1#include "cache.h"
2#include "dir.h"
3static int inside_git_dir = -1;
5static int inside_work_tree = -1;
6const char *prefix_path(const char *prefix, int len, const char *path)
8{
9 const char *orig = path;
10 char *sanitized = xmalloc(len + strlen(path) + 1);
11 if (is_absolute_path(orig))
12 strcpy(sanitized, path);
13 else {
14 if (len)
15 memcpy(sanitized, prefix, len);
16 strcpy(sanitized + len, path);
17 }
18 if (normalize_path_copy(sanitized, sanitized))
19 goto error_out;
20 if (is_absolute_path(orig)) {
21 size_t root_len, len, total;
22 const char *work_tree = get_git_work_tree();
23 if (!work_tree)
24 goto error_out;
25 len = strlen(work_tree);
26 root_len = offset_1st_component(work_tree);
27 total = strlen(sanitized) + 1;
28 if (strncmp(sanitized, work_tree, len) ||
29 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
30 error_out:
31 die("'%s' is outside repository", orig);
32 }
33 if (sanitized[len] == '/')
34 len++;
35 memmove(sanitized, sanitized + len, total - len);
36 }
37 return sanitized;
38}
39/*
41 * Unlike prefix_path, this should be used if the named file does
42 * not have to interact with index entry; i.e. name of a random file
43 * on the filesystem.
44 */
45const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
46{
47 static char path[PATH_MAX];
48#ifndef WIN32
49 if (!pfx || !*pfx || is_absolute_path(arg))
50 return arg;
51 memcpy(path, pfx, pfx_len);
52 strcpy(path + pfx_len, arg);
53#else
54 char *p;
55 /* don't add prefix to absolute paths, but still replace '\' by '/' */
56 if (is_absolute_path(arg))
57 pfx_len = 0;
58 else
59 memcpy(path, pfx, pfx_len);
60 strcpy(path + pfx_len, arg);
61 for (p = path + pfx_len; *p; p++)
62 if (*p == '\\')
63 *p = '/';
64#endif
65 return path;
66}
67int check_filename(const char *prefix, const char *arg)
69{
70 const char *name;
71 struct stat st;
72 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
74 if (!lstat(name, &st))
75 return 1; /* file exists */
76 if (errno == ENOENT || errno == ENOTDIR)
77 return 0; /* file does not exist */
78 die_errno("failed to stat '%s'", arg);
79}
80/*
82 * Verify a filename that we got as an argument for a pathspec
83 * entry. Note that a filename that begins with "-" never verifies
84 * as true, because even if such a filename were to exist, we want
85 * it to be preceded by the "--" marker (or we want the user to
86 * use a format like "./-filename")
87 */
88void verify_filename(const char *prefix, const char *arg)
89{
90 if (*arg == '-')
91 die("bad flag '%s' used after filename", arg);
92 if (check_filename(prefix, arg))
93 return;
94 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
95 "Use '--' to separate paths from revisions", arg);
96}
97/*
99 * Opposite of the above: the command line did not have -- marker
100 * and we parsed the arg as a refname. It should not be interpretable
101 * as a filename.
102 */
103void verify_non_filename(const char *prefix, const char *arg)
104{
105 if (!is_inside_work_tree() || is_inside_git_dir())
106 return;
107 if (*arg == '-')
108 return; /* flag */
109 if (!check_filename(prefix, arg))
110 return;
111 die("ambiguous argument '%s': both revision and filename\n"
112 "Use '--' to separate filenames from revisions", arg);
113}
114const char **get_pathspec(const char *prefix, const char **pathspec)
116{
117 const char *entry = *pathspec;
118 const char **src, **dst;
119 int prefixlen;
120 if (!prefix && !entry)
122 return NULL;
123 if (!entry) {
125 static const char *spec[2];
126 spec[0] = prefix;
127 spec[1] = NULL;
128 return spec;
129 }
130 /* Otherwise we have to re-write the entries.. */
132 src = pathspec;
133 dst = pathspec;
134 prefixlen = prefix ? strlen(prefix) : 0;
135 while (*src) {
136 const char *p = prefix_path(prefix, prefixlen, *src);
137 *(dst++) = p;
138 src++;
139 }
140 *dst = NULL;
141 if (!*pathspec)
142 return NULL;
143 return pathspec;
144}
145/*
147 * Test if it looks like we're at a git directory.
148 * We want to see:
149 *
150 * - either an objects/ directory _or_ the proper
151 * GIT_OBJECT_DIRECTORY environment variable
152 * - a refs/ directory
153 * - either a HEAD symlink or a HEAD file that is formatted as
154 * a proper "ref:", or a regular file HEAD that has a properly
155 * formatted sha1 object name.
156 */
157static int is_git_directory(const char *suspect)
158{
159 char path[PATH_MAX];
160 size_t len = strlen(suspect);
161 strcpy(path, suspect);
163 if (getenv(DB_ENVIRONMENT)) {
164 if (access(getenv(DB_ENVIRONMENT), X_OK))
165 return 0;
166 }
167 else {
168 strcpy(path + len, "/objects");
169 if (access(path, X_OK))
170 return 0;
171 }
172 strcpy(path + len, "/refs");
174 if (access(path, X_OK))
175 return 0;
176 strcpy(path + len, "/HEAD");
178 if (validate_headref(path))
179 return 0;
180 return 1;
182}
183int is_inside_git_dir(void)
185{
186 if (inside_git_dir < 0)
187 inside_git_dir = is_inside_dir(get_git_dir());
188 return inside_git_dir;
189}
190int is_inside_work_tree(void)
192{
193 if (inside_work_tree < 0)
194 inside_work_tree = is_inside_dir(get_git_work_tree());
195 return inside_work_tree;
196}
197/*
199 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
200 * The old behaviour (which we retain here) is to set the work tree root
201 * to the cwd, unless overridden by the config, the command line, or
202 * GIT_WORK_TREE.
203 */
204static const char *set_work_tree(const char *dir)
205{
206 char buffer[PATH_MAX + 1];
207 if (!getcwd(buffer, sizeof(buffer)))
209 die ("Could not get the current working directory");
210 git_work_tree_cfg = xstrdup(buffer);
211 inside_work_tree = 1;
212 return NULL;
214}
215void setup_work_tree(void)
217{
218 const char *work_tree, *git_dir;
219 static int initialized = 0;
220 if (initialized)
222 return;
223 work_tree = get_git_work_tree();
224 git_dir = get_git_dir();
225 if (!is_absolute_path(git_dir))
226 git_dir = make_absolute_path(git_dir);
227 if (!work_tree || chdir(work_tree))
228 die("This operation must be run in a work tree");
229 set_git_dir(make_relative_path(git_dir, work_tree));
230 initialized = 1;
231}
232static int check_repository_format_gently(int *nongit_ok)
234{
235 git_config(check_repository_format_version, NULL);
236 if (GIT_REPO_VERSION < repository_format_version) {
237 if (!nongit_ok)
238 die ("Expected git repo version <= %d, found %d",
239 GIT_REPO_VERSION, repository_format_version);
240 warning("Expected git repo version <= %d, found %d",
241 GIT_REPO_VERSION, repository_format_version);
242 warning("Please upgrade Git");
243 *nongit_ok = -1;
244 return -1;
245 }
246 return 0;
247}
248/*
250 * Try to read the location of the git directory from the .git file,
251 * return path to git directory if found.
252 */
253const char *read_gitfile_gently(const char *path)
254{
255 char *buf;
256 struct stat st;
257 int fd;
258 size_t len;
259 if (stat(path, &st))
261 return NULL;
262 if (!S_ISREG(st.st_mode))
263 return NULL;
264 fd = open(path, O_RDONLY);
265 if (fd < 0)
266 die_errno("Error opening '%s'", path);
267 buf = xmalloc(st.st_size + 1);
268 len = read_in_full(fd, buf, st.st_size);
269 close(fd);
270 if (len != st.st_size)
271 die("Error reading %s", path);
272 buf[len] = '\0';
273 if (prefixcmp(buf, "gitdir: "))
274 die("Invalid gitfile format: %s", path);
275 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
276 len--;
277 if (len < 9)
278 die("No path in gitfile: %s", path);
279 buf[len] = '\0';
280 if (!is_git_directory(buf + 8))
281 die("Not a git repository: %s", buf + 8);
282 path = make_absolute_path(buf + 8);
283 free(buf);
284 return path;
285}
286/*
288 * We cannot decide in this function whether we are in the work tree or
289 * not, since the config can only be read _after_ this function was called.
290 */
291const char *setup_git_directory_gently(int *nongit_ok)
292{
293 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
294 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
295 static char cwd[PATH_MAX+1];
296 const char *gitdirenv;
297 const char *gitfile_dir;
298 int len, offset, ceil_offset, root_len;
299 /*
301 * Let's assume that we are in a git repository.
302 * If it turns out later that we are somewhere else, the value will be
303 * updated accordingly.
304 */
305 if (nongit_ok)
306 *nongit_ok = 0;
307 /*
309 * If GIT_DIR is set explicitly, we're not going
310 * to do any discovery, but we still do repository
311 * validation.
312 */
313 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
314 if (gitdirenv) {
315 if (PATH_MAX - 40 < strlen(gitdirenv))
316 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
317 if (is_git_directory(gitdirenv)) {
318 static char buffer[1024 + 1];
319 const char *retval;
320 if (!work_tree_env) {
322 retval = set_work_tree(gitdirenv);
323 /* config may override worktree */
324 if (check_repository_format_gently(nongit_ok))
325 return NULL;
326 return retval;
327 }
328 if (check_repository_format_gently(nongit_ok))
329 return NULL;
330 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
331 get_git_work_tree());
332 if (!retval || !*retval)
333 return NULL;
334 set_git_dir(make_absolute_path(gitdirenv));
335 if (chdir(work_tree_env) < 0)
336 die_errno ("Could not chdir to '%s'", work_tree_env);
337 strcat(buffer, "/");
338 return retval;
339 }
340 if (nongit_ok) {
341 *nongit_ok = 1;
342 return NULL;
343 }
344 die("Not a git repository: '%s'", gitdirenv);
345 }
346 if (!getcwd(cwd, sizeof(cwd)-1))
348 die_errno("Unable to read current working directory");
349 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
351 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
352 ceil_offset = 1;
353 /*
355 * Test in the following order (relative to the cwd):
356 * - .git (file containing "gitdir: <path>")
357 * - .git/
358 * - ./ (bare)
359 * - ../.git
360 * - ../.git/
361 * - ../ (bare)
362 * - ../../.git/
363 * etc.
364 */
365 offset = len = strlen(cwd);
366 for (;;) {
367 gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
368 if (gitfile_dir) {
369 if (set_git_dir(gitfile_dir))
370 die("Repository setup failed");
371 break;
372 }
373 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
374 break;
375 if (is_git_directory(".")) {
376 inside_git_dir = 1;
377 if (!work_tree_env)
378 inside_work_tree = 0;
379 if (offset != len) {
380 root_len = offset_1st_component(cwd);
381 cwd[offset > root_len ? offset : root_len] = '\0';
382 set_git_dir(cwd);
383 } else
384 set_git_dir(".");
385 check_repository_format_gently(nongit_ok);
386 return NULL;
387 }
388 while (--offset > ceil_offset && cwd[offset] != '/');
389 if (offset <= ceil_offset) {
390 if (nongit_ok) {
391 if (chdir(cwd))
392 die_errno("Cannot come back to cwd");
393 *nongit_ok = 1;
394 return NULL;
395 }
396 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
397 }
398 if (chdir(".."))
399 die_errno("Cannot change to '%s/..'", cwd);
400 }
401 inside_git_dir = 0;
403 if (!work_tree_env)
404 inside_work_tree = 1;
405 root_len = offset_1st_component(cwd);
406 git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
407 if (check_repository_format_gently(nongit_ok))
408 return NULL;
409 if (offset == len)
410 return NULL;
411 /* Make "offset" point to past the '/', and add a '/' at the end */
413 offset++;
414 cwd[len++] = '/';
415 cwd[len] = 0;
416 return cwd + offset;
417}
418int git_config_perm(const char *var, const char *value)
420{
421 int i;
422 char *endptr;
423 if (value == NULL)
425 return PERM_GROUP;
426 if (!strcmp(value, "umask"))
428 return PERM_UMASK;
429 if (!strcmp(value, "group"))
430 return PERM_GROUP;
431 if (!strcmp(value, "all") ||
432 !strcmp(value, "world") ||
433 !strcmp(value, "everybody"))
434 return PERM_EVERYBODY;
435 /* Parse octal numbers */
437 i = strtol(value, &endptr, 8);
438 /* If not an octal number, maybe true/false? */
440 if (*endptr != 0)
441 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
442 /*
444 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
445 * a chmod value to restrict to.
446 */
447 switch (i) {
448 case PERM_UMASK: /* 0 */
449 return PERM_UMASK;
450 case OLD_PERM_GROUP: /* 1 */
451 return PERM_GROUP;
452 case OLD_PERM_EVERYBODY: /* 2 */
453 return PERM_EVERYBODY;
454 }
455 /* A filemode value was given: 0xxx */
457 if ((i & 0600) != 0600)
459 die("Problem with core.sharedRepository filemode value "
460 "(0%.3o).\nThe owner of files must always have "
461 "read and write permissions.", i);
462 /*
464 * Mask filemode value. Others can not get write permission.
465 * x flags for directories are handled separately.
466 */
467 return -(i & 0666);
468}
469int check_repository_format_version(const char *var, const char *value, void *cb)
471{
472 if (strcmp(var, "core.repositoryformatversion") == 0)
473 repository_format_version = git_config_int(var, value);
474 else if (strcmp(var, "core.sharedrepository") == 0)
475 shared_repository = git_config_perm(var, value);
476 else if (strcmp(var, "core.bare") == 0) {
477 is_bare_repository_cfg = git_config_bool(var, value);
478 if (is_bare_repository_cfg == 1)
479 inside_work_tree = -1;
480 } else if (strcmp(var, "core.worktree") == 0) {
481 if (!value)
482 return config_error_nonbool(var);
483 free(git_work_tree_cfg);
484 git_work_tree_cfg = xstrdup(value);
485 inside_work_tree = -1;
486 }
487 return 0;
488}
489int check_repository_format(void)
491{
492 return check_repository_format_gently(NULL);
493}
494const char *setup_git_directory(void)
496{
497 const char *retval = setup_git_directory_gently(NULL);
498 /* If the work tree is not the default one, recompute prefix */
500 if (inside_work_tree < 0) {
501 static char buffer[PATH_MAX + 1];
502 char *rel;
503 if (retval && chdir(retval))
504 die_errno ("Could not jump back into original cwd");
505 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
506 if (rel && *rel && chdir(get_git_work_tree()))
507 die_errno ("Could not jump to working directory");
508 return rel && *rel ? strcat(rel, "/") : NULL;
509 }
510 return retval;
512}