Make fsck-cache start parsing the object types, and checking their
[git/git.git] / fsck-cache.c
1 #include "cache.h"
2
3 #include <sys/types.h>
4 #include <dirent.h>
5
6 /*
7 * These two functions should build up a graph in memory about
8 * what objects we've referenced, and found, and types..
9 *
10 * Right now we don't do that kind of reachability checking. Yet.
11 */
12 static void mark_needs_sha1(unsigned char *parent, const char * type, unsigned char *child)
13 {
14 }
15
16 static int mark_sha1_seen(unsigned char *sha1, char *tag)
17 {
18 return 0;
19 }
20
21 static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
22 {
23 while (size) {
24 int len = 1+strlen(data);
25 unsigned char *file_sha1 = data + len;
26 char *path = strchr(data, ' ');
27 if (size < len + 20 || !path)
28 return -1;
29 data += len + 20;
30 size -= len + 20;
31 mark_needs_sha1(sha1, "blob", file_sha1);
32 }
33 }
34
35 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
36 {
37 unsigned char tree_sha1[20];
38 unsigned char parent_sha1[20];
39
40 if (memcmp(data, "tree ", 5))
41 return -1;
42 if (get_sha1_hex(data + 5, tree_sha1) < 0)
43 return -1;
44 mark_needs_sha1(sha1, "tree", tree_sha1);
45 data += 5 + 40 + 1; /* "tree " + <hex sha1> + '\n' */
46 while (!memcmp(data, "parent ", 7)) {
47 if (get_sha1_hex(data + 7, parent_sha1) < 0)
48 return -1;
49 mark_needs_sha1(sha1, "commit", parent_sha1);
50 data += 7 + 40 + 1; /* "parent " + <hex sha1> + '\n' */
51 }
52 }
53
54 static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
55 {
56 if (!strcmp(tag, "blob")) {
57 /* Nothing to check */;
58 } else if (!strcmp(tag, "tree")) {
59 if (fsck_tree(sha1, data, size) < 0)
60 return -1;
61 } else if (!strcmp(tag, "commit")) {
62 if (fsck_commit(sha1, data, size) < 0)
63 return -1;
64 } else
65 return -1;
66 return mark_sha1_seen(sha1, tag);
67 }
68
69 static int fsck_name(char *hex)
70 {
71 unsigned char sha1[20];
72 if (!get_sha1_hex(hex, sha1)) {
73 unsigned long mapsize;
74 void *map = map_sha1_file(sha1, &mapsize);
75 if (map) {
76 char type[100];
77 unsigned long size;
78 void *buffer = NULL;
79 if (!check_sha1_signature(sha1, map, mapsize))
80 buffer = unpack_sha1_file(map, mapsize, type, &size);
81 munmap(map, mapsize);
82 if (buffer && !fsck_entry(sha1, type, buffer, size))
83 return 0;
84 }
85 }
86 return -1;
87 }
88
89 static int fsck_dir(int i, char *path)
90 {
91 DIR *dir = opendir(path);
92 struct dirent *de;
93
94 if (!dir) {
95 fprintf(stderr, "missing sha1 directory '%s'", path);
96 return -1;
97 }
98
99 while ((de = readdir(dir)) != NULL) {
100 char name[100];
101 int len = strlen(de->d_name);
102
103 switch (len) {
104 case 2:
105 if (de->d_name[1] != '.')
106 break;
107 case 1:
108 if (de->d_name[0] != '.')
109 break;
110 continue;
111 case 38:
112 sprintf(name, "%02x", i);
113 memcpy(name+2, de->d_name, len+1);
114 if (!fsck_name(name))
115 continue;
116 }
117 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
118 }
119 closedir(dir);
120 return 0;
121 }
122
123 int main(int argc, char **argv)
124 {
125 int i;
126 char *sha1_dir;
127
128 if (argc != 1)
129 usage("fsck-cache");
130 sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
131 for (i = 0; i < 256; i++) {
132 static char dir[4096];
133 sprintf(dir, "%s/%02x", sha1_dir, i);
134 fsck_dir(i, dir);
135 }
136 return 0;
137 }