4 * Do not use this for inspecting *tracked* content. When path is a
5 * symlink to a directory, we do not want to say it is a directory when
6 * dealing with tracked content in the working tree.
8 int is_directory(const char *path)
11 return (!stat(path, &st) && S_ISDIR(st.st_mode));
14 /* We allow "recursive" symbolic links. Only within reason, though. */
18 * Use this to get the real path, i.e. resolve links. If you want an
19 * absolute path but don't mind links, use absolute_path.
21 * If path is our buffer, then return path, as it's already what the
24 const char *real_path(const char *path)
26 static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
31 char *last_elem = NULL;
34 /* We've already done it */
35 if (path == buf || path == next_buf)
38 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
39 die ("Too long path: %.*s", 60, path);
42 if (!is_directory(buf)) {
43 char *last_slash = strrchr(buf, '/');
46 last_elem = xstrdup(last_slash + 1);
48 last_elem = xstrdup(buf);
54 if (!*cwd && !getcwd(cwd, sizeof(cwd)))
55 die_errno ("Could not get current working directory");
58 die_errno ("Could not switch to '%s'", buf);
60 if (!getcwd(buf, PATH_MAX))
61 die_errno ("Could not get current working directory");
64 size_t len = strlen(buf);
65 if (len + strlen(last_elem) + 2 > PATH_MAX)
66 die ("Too long path name: '%s/%s'",
68 if (len && buf[len-1] != '/')
70 strcpy(buf + len, last_elem);
75 if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
76 ssize_t len = readlink(buf, next_buf, PATH_MAX);
78 die_errno ("Invalid symlink '%s'", buf);
80 die("symbolic link too long: %s", buf);
83 buf_index = 1 - buf_index;
84 next_buf = bufs[buf_index];
89 if (*cwd && chdir(cwd))
90 die_errno ("Could not change back to '%s'", cwd);
95 static const char *get_pwd_cwd(void)
97 static char cwd[PATH_MAX + 1];
99 struct stat cwd_stat, pwd_stat;
100 if (getcwd(cwd, PATH_MAX) == NULL)
103 if (pwd && strcmp(pwd, cwd)) {
104 stat(cwd, &cwd_stat);
105 if ((cwd_stat.st_dev || cwd_stat.st_ino) &&
106 !stat(pwd, &pwd_stat) &&
107 pwd_stat.st_dev == cwd_stat.st_dev &&
108 pwd_stat.st_ino == cwd_stat.st_ino) {
109 strlcpy(cwd, pwd, PATH_MAX);
116 * Use this to get an absolute path from a relative one. If you want
117 * to resolve links, you should use real_path.
119 * If the path is already absolute, then return path. As the user is
120 * never meant to free the return value, we're safe.
122 const char *absolute_path(const char *path)
124 static char buf[PATH_MAX + 1];
126 if (is_absolute_path(path)) {
127 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
128 die("Too long path: %.*s", 60, path);
132 const char *cwd = get_pwd_cwd();
134 die_errno("Cannot determine the current working directory");
136 fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s";
137 if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX)
138 die("Too long path: %.*s", 60, path);