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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 | ||
68025633 JS |
98 | if (is_inside_git_dir()) |
99 | return; | |
ea92f41f JH |
100 | if (*arg == '-') |
101 | return; /* flag */ | |
102 | name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; | |
103 | if (!lstat(name, &st)) | |
104 | die("ambiguous argument '%s': both revision and filename\n" | |
105 | "Use '--' to separate filenames from revisions", arg); | |
106 | if (errno != ENOENT) | |
107 | die("'%s': %s", arg, strerror(errno)); | |
108 | } | |
109 | ||
6b5ee137 | 110 | const char **get_pathspec(const char *prefix, const char **pathspec) |
d288a700 | 111 | { |
6b5ee137 JH |
112 | const char *entry = *pathspec; |
113 | const char **p; | |
d288a700 LT |
114 | int prefixlen; |
115 | ||
f332726e LT |
116 | if (!prefix && !entry) |
117 | return NULL; | |
d288a700 LT |
118 | |
119 | if (!entry) { | |
120 | static const char *spec[2]; | |
121 | spec[0] = prefix; | |
122 | spec[1] = NULL; | |
123 | return spec; | |
124 | } | |
125 | ||
126 | /* Otherwise we have to re-write the entries.. */ | |
d288a700 | 127 | p = pathspec; |
f332726e | 128 | prefixlen = prefix ? strlen(prefix) : 0; |
d288a700 | 129 | do { |
f332726e | 130 | *p = prefix_path(prefix, prefixlen, entry); |
d288a700 LT |
131 | } while ((entry = *++p) != NULL); |
132 | return (const char **) pathspec; | |
133 | } | |
134 | ||
5f5608bc | 135 | /* |
ad1a382f | 136 | * Test if it looks like we're at a git directory. |
5e7bfe25 | 137 | * We want to see: |
5f5608bc | 138 | * |
ad1a382f | 139 | * - either a objects/ directory _or_ the proper |
5f5608bc | 140 | * GIT_OBJECT_DIRECTORY environment variable |
ad1a382f | 141 | * - a refs/ directory |
8098a178 | 142 | * - either a HEAD symlink or a HEAD file that is formatted as |
c847f537 JH |
143 | * a proper "ref:", or a regular file HEAD that has a properly |
144 | * formatted sha1 object name. | |
5f5608bc | 145 | */ |
ad1a382f | 146 | static int is_git_directory(const char *suspect) |
5f5608bc | 147 | { |
ad1a382f SP |
148 | char path[PATH_MAX]; |
149 | size_t len = strlen(suspect); | |
150 | ||
151 | strcpy(path, suspect); | |
152 | if (getenv(DB_ENVIRONMENT)) { | |
153 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
154 | return 0; | |
155 | } | |
156 | else { | |
157 | strcpy(path + len, "/objects"); | |
158 | if (access(path, X_OK)) | |
159 | return 0; | |
160 | } | |
161 | ||
162 | strcpy(path + len, "/refs"); | |
163 | if (access(path, X_OK)) | |
8098a178 | 164 | return 0; |
ad1a382f SP |
165 | |
166 | strcpy(path + len, "/HEAD"); | |
c847f537 | 167 | if (validate_headref(path)) |
ad1a382f SP |
168 | return 0; |
169 | ||
8098a178 | 170 | return 1; |
5f5608bc LT |
171 | } |
172 | ||
68025633 JS |
173 | static int inside_git_dir = -1; |
174 | ||
175 | int is_inside_git_dir(void) | |
176 | { | |
177 | if (inside_git_dir < 0) { | |
178 | char buffer[1024]; | |
179 | ||
180 | if (is_bare_repository()) | |
181 | return (inside_git_dir = 1); | |
182 | if (getcwd(buffer, sizeof(buffer))) { | |
183 | const char *git_dir = get_git_dir(), *cwd = buffer; | |
184 | while (*git_dir && *git_dir == *cwd) { | |
185 | git_dir++; | |
186 | cwd++; | |
187 | } | |
188 | inside_git_dir = !*git_dir; | |
189 | } else | |
190 | inside_git_dir = 0; | |
191 | } | |
192 | return inside_git_dir; | |
193 | } | |
194 | ||
4ca06608 | 195 | const char *setup_git_directory_gently(int *nongit_ok) |
d288a700 LT |
196 | { |
197 | static char cwd[PATH_MAX+1]; | |
ad1a382f | 198 | const char *gitdirenv; |
d288a700 LT |
199 | int len, offset; |
200 | ||
201 | /* | |
202 | * If GIT_DIR is set explicitly, we're not going | |
5e7bfe25 JH |
203 | * to do any discovery, but we still do repository |
204 | * validation. | |
d288a700 | 205 | */ |
ad1a382f SP |
206 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); |
207 | if (gitdirenv) { | |
208 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
5e7bfe25 | 209 | die("'$%s' too big", GIT_DIR_ENVIRONMENT); |
ad1a382f SP |
210 | if (is_git_directory(gitdirenv)) |
211 | return NULL; | |
3a3c3fc4 | 212 | if (nongit_ok) { |
41e95f69 ML |
213 | *nongit_ok = 1; |
214 | return NULL; | |
215 | } | |
ad1a382f | 216 | die("Not a git repository: '%s'", gitdirenv); |
5e7bfe25 | 217 | } |
d288a700 | 218 | |
96a57024 | 219 | if (!getcwd(cwd, sizeof(cwd)-1) || cwd[0] != '/') |
d288a700 LT |
220 | die("Unable to read current working directory"); |
221 | ||
222 | offset = len = strlen(cwd); | |
223 | for (;;) { | |
ad1a382f | 224 | if (is_git_directory(".git")) |
5f5608bc | 225 | break; |
d288a700 LT |
226 | chdir(".."); |
227 | do { | |
4ca06608 | 228 | if (!offset) { |
ad1a382f SP |
229 | if (is_git_directory(cwd)) { |
230 | if (chdir(cwd)) | |
231 | die("Cannot come back to cwd"); | |
232 | setenv(GIT_DIR_ENVIRONMENT, cwd, 1); | |
68025633 | 233 | inside_git_dir = 1; |
ad1a382f SP |
234 | return NULL; |
235 | } | |
4ca06608 JH |
236 | if (nongit_ok) { |
237 | if (chdir(cwd)) | |
238 | die("Cannot come back to cwd"); | |
239 | *nongit_ok = 1; | |
240 | return NULL; | |
241 | } | |
d288a700 | 242 | die("Not a git repository"); |
4ca06608 | 243 | } |
d288a700 LT |
244 | } while (cwd[--offset] != '/'); |
245 | } | |
246 | ||
247 | if (offset == len) | |
248 | return NULL; | |
249 | ||
250 | /* Make "offset" point to past the '/', and add a '/' at the end */ | |
251 | offset++; | |
252 | cwd[len++] = '/'; | |
253 | cwd[len] = 0; | |
cc44c765 | 254 | inside_git_dir = !prefixcmp(cwd + offset, ".git/"); |
d288a700 LT |
255 | return cwd + offset; |
256 | } | |
5e7bfe25 | 257 | |
94df2506 JH |
258 | int git_config_perm(const char *var, const char *value) |
259 | { | |
260 | if (value) { | |
261 | if (!strcmp(value, "umask")) | |
262 | return PERM_UMASK; | |
263 | if (!strcmp(value, "group")) | |
264 | return PERM_GROUP; | |
265 | if (!strcmp(value, "all") || | |
266 | !strcmp(value, "world") || | |
267 | !strcmp(value, "everybody")) | |
268 | return PERM_EVERYBODY; | |
269 | } | |
270 | return git_config_bool(var, value); | |
271 | } | |
272 | ||
ab9cb76f JH |
273 | int check_repository_format_version(const char *var, const char *value) |
274 | { | |
275 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
276 | repository_format_version = git_config_int(var, value); | |
457f06d6 | 277 | else if (strcmp(var, "core.sharedrepository") == 0) |
94df2506 | 278 | shared_repository = git_config_perm(var, value); |
ab9cb76f JH |
279 | return 0; |
280 | } | |
281 | ||
282 | int check_repository_format(void) | |
283 | { | |
284 | git_config(check_repository_format_version); | |
285 | if (GIT_REPO_VERSION < repository_format_version) | |
286 | die ("Expected git repo version <= %d, found %d", | |
287 | GIT_REPO_VERSION, repository_format_version); | |
288 | return 0; | |
289 | } | |
290 | ||
5e7bfe25 JH |
291 | const char *setup_git_directory(void) |
292 | { | |
4ca06608 | 293 | const char *retval = setup_git_directory_gently(NULL); |
22752e4c | 294 | check_repository_format(); |
5e7bfe25 JH |
295 | return retval; |
296 | } |