* Only A existed in the original so B is obviously newer */
140 return -1;
141 else if (0 <= (*b)->old_num)
142 /* The other way around. */
143 return 1;
144
d5eac498 145 /* then it does not matter but at least keep the comparison stable */
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146 if ((*a)->p == (*b)->p)
147 return 0;
148 else if ((*a)->p < (*b)->p)
149 return -1;
150 else
151 return 1;
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152}
153
154static void init_pack_info(const char *infofile, int force)
155{
156 struct packed_git *p;
157 int stale;
158 int i = 0;
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159
160 objdir = get_object_directory();
161 objdirlen = strlen(objdir);
162
163 prepare_packed_git();
164 for (p = packed_git; p; p = p->next) {
165 /* we ignore things on alternate path since they are
166 * not available to the pullers in general.
167 */
f13d7db4 168 if (!p->pack_local)
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169 continue;
170 i++;
171 }
172 num_pack = i;
173 info = xcalloc(num_pack, sizeof(struct pack_info *));
174 for (i = 0, p = packed_git; p; p = p->next) {
f13d7db4 175 if (!p->pack_local)
8f3f9b09 176 continue;
6f42f89c 177 info[i] = xcalloc(1, sizeof(struct pack_info));
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178 info[i]->p = p;
179 info[i]->old_num = -1;
180 i++;
181 }
182
183 if (infofile && !force)
184 stale = read_pack_info_file(infofile);
185 else
186 stale = 1;
187
188 for (i = 0; i < num_pack; i++) {
189 if (stale) {
190 info[i]->old_num = -1;
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191 info[i]->nr_heads = 0;
192 }
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193 }
194
6f42f89c 195 /* renumber them */
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196 qsort(info, num_pack, sizeof(info[0]), compare_info);
197 for (i = 0; i < num_pack; i++)
198 info[i]->new_num = i;
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199}
200
201static void write_pack_info_file(FILE *fp)
202{
3e15c67c 203 int i;
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204 for (i = 0; i < num_pack; i++)
205 fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6);
21b1aced 206 fputc('\n', fp);
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207}
208
209static int update_info_packs(int force)
210{
211 char infofile[PATH_MAX];
212 char name[PATH_MAX];
213 int namelen;
214 FILE *fp;
215
216 namelen = sprintf(infofile, "%s/info/packs", get_object_directory());
217 strcpy(name, infofile);
218 strcpy(name + namelen, "+");
219
220 init_pack_info(infofile, force);
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221
222 safe_create_leading_directories(name);
223 fp = fopen(name, "w");
224 if (!fp)
225 return error("cannot open %s", name);
226 write_pack_info_file(fp);
227 fclose(fp);
83525227 228 adjust_shared_perm(name);
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229 rename(name, infofile);
230 return 0;
231}
232
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233/* public */
234int update_server_info(int force)
235{
236 /* We would add more dumb-server support files later,
237 * including index of available pack files and their
238 * intended audiences.
239 */
240 int errs = 0;
241
242 errs = errs | update_info_refs(force);
243 errs = errs | update_info_packs(force);
8f3f9b09 244
6f42f89c 245 /* remove leftover rev-cache file if there is any */
691f1a28 246 unlink_or_warn(git_path("info/rev-cache"));
6f42f89c 247
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248 return errs;
249}