1123b6b7e4312a9ab47071479d071a5856fc8134
1 #include "cache.h"
3 #include <sys/types.h>
4 #include <dirent.h>
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 }
16 static int mark_sha1_seen(unsigned char *sha1, char *tag)
17 {
18 return 0;
19 }
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 unsigned int mode;
28 if (size < len + 20 || !path || sscanf(data, "%o", &mode) != 1)
29 return -1;
30 data += len + 20;
31 size -= len + 20;
32 mark_needs_sha1(sha1, S_ISDIR(mode) ? "tree" : "blob", file_sha1);
33 }
34 return 0;
35 }
37 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
38 {
39 int parents;
40 unsigned char tree_sha1[20];
41 unsigned char parent_sha1[20];
43 if (memcmp(data, "tree ", 5))
44 return -1;
45 if (get_sha1_hex(data + 5, tree_sha1) < 0)
46 return -1;
47 mark_needs_sha1(sha1, "tree", tree_sha1);
48 data += 5 + 40 + 1; /* "tree " + <hex sha1> + '\n' */
49 parents = 0;
50 while (!memcmp(data, "parent ", 7)) {
51 if (get_sha1_hex(data + 7, parent_sha1) < 0)
52 return -1;
53 mark_needs_sha1(sha1, "commit", parent_sha1);
54 data += 7 + 40 + 1; /* "parent " + <hex sha1> + '\n' */
55 parents++;
56 }
57 if (!parents)
58 printf("root: %s\n", sha1_to_hex(sha1));
59 return 0;
60 }
62 static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
63 {
64 if (!strcmp(tag, "blob")) {
65 /* Nothing to check */;
66 } else if (!strcmp(tag, "tree")) {
67 if (fsck_tree(sha1, data, size) < 0)
68 return -1;
69 } else if (!strcmp(tag, "commit")) {
70 if (fsck_commit(sha1, data, size) < 0)
71 return -1;
72 } else
73 return -1;
74 return mark_sha1_seen(sha1, tag);
75 }
77 static int fsck_name(char *hex)
78 {
79 unsigned char sha1[20];
80 if (!get_sha1_hex(hex, sha1)) {
81 unsigned long mapsize;
82 void *map = map_sha1_file(sha1, &mapsize);
83 if (map) {
84 char type[100];
85 unsigned long size;
86 void *buffer = NULL;
87 if (!check_sha1_signature(sha1, map, mapsize))
88 buffer = unpack_sha1_file(map, mapsize, type, &size);
89 munmap(map, mapsize);
90 if (buffer && !fsck_entry(sha1, type, buffer, size))
91 return 0;
92 }
93 }
94 return -1;
95 }
97 static int fsck_dir(int i, char *path)
98 {
99 DIR *dir = opendir(path);
100 struct dirent *de;
102 if (!dir) {
103 fprintf(stderr, "missing sha1 directory '%s'", path);
104 return -1;
105 }
107 while ((de = readdir(dir)) != NULL) {
108 char name[100];
109 int len = strlen(de->d_name);
111 switch (len) {
112 case 2:
113 if (de->d_name[1] != '.')
114 break;
115 case 1:
116 if (de->d_name[0] != '.')
117 break;
118 continue;
119 case 38:
120 sprintf(name, "%02x", i);
121 memcpy(name+2, de->d_name, len+1);
122 if (!fsck_name(name))
123 continue;
124 }
125 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
126 }
127 closedir(dir);
128 return 0;
129 }
131 int main(int argc, char **argv)
132 {
133 int i;
134 char *sha1_dir;
136 if (argc != 1)
137 usage("fsck-cache");
138 sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
139 for (i = 0; i < 256; i++) {
140 static char dir[4096];
141 sprintf(dir, "%s/%02x", sha1_dir, i);
142 fsck_dir(i, dir);
143 }
144 return 0;
145 }