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Commit | Line | Data |
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26c8a533 LT |
1 | /* |
2 | * I'm tired of doing "vsnprintf()" etc just to open a | |
3 | * file, so here's a "return static buffer with printf" | |
4 | * interface for paths. | |
5 | * | |
6 | * It's obviously not thread-safe. Sue me. But it's quite | |
7 | * useful for doing things like | |
8 | * | |
9 | * f = open(mkpath("%s/%s.git", base, name), O_RDONLY); | |
10 | * | |
11 | * which is what it's designed for. | |
12 | */ | |
13 | #include "cache.h" | |
54f4b874 | 14 | #include <pwd.h> |
26c8a533 LT |
15 | |
16 | static char pathname[PATH_MAX]; | |
17 | static char bad_path[] = "/bad-path/"; | |
18 | ||
19 | static char *cleanup_path(char *path) | |
20 | { | |
21 | /* Clean it up */ | |
22 | if (!memcmp(path, "./", 2)) { | |
23 | path += 2; | |
24 | while (*path == '/') | |
25 | path++; | |
26 | } | |
27 | return path; | |
28 | } | |
29 | ||
30 | char *mkpath(const char *fmt, ...) | |
31 | { | |
32 | va_list args; | |
33 | unsigned len; | |
34 | ||
35 | va_start(args, fmt); | |
36 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
37 | va_end(args); | |
38 | if (len >= PATH_MAX) | |
39 | return bad_path; | |
40 | return cleanup_path(pathname); | |
41 | } | |
42 | ||
43 | char *git_path(const char *fmt, ...) | |
44 | { | |
5da1606d | 45 | const char *git_dir = get_git_dir(); |
26c8a533 LT |
46 | va_list args; |
47 | unsigned len; | |
48 | ||
49 | len = strlen(git_dir); | |
50 | if (len > PATH_MAX-100) | |
51 | return bad_path; | |
52 | memcpy(pathname, git_dir, len); | |
53 | if (len && git_dir[len-1] != '/') | |
54 | pathname[len++] = '/'; | |
55 | va_start(args, fmt); | |
56 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); | |
57 | va_end(args); | |
58 | if (len >= PATH_MAX) | |
59 | return bad_path; | |
60 | return cleanup_path(pathname); | |
61 | } | |
f2db68ed HE |
62 | |
63 | ||
64 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ | |
65 | int git_mkstemp(char *path, size_t len, const char *template) | |
66 | { | |
67 | char *env, *pch = path; | |
68 | ||
69 | if ((env = getenv("TMPDIR")) == NULL) { | |
70 | strcpy(pch, "/tmp/"); | |
71 | len -= 5; | |
35c3c629 HE |
72 | pch += 5; |
73 | } else { | |
74 | size_t n = snprintf(pch, len, "%s/", env); | |
75 | ||
76 | len -= n; | |
77 | pch += n; | |
78 | } | |
f2db68ed HE |
79 | |
80 | safe_strncpy(pch, template, len); | |
81 | ||
82 | return mkstemp(path); | |
83 | } | |
84 | ||
85 | ||
86 | char *safe_strncpy(char *dest, const char *src, size_t n) | |
87 | { | |
88 | strncpy(dest, src, n); | |
89 | dest[n - 1] = '\0'; | |
90 | ||
91 | return dest; | |
92 | } | |
54f4b874 AE |
93 | |
94 | static char *current_dir() | |
95 | { | |
96 | return getcwd(pathname, sizeof(pathname)); | |
97 | } | |
98 | ||
99 | /* Take a raw path from is_git_repo() and canonicalize it using Linus' | |
100 | * idea of a blind chdir() and getcwd(). */ | |
101 | static const char *canonical_path(char *path, int strict) | |
102 | { | |
103 | char *dir = path; | |
104 | ||
105 | if(strict && *dir != '/') | |
106 | return NULL; | |
107 | ||
108 | if(*dir == '~') { /* user-relative path */ | |
109 | struct passwd *pw; | |
110 | char *slash = strchr(dir, '/'); | |
111 | ||
112 | dir++; | |
113 | /* '~/' and '~' (no slash) means users own home-dir */ | |
114 | if(!*dir || *dir == '/') | |
115 | pw = getpwuid(getuid()); | |
116 | else { | |
117 | if (slash) { | |
118 | *slash = '\0'; | |
119 | pw = getpwnam(dir); | |
120 | *slash = '/'; | |
121 | } | |
122 | else | |
123 | pw = getpwnam(dir); | |
124 | } | |
125 | ||
126 | /* make sure we got something back that we can chdir() to */ | |
127 | if(!pw || chdir(pw->pw_dir) < 0) | |
128 | return NULL; | |
129 | ||
130 | if(!slash || !slash[1]) /* no path following username */ | |
131 | return current_dir(); | |
132 | ||
133 | dir = slash + 1; | |
134 | } | |
135 | ||
136 | /* ~foo/path/to/repo is now path/to/repo and we're in foo's homedir */ | |
137 | if(chdir(dir) < 0) | |
138 | return NULL; | |
139 | ||
140 | return current_dir(); | |
141 | } | |
142 | ||
143 | char *enter_repo(char *path, int strict) | |
144 | { | |
145 | if(!path) | |
146 | return NULL; | |
147 | ||
148 | if(!canonical_path(path, strict)) { | |
149 | if(strict || !canonical_path(mkpath("%s.git", path), strict)) | |
150 | return NULL; | |
151 | } | |
152 | ||
153 | /* This is perfectly safe, and people tend to think of the directory | |
154 | * where they ran git-init-db as their repository, so humour them. */ | |
155 | (void)chdir(".git"); | |
156 | ||
157 | if(access("objects", X_OK) == 0 && access("refs", X_OK) == 0) { | |
158 | putenv("GIT_DIR=."); | |
159 | return current_dir(); | |
160 | } | |
161 | ||
162 | return NULL; | |
163 | } |