[PATCH] Make "git diff" work inside relative subdirectories
[git/git.git] / setup.c
CommitLineData
d288a700
LT
1#include "cache.h"
2
3const char **get_pathspec(const char *prefix, char **pathspec)
4{
5 char *entry = *pathspec;
6 char **p;
7 int prefixlen;
8
9 if (!prefix) {
10 char **p;
11 if (!entry)
12 return NULL;
13 p = pathspec;
14 do {
15 if (*entry != '.')
16 continue;
17 /* fixup ? */
18 } while ((entry = *++p) != NULL);
19 return (const char **) pathspec;
20 }
21
22 if (!entry) {
23 static const char *spec[2];
24 spec[0] = prefix;
25 spec[1] = NULL;
26 return spec;
27 }
28
29 /* Otherwise we have to re-write the entries.. */
30 prefixlen = strlen(prefix);
31 p = pathspec;
32 do {
33 int speclen, len = prefixlen;
34 char *n;
35
36 for (;;) {
37 if (!strcmp(entry, ".")) {
38 entry++;
39 break;
40 }
41 if (!strncmp(entry, "./", 2)) {
42 entry += 2;
43 continue;
44 }
45 if (!strncmp(entry, "../", 3)) {
46 do {
47 if (!len)
48 die("'%s' is outside repository", *p);
49 len--;
50 } while (len && prefix[len-1] != '/');
51 entry += 3;
52 continue;
53 }
54 break;
55 }
56 speclen = strlen(entry);
57 n = xmalloc(speclen + len + 1);
58
59 memcpy(n, prefix, len);
60 memcpy(n + len, entry, speclen+1);
61 *p = n;
62 } while ((entry = *++p) != NULL);
63 return (const char **) pathspec;
64}
65
66const char *setup_git_directory(void)
67{
68 static char cwd[PATH_MAX+1];
69 int len, offset;
70
71 /*
72 * If GIT_DIR is set explicitly, we're not going
73 * to do any discovery
74 */
75 if (gitenv(GIT_DIR_ENVIRONMENT))
76 return NULL;
77
78 if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
79 die("Unable to read current working directory");
80
81 offset = len = strlen(cwd);
82 for (;;) {
83 /*
84 * We always want to see a .git/HEAD and a .git/refs/
85 * subdirectory
86 */
87 if (!access(".git/HEAD", R_OK) && !access(".git/refs/", X_OK)) {
88 /*
89 * Then we need either a GIT_OBJECT_DIRECTORY define
90 * or a .git/objects/ directory
91 */
92 if (gitenv(DB_ENVIRONMENT) || !access(".git/objects/", X_OK))
93 break;
94 }
95 chdir("..");
96 do {
97 if (!offset)
98 die("Not a git repository");
99 } while (cwd[--offset] != '/');
100 }
101
102 if (offset == len)
103 return NULL;
104
105 /* Make "offset" point to past the '/', and add a '/' at the end */
106 offset++;
107 cwd[len++] = '/';
108 cwd[len] = 0;
109 return cwd + offset;
110}