4 static int inside_git_dir = -1;
5 static int inside_work_tree = -1;
7 const char *prefix_path(const char *prefix, int len, const char *path)
9 const char *orig = path;
35 /* Remove last component of the prefix */
38 die("'%s' is outside repository", orig);
40 } while (len && prefix[len-1] != '/');
44 int speclen = strlen(path);
45 char *n = xmalloc(speclen + len + 1);
47 memcpy(n, prefix, len);
48 memcpy(n + len, path, speclen+1);
55 * Unlike prefix_path, this should be used if the named file does
56 * not have to interact with index entry; i.e. name of a random file
59 const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
61 static char path[PATH_MAX];
62 if (!pfx || !*pfx || arg[0] == '/')
64 memcpy(path, pfx, pfx_len);
65 strcpy(path + pfx_len, arg);
70 * Verify a filename that we got as an argument for a pathspec
71 * entry. Note that a filename that begins with "-" never verifies
72 * as true, because even if such a filename were to exist, we want
73 * it to be preceded by the "--" marker (or we want the user to
74 * use a format like "./-filename")
76 void verify_filename(const char *prefix, const char *arg)
82 die("bad flag '%s' used after filename", arg);
83 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
84 if (!lstat(name, &st))
87 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
88 "Use '--' to separate paths from revisions", arg);
89 die("'%s': %s", arg, strerror(errno));
93 * Opposite of the above: the command line did not have -- marker
94 * and we parsed the arg as a refname. It should not be interpretable
97 void verify_non_filename(const char *prefix, const char *arg)
102 if (!is_inside_work_tree() || is_inside_git_dir())
106 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
107 if (!lstat(name, &st))
108 die("ambiguous argument '%s': both revision and filename\n"
109 "Use '--' to separate filenames from revisions", arg);
111 die("'%s': %s", arg, strerror(errno));
114 const char **get_pathspec(const char *prefix, const char **pathspec)
116 const char *entry = *pathspec;
120 if (!prefix && !entry)
124 static const char *spec[2];
130 /* Otherwise we have to re-write the entries.. */
132 prefixlen = prefix ? strlen(prefix) : 0;
134 *p = prefix_path(prefix, prefixlen, entry);
135 } while ((entry = *++p) != NULL);
136 return (const char **) pathspec;
140 * Test if it looks like we're at a git directory.
143 * - either a objects/ directory _or_ the proper
144 * GIT_OBJECT_DIRECTORY environment variable
145 * - a refs/ directory
146 * - either a HEAD symlink or a HEAD file that is formatted as
147 * a proper "ref:", or a regular file HEAD that has a properly
148 * formatted sha1 object name.
150 static int is_git_directory(const char *suspect)
153 size_t len = strlen(suspect);
155 strcpy(path, suspect);
156 if (getenv(DB_ENVIRONMENT)) {
157 if (access(getenv(DB_ENVIRONMENT), X_OK))
161 strcpy(path + len, "/objects");
162 if (access(path, X_OK))
166 strcpy(path + len, "/refs");
167 if (access(path, X_OK))
170 strcpy(path + len, "/HEAD");
171 if (validate_headref(path))
177 int is_inside_git_dir(void)
179 if (inside_git_dir < 0)
180 inside_git_dir = is_inside_dir(get_git_dir());
181 return inside_git_dir;
184 int is_inside_work_tree(void)
186 if (inside_work_tree < 0)
187 inside_work_tree = is_inside_dir(get_git_work_tree());
188 return inside_work_tree;
192 * If no worktree was given, and we are outside of a default work tree,
193 * now is the time to set it.
195 * In other words, if the user calls git with something like
197 * git --git-dir=/some/where/else/.git bla
199 * default to /some/where/else as working directory; if the specified
200 * git-dir does not end in "/.git", the cwd is used as working directory.
202 const char *set_work_tree(const char *dir)
204 char dir_buffer[PATH_MAX], *rel = NULL;
205 static char buffer[PATH_MAX + 1];
206 int len, suffix_len = strlen(DEFAULT_GIT_DIR_ENVIRONMENT) + 1;
208 /* strip the variable 'dir' of the postfix "/.git" if it has it */
210 if (len > suffix_len &&
211 !strcmp(dir + len - suffix_len, "/" DEFAULT_GIT_DIR_ENVIRONMENT)) {
212 if ((len - suffix_len) >= sizeof(dir_buffer))
213 die("directory name too long");
214 memcpy(dir_buffer, dir, len - suffix_len);
215 dir_buffer[len - suffix_len] = '\0';
217 /* are we inside the default work tree? */
218 rel = get_relative_cwd(buffer, sizeof(buffer), dir_buffer);
221 /* if rel is set, the cwd is _not_ the current working tree */
223 if (!is_absolute_path(dir))
224 set_git_dir(make_absolute_path(dir));
227 die("cannot chdir to %s: %s", dir, strerror(errno));
233 dir = getcwd(buffer, sizeof(buffer));
235 git_work_tree_cfg = xstrdup(dir);
236 inside_work_tree = 1;
242 * We cannot decide in this function whether we are in the work tree or
243 * not, since the config can only be read _after_ this function was called.
245 const char *setup_git_directory_gently(int *nongit_ok)
247 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
248 static char cwd[PATH_MAX+1];
249 const char *gitdirenv;
253 * If GIT_DIR is set explicitly, we're not going
254 * to do any discovery, but we still do repository
257 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
259 if (PATH_MAX - 40 < strlen(gitdirenv))
260 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
261 if (is_git_directory(gitdirenv)) {
263 return set_work_tree(gitdirenv);
270 die("Not a git repository: '%s'", gitdirenv);
273 if (!getcwd(cwd, sizeof(cwd)-1))
274 die("Unable to read current working directory");
277 * Test in the following order (relative to the cwd):
285 offset = len = strlen(cwd);
287 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
289 if (is_git_directory(".")) {
292 inside_work_tree = 0;
293 setenv(GIT_DIR_ENVIRONMENT, ".", 1);
301 die("Cannot come back to cwd");
305 die("Not a git repository");
307 } while (cwd[--offset] != '/');
312 inside_work_tree = 1;
313 git_work_tree_cfg = xstrndup(cwd, offset);
317 /* Make "offset" point to past the '/', and add a '/' at the end */
324 int git_config_perm(const char *var, const char *value)
328 if (!strcmp(value, "umask"))
330 if (!strcmp(value, "group"))
332 if (!strcmp(value, "all") ||
333 !strcmp(value, "world") ||
334 !strcmp(value, "everybody"))
335 return PERM_EVERYBODY;
340 return git_config_bool(var, value);
343 int check_repository_format_version(const char *var, const char *value)
345 if (strcmp(var, "core.repositoryformatversion") == 0)
346 repository_format_version = git_config_int(var, value);
347 else if (strcmp(var, "core.sharedrepository") == 0)
348 shared_repository = git_config_perm(var, value);
349 else if (strcmp(var, "core.bare") == 0) {
350 is_bare_repository_cfg = git_config_bool(var, value);
351 if (is_bare_repository_cfg == 1)
352 inside_work_tree = -1;
353 } else if (strcmp(var, "core.worktree") == 0) {
354 if (git_work_tree_cfg)
355 free(git_work_tree_cfg);
356 git_work_tree_cfg = xstrdup(value);
357 inside_work_tree = -1;
362 int check_repository_format(void)
364 git_config(check_repository_format_version);
365 if (GIT_REPO_VERSION < repository_format_version)
366 die ("Expected git repo version <= %d, found %d",
367 GIT_REPO_VERSION, repository_format_version);
371 const char *setup_git_directory(void)
373 const char *retval = setup_git_directory_gently(NULL);
374 check_repository_format();
376 /* If the work tree is not the default one, recompute prefix */
377 if (inside_work_tree < 0) {
378 static char buffer[PATH_MAX + 1];
380 if (retval && chdir(retval))
381 die ("Could not jump back into original cwd");
382 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
383 return rel && *rel ? strcat(rel, "/") : NULL;