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Commit | Line | Data |
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5b8e6f85 DP |
1 | #include "cache.h" |
2 | ||
90b4a71c JH |
3 | /* |
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. | |
7 | */ | |
8 | int is_directory(const char *path) | |
9 | { | |
10 | struct stat st; | |
11 | return (!stat(path, &st) && S_ISDIR(st.st_mode)); | |
12 | } | |
13 | ||
5b8e6f85 DP |
14 | /* We allow "recursive" symbolic links. Only within reason, though. */ |
15 | #define MAXDEPTH 5 | |
16 | ||
e2a57aac | 17 | /* |
038e55fe MH |
18 | * Return the real path (i.e., absolute path, with symlinks resolved |
19 | * and extra slashes removed) equivalent to the specified path. (If | |
20 | * you want an absolute path but don't mind links, use | |
21 | * absolute_path().) The return value is a pointer to a static | |
22 | * buffer. | |
23 | * | |
24 | * The input and all intermediate paths must be shorter than MAX_PATH. | |
25 | * The directory part of path (i.e., everything up to the last | |
26 | * dir_sep) must denote a valid, existing directory, but the last | |
27 | * component need not exist. If die_on_error is set, then die with an | |
28 | * informative error message if there is a problem. Otherwise, return | |
29 | * NULL on errors (without generating any output). | |
e2a57aac CMN |
30 | * |
31 | * If path is our buffer, then return path, as it's already what the | |
32 | * user wants. | |
33 | */ | |
038e55fe | 34 | static const char *real_path_internal(const char *path, int die_on_error) |
5b8e6f85 | 35 | { |
2fdb9ce0 | 36 | static struct strbuf sb = STRBUF_INIT; |
038e55fe | 37 | char *retval = NULL; |
d6052abc MH |
38 | |
39 | /* | |
40 | * If we have to temporarily chdir(), store the original CWD | |
41 | * here so that we can chdir() back to it at the end of the | |
42 | * function: | |
43 | */ | |
251277ac | 44 | struct strbuf cwd = STRBUF_INIT; |
d6052abc | 45 | |
5b8e6f85 DP |
46 | int depth = MAXDEPTH; |
47 | char *last_elem = NULL; | |
48 | struct stat st; | |
49 | ||
1d679de5 | 50 | /* We've already done it */ |
2fdb9ce0 | 51 | if (path == sb.buf) |
1d679de5 CMN |
52 | return path; |
53 | ||
038e55fe MH |
54 | if (!*path) { |
55 | if (die_on_error) | |
56 | die("The empty string is not a valid path"); | |
57 | else | |
58 | goto error_out; | |
59 | } | |
3efe5d1d | 60 | |
2fdb9ce0 RS |
61 | strbuf_reset(&sb); |
62 | strbuf_addstr(&sb, path); | |
5b8e6f85 DP |
63 | |
64 | while (depth--) { | |
2fdb9ce0 RS |
65 | if (!is_directory(sb.buf)) { |
66 | char *last_slash = find_last_dir_sep(sb.buf); | |
5b8e6f85 | 67 | if (last_slash) { |
5b8e6f85 | 68 | last_elem = xstrdup(last_slash + 1); |
2fdb9ce0 | 69 | strbuf_setlen(&sb, last_slash - sb.buf + 1); |
5b8e6f85 | 70 | } else { |
2fdb9ce0 RS |
71 | last_elem = xmemdupz(sb.buf, sb.len); |
72 | strbuf_reset(&sb); | |
5b8e6f85 DP |
73 | } |
74 | } | |
75 | ||
2fdb9ce0 | 76 | if (sb.len) { |
251277ac | 77 | if (!cwd.len && strbuf_getcwd(&cwd)) { |
038e55fe MH |
78 | if (die_on_error) |
79 | die_errno("Could not get current working directory"); | |
80 | else | |
81 | goto error_out; | |
82 | } | |
5b8e6f85 | 83 | |
2fdb9ce0 | 84 | if (chdir(sb.buf)) { |
038e55fe | 85 | if (die_on_error) |
2fdb9ce0 RS |
86 | die_errno("Could not switch to '%s'", |
87 | sb.buf); | |
038e55fe MH |
88 | else |
89 | goto error_out; | |
90 | } | |
91 | } | |
2fdb9ce0 | 92 | if (strbuf_getcwd(&sb)) { |
038e55fe MH |
93 | if (die_on_error) |
94 | die_errno("Could not get current working directory"); | |
95 | else | |
96 | goto error_out; | |
5b8e6f85 | 97 | } |
5b8e6f85 DP |
98 | |
99 | if (last_elem) { | |
2fdb9ce0 RS |
100 | if (sb.len && !is_dir_sep(sb.buf[sb.len - 1])) |
101 | strbuf_addch(&sb, '/'); | |
102 | strbuf_addstr(&sb, last_elem); | |
5b8e6f85 DP |
103 | free(last_elem); |
104 | last_elem = NULL; | |
105 | } | |
106 | ||
2fdb9ce0 RS |
107 | if (!lstat(sb.buf, &st) && S_ISLNK(st.st_mode)) { |
108 | struct strbuf next_sb = STRBUF_INIT; | |
109 | ssize_t len = strbuf_readlink(&next_sb, sb.buf, 0); | |
038e55fe MH |
110 | if (len < 0) { |
111 | if (die_on_error) | |
2fdb9ce0 RS |
112 | die_errno("Invalid symlink '%s'", |
113 | sb.buf); | |
038e55fe MH |
114 | else |
115 | goto error_out; | |
116 | } | |
2fdb9ce0 RS |
117 | strbuf_swap(&sb, &next_sb); |
118 | strbuf_release(&next_sb); | |
5b8e6f85 DP |
119 | } else |
120 | break; | |
121 | } | |
122 | ||
2fdb9ce0 | 123 | retval = sb.buf; |
038e55fe MH |
124 | error_out: |
125 | free(last_elem); | |
251277ac RS |
126 | if (cwd.len && chdir(cwd.buf)) |
127 | die_errno("Could not change back to '%s'", cwd.buf); | |
128 | strbuf_release(&cwd); | |
5b8e6f85 | 129 | |
038e55fe MH |
130 | return retval; |
131 | } | |
132 | ||
133 | const char *real_path(const char *path) | |
134 | { | |
135 | return real_path_internal(path, 1); | |
5b8e6f85 | 136 | } |
10c4c881 | 137 | |
e3e46cdb MH |
138 | const char *real_path_if_valid(const char *path) |
139 | { | |
140 | return real_path_internal(path, 0); | |
141 | } | |
142 | ||
10c4c881 JS |
143 | static const char *get_pwd_cwd(void) |
144 | { | |
145 | static char cwd[PATH_MAX + 1]; | |
146 | char *pwd; | |
147 | struct stat cwd_stat, pwd_stat; | |
148 | if (getcwd(cwd, PATH_MAX) == NULL) | |
149 | return NULL; | |
150 | pwd = getenv("PWD"); | |
151 | if (pwd && strcmp(pwd, cwd)) { | |
152 | stat(cwd, &cwd_stat); | |
7d092adc JS |
153 | if ((cwd_stat.st_dev || cwd_stat.st_ino) && |
154 | !stat(pwd, &pwd_stat) && | |
10c4c881 JS |
155 | pwd_stat.st_dev == cwd_stat.st_dev && |
156 | pwd_stat.st_ino == cwd_stat.st_ino) { | |
157 | strlcpy(cwd, pwd, PATH_MAX); | |
158 | } | |
159 | } | |
160 | return cwd; | |
161 | } | |
162 | ||
e2a57aac CMN |
163 | /* |
164 | * Use this to get an absolute path from a relative one. If you want | |
165 | * to resolve links, you should use real_path. | |
166 | * | |
167 | * If the path is already absolute, then return path. As the user is | |
168 | * never meant to free the return value, we're safe. | |
169 | */ | |
170 | const char *absolute_path(const char *path) | |
10c4c881 JS |
171 | { |
172 | static char buf[PATH_MAX + 1]; | |
173 | ||
a0601dc1 MH |
174 | if (!*path) { |
175 | die("The empty string is not a valid path"); | |
176 | } else if (is_absolute_path(path)) { | |
10c4c881 JS |
177 | if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) |
178 | die("Too long path: %.*s", 60, path); | |
179 | } else { | |
b248e950 ES |
180 | size_t len; |
181 | const char *fmt; | |
10c4c881 JS |
182 | const char *cwd = get_pwd_cwd(); |
183 | if (!cwd) | |
0721c314 | 184 | die_errno("Cannot determine the current working directory"); |
b248e950 | 185 | len = strlen(cwd); |
f1e835fa | 186 | fmt = (len > 0 && is_dir_sep(cwd[len - 1])) ? "%s%s" : "%s/%s"; |
b248e950 | 187 | if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX) |
10c4c881 JS |
188 | die("Too long path: %.*s", 60, path); |
189 | } | |
190 | return buf; | |
191 | } | |
06876284 DI |
192 | |
193 | /* | |
194 | * Unlike prefix_path, this should be used if the named file does | |
195 | * not have to interact with index entry; i.e. name of a random file | |
196 | * on the filesystem. | |
197 | */ | |
198 | const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) | |
199 | { | |
fc2b6214 | 200 | static struct strbuf path = STRBUF_INIT; |
380395d0 | 201 | #ifndef GIT_WINDOWS_NATIVE |
06876284 DI |
202 | if (!pfx_len || is_absolute_path(arg)) |
203 | return arg; | |
fc2b6214 AP |
204 | strbuf_reset(&path); |
205 | strbuf_add(&path, pfx, pfx_len); | |
206 | strbuf_addstr(&path, arg); | |
06876284 DI |
207 | #else |
208 | char *p; | |
209 | /* don't add prefix to absolute paths, but still replace '\' by '/' */ | |
fc2b6214 | 210 | strbuf_reset(&path); |
06876284 DI |
211 | if (is_absolute_path(arg)) |
212 | pfx_len = 0; | |
213 | else if (pfx_len) | |
fc2b6214 AP |
214 | strbuf_add(&path, pfx, pfx_len); |
215 | strbuf_addstr(&path, arg); | |
216 | for (p = path.buf + pfx_len; *p; p++) | |
06876284 DI |
217 | if (*p == '\\') |
218 | *p = '/'; | |
219 | #endif | |
fc2b6214 | 220 | return path.buf; |
06876284 | 221 | } |