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];
205 static char buffer[PATH_MAX + 1], *rel = NULL;
206 int len, postfix_len = strlen(DEFAULT_GIT_DIR_ENVIRONMENT) + 1;
208 /* strip the variable 'dir' of the postfix "/.git" if it has it */
210 if (len > postfix_len && !strcmp(dir + len - postfix_len,
211 "/" DEFAULT_GIT_DIR_ENVIRONMENT)) {
212 strncpy(dir_buffer, dir, len - postfix_len);
214 /* are we inside the default work tree? */
215 rel = get_relative_cwd(buffer, sizeof(buffer), dir_buffer);
217 /* if rel is set, the cwd is _not_ the current working tree */
219 if (!is_absolute_path(dir))
220 set_git_dir(make_absolute_path(dir));
227 dir = getcwd(buffer, sizeof(buffer));
229 git_work_tree_cfg = xstrdup(dir);
230 inside_work_tree = 1;
236 * We cannot decide in this function whether we are in the work tree or
237 * not, since the config can only be read _after_ this function was called.
239 const char *setup_git_directory_gently(int *nongit_ok)
241 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
242 static char cwd[PATH_MAX+1];
243 const char *gitdirenv;
247 * If GIT_DIR is set explicitly, we're not going
248 * to do any discovery, but we still do repository
251 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
253 if (PATH_MAX - 40 < strlen(gitdirenv))
254 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
255 if (is_git_directory(gitdirenv)) {
257 return set_work_tree(gitdirenv);
264 die("Not a git repository: '%s'", gitdirenv);
267 if (!getcwd(cwd, sizeof(cwd)-1))
268 die("Unable to read current working directory");
271 * Test in the following order (relative to the cwd):
279 offset = len = strlen(cwd);
281 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
283 if (is_git_directory(".")) {
286 inside_work_tree = 0;
287 setenv(GIT_DIR_ENVIRONMENT, ".", 1);
295 die("Cannot come back to cwd");
299 die("Not a git repository");
301 } while (cwd[--offset] != '/');
306 inside_work_tree = 1;
307 git_work_tree_cfg = xstrndup(cwd, offset);
311 /* Make "offset" point to past the '/', and add a '/' at the end */
318 int git_config_perm(const char *var, const char *value)
322 if (!strcmp(value, "umask"))
324 if (!strcmp(value, "group"))
326 if (!strcmp(value, "all") ||
327 !strcmp(value, "world") ||
328 !strcmp(value, "everybody"))
329 return PERM_EVERYBODY;
334 return git_config_bool(var, value);
337 int check_repository_format_version(const char *var, const char *value)
339 if (strcmp(var, "core.repositoryformatversion") == 0)
340 repository_format_version = git_config_int(var, value);
341 else if (strcmp(var, "core.sharedrepository") == 0)
342 shared_repository = git_config_perm(var, value);
343 else if (strcmp(var, "core.bare") == 0) {
344 is_bare_repository_cfg = git_config_bool(var, value);
345 if (is_bare_repository_cfg == 1)
346 inside_work_tree = -1;
347 } else if (strcmp(var, "core.worktree") == 0) {
348 if (git_work_tree_cfg)
349 free(git_work_tree_cfg);
350 git_work_tree_cfg = xstrdup(value);
351 inside_work_tree = -1;
356 int check_repository_format(void)
358 git_config(check_repository_format_version);
359 if (GIT_REPO_VERSION < repository_format_version)
360 die ("Expected git repo version <= %d, found %d",
361 GIT_REPO_VERSION, repository_format_version);
365 const char *setup_git_directory(void)
367 const char *retval = setup_git_directory_gently(NULL);
368 check_repository_format();
370 /* If the work tree is not the default one, recompute prefix */
371 if (inside_work_tree < 0) {
372 static char buffer[PATH_MAX + 1];
374 if (retval && chdir(retval))
375 die ("Could not jump back into original cwd");
376 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
377 return rel && *rel ? strcat(rel, "/") : NULL;