summaryrefslogtreecommitdiff
path: root/fsck-cache.c
blob: e3c41d48e9fe3e298a8dc3f2b2ecc2a71f6629e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
#include "cache.h"
 
#include <sys/types.h>
#include <dirent.h>
 
#include "commit.h"
#include "tree.h"
#include "blob.h"
 
#define REACHABLE 0x0001
 
static int show_unreachable = 0;
static unsigned char head_sha1[20];
 
static void check_connectivity(void)
{
	int i;
 
	/* Look up all the requirements, warn about missing objects.. */
	for (i = 0; i < nr_objs; i++) {
		struct object *obj = objs[i];
 
		if (show_unreachable && !(obj->flags & REACHABLE)) {
			printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
			continue;
		}
 
		if (!obj->parsed) {
			printf("missing %s %s\n", obj->type, 
			       sha1_to_hex(obj->sha1));
		}
		if (!obj->used) {
			printf("dangling %s %s\n", obj->type, 
			       sha1_to_hex(obj->sha1));
		}
	}
}
 
static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
{
	struct tree *item = lookup_tree(sha1);
	if (parse_tree(item))
		return -1;
	if (item->has_full_path) {
		fprintf(stderr, "warning: fsck-cache: tree %s "
			"has full pathnames in it\n", sha1_to_hex(sha1));
	}
	return 0;
}
 
static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
{
	struct commit *commit = lookup_commit(sha1);
	if (parse_commit(commit))
		return -1;
	if (!commit->tree)
		return -1;
	if (!commit->parents)
		printf("root %s\n", sha1_to_hex(sha1));
	if (!commit->date)
		printf("bad commit date in %s\n", sha1_to_hex(sha1));
	return 0;
}
 
static int fsck_blob(unsigned char *sha1, void *data, unsigned long size)
{
	struct blob *blob = lookup_blob(sha1);
	blob->object.parsed = 1;
	return 0;
}
 
static int fsck_entry(unsigned char *sha1, char *tag, void *data, 
		      unsigned long size)
{
	if (!strcmp(tag, "blob")) {
		if (fsck_blob(sha1, data, size) < 0)
			return -1;
	} else if (!strcmp(tag, "tree")) {
		if (fsck_tree(sha1, data, size) < 0)
			return -1;
	} else if (!strcmp(tag, "commit")) {
		if (fsck_commit(sha1, data, size) < 0)
			return -1;
	} else
		return -1;
	return 0;
}
 
static int fsck_name(char *hex)
{
	unsigned char sha1[20];
	if (!get_sha1_hex(hex, sha1)) {
		unsigned long mapsize;
		void *map = map_sha1_file(sha1, &mapsize);
		if (map) {
			char type[100];
			unsigned long size;
			void *buffer = unpack_sha1_file(map, mapsize, type, &size);
			if (!buffer)
				return -1;
			if (check_sha1_signature(sha1, buffer, size, type) < 0)
				printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
			munmap(map, mapsize);
			if (!fsck_entry(sha1, type, buffer, size))
				return 0;
		}
	}
	return -1;
}
 
static int fsck_dir(int i, char *path)
{
	DIR *dir = opendir(path);
	struct dirent *de;
 
	if (!dir) {
		return error("missing sha1 directory '%s'", path);
	}
 
	while ((de = readdir(dir)) != NULL) {
		char name[100];
		int len = strlen(de->d_name);
 
		switch (len) {
		case 2:
			if (de->d_name[1] != '.')
				break;
		case 1:
			if (de->d_name[0] != '.')
				break;
			continue;
		case 38:
			sprintf(name, "%02x", i);
			memcpy(name+2, de->d_name, len+1);
			if (!fsck_name(name))
				continue;
		}
		fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	}
	closedir(dir);
	return 0;
}
 
int main(int argc, char **argv)
{
	int i, heads;
	char *sha1_dir;
 
	sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
	for (i = 0; i < 256; i++) {
		static char dir[4096];
		sprintf(dir, "%s/%02x", sha1_dir, i);
		fsck_dir(i, dir);
	}
 
	heads = 0;
	for (i = 1; i < argc; i++) {
		if (!strcmp(argv[i], "--unreachable")) {
			show_unreachable = 1;
			continue;
		}
		if (!get_sha1_hex(argv[i], head_sha1)) {
			struct object *obj = &lookup_commit(head_sha1)->object;
			obj->used = 1;
			mark_reachable(obj, REACHABLE);
			heads++;
			continue;
		}
		error("fsck-cache [[--unreachable] <head-sha1>*]");
	}
 
	if (!heads) {
		if (show_unreachable) {
			fprintf(stderr, "unable to do reachability without a head\n");
			show_unreachable = 0; 
		}
		fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
	}
 
	check_connectivity();
	return 0;
}