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chromium / external / github.com / git / git / refs/tags/v0.99.9c / . / setup.c
blob: c487d7eb9de70c651ef06a6bfd4a7571337fad84 [file] [log] [blame]
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]1#include "cache.h"
2
Junio C Hamano6b5ee132005-09-21 07:00:47[diff] [blame]3const char *prefix_path(const char *prefix, int len, const char *path)
Linus Torvaldsf3327262005-08-17 03:44:32[diff] [blame]4{
Junio C Hamano6b5ee132005-09-21 07:00:47[diff] [blame]5 const char *orig = path;
Linus Torvaldsf3327262005-08-17 03:44:32[diff] [blame]6 for (;;) {
7 char c;
8 if (*path != '.')
9 break;
10 c = path[1];
11 /* "." */
12 if (!c) {
13 path++;
14 break;
15 }
16 /* "./" */
17 if (c == '/') {
18 path += 2;
19 continue;
20 }
21 if (c != '.')
22 break;
23 c = path[2];
24 if (!c)
25 path += 2;
26 else if (c == '/')
27 path += 3;
28 else
29 break;
30 /* ".." and "../" */
31 /* Remove last component of the prefix */
32 do {
33 if (!len)
34 die("'%s' is outside repository", orig);
35 len--;
36 } while (len && prefix[len-1] != '/');
37 continue;
38 }
39 if (len) {
40 int speclen = strlen(path);
41 char *n = xmalloc(speclen + len + 1);
42
43 memcpy(n, prefix, len);
44 memcpy(n + len, path, speclen+1);
45 path = n;
46 }
47 return path;
48}
49
Junio C Hamano6b5ee132005-09-21 07:00:47[diff] [blame]50const char **get_pathspec(const char *prefix, const char **pathspec)
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]51{
Junio C Hamano6b5ee132005-09-21 07:00:47[diff] [blame]52 const char *entry = *pathspec;
53 const char **p;
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]54 int prefixlen;
55
Linus Torvaldsf3327262005-08-17 03:44:32[diff] [blame]56 if (!prefix && !entry)
57 return NULL;
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]58
59 if (!entry) {
60 static const char *spec[2];
61 spec[0] = prefix;
62 spec[1] = NULL;
63 return spec;
64 }
65
66 /* Otherwise we have to re-write the entries.. */
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]67 p = pathspec;
Linus Torvaldsf3327262005-08-17 03:44:32[diff] [blame]68 prefixlen = prefix ? strlen(prefix) : 0;
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]69 do {
Linus Torvaldsf3327262005-08-17 03:44:32[diff] [blame]70 *p = prefix_path(prefix, prefixlen, entry);
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]71 } while ((entry = *++p) != NULL);
72 return (const char **) pathspec;
73}
74
Linus Torvalds5f5608b2005-08-27 20:54:42[diff] [blame]75/*
76 * Test it it looks like we're at the top
77 * level git directory. We want to see a
78 *
Linus Torvalds5f5608b2005-08-27 20:54:42[diff] [blame]79 * - either a .git/objects/ directory _or_ the proper
80 * GIT_OBJECT_DIRECTORY environment variable
Junio C Hamano8098a172005-09-30 21:26:57[diff] [blame]81 * - a refs/ directory under ".git"
82 * - either a HEAD symlink or a HEAD file that is formatted as
83 * a proper "ref:".
Linus Torvalds5f5608b2005-08-27 20:54:42[diff] [blame]84 */
85static int is_toplevel_directory(void)
86{
Junio C Hamano8098a172005-09-30 21:26:57[diff] [blame]87 if (access(".git/refs/", X_OK) ||
88 access(getenv(DB_ENVIRONMENT) ?
89 getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
90 validate_symref(".git/HEAD"))
91 return 0;
92 return 1;
Linus Torvalds5f5608b2005-08-27 20:54:42[diff] [blame]93}
94
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]95const char *setup_git_directory(void)
96{
97 static char cwd[PATH_MAX+1];
98 int len, offset;
99
100 /*
101 * If GIT_DIR is set explicitly, we're not going
102 * to do any discovery
103 */
Junio C Hamanoa9ab5862005-09-09 21:48:54[diff] [blame]104 if (getenv(GIT_DIR_ENVIRONMENT))
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]105 return NULL;
106
107 if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
108 die("Unable to read current working directory");
109
110 offset = len = strlen(cwd);
111 for (;;) {
Linus Torvalds5f5608b2005-08-27 20:54:42[diff] [blame]112 if (is_toplevel_directory())
113 break;
Linus Torvaldsd288a702005-08-17 01:06:34[diff] [blame]114 chdir("..");
115 do {
116 if (!offset)
117 die("Not a git repository");
118 } while (cwd[--offset] != '/');
119 }
120
121 if (offset == len)
122 return NULL;
123
124 /* Make "offset" point to past the '/', and add a '/' at the end */
125 offset++;
126 cwd[len++] = '/';
127 cwd[len] = 0;
128 return cwd + offset;
129}