Fix missing return values and some error tests for empty index files
[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 return 0;
34 }
35
36 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
37 {
38 unsigned char tree_sha1[20];
39 unsigned char parent_sha1[20];
40
41 if (memcmp(data, "tree ", 5))
42 return -1;
43 if (get_sha1_hex(data + 5, tree_sha1) < 0)
44 return -1;
45 mark_needs_sha1(sha1, "tree", tree_sha1);
46 data += 5 + 40 + 1; /* "tree " + <hex sha1> + '\n' */
47 while (!memcmp(data, "parent ", 7)) {
48 if (get_sha1_hex(data + 7, parent_sha1) < 0)
49 return -1;
50 mark_needs_sha1(sha1, "commit", parent_sha1);
51 data += 7 + 40 + 1; /* "parent " + <hex sha1> + '\n' */
52 }
53 return 0;
54 }
55
56 static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
57 {
58 if (!strcmp(tag, "blob")) {
59 /* Nothing to check */;
60 } else if (!strcmp(tag, "tree")) {
61 if (fsck_tree(sha1, data, size) < 0)
62 return -1;
63 } else if (!strcmp(tag, "commit")) {
64 if (fsck_commit(sha1, data, size) < 0)
65 return -1;
66 } else
67 return -1;
68 return mark_sha1_seen(sha1, tag);
69 }
70
71 static int fsck_name(char *hex)
72 {
73 unsigned char sha1[20];
74 if (!get_sha1_hex(hex, sha1)) {
75 unsigned long mapsize;
76 void *map = map_sha1_file(sha1, &mapsize);
77 if (map) {
78 char type[100];
79 unsigned long size;
80 void *buffer = NULL;
81 if (!check_sha1_signature(sha1, map, mapsize))
82 buffer = unpack_sha1_file(map, mapsize, type, &size);
83 munmap(map, mapsize);
84 if (buffer && !fsck_entry(sha1, type, buffer, size))
85 return 0;
86 }
87 }
88 return -1;
89 }
90
91 static int fsck_dir(int i, char *path)
92 {
93 DIR *dir = opendir(path);
94 struct dirent *de;
95
96 if (!dir) {
97 fprintf(stderr, "missing sha1 directory '%s'", path);
98 return -1;
99 }
100
101 while ((de = readdir(dir)) != NULL) {
102 char name[100];
103 int len = strlen(de->d_name);
104
105 switch (len) {
106 case 2:
107 if (de->d_name[1] != '.')
108 break;
109 case 1:
110 if (de->d_name[0] != '.')
111 break;
112 continue;
113 case 38:
114 sprintf(name, "%02x", i);
115 memcpy(name+2, de->d_name, len+1);
116 if (!fsck_name(name))
117 continue;
118 }
119 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
120 }
121 closedir(dir);
122 return 0;
123 }
124
125 int main(int argc, char **argv)
126 {
127 int i;
128 char *sha1_dir;
129
130 if (argc != 1)
131 usage("fsck-cache");
132 sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
133 for (i = 0; i < 256; i++) {
134 static char dir[4096];
135 sprintf(dir, "%s/%02x", sha1_dir, i);
136 fsck_dir(i, dir);
137 }
138 return 0;
139 }