receive-pack: convert strncpy to xsnprintf
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
e90fdc39 2#include "dir.h"
31171d9e 3#include "string-list.h"
e90fdc39
JS
4
5static int inside_git_dir = -1;
6static int inside_work_tree = -1;
fada7674 7static int work_tree_config_is_bogus;
d288a700 8
ddc2a628
MEW
9/*
10 * The input parameter must contain an absolute path, and it must already be
11 * normalized.
12 *
13 * Find the part of an absolute path that lies inside the work tree by
14 * dereferencing symlinks outside the work tree, for example:
15 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
16 * /dir/file (work tree is /) -> dir/file
17 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
18 * /dir/repolink/file (repolink points to /dir/repo) -> file
19 * /dir/repo (exactly equal to work tree) -> (empty string)
20 */
21static int abspath_part_inside_repo(char *path)
22{
23 size_t len;
24 size_t wtlen;
25 char *path0;
26 int off;
27 const char *work_tree = get_git_work_tree();
28
29 if (!work_tree)
30 return -1;
31 wtlen = strlen(work_tree);
32 len = strlen(path);
6127ff63 33 off = offset_1st_component(path);
ddc2a628
MEW
34
35 /* check if work tree is already the prefix */
36 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
37 if (path[wtlen] == '/') {
38 memmove(path, path + wtlen + 1, len - wtlen);
39 return 0;
40 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
41 /* work tree is the root, or the whole path */
42 memmove(path, path + wtlen, len - wtlen + 1);
43 return 0;
44 }
45 /* work tree might match beginning of a symlink to work tree */
46 off = wtlen;
47 }
48 path0 = path;
6127ff63 49 path += off;
ddc2a628
MEW
50
51 /* check each '/'-terminated level */
52 while (*path) {
53 path++;
54 if (*path == '/') {
55 *path = '\0';
56 if (strcmp(real_path(path0), work_tree) == 0) {
57 memmove(path0, path + 1, len - (path - path0));
58 return 0;
59 }
60 *path = '/';
61 }
62 }
63
64 /* check whole path */
65 if (strcmp(real_path(path0), work_tree) == 0) {
66 *path0 = '\0';
67 return 0;
68 }
69
70 return -1;
71}
72
645a29c4
NTND
73/*
74 * Normalize "path", prepending the "prefix" for relative paths. If
75 * remaining_prefix is not NULL, return the actual prefix still
76 * remains in the path. For example, prefix = sub1/sub2/ and path is
77 *
78 * foo -> sub1/sub2/foo (full prefix)
79 * ../foo -> sub1/foo (remaining prefix is sub1/)
80 * ../../bar -> bar (no remaining prefix)
81 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
82 * `pwd`/../bar -> sub1/bar (no remaining prefix)
83 */
84char *prefix_path_gently(const char *prefix, int len,
85 int *remaining_prefix, const char *path)
d089ebaa
JH
86{
87 const char *orig = path;
18e051a3
CMAB
88 char *sanitized;
89 if (is_absolute_path(orig)) {
655ee9ea 90 sanitized = xmalloc(strlen(path) + 1);
645a29c4
NTND
91 if (remaining_prefix)
92 *remaining_prefix = 0;
655ee9ea
MEW
93 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
94 free(sanitized);
95 return NULL;
96 }
97 if (abspath_part_inside_repo(sanitized)) {
98 free(sanitized);
99 return NULL;
100 }
18e051a3
CMAB
101 } else {
102 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
103 if (len)
104 memcpy(sanitized, prefix, len);
105 strcpy(sanitized + len, path);
645a29c4
NTND
106 if (remaining_prefix)
107 *remaining_prefix = len;
655ee9ea 108 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
109 free(sanitized);
110 return NULL;
d089ebaa 111 }
d089ebaa
JH
112 }
113 return sanitized;
f332726e
LT
114}
115
546e0fd9
JK
116char *prefix_path(const char *prefix, int len, const char *path)
117{
645a29c4 118 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
119 if (!r)
120 die("'%s' is outside repository", path);
121 return r;
122}
123
124int path_inside_repo(const char *prefix, const char *path)
125{
126 int len = prefix ? strlen(prefix) : 0;
645a29c4 127 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
128 if (r) {
129 free(r);
130 return 1;
131 }
132 return 0;
133}
134
c6e8c800
JH
135int check_filename(const char *prefix, const char *arg)
136{
137 const char *name;
138 struct stat st;
139
59556548 140 if (starts_with(arg, ":/")) {
4db86e8b
NTND
141 if (arg[2] == '\0') /* ":/" is root dir, always exists */
142 return 1;
143 name = arg + 2;
28fcc0b7
NTND
144 } else if (!no_wildcard(arg))
145 return 1;
146 else if (prefix)
4db86e8b
NTND
147 name = prefix_filename(prefix, strlen(prefix), arg);
148 else
149 name = arg;
c6e8c800
JH
150 if (!lstat(name, &st))
151 return 1; /* file exists */
152 if (errno == ENOENT || errno == ENOTDIR)
153 return 0; /* file does not exist */
154 die_errno("failed to stat '%s'", arg);
155}
156
023e37c3
MM
157static void NORETURN die_verify_filename(const char *prefix,
158 const char *arg,
159 int diagnose_misspelt_rev)
009fee47 160{
023e37c3
MM
161 if (!diagnose_misspelt_rev)
162 die("%s: no such path in the working tree.\n"
4d4b5739 163 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 164 arg);
0e539dca
JH
165 /*
166 * Saying "'(icase)foo' does not exist in the index" when the
167 * user gave us ":(icase)foo" is just stupid. A magic pathspec
168 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 169 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
170 */
171 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 172 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 173
009fee47
MM
174 /* ... or fall back the most general message. */
175 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
176 "Use '--' to separate paths from revisions, like this:\n"
177 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
178
179}
180
e23d0b4a
LT
181/*
182 * Verify a filename that we got as an argument for a pathspec
183 * entry. Note that a filename that begins with "-" never verifies
184 * as true, because even if such a filename were to exist, we want
185 * it to be preceded by the "--" marker (or we want the user to
186 * use a format like "./-filename")
023e37c3
MM
187 *
188 * The "diagnose_misspelt_rev" is used to provide a user-friendly
189 * diagnosis when dying upon finding that "name" is not a pathname.
190 * If set to 1, the diagnosis will try to diagnose "name" as an
191 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
192 * will only complain about an inexisting file.
193 *
194 * This function is typically called to check that a "file or rev"
195 * argument is unambiguous. In this case, the caller will want
196 * diagnose_misspelt_rev == 1 when verifying the first non-rev
197 * argument (which could have been a revision), and
198 * diagnose_misspelt_rev == 0 for the next ones (because we already
199 * saw a filename, there's not ambiguity anymore).
e23d0b4a 200 */
023e37c3
MM
201void verify_filename(const char *prefix,
202 const char *arg,
203 int diagnose_misspelt_rev)
e23d0b4a 204{
e23d0b4a
LT
205 if (*arg == '-')
206 die("bad flag '%s' used after filename", arg);
c6e8c800 207 if (check_filename(prefix, arg))
e23d0b4a 208 return;
023e37c3 209 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
210}
211
ea92f41f
JH
212/*
213 * Opposite of the above: the command line did not have -- marker
214 * and we parsed the arg as a refname. It should not be interpretable
215 * as a filename.
216 */
217void verify_non_filename(const char *prefix, const char *arg)
218{
7ae3df8c 219 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 220 return;
ea92f41f
JH
221 if (*arg == '-')
222 return; /* flag */
c6e8c800
JH
223 if (!check_filename(prefix, arg))
224 return;
225 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
226 "Use '--' to separate paths from revisions, like this:\n"
227 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
228}
229
31e26ebc 230int get_common_dir(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
231{
232 struct strbuf data = STRBUF_INIT;
233 struct strbuf path = STRBUF_INIT;
234 const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
31e26ebc 235 int ret = 0;
4dc4e145
NTND
236 if (git_common_dir) {
237 strbuf_addstr(sb, git_common_dir);
31e26ebc 238 return 1;
4dc4e145
NTND
239 }
240 strbuf_addf(&path, "%s/commondir", gitdir);
241 if (file_exists(path.buf)) {
242 if (strbuf_read_file(&data, path.buf, 0) <= 0)
243 die_errno(_("failed to read %s"), path.buf);
244 while (data.len && (data.buf[data.len - 1] == '\n' ||
245 data.buf[data.len - 1] == '\r'))
246 data.len--;
247 data.buf[data.len] = '\0';
248 strbuf_reset(&path);
249 if (!is_absolute_path(data.buf))
250 strbuf_addf(&path, "%s/", gitdir);
251 strbuf_addbuf(&path, &data);
252 strbuf_addstr(sb, real_path(path.buf));
31e26ebc 253 ret = 1;
4dc4e145
NTND
254 } else
255 strbuf_addstr(sb, gitdir);
256 strbuf_release(&data);
257 strbuf_release(&path);
31e26ebc 258 return ret;
4dc4e145 259}
d288a700 260
5f5608bc 261/*
ad1a382f 262 * Test if it looks like we're at a git directory.
5e7bfe25 263 * We want to see:
5f5608bc 264 *
790296fd 265 * - either an objects/ directory _or_ the proper
5f5608bc 266 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 267 * - a refs/ directory
8098a178 268 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
269 * a proper "ref:", or a regular file HEAD that has a properly
270 * formatted sha1 object name.
5f5608bc 271 */
b3256eb8 272int is_git_directory(const char *suspect)
5f5608bc 273{
1d186b6f
NTND
274 struct strbuf path = STRBUF_INIT;
275 int ret = 0;
276 size_t len;
ad1a382f 277
4dc4e145
NTND
278 /* Check worktree-related signatures */
279 strbuf_addf(&path, "%s/HEAD", suspect);
280 if (validate_headref(path.buf))
281 goto done;
282
283 strbuf_reset(&path);
284 get_common_dir(&path, suspect);
1d186b6f 285 len = path.len;
4dc4e145
NTND
286
287 /* Check non-worktree-related signatures */
ad1a382f
SP
288 if (getenv(DB_ENVIRONMENT)) {
289 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 290 goto done;
ad1a382f
SP
291 }
292 else {
4dc4e145 293 strbuf_setlen(&path, len);
1d186b6f
NTND
294 strbuf_addstr(&path, "/objects");
295 if (access(path.buf, X_OK))
296 goto done;
ad1a382f
SP
297 }
298
1d186b6f
NTND
299 strbuf_setlen(&path, len);
300 strbuf_addstr(&path, "/refs");
301 if (access(path.buf, X_OK))
302 goto done;
ad1a382f 303
1d186b6f
NTND
304 ret = 1;
305done:
306 strbuf_release(&path);
307 return ret;
5f5608bc
LT
308}
309
68025633
JS
310int is_inside_git_dir(void)
311{
e90fdc39
JS
312 if (inside_git_dir < 0)
313 inside_git_dir = is_inside_dir(get_git_dir());
314 return inside_git_dir;
892c41b9
ML
315}
316
892c41b9
ML
317int is_inside_work_tree(void)
318{
e90fdc39
JS
319 if (inside_work_tree < 0)
320 inside_work_tree = is_inside_dir(get_git_work_tree());
321 return inside_work_tree;
892c41b9
ML
322}
323
f3fa1838
JH
324void setup_work_tree(void)
325{
354e6534
JS
326 const char *work_tree, *git_dir;
327 static int initialized = 0;
328
329 if (initialized)
330 return;
fada7674
JK
331
332 if (work_tree_config_is_bogus)
333 die("unable to set up work tree using invalid config");
334
354e6534
JS
335 work_tree = get_git_work_tree();
336 git_dir = get_git_dir();
59f0f2f3 337 if (!is_absolute_path(git_dir))
e2a57aac 338 git_dir = real_path(get_git_dir());
59f0f2f3
MH
339 if (!work_tree || chdir(work_tree))
340 die("This operation must be run in a work tree");
0ed74813
NTND
341
342 /*
343 * Make sure subsequent git processes find correct worktree
344 * if $GIT_WORK_TREE is set relative
345 */
346 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
347 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
348
41894ae3 349 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 350 initialized = 1;
59f0f2f3
MH
351}
352
31e26ebc
NTND
353static int check_repo_format(const char *var, const char *value, void *cb)
354{
355 if (strcmp(var, "core.repositoryformatversion") == 0)
356 repository_format_version = git_config_int(var, value);
357 else if (strcmp(var, "core.sharedrepository") == 0)
358 shared_repository = git_config_perm(var, value);
359 return 0;
360}
361
337e51ce 362static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 363{
7d0fb0da
NTND
364 struct strbuf sb = STRBUF_INIT;
365 const char *repo_config;
31e26ebc 366 config_fn_t fn;
7d0fb0da 367 int ret = 0;
337e51ce 368
31e26ebc
NTND
369 if (get_common_dir(&sb, gitdir))
370 fn = check_repo_format;
371 else
372 fn = check_repository_format_version;
e61a509a
NTND
373 strbuf_addstr(&sb, "/config");
374 repo_config = sb.buf;
375
337e51ce
NTND
376 /*
377 * git_config() can't be used here because it calls git_pathdup()
378 * to get $GIT_CONFIG/config. That call will make setup_git_env()
379 * set git_dir to ".git".
380 *
381 * We are in gitdir setup, no git dir has been found useable yet.
382 * Use a gentler version of git_config() to check if this repo
383 * is a good one.
384 */
31e26ebc 385 git_config_early(fn, NULL, repo_config);
9459aa77
NTND
386 if (GIT_REPO_VERSION < repository_format_version) {
387 if (!nongit_ok)
388 die ("Expected git repo version <= %d, found %d",
389 GIT_REPO_VERSION, repository_format_version);
390 warning("Expected git repo version <= %d, found %d",
391 GIT_REPO_VERSION, repository_format_version);
392 warning("Please upgrade Git");
393 *nongit_ok = -1;
7d0fb0da 394 ret = -1;
9459aa77 395 }
7d0fb0da
NTND
396 strbuf_release(&sb);
397 return ret;
9459aa77
NTND
398}
399
23af91d1
NTND
400static void update_linked_gitdir(const char *gitfile, const char *gitdir)
401{
402 struct strbuf path = STRBUF_INIT;
403 struct stat st;
404
82fde87f 405 strbuf_addf(&path, "%s/gitdir", gitdir);
23af91d1 406 if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
91d54694 407 write_file(path.buf, "%s", gitfile);
23af91d1
NTND
408 strbuf_release(&path);
409}
410
b44ebb19
LH
411/*
412 * Try to read the location of the git directory from the .git file,
413 * return path to git directory if found.
a93bedad
EE
414 *
415 * On failure, if return_error_code is not NULL, return_error_code
416 * will be set to an error code and NULL will be returned. If
417 * return_error_code is NULL the function will die instead (for most
418 * cases).
b44ebb19 419 */
a93bedad 420const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 421{
921bdd96 422 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
423 int error_code = 0;
424 char *buf = NULL;
425 char *dir = NULL;
40c813e0 426 const char *slash;
b44ebb19
LH
427 struct stat st;
428 int fd;
b1905aea 429 ssize_t len;
b44ebb19 430
a93bedad
EE
431 if (stat(path, &st)) {
432 error_code = READ_GITFILE_ERR_STAT_FAILED;
433 goto cleanup_return;
434 }
435 if (!S_ISREG(st.st_mode)) {
436 error_code = READ_GITFILE_ERR_NOT_A_FILE;
437 goto cleanup_return;
438 }
921bdd96
EE
439 if (st.st_size > max_file_size) {
440 error_code = READ_GITFILE_ERR_TOO_LARGE;
441 goto cleanup_return;
442 }
b44ebb19 443 fd = open(path, O_RDONLY);
a93bedad
EE
444 if (fd < 0) {
445 error_code = READ_GITFILE_ERR_OPEN_FAILED;
446 goto cleanup_return;
447 }
b44ebb19
LH
448 buf = xmalloc(st.st_size + 1);
449 len = read_in_full(fd, buf, st.st_size);
450 close(fd);
a93bedad
EE
451 if (len != st.st_size) {
452 error_code = READ_GITFILE_ERR_READ_FAILED;
453 goto cleanup_return;
454 }
b44ebb19 455 buf[len] = '\0';
a93bedad
EE
456 if (!starts_with(buf, "gitdir: ")) {
457 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
458 goto cleanup_return;
459 }
b44ebb19
LH
460 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
461 len--;
a93bedad
EE
462 if (len < 9) {
463 error_code = READ_GITFILE_ERR_NO_PATH;
464 goto cleanup_return;
465 }
b44ebb19 466 buf[len] = '\0';
40c813e0
BK
467 dir = buf + 8;
468
469 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
470 size_t pathlen = slash+1 - path;
471 size_t dirlen = pathlen + len - 8;
472 dir = xmalloc(dirlen + 1);
473 strncpy(dir, path, pathlen);
474 strncpy(dir + pathlen, buf + 8, len - 8);
475 dir[dirlen] = '\0';
476 free(buf);
477 buf = dir;
478 }
a93bedad
EE
479 if (!is_git_directory(dir)) {
480 error_code = READ_GITFILE_ERR_NOT_A_REPO;
481 goto cleanup_return;
482 }
23af91d1 483 update_linked_gitdir(path, dir);
e2a57aac 484 path = real_path(dir);
40c813e0 485
a93bedad 486cleanup_return:
a93bedad
EE
487 if (return_error_code)
488 *return_error_code = error_code;
38ae8784 489 else if (error_code) {
a93bedad
EE
490 switch (error_code) {
491 case READ_GITFILE_ERR_STAT_FAILED:
492 case READ_GITFILE_ERR_NOT_A_FILE:
38ae8784
JK
493 /* non-fatal; follow return path */
494 break;
a93bedad
EE
495 case READ_GITFILE_ERR_OPEN_FAILED:
496 die_errno("Error opening '%s'", path);
921bdd96
EE
497 case READ_GITFILE_ERR_TOO_LARGE:
498 die("Too large to be a .git file: '%s'", path);
a93bedad
EE
499 case READ_GITFILE_ERR_READ_FAILED:
500 die("Error reading %s", path);
501 case READ_GITFILE_ERR_INVALID_FORMAT:
502 die("Invalid gitfile format: %s", path);
503 case READ_GITFILE_ERR_NO_PATH:
504 die("No path in gitfile: %s", path);
505 case READ_GITFILE_ERR_NOT_A_REPO:
506 die("Not a git repository: %s", dir);
507 default:
508 assert(0);
509 }
510 }
511
b44ebb19 512 free(buf);
38ae8784 513 return error_code ? NULL : path;
b44ebb19
LH
514}
515
e4e30347 516static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 517 struct strbuf *cwd,
b3f66fd3 518 int *nongit_ok)
e4e30347 519{
b3f66fd3
NTND
520 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
521 const char *worktree;
522 char *gitfile;
9b125da4 523 int offset;
e4e30347
JN
524
525 if (PATH_MAX - 40 < strlen(gitdirenv))
526 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 527
13d6ec91 528 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
529 if (gitfile) {
530 gitfile = xstrdup(gitfile);
531 gitdirenv = gitfile;
532 }
533
e4e30347
JN
534 if (!is_git_directory(gitdirenv)) {
535 if (nongit_ok) {
536 *nongit_ok = 1;
b3f66fd3 537 free(gitfile);
e4e30347
JN
538 return NULL;
539 }
540 die("Not a git repository: '%s'", gitdirenv);
541 }
b3f66fd3
NTND
542
543 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
544 free(gitfile);
545 return NULL;
e4e30347 546 }
b3f66fd3
NTND
547
548 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
549 if (work_tree_env)
550 set_git_work_tree(work_tree_env);
551 else if (is_bare_repository_cfg > 0) {
fada7674
JK
552 if (git_work_tree_cfg) {
553 /* #22.2, #30 */
554 warning("core.bare and core.worktree do not make sense");
555 work_tree_config_is_bogus = 1;
556 }
b3f66fd3
NTND
557
558 /* #18, #26 */
559 set_git_dir(gitdirenv);
560 free(gitfile);
e4e30347 561 return NULL;
b3f66fd3
NTND
562 }
563 else if (git_work_tree_cfg) { /* #6, #14 */
564 if (is_absolute_path(git_work_tree_cfg))
565 set_git_work_tree(git_work_tree_cfg);
566 else {
56b9f6e7 567 char *core_worktree;
b3f66fd3
NTND
568 if (chdir(gitdirenv))
569 die_errno("Could not chdir to '%s'", gitdirenv);
570 if (chdir(git_work_tree_cfg))
571 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 572 core_worktree = xgetcwd();
7333ed17 573 if (chdir(cwd->buf))
b3f66fd3
NTND
574 die_errno("Could not come back to cwd");
575 set_git_work_tree(core_worktree);
56b9f6e7 576 free(core_worktree);
b3f66fd3
NTND
577 }
578 }
2cd83d10
JK
579 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
580 /* #16d */
581 set_git_dir(gitdirenv);
582 free(gitfile);
583 return NULL;
584 }
b3f66fd3
NTND
585 else /* #2, #10 */
586 set_git_work_tree(".");
587
588 /* set_git_work_tree() must have been called by now */
589 worktree = get_git_work_tree();
590
591 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 592 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
593 set_git_dir(gitdirenv);
594 free(gitfile);
e4e30347 595 return NULL;
b3f66fd3 596 }
e4e30347 597
7333ed17 598 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 599 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 600 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
601 if (chdir(worktree))
602 die_errno("Could not chdir to '%s'", worktree);
7333ed17 603 strbuf_addch(cwd, '/');
b3f66fd3 604 free(gitfile);
7333ed17 605 return cwd->buf + offset;
93a00542 606 }
b3f66fd3
NTND
607
608 /* cwd outside worktree */
609 set_git_dir(gitdirenv);
610 free(gitfile);
611 return NULL;
93a00542
JN
612}
613
9951d3b3 614static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 615 struct strbuf *cwd, int offset,
9951d3b3 616 int *nongit_ok)
98937bef 617{
9951d3b3
NTND
618 if (check_repository_format_gently(gitdir, nongit_ok))
619 return NULL;
98937bef 620
4868b2ea
JN
621 /* --work-tree is set without --git-dir; use discovered one */
622 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 623 if (offset != cwd->len && !is_absolute_path(gitdir))
e2a57aac 624 gitdir = xstrdup(real_path(gitdir));
7333ed17 625 if (chdir(cwd->buf))
4868b2ea 626 die_errno("Could not come back to cwd");
7333ed17 627 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
628 }
629
9951d3b3
NTND
630 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
631 if (is_bare_repository_cfg > 0) {
7333ed17
RS
632 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
633 if (chdir(cwd->buf))
9951d3b3 634 die_errno("Could not come back to cwd");
98937bef 635 return NULL;
9951d3b3 636 }
98937bef 637
9951d3b3
NTND
638 /* #0, #1, #5, #8, #9, #12, #13 */
639 set_git_work_tree(".");
640 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
641 set_git_dir(gitdir);
98937bef 642 inside_git_dir = 0;
9951d3b3 643 inside_work_tree = 1;
7333ed17 644 if (offset == cwd->len)
98937bef
NTND
645 return NULL;
646
647 /* Make "offset" point to past the '/', and add a '/' at the end */
648 offset++;
7333ed17
RS
649 strbuf_addch(cwd, '/');
650 return cwd->buf + offset;
98937bef
NTND
651}
652
1cd8031b 653/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
654static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
655 int *nongit_ok)
68698da5
JN
656{
657 int root_len;
658
1cd8031b
NTND
659 if (check_repository_format_gently(".", nongit_ok))
660 return NULL;
661
2cd83d10
JK
662 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
663
4868b2ea
JN
664 /* --work-tree is set without --git-dir; use discovered one */
665 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
666 const char *gitdir;
667
7333ed17
RS
668 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
669 if (chdir(cwd->buf))
4868b2ea 670 die_errno("Could not come back to cwd");
7333ed17 671 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
672 }
673
68698da5 674 inside_git_dir = 1;
1cd8031b 675 inside_work_tree = 0;
7333ed17
RS
676 if (offset != cwd->len) {
677 if (chdir(cwd->buf))
8fc0ae80 678 die_errno("Cannot come back to cwd");
7333ed17
RS
679 root_len = offset_1st_component(cwd->buf);
680 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
681 set_git_dir(cwd->buf);
337e51ce 682 }
1cd8031b 683 else
68698da5 684 set_git_dir(".");
68698da5
JN
685 return NULL;
686}
687
f161edeb
JN
688static const char *setup_nongit(const char *cwd, int *nongit_ok)
689{
690 if (!nongit_ok)
691 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
692 if (chdir(cwd))
693 die_errno("Cannot come back to cwd");
694 *nongit_ok = 1;
695 return NULL;
696}
697
2565b43b 698static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
699{
700 struct stat buf;
2565b43b
CB
701 if (stat(path, &buf)) {
702 die_errno("failed to stat '%*s%s%s'",
703 prefix_len,
60c98d1e
JN
704 prefix ? prefix : "",
705 prefix ? "/" : "", path);
2565b43b 706 }
60c98d1e
JN
707 return buf.st_dev;
708}
709
9e2326c7 710/*
1b77d83c
MH
711 * A "string_list_each_func_t" function that canonicalizes an entry
712 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
713 * discards it if unusable. The presence of an empty entry in
714 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
715 * subsequent entries.
9e2326c7 716 */
1b77d83c 717static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 718 void *cb_data)
9e2326c7 719{
7ec30aaa 720 int *empty_entry_found = cb_data;
1b77d83c 721 char *ceil = item->string;
9e2326c7 722
7ec30aaa
MH
723 if (!*ceil) {
724 *empty_entry_found = 1;
9e2326c7 725 return 0;
7ec30aaa 726 } else if (!is_absolute_path(ceil)) {
9e2326c7 727 return 0;
7ec30aaa
MH
728 } else if (*empty_entry_found) {
729 /* Keep entry but do not canonicalize it */
730 return 1;
731 } else {
732 const char *real_path = real_path_if_valid(ceil);
733 if (!real_path)
734 return 0;
735 free(item->string);
736 item->string = xstrdup(real_path);
737 return 1;
738 }
9e2326c7
MH
739}
740
e90fdc39
JS
741/*
742 * We cannot decide in this function whether we are in the work tree or
743 * not, since the config can only be read _after_ this function was called.
744 */
a60645f9 745static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 746{
0454dd93 747 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 748 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
7333ed17 749 static struct strbuf cwd = STRBUF_INIT;
9951d3b3
NTND
750 const char *gitdirenv, *ret;
751 char *gitfile;
7333ed17 752 int offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
753 dev_t current_device = 0;
754 int one_filesystem = 1;
d288a700 755
3c8687a7
TA
756 /*
757 * We may have read an incomplete configuration before
758 * setting-up the git directory. If so, clear the cache so
759 * that the next queries to the configuration reload complete
760 * configuration (including the per-repo config file that we
761 * ignored previously).
762 */
763 git_config_clear();
764
af05d679
SG
765 /*
766 * Let's assume that we are in a git repository.
767 * If it turns out later that we are somewhere else, the value will be
768 * updated accordingly.
769 */
770 if (nongit_ok)
771 *nongit_ok = 0;
772
7333ed17 773 if (strbuf_getcwd(&cwd))
b3f66fd3 774 die_errno("Unable to read current working directory");
7333ed17 775 offset = cwd.len;
b3f66fd3 776
e90fdc39
JS
777 /*
778 * If GIT_DIR is set explicitly, we're not going
779 * to do any discovery, but we still do repository
780 * validation.
781 */
ad1a382f 782 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 783 if (gitdirenv)
7333ed17 784 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
d288a700 785
31171d9e 786 if (env_ceiling_dirs) {
7ec30aaa
MH
787 int empty_entry_found = 0;
788
31171d9e 789 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 790 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 791 canonicalize_ceiling_entry, &empty_entry_found);
7333ed17 792 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
31171d9e
MH
793 string_list_clear(&ceiling_dirs, 0);
794 }
795
7333ed17 796 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
17d778e7 797 ceil_offset = 1;
d288a700 798
892c41b9 799 /*
e90fdc39 800 * Test in the following order (relative to the cwd):
b44ebb19 801 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
802 * - .git/
803 * - ./ (bare)
b44ebb19 804 * - ../.git
e90fdc39
JS
805 * - ../.git/
806 * - ../ (bare)
807 * - ../../.git/
808 * etc.
892c41b9 809 */
cf87463e 810 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 811 if (one_filesystem)
2565b43b 812 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 813 for (;;) {
13d6ec91 814 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
815 if (gitfile)
816 gitdirenv = gitfile = xstrdup(gitfile);
817 else {
818 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
819 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
820 }
821
822 if (gitdirenv) {
823 ret = setup_discovered_git_dir(gitdirenv,
7333ed17 824 &cwd, offset,
9951d3b3
NTND
825 nongit_ok);
826 free(gitfile);
827 return ret;
828 }
829 free(gitfile);
830
68698da5 831 if (is_git_directory("."))
7333ed17 832 return setup_bare_git_dir(&cwd, offset, nongit_ok);
1cd8031b 833
2565b43b 834 offset_parent = offset;
7333ed17 835 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
2565b43b 836 if (offset_parent <= ceil_offset)
7333ed17 837 return setup_nongit(cwd.buf, nongit_ok);
8030e442 838 if (one_filesystem) {
7333ed17
RS
839 dev_t parent_device = get_device_or_die("..", cwd.buf,
840 offset);
60c98d1e 841 if (parent_device != current_device) {
8030e442 842 if (nongit_ok) {
7333ed17 843 if (chdir(cwd.buf))
8030e442
LD
844 die_errno("Cannot come back to cwd");
845 *nongit_ok = 1;
846 return NULL;
847 }
7333ed17 848 strbuf_setlen(&cwd, offset);
2565b43b 849 die("Not a git repository (or any parent up to mount point %s)\n"
7333ed17
RS
850 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
851 cwd.buf);
8030e442
LD
852 }
853 }
502ffe34 854 if (chdir("..")) {
7333ed17
RS
855 strbuf_setlen(&cwd, offset);
856 die_errno("Cannot change to '%s/..'", cwd.buf);
502ffe34 857 }
2565b43b 858 offset = offset_parent;
892c41b9 859 }
d288a700 860}
5e7bfe25 861
a60645f9
NTND
862const char *setup_git_directory_gently(int *nongit_ok)
863{
864 const char *prefix;
865
866 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 867 if (prefix)
a6f7f9a3 868 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 869 else
a6f7f9a3 870 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 871
f07d6a1a 872 if (startup_info) {
a60645f9 873 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
874 startup_info->prefix = prefix;
875 }
a60645f9
NTND
876 return prefix;
877}
878
94df2506
JH
879int git_config_perm(const char *var, const char *value)
880{
06cbe855
HO
881 int i;
882 char *endptr;
883
884 if (value == NULL)
885 return PERM_GROUP;
886
887 if (!strcmp(value, "umask"))
888 return PERM_UMASK;
889 if (!strcmp(value, "group"))
890 return PERM_GROUP;
891 if (!strcmp(value, "all") ||
892 !strcmp(value, "world") ||
893 !strcmp(value, "everybody"))
894 return PERM_EVERYBODY;
895
896 /* Parse octal numbers */
897 i = strtol(value, &endptr, 8);
898
899 /* If not an octal number, maybe true/false? */
900 if (*endptr != 0)
901 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
902
903 /*
904 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 905 * a chmod value to restrict to.
06cbe855
HO
906 */
907 switch (i) {
908 case PERM_UMASK: /* 0 */
909 return PERM_UMASK;
910 case OLD_PERM_GROUP: /* 1 */
911 return PERM_GROUP;
912 case OLD_PERM_EVERYBODY: /* 2 */
913 return PERM_EVERYBODY;
94df2506 914 }
06cbe855
HO
915
916 /* A filemode value was given: 0xxx */
917
918 if ((i & 0600) != 0600)
919 die("Problem with core.sharedRepository filemode value "
920 "(0%.3o).\nThe owner of files must always have "
921 "read and write permissions.", i);
922
923 /*
924 * Mask filemode value. Others can not get write permission.
925 * x flags for directories are handled separately.
926 */
5a688fe4 927 return -(i & 0666);
94df2506
JH
928}
929
ef90d6d4 930int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 931{
31e26ebc
NTND
932 int ret = check_repo_format(var, value, cb);
933 if (ret)
934 return ret;
935 if (strcmp(var, "core.bare") == 0) {
e90fdc39
JS
936 is_bare_repository_cfg = git_config_bool(var, value);
937 if (is_bare_repository_cfg == 1)
938 inside_work_tree = -1;
939 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
940 if (!value)
941 return config_error_nonbool(var);
8e0f7003 942 free(git_work_tree_cfg);
e90fdc39
JS
943 git_work_tree_cfg = xstrdup(value);
944 inside_work_tree = -1;
945 }
299726d5 946 return 0;
ab9cb76f
JH
947}
948
949int check_repository_format(void)
950{
337e51ce 951 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
952}
953
e1e5ec86
CB
954/*
955 * Returns the "prefix", a path to the current working directory
956 * relative to the work tree root, or NULL, if the current working
957 * directory is not a strict subdirectory of the work tree root. The
958 * prefix always ends with a '/' character.
959 */
5e7bfe25
JH
960const char *setup_git_directory(void)
961{
b3f66fd3 962 return setup_git_directory_gently(NULL);
5e7bfe25 963}
abc06822
FG
964
965const char *resolve_gitdir(const char *suspect)
966{
967 if (is_git_directory(suspect))
968 return suspect;
efc5fb6a 969 return read_gitfile(suspect);
abc06822 970}
1d999ddd
TR
971
972/* if any standard file descriptor is missing open it to /dev/null */
973void sanitize_stdfds(void)
974{
975 int fd = open("/dev/null", O_RDWR, 0);
976 while (fd != -1 && fd < 2)
977 fd = dup(fd);
978 if (fd == -1)
979 die_errno("open /dev/null or dup failed");
980 if (fd > 2)
981 close(fd);
982}
de0957ce
NTND
983
984int daemonize(void)
985{
986#ifdef NO_POSIX_GOODIES
987 errno = ENOSYS;
988 return -1;
989#else
990 switch (fork()) {
991 case 0:
992 break;
993 case -1:
994 die_errno("fork failed");
995 default:
996 exit(0);
997 }
998 if (setsid() == -1)
999 die_errno("setsid failed");
1000 close(0);
1001 close(1);
1002 close(2);
1003 sanitize_stdfds();
1004 return 0;
1005#endif
1006}