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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 | ||
05b458c1 BW |
14 | /* removes the last path component from 'path' except if 'path' is root */ |
15 | static void strip_last_component(struct strbuf *path) | |
16 | { | |
17 | size_t offset = offset_1st_component(path->buf); | |
18 | size_t len = path->len; | |
19 | ||
20 | /* Find start of the last component */ | |
21 | while (offset < len && !is_dir_sep(path->buf[len - 1])) | |
22 | len--; | |
23 | /* Skip sequences of multiple path-separators */ | |
24 | while (offset < len && is_dir_sep(path->buf[len - 1])) | |
25 | len--; | |
26 | ||
27 | strbuf_setlen(path, len); | |
28 | } | |
29 | ||
30 | /* get (and remove) the next component in 'remaining' and place it in 'next' */ | |
31 | static void get_next_component(struct strbuf *next, struct strbuf *remaining) | |
32 | { | |
33 | char *start = NULL; | |
34 | char *end = NULL; | |
35 | ||
36 | strbuf_reset(next); | |
37 | ||
38 | /* look for the next component */ | |
39 | /* Skip sequences of multiple path-separators */ | |
40 | for (start = remaining->buf; is_dir_sep(*start); start++) | |
41 | ; /* nothing */ | |
42 | /* Find end of the path component */ | |
43 | for (end = start; *end && !is_dir_sep(*end); end++) | |
44 | ; /* nothing */ | |
45 | ||
46 | strbuf_add(next, start, end - start); | |
47 | /* remove the component from 'remaining' */ | |
48 | strbuf_remove(remaining, 0, end - remaining->buf); | |
49 | } | |
50 | ||
e9a379c3 JS |
51 | /* copies root part from remaining to resolved, canonicalizing it on the way */ |
52 | static void get_root_part(struct strbuf *resolved, struct strbuf *remaining) | |
53 | { | |
54 | int offset = offset_1st_component(remaining->buf); | |
55 | ||
56 | strbuf_reset(resolved); | |
57 | strbuf_add(resolved, remaining->buf, offset); | |
58 | #ifdef GIT_WINDOWS_NATIVE | |
59 | convert_slashes(resolved->buf); | |
60 | #endif | |
61 | strbuf_remove(remaining, 0, offset); | |
62 | } | |
63 | ||
5b8e6f85 | 64 | /* We allow "recursive" symbolic links. Only within reason, though. */ |
7aeb81f1 BW |
65 | #ifndef MAXSYMLINKS |
66 | #define MAXSYMLINKS 32 | |
67 | #endif | |
5b8e6f85 | 68 | |
e2a57aac | 69 | /* |
038e55fe MH |
70 | * Return the real path (i.e., absolute path, with symlinks resolved |
71 | * and extra slashes removed) equivalent to the specified path. (If | |
72 | * you want an absolute path but don't mind links, use | |
a1ae4841 | 73 | * absolute_path().) Places the resolved realpath in the provided strbuf. |
038e55fe | 74 | * |
038e55fe MH |
75 | * The directory part of path (i.e., everything up to the last |
76 | * dir_sep) must denote a valid, existing directory, but the last | |
77 | * component need not exist. If die_on_error is set, then die with an | |
78 | * informative error message if there is a problem. Otherwise, return | |
79 | * NULL on errors (without generating any output). | |
e2a57aac | 80 | */ |
a1ae4841 BW |
81 | char *strbuf_realpath(struct strbuf *resolved, const char *path, |
82 | int die_on_error) | |
5b8e6f85 | 83 | { |
05b458c1 BW |
84 | struct strbuf remaining = STRBUF_INIT; |
85 | struct strbuf next = STRBUF_INIT; | |
86 | struct strbuf symlink = STRBUF_INIT; | |
038e55fe | 87 | char *retval = NULL; |
05b458c1 | 88 | int num_symlinks = 0; |
5b8e6f85 DP |
89 | struct stat st; |
90 | ||
038e55fe MH |
91 | if (!*path) { |
92 | if (die_on_error) | |
93 | die("The empty string is not a valid path"); | |
94 | else | |
95 | goto error_out; | |
96 | } | |
3efe5d1d | 97 | |
e9a379c3 JS |
98 | strbuf_addstr(&remaining, path); |
99 | get_root_part(resolved, &remaining); | |
5b8e6f85 | 100 | |
e9a379c3 | 101 | if (!resolved->len) { |
05b458c1 | 102 | /* relative path; can use CWD as the initial resolved path */ |
a1ae4841 | 103 | if (strbuf_getcwd(resolved)) { |
05b458c1 BW |
104 | if (die_on_error) |
105 | die_errno("unable to get current working directory"); | |
106 | else | |
107 | goto error_out; | |
108 | } | |
05b458c1 BW |
109 | } |
110 | ||
111 | /* Iterate over the remaining path components */ | |
112 | while (remaining.len > 0) { | |
113 | get_next_component(&next, &remaining); | |
114 | ||
115 | if (next.len == 0) { | |
116 | continue; /* empty component */ | |
117 | } else if (next.len == 1 && !strcmp(next.buf, ".")) { | |
118 | continue; /* '.' component */ | |
119 | } else if (next.len == 2 && !strcmp(next.buf, "..")) { | |
120 | /* '..' component; strip the last path component */ | |
a1ae4841 | 121 | strip_last_component(resolved); |
05b458c1 | 122 | continue; |
5b8e6f85 DP |
123 | } |
124 | ||
05b458c1 | 125 | /* append the next component and resolve resultant path */ |
a1ae4841 BW |
126 | if (!is_dir_sep(resolved->buf[resolved->len - 1])) |
127 | strbuf_addch(resolved, '/'); | |
128 | strbuf_addbuf(resolved, &next); | |
05b458c1 | 129 | |
a1ae4841 | 130 | if (lstat(resolved->buf, &st)) { |
05b458c1 BW |
131 | /* error out unless this was the last component */ |
132 | if (errno != ENOENT || remaining.len) { | |
038e55fe | 133 | if (die_on_error) |
05b458c1 | 134 | die_errno("Invalid path '%s'", |
a1ae4841 | 135 | resolved->buf); |
038e55fe MH |
136 | else |
137 | goto error_out; | |
138 | } | |
05b458c1 BW |
139 | } else if (S_ISLNK(st.st_mode)) { |
140 | ssize_t len; | |
141 | strbuf_reset(&symlink); | |
5b8e6f85 | 142 | |
05b458c1 | 143 | if (num_symlinks++ > MAXSYMLINKS) { |
0b9864aa BW |
144 | errno = ELOOP; |
145 | ||
038e55fe | 146 | if (die_on_error) |
05b458c1 BW |
147 | die("More than %d nested symlinks " |
148 | "on path '%s'", MAXSYMLINKS, path); | |
038e55fe MH |
149 | else |
150 | goto error_out; | |
151 | } | |
5b8e6f85 | 152 | |
a1ae4841 | 153 | len = strbuf_readlink(&symlink, resolved->buf, |
05b458c1 | 154 | st.st_size); |
038e55fe MH |
155 | if (len < 0) { |
156 | if (die_on_error) | |
2fdb9ce0 | 157 | die_errno("Invalid symlink '%s'", |
a1ae4841 | 158 | resolved->buf); |
038e55fe MH |
159 | else |
160 | goto error_out; | |
161 | } | |
05b458c1 BW |
162 | |
163 | if (is_absolute_path(symlink.buf)) { | |
164 | /* absolute symlink; set resolved to root */ | |
e9a379c3 | 165 | get_root_part(resolved, &symlink); |
05b458c1 BW |
166 | } else { |
167 | /* | |
168 | * relative symlink | |
169 | * strip off the last component since it will | |
170 | * be replaced with the contents of the symlink | |
171 | */ | |
a1ae4841 | 172 | strip_last_component(resolved); |
05b458c1 BW |
173 | } |
174 | ||
175 | /* | |
176 | * if there are still remaining components to resolve | |
177 | * then append them to symlink | |
178 | */ | |
179 | if (remaining.len) { | |
180 | strbuf_addch(&symlink, '/'); | |
181 | strbuf_addbuf(&symlink, &remaining); | |
182 | } | |
183 | ||
184 | /* | |
185 | * use the symlink as the remaining components that | |
64127575 | 186 | * need to be resolved |
05b458c1 BW |
187 | */ |
188 | strbuf_swap(&symlink, &remaining); | |
189 | } | |
5b8e6f85 DP |
190 | } |
191 | ||
a1ae4841 | 192 | retval = resolved->buf; |
05b458c1 | 193 | |
038e55fe | 194 | error_out: |
05b458c1 BW |
195 | strbuf_release(&remaining); |
196 | strbuf_release(&next); | |
197 | strbuf_release(&symlink); | |
5b8e6f85 | 198 | |
a1ae4841 BW |
199 | if (!retval) |
200 | strbuf_reset(resolved); | |
201 | ||
038e55fe MH |
202 | return retval; |
203 | } | |
204 | ||
205 | const char *real_path(const char *path) | |
206 | { | |
a1ae4841 BW |
207 | static struct strbuf realpath = STRBUF_INIT; |
208 | return strbuf_realpath(&realpath, path, 1); | |
5b8e6f85 | 209 | } |
10c4c881 | 210 | |
e3e46cdb MH |
211 | const char *real_path_if_valid(const char *path) |
212 | { | |
a1ae4841 BW |
213 | static struct strbuf realpath = STRBUF_INIT; |
214 | return strbuf_realpath(&realpath, path, 0); | |
e3e46cdb MH |
215 | } |
216 | ||
ce83eadd | 217 | char *real_pathdup(const char *path, int die_on_error) |
72417640 BW |
218 | { |
219 | struct strbuf realpath = STRBUF_INIT; | |
220 | char *retval = NULL; | |
221 | ||
ce83eadd | 222 | if (strbuf_realpath(&realpath, path, die_on_error)) |
72417640 BW |
223 | retval = strbuf_detach(&realpath, NULL); |
224 | ||
225 | strbuf_release(&realpath); | |
226 | ||
227 | return retval; | |
228 | } | |
229 | ||
e2a57aac CMN |
230 | /* |
231 | * Use this to get an absolute path from a relative one. If you want | |
232 | * to resolve links, you should use real_path. | |
e2a57aac CMN |
233 | */ |
234 | const char *absolute_path(const char *path) | |
10c4c881 | 235 | { |
679eebe2 RS |
236 | static struct strbuf sb = STRBUF_INIT; |
237 | strbuf_reset(&sb); | |
238 | strbuf_add_absolute_path(&sb, path); | |
239 | return sb.buf; | |
10c4c881 | 240 | } |
06876284 | 241 | |
b1edb40f RS |
242 | char *absolute_pathdup(const char *path) |
243 | { | |
244 | struct strbuf sb = STRBUF_INIT; | |
245 | strbuf_add_absolute_path(&sb, path); | |
246 | return strbuf_detach(&sb, NULL); | |
247 | } | |
248 | ||
e4da43b1 | 249 | char *prefix_filename(const char *pfx, const char *arg) |
06876284 | 250 | { |
e4da43b1 | 251 | struct strbuf path = STRBUF_INIT; |
116fb64e JK |
252 | size_t pfx_len = pfx ? strlen(pfx) : 0; |
253 | ||
af10e8b1 JK |
254 | if (!pfx_len) |
255 | ; /* nothing to prefix */ | |
256 | else if (is_absolute_path(arg)) | |
06876284 | 257 | pfx_len = 0; |
af10e8b1 | 258 | else |
fc2b6214 | 259 | strbuf_add(&path, pfx, pfx_len); |
af10e8b1 | 260 | |
fc2b6214 | 261 | strbuf_addstr(&path, arg); |
af10e8b1 | 262 | #ifdef GIT_WINDOWS_NATIVE |
8e9b2080 | 263 | convert_slashes(path.buf + pfx_len); |
06876284 | 264 | #endif |
e4da43b1 | 265 | return strbuf_detach(&path, NULL); |
06876284 | 266 | } |