packv4: nth_packed_object_sha1() packv4 support
[git/packv4.git] / setup.c
blob06004f15874fbcbab50eafd272c5898a34fcdcfe
1 #include "cache.h"
2 #include "dir.h"
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;
10 for (;;) {
11 char c;
12 if (*path != '.')
13 break;
14 c = path[1];
15 /* "." */
16 if (!c) {
17 path++;
18 break;
20 /* "./" */
21 if (c == '/') {
22 path += 2;
23 continue;
25 if (c != '.')
26 break;
27 c = path[2];
28 if (!c)
29 path += 2;
30 else if (c == '/')
31 path += 3;
32 else
33 break;
34 /* ".." and "../" */
35 /* Remove last component of the prefix */
36 do {
37 if (!len)
38 die("'%s' is outside repository", orig);
39 len--;
40 } while (len && prefix[len-1] != '/');
41 continue;
43 if (len) {
44 int speclen = strlen(path);
45 char *n = xmalloc(speclen + len + 1);
47 memcpy(n, prefix, len);
48 memcpy(n + len, path, speclen+1);
49 path = n;
51 return path;
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
57 * on the filesystem.
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] == '/')
63 return arg;
64 memcpy(path, pfx, pfx_len);
65 strcpy(path + pfx_len, arg);
66 return path;
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)
78 const char *name;
79 struct stat st;
81 if (*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))
85 return;
86 if (errno == ENOENT)
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
95 * as a filename.
97 void verify_non_filename(const char *prefix, const char *arg)
99 const char *name;
100 struct stat st;
102 if (!is_inside_work_tree() || is_inside_git_dir())
103 return;
104 if (*arg == '-')
105 return; /* flag */
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);
110 if (errno != ENOENT && errno != ENOTDIR)
111 die("'%s': %s", arg, strerror(errno));
114 const char **get_pathspec(const char *prefix, const char **pathspec)
116 const char *entry = *pathspec;
117 const char **p;
118 int prefixlen;
120 if (!prefix && !entry)
121 return NULL;
123 if (!entry) {
124 static const char *spec[2];
125 spec[0] = prefix;
126 spec[1] = NULL;
127 return spec;
130 /* Otherwise we have to re-write the entries.. */
131 p = pathspec;
132 prefixlen = prefix ? strlen(prefix) : 0;
133 do {
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.
141 * We want to see:
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)
152 char path[PATH_MAX];
153 size_t len = strlen(suspect);
155 strcpy(path, suspect);
156 if (getenv(DB_ENVIRONMENT)) {
157 if (access(getenv(DB_ENVIRONMENT), X_OK))
158 return 0;
160 else {
161 strcpy(path + len, "/objects");
162 if (access(path, X_OK))
163 return 0;
166 strcpy(path + len, "/refs");
167 if (access(path, X_OK))
168 return 0;
170 strcpy(path + len, "/HEAD");
171 if (validate_headref(path))
172 return 0;
174 return 1;
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 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
193 * The old behaviour (which we retain here) is to set the work tree root
194 * to the cwd, unless overridden by the config, the command line, or
195 * GIT_WORK_TREE.
197 static const char *set_work_tree(const char *dir)
199 char buffer[PATH_MAX + 1];
201 if (!getcwd(buffer, sizeof(buffer)))
202 die ("Could not get the current working directory");
203 git_work_tree_cfg = xstrdup(buffer);
204 inside_work_tree = 1;
206 return NULL;
210 * We cannot decide in this function whether we are in the work tree or
211 * not, since the config can only be read _after_ this function was called.
213 const char *setup_git_directory_gently(int *nongit_ok)
215 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
216 static char cwd[PATH_MAX+1];
217 const char *gitdirenv;
218 int len, offset;
221 * If GIT_DIR is set explicitly, we're not going
222 * to do any discovery, but we still do repository
223 * validation.
225 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
226 if (gitdirenv) {
227 if (PATH_MAX - 40 < strlen(gitdirenv))
228 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
229 if (is_git_directory(gitdirenv)) {
230 if (!work_tree_env)
231 return set_work_tree(gitdirenv);
232 return NULL;
234 if (nongit_ok) {
235 *nongit_ok = 1;
236 return NULL;
238 die("Not a git repository: '%s'", gitdirenv);
241 if (!getcwd(cwd, sizeof(cwd)-1))
242 die("Unable to read current working directory");
245 * Test in the following order (relative to the cwd):
246 * - .git/
247 * - ./ (bare)
248 * - ../.git/
249 * - ../ (bare)
250 * - ../../.git/
251 * etc.
253 offset = len = strlen(cwd);
254 for (;;) {
255 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
256 break;
257 if (is_git_directory(".")) {
258 inside_git_dir = 1;
259 if (!work_tree_env)
260 inside_work_tree = 0;
261 setenv(GIT_DIR_ENVIRONMENT, ".", 1);
262 return NULL;
264 chdir("..");
265 do {
266 if (!offset) {
267 if (nongit_ok) {
268 if (chdir(cwd))
269 die("Cannot come back to cwd");
270 *nongit_ok = 1;
271 return NULL;
273 die("Not a git repository");
275 } while (cwd[--offset] != '/');
278 inside_git_dir = 0;
279 if (!work_tree_env)
280 inside_work_tree = 1;
281 git_work_tree_cfg = xstrndup(cwd, offset);
282 if (offset == len)
283 return NULL;
285 /* Make "offset" point to past the '/', and add a '/' at the end */
286 offset++;
287 cwd[len++] = '/';
288 cwd[len] = 0;
289 return cwd + offset;
292 int git_config_perm(const char *var, const char *value)
294 if (value) {
295 int i;
296 if (!strcmp(value, "umask"))
297 return PERM_UMASK;
298 if (!strcmp(value, "group"))
299 return PERM_GROUP;
300 if (!strcmp(value, "all") ||
301 !strcmp(value, "world") ||
302 !strcmp(value, "everybody"))
303 return PERM_EVERYBODY;
304 i = atoi(value);
305 if (i > 1)
306 return i;
308 return git_config_bool(var, value);
311 int check_repository_format_version(const char *var, const char *value)
313 if (strcmp(var, "core.repositoryformatversion") == 0)
314 repository_format_version = git_config_int(var, value);
315 else if (strcmp(var, "core.sharedrepository") == 0)
316 shared_repository = git_config_perm(var, value);
317 else if (strcmp(var, "core.bare") == 0) {
318 is_bare_repository_cfg = git_config_bool(var, value);
319 if (is_bare_repository_cfg == 1)
320 inside_work_tree = -1;
321 } else if (strcmp(var, "core.worktree") == 0) {
322 if (git_work_tree_cfg)
323 free(git_work_tree_cfg);
324 git_work_tree_cfg = xstrdup(value);
325 inside_work_tree = -1;
327 return 0;
330 int check_repository_format(void)
332 git_config(check_repository_format_version);
333 if (GIT_REPO_VERSION < repository_format_version)
334 die ("Expected git repo version <= %d, found %d",
335 GIT_REPO_VERSION, repository_format_version);
336 return 0;
339 const char *setup_git_directory(void)
341 const char *retval = setup_git_directory_gently(NULL);
342 check_repository_format();
344 /* If the work tree is not the default one, recompute prefix */
345 if (inside_work_tree < 0) {
346 static char buffer[PATH_MAX + 1];
347 char *rel;
348 if (retval && chdir(retval))
349 die ("Could not jump back into original cwd");
350 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
351 return rel && *rel ? strcat(rel, "/") : NULL;
354 return retval;