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Commit | Line | Data |
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d288a700 LT |
1 | #include "cache.h" |
2 | ||
6b5ee137 | 3 | const char *prefix_path(const char *prefix, int len, const char *path) |
f332726e | 4 | { |
6b5ee137 | 5 | const char *orig = path; |
f332726e LT |
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 | ||
4ca06608 JH |
50 | /* |
51 | * Unlike prefix_path, this should be used if the named file does | |
52 | * not have to interact with index entry; i.e. name of a random file | |
53 | * on the filesystem. | |
54 | */ | |
55 | const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) | |
56 | { | |
57 | static char path[PATH_MAX]; | |
58 | if (!pfx || !*pfx || arg[0] == '/') | |
59 | return arg; | |
60 | memcpy(path, pfx, pfx_len); | |
61 | strcpy(path + pfx_len, arg); | |
62 | return path; | |
63 | } | |
64 | ||
e23d0b4a LT |
65 | /* |
66 | * Verify a filename that we got as an argument for a pathspec | |
67 | * entry. Note that a filename that begins with "-" never verifies | |
68 | * as true, because even if such a filename were to exist, we want | |
69 | * it to be preceded by the "--" marker (or we want the user to | |
70 | * use a format like "./-filename") | |
71 | */ | |
72 | void verify_filename(const char *prefix, const char *arg) | |
73 | { | |
74 | const char *name; | |
75 | struct stat st; | |
76 | ||
77 | if (*arg == '-') | |
78 | die("bad flag '%s' used after filename", arg); | |
79 | name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; | |
80 | if (!lstat(name, &st)) | |
81 | return; | |
82 | if (errno == ENOENT) | |
ea92f41f JH |
83 | die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" |
84 | "Use '--' to separate paths from revisions", arg); | |
e23d0b4a LT |
85 | die("'%s': %s", arg, strerror(errno)); |
86 | } | |
87 | ||
ea92f41f JH |
88 | /* |
89 | * Opposite of the above: the command line did not have -- marker | |
90 | * and we parsed the arg as a refname. It should not be interpretable | |
91 | * as a filename. | |
92 | */ | |
93 | void verify_non_filename(const char *prefix, const char *arg) | |
94 | { | |
95 | const char *name; | |
96 | struct stat st; | |
97 | ||
98 | if (*arg == '-') | |
99 | return; /* flag */ | |
100 | name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; | |
101 | if (!lstat(name, &st)) | |
102 | die("ambiguous argument '%s': both revision and filename\n" | |
103 | "Use '--' to separate filenames from revisions", arg); | |
104 | if (errno != ENOENT) | |
105 | die("'%s': %s", arg, strerror(errno)); | |
106 | } | |
107 | ||
6b5ee137 | 108 | const char **get_pathspec(const char *prefix, const char **pathspec) |
d288a700 | 109 | { |
6b5ee137 JH |
110 | const char *entry = *pathspec; |
111 | const char **p; | |
d288a700 LT |
112 | int prefixlen; |
113 | ||
f332726e LT |
114 | if (!prefix && !entry) |
115 | return NULL; | |
d288a700 LT |
116 | |
117 | if (!entry) { | |
118 | static const char *spec[2]; | |
119 | spec[0] = prefix; | |
120 | spec[1] = NULL; | |
121 | return spec; | |
122 | } | |
123 | ||
124 | /* Otherwise we have to re-write the entries.. */ | |
d288a700 | 125 | p = pathspec; |
f332726e | 126 | prefixlen = prefix ? strlen(prefix) : 0; |
d288a700 | 127 | do { |
f332726e | 128 | *p = prefix_path(prefix, prefixlen, entry); |
d288a700 LT |
129 | } while ((entry = *++p) != NULL); |
130 | return (const char **) pathspec; | |
131 | } | |
132 | ||
5f5608bc | 133 | /* |
ad1a382f | 134 | * Test if it looks like we're at a git directory. |
5e7bfe25 | 135 | * We want to see: |
5f5608bc | 136 | * |
ad1a382f | 137 | * - either a objects/ directory _or_ the proper |
5f5608bc | 138 | * GIT_OBJECT_DIRECTORY environment variable |
ad1a382f | 139 | * - a refs/ directory |
8098a178 | 140 | * - either a HEAD symlink or a HEAD file that is formatted as |
c847f537 JH |
141 | * a proper "ref:", or a regular file HEAD that has a properly |
142 | * formatted sha1 object name. | |
5f5608bc | 143 | */ |
ad1a382f | 144 | static int is_git_directory(const char *suspect) |
5f5608bc | 145 | { |
ad1a382f SP |
146 | char path[PATH_MAX]; |
147 | size_t len = strlen(suspect); | |
148 | ||
149 | strcpy(path, suspect); | |
150 | if (getenv(DB_ENVIRONMENT)) { | |
151 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
152 | return 0; | |
153 | } | |
154 | else { | |
155 | strcpy(path + len, "/objects"); | |
156 | if (access(path, X_OK)) | |
157 | return 0; | |
158 | } | |
159 | ||
160 | strcpy(path + len, "/refs"); | |
161 | if (access(path, X_OK)) | |
8098a178 | 162 | return 0; |
ad1a382f SP |
163 | |
164 | strcpy(path + len, "/HEAD"); | |
c847f537 | 165 | if (validate_headref(path)) |
ad1a382f SP |
166 | return 0; |
167 | ||
8098a178 | 168 | return 1; |
5f5608bc LT |
169 | } |
170 | ||
4ca06608 | 171 | const char *setup_git_directory_gently(int *nongit_ok) |
d288a700 LT |
172 | { |
173 | static char cwd[PATH_MAX+1]; | |
ad1a382f | 174 | const char *gitdirenv; |
d288a700 LT |
175 | int len, offset; |
176 | ||
177 | /* | |
178 | * If GIT_DIR is set explicitly, we're not going | |
5e7bfe25 JH |
179 | * to do any discovery, but we still do repository |
180 | * validation. | |
d288a700 | 181 | */ |
ad1a382f SP |
182 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); |
183 | if (gitdirenv) { | |
184 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
5e7bfe25 | 185 | die("'$%s' too big", GIT_DIR_ENVIRONMENT); |
ad1a382f SP |
186 | if (is_git_directory(gitdirenv)) |
187 | return NULL; | |
3a3c3fc4 | 188 | if (nongit_ok) { |
41e95f69 ML |
189 | *nongit_ok = 1; |
190 | return NULL; | |
191 | } | |
ad1a382f | 192 | die("Not a git repository: '%s'", gitdirenv); |
5e7bfe25 | 193 | } |
d288a700 LT |
194 | |
195 | if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/') | |
196 | die("Unable to read current working directory"); | |
197 | ||
198 | offset = len = strlen(cwd); | |
199 | for (;;) { | |
ad1a382f | 200 | if (is_git_directory(".git")) |
5f5608bc | 201 | break; |
d288a700 LT |
202 | chdir(".."); |
203 | do { | |
4ca06608 | 204 | if (!offset) { |
ad1a382f SP |
205 | if (is_git_directory(cwd)) { |
206 | if (chdir(cwd)) | |
207 | die("Cannot come back to cwd"); | |
208 | setenv(GIT_DIR_ENVIRONMENT, cwd, 1); | |
209 | return NULL; | |
210 | } | |
4ca06608 JH |
211 | if (nongit_ok) { |
212 | if (chdir(cwd)) | |
213 | die("Cannot come back to cwd"); | |
214 | *nongit_ok = 1; | |
215 | return NULL; | |
216 | } | |
d288a700 | 217 | die("Not a git repository"); |
4ca06608 | 218 | } |
d288a700 LT |
219 | } while (cwd[--offset] != '/'); |
220 | } | |
221 | ||
222 | if (offset == len) | |
223 | return NULL; | |
224 | ||
225 | /* Make "offset" point to past the '/', and add a '/' at the end */ | |
226 | offset++; | |
227 | cwd[len++] = '/'; | |
228 | cwd[len] = 0; | |
229 | return cwd + offset; | |
230 | } | |
5e7bfe25 | 231 | |
94df2506 JH |
232 | int git_config_perm(const char *var, const char *value) |
233 | { | |
234 | if (value) { | |
235 | if (!strcmp(value, "umask")) | |
236 | return PERM_UMASK; | |
237 | if (!strcmp(value, "group")) | |
238 | return PERM_GROUP; | |
239 | if (!strcmp(value, "all") || | |
240 | !strcmp(value, "world") || | |
241 | !strcmp(value, "everybody")) | |
242 | return PERM_EVERYBODY; | |
243 | } | |
244 | return git_config_bool(var, value); | |
245 | } | |
246 | ||
ab9cb76f JH |
247 | int check_repository_format_version(const char *var, const char *value) |
248 | { | |
249 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
250 | repository_format_version = git_config_int(var, value); | |
457f06d6 | 251 | else if (strcmp(var, "core.sharedrepository") == 0) |
94df2506 | 252 | shared_repository = git_config_perm(var, value); |
ab9cb76f JH |
253 | return 0; |
254 | } | |
255 | ||
256 | int check_repository_format(void) | |
257 | { | |
258 | git_config(check_repository_format_version); | |
259 | if (GIT_REPO_VERSION < repository_format_version) | |
260 | die ("Expected git repo version <= %d, found %d", | |
261 | GIT_REPO_VERSION, repository_format_version); | |
262 | return 0; | |
263 | } | |
264 | ||
5e7bfe25 JH |
265 | const char *setup_git_directory(void) |
266 | { | |
4ca06608 | 267 | const char *retval = setup_git_directory_gently(NULL); |
22752e4c | 268 | check_repository_format(); |
5e7bfe25 JH |
269 | return retval; |
270 | } |