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 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 total = strlen(sanitized) + 1;
27 if (strncmp(sanitized, work_tree, len) ||
28 (sanitized[len] != '\0' && sanitized[len] != '/')) {
29 error_out:
30 die("'%s' is outside repository", orig);
31 }
32 if (sanitized[len] == '/')
33 len++;
34 memmove(sanitized, sanitized + len, total - len);
35 }
36 return sanitized;
37}
38/*
40 * Unlike prefix_path, this should be used if the named file does
41 * not have to interact with index entry; i.e. name of a random file
42 * on the filesystem.
43 */
44const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
45{
46 static char path[PATH_MAX];
47#ifndef WIN32
48 if (!pfx || !*pfx || is_absolute_path(arg))
49 return arg;
50 memcpy(path, pfx, pfx_len);
51 strcpy(path + pfx_len, arg);
52#else
53 char *p;
54 /* don't add prefix to absolute paths, but still replace '\' by '/' */
55 if (is_absolute_path(arg))
56 pfx_len = 0;
57 else
58 memcpy(path, pfx, pfx_len);
59 strcpy(path + pfx_len, arg);
60 for (p = path + pfx_len; *p; p++)
61 if (*p == '\\')
62 *p = '/';
63#endif
64 return path;
65}
66int check_filename(const char *prefix, const char *arg)
68{
69 const char *name;
70 struct stat st;
71 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
73 if (!lstat(name, &st))
74 return 1; /* file exists */
75 if (errno == ENOENT || errno == ENOTDIR)
76 return 0; /* file does not exist */
77 die_errno("failed to stat '%s'", arg);
78}
79/*
81 * Verify a filename that we got as an argument for a pathspec
82 * entry. Note that a filename that begins with "-" never verifies
83 * as true, because even if such a filename were to exist, we want
84 * it to be preceded by the "--" marker (or we want the user to
85 * use a format like "./-filename")
86 */
87void verify_filename(const char *prefix, const char *arg)
88{
89 if (*arg == '-')
90 die("bad flag '%s' used after filename", arg);
91 if (check_filename(prefix, arg))
92 return;
93 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
94 "Use '--' to separate paths from revisions", arg);
95}
96/*
98 * Opposite of the above: the command line did not have -- marker
99 * and we parsed the arg as a refname. It should not be interpretable
100 * as a filename.
101 */
102void verify_non_filename(const char *prefix, const char *arg)
103{
104 if (!is_inside_work_tree() || is_inside_git_dir())
105 return;
106 if (*arg == '-')
107 return; /* flag */
108 if (!check_filename(prefix, arg))
109 return;
110 die("ambiguous argument '%s': both revision and filename\n"
111 "Use '--' to separate filenames from revisions", arg);
112}
113const char **get_pathspec(const char *prefix, const char **pathspec)
115{
116 const char *entry = *pathspec;
117 const char **src, **dst;
118 int prefixlen;
119 if (!prefix && !entry)
121 return NULL;
122 if (!entry) {
124 static const char *spec[2];
125 spec[0] = prefix;
126 spec[1] = NULL;
127 return spec;
128 }
129 /* Otherwise we have to re-write the entries.. */
131 src = pathspec;
132 dst = pathspec;
133 prefixlen = prefix ? strlen(prefix) : 0;
134 while (*src) {
135 const char *p = prefix_path(prefix, prefixlen, *src);
136 *(dst++) = p;
137 src++;
138 }
139 *dst = NULL;
140 if (!*pathspec)
141 return NULL;
142 return pathspec;
143}
144/*
146 * Test if it looks like we're at a git directory.
147 * We want to see:
148 *
149 * - either an objects/ directory _or_ the proper
150 * GIT_OBJECT_DIRECTORY environment variable
151 * - a refs/ directory
152 * - either a HEAD symlink or a HEAD file that is formatted as
153 * a proper "ref:", or a regular file HEAD that has a properly
154 * formatted sha1 object name.
155 */
156static int is_git_directory(const char *suspect)
157{
158 char path[PATH_MAX];
159 size_t len = strlen(suspect);
160 if (PATH_MAX <= len + strlen("/objects"))
162 die("Too long path: %.*s", 60, suspect);
163 strcpy(path, suspect);
164 if (getenv(DB_ENVIRONMENT)) {
165 if (access(getenv(DB_ENVIRONMENT), X_OK))
166 return 0;
167 }
168 else {
169 strcpy(path + len, "/objects");
170 if (access(path, X_OK))
171 return 0;
172 }
173 strcpy(path + len, "/refs");
175 if (access(path, X_OK))
176 return 0;
177 strcpy(path + len, "/HEAD");
179 if (validate_headref(path))
180 return 0;
181 return 1;
183}
184int is_inside_git_dir(void)
186{
187 if (inside_git_dir < 0)
188 inside_git_dir = is_inside_dir(get_git_dir());
189 return inside_git_dir;
190}
191int is_inside_work_tree(void)
193{
194 if (inside_work_tree < 0)
195 inside_work_tree = is_inside_dir(get_git_work_tree());
196 return inside_work_tree;
197}
198/*
200 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
201 * The old behaviour (which we retain here) is to set the work tree root
202 * to the cwd, unless overridden by the config, the command line, or
203 * GIT_WORK_TREE.
204 */
205static const char *set_work_tree(const char *dir)
206{
207 char buffer[PATH_MAX + 1];
208 if (!getcwd(buffer, sizeof(buffer)))
210 die ("Could not get the current working directory");
211 git_work_tree_cfg = xstrdup(buffer);
212 inside_work_tree = 1;
213 return NULL;
215}
216void setup_work_tree(void)
218{
219 const char *work_tree, *git_dir;
220 static int initialized = 0;
221 if (initialized)
223 return;
224 work_tree = get_git_work_tree();
225 git_dir = get_git_dir();
226 if (!is_absolute_path(git_dir))
227 git_dir = make_absolute_path(git_dir);
228 if (!work_tree || chdir(work_tree))
229 die("This operation must be run in a work tree");
230 set_git_dir(make_relative_path(git_dir, work_tree));
231 initialized = 1;
232}
233static int check_repository_format_gently(int *nongit_ok)
235{
236 git_config(check_repository_format_version, NULL);
237 if (GIT_REPO_VERSION < repository_format_version) {
238 if (!nongit_ok)
239 die ("Expected git repo version <= %d, found %d",
240 GIT_REPO_VERSION, repository_format_version);
241 warning("Expected git repo version <= %d, found %d",
242 GIT_REPO_VERSION, repository_format_version);
243 warning("Please upgrade Git");
244 *nongit_ok = -1;
245 return -1;
246 }
247 return 0;
248}
249/*
251 * Try to read the location of the git directory from the .git file,
252 * return path to git directory if found.
253 */
254const char *read_gitfile_gently(const char *path)
255{
256 char *buf;
257 struct stat st;
258 int fd;
259 size_t len;
260 if (stat(path, &st))
262 return NULL;
263 if (!S_ISREG(st.st_mode))
264 return NULL;
265 fd = open(path, O_RDONLY);
266 if (fd < 0)
267 die_errno("Error opening '%s'", path);
268 buf = xmalloc(st.st_size + 1);
269 len = read_in_full(fd, buf, st.st_size);
270 close(fd);
271 if (len != st.st_size)
272 die("Error reading %s", path);
273 buf[len] = '\0';
274 if (prefixcmp(buf, "gitdir: "))
275 die("Invalid gitfile format: %s", path);
276 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
277 len--;
278 if (len < 9)
279 die("No path in gitfile: %s", path);
280 buf[len] = '\0';
281 if (!is_git_directory(buf + 8))
282 die("Not a git repository: %s", buf + 8);
283 path = make_absolute_path(buf + 8);
284 free(buf);
285 return path;
286}
287/*
289 * We cannot decide in this function whether we are in the work tree or
290 * not, since the config can only be read _after_ this function was called.
291 */
292const char *setup_git_directory_gently(int *nongit_ok)
293{
294 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
295 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
296 static char cwd[PATH_MAX+1];
297 const char *gitdirenv;
298 const char *gitfile_dir;
299 int len, offset, ceil_offset;
300 /*
302 * Let's assume that we are in a git repository.
303 * If it turns out later that we are somewhere else, the value will be
304 * updated accordingly.
305 */
306 if (nongit_ok)
307 *nongit_ok = 0;
308 /*
310 * If GIT_DIR is set explicitly, we're not going
311 * to do any discovery, but we still do repository
312 * validation.
313 */
314 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
315 if (gitdirenv) {
316 if (PATH_MAX - 40 < strlen(gitdirenv))
317 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
318 if (is_git_directory(gitdirenv)) {
319 static char buffer[1024 + 1];
320 const char *retval;
321 if (!work_tree_env) {
323 retval = set_work_tree(gitdirenv);
324 /* config may override worktree */
325 if (check_repository_format_gently(nongit_ok))
326 return NULL;
327 return retval;
328 }
329 if (check_repository_format_gently(nongit_ok))
330 return NULL;
331 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
332 get_git_work_tree());
333 if (!retval || !*retval)
334 return NULL;
335 set_git_dir(make_absolute_path(gitdirenv));
336 if (chdir(work_tree_env) < 0)
337 die_errno ("Could not chdir to '%s'", work_tree_env);
338 strcat(buffer, "/");
339 return retval;
340 }
341 if (nongit_ok) {
342 *nongit_ok = 1;
343 return NULL;
344 }
345 die("Not a git repository: '%s'", gitdirenv);
346 }
347 if (!getcwd(cwd, sizeof(cwd)-1))
349 die_errno("Unable to read current working directory");
350 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
352 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
353 ceil_offset = 1;
354 /*
356 * Test in the following order (relative to the cwd):
357 * - .git (file containing "gitdir: <path>")
358 * - .git/
359 * - ./ (bare)
360 * - ../.git
361 * - ../.git/
362 * - ../ (bare)
363 * - ../../.git/
364 * etc.
365 */
366 offset = len = strlen(cwd);
367 for (;;) {
368 gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
369 if (gitfile_dir) {
370 if (set_git_dir(gitfile_dir))
371 die("Repository setup failed");
372 break;
373 }
374 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
375 break;
376 if (is_git_directory(".")) {
377 inside_git_dir = 1;
378 if (!work_tree_env)
379 inside_work_tree = 0;
380 if (offset != len) {
381 cwd[offset] = '\0';
382 setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
383 } else
384 setenv(GIT_DIR_ENVIRONMENT, ".", 1);
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 git_work_tree_cfg = xstrndup(cwd, offset);
406 if (check_repository_format_gently(nongit_ok))
407 return NULL;
408 if (offset == len)
409 return NULL;
410 /* Make "offset" point to past the '/', and add a '/' at the end */
412 offset++;
413 cwd[len++] = '/';
414 cwd[len] = 0;
415 return cwd + offset;
416}
417int git_config_perm(const char *var, const char *value)
419{
420 int i;
421 char *endptr;
422 if (value == NULL)
424 return PERM_GROUP;
425 if (!strcmp(value, "umask"))
427 return PERM_UMASK;
428 if (!strcmp(value, "group"))
429 return PERM_GROUP;
430 if (!strcmp(value, "all") ||
431 !strcmp(value, "world") ||
432 !strcmp(value, "everybody"))
433 return PERM_EVERYBODY;
434 /* Parse octal numbers */
436 i = strtol(value, &endptr, 8);
437 /* If not an octal number, maybe true/false? */
439 if (*endptr != 0)
440 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
441 /*
443 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
444 * a chmod value to restrict to.
445 */
446 switch (i) {
447 case PERM_UMASK: /* 0 */
448 return PERM_UMASK;
449 case OLD_PERM_GROUP: /* 1 */
450 return PERM_GROUP;
451 case OLD_PERM_EVERYBODY: /* 2 */
452 return PERM_EVERYBODY;
453 }
454 /* A filemode value was given: 0xxx */
456 if ((i & 0600) != 0600)
458 die("Problem with core.sharedRepository filemode value "
459 "(0%.3o).\nThe owner of files must always have "
460 "read and write permissions.", i);
461 /*
463 * Mask filemode value. Others can not get write permission.
464 * x flags for directories are handled separately.
465 */
466 return -(i & 0666);
467}
468int check_repository_format_version(const char *var, const char *value, void *cb)
470{
471 if (strcmp(var, "core.repositoryformatversion") == 0)
472 repository_format_version = git_config_int(var, value);
473 else if (strcmp(var, "core.sharedrepository") == 0)
474 shared_repository = git_config_perm(var, value);
475 else if (strcmp(var, "core.bare") == 0) {
476 is_bare_repository_cfg = git_config_bool(var, value);
477 if (is_bare_repository_cfg == 1)
478 inside_work_tree = -1;
479 } else if (strcmp(var, "core.worktree") == 0) {
480 if (!value)
481 return config_error_nonbool(var);
482 free(git_work_tree_cfg);
483 git_work_tree_cfg = xstrdup(value);
484 inside_work_tree = -1;
485 }
486 return 0;
487}
488int check_repository_format(void)
490{
491 return check_repository_format_gently(NULL);
492}
493const char *setup_git_directory(void)
495{
496 const char *retval = setup_git_directory_gently(NULL);
497 /* If the work tree is not the default one, recompute prefix */
499 if (inside_work_tree < 0) {
500 static char buffer[PATH_MAX + 1];
501 char *rel;
502 if (retval && chdir(retval))
503 die_errno ("Could not jump back into original cwd");
504 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
505 if (rel && *rel && chdir(get_git_work_tree()))
506 die_errno ("Could not jump to working directory");
507 return rel && *rel ? strcat(rel, "/") : NULL;
508 }
509 return retval;
511}