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0e23f538 TJ |
1 | /* |
2 | The software in this package is distributed under the GNU General | |
3 | Public License version 2 (with a special exception described below). | |
4 | ||
5 | A copy of GNU General Public License (GPL) is included in this distribution, | |
6 | in the file COPYING.GPL. | |
7 | ||
8 | As a special exception, if other files instantiate templates or use macros | |
9 | or inline functions from this file, or you compile this file and link it | |
10 | with other works to produce a work based on this file, this file | |
11 | does not by itself cause the resulting work to be covered | |
12 | by the GNU General Public License. | |
13 | ||
14 | However the source code for this file must still be made available | |
15 | in accordance with section (3) of the GNU General Public License. | |
16 | ||
17 | This exception does not invalidate any other reasons why a work based | |
18 | on this file might be covered by the GNU General Public License. | |
19 | */ | |
e93545dd GE |
20 | /*************************************************************************** |
21 | escape.cpp - escaping of strings | |
22 | ------------------- | |
23 | begin : Sun Nov 14 1999 | |
24 | copyright : (C) 1999 by Intra2net AG | |
e93545dd GE |
25 | ***************************************************************************/ |
26 | ||
6a93d84a | 27 | #include <list> |
e93545dd | 28 | #include <string> |
6a93d84a | 29 | #include <fstream> |
0a654ec0 | 30 | #include <sstream> |
e93545dd | 31 | #include <iostream> |
0a654ec0 | 32 | #include <stdexcept> |
e93545dd GE |
33 | |
34 | #include <sys/types.h> | |
35 | #include <sys/stat.h> | |
0a654ec0 | 36 | #include <dirent.h> |
e93545dd GE |
37 | #include <pwd.h> |
38 | #include <grp.h> | |
39 | #include <unistd.h> | |
0a654ec0 | 40 | #include <errno.h> |
5efd35b1 | 41 | #include <string.h> |
e93545dd | 42 | |
6a93d84a | 43 | #include <boost/scoped_array.hpp> |
deab8f59 | 44 | #include <boost/foreach.hpp> |
6a93d84a TJ |
45 | #include "filefunc.hxx" |
46 | #include "stringfunc.hxx" | |
47 | ||
a287a306 | 48 | namespace I2n |
6a93d84a | 49 | { |
e93545dd GE |
50 | |
51 | using namespace std; | |
52 | ||
6a93d84a TJ |
53 | /* |
54 | ** implementation of Stat | |
55 | */ | |
56 | ||
57 | Stat::Stat() | |
027e0a1c TJ |
58 | : FollowLinks(true) |
59 | , Valid(false) | |
0107a75b | 60 | { |
a287a306 | 61 | clear(); |
6a93d84a TJ |
62 | } // eo Stat::Stat() |
63 | ||
64 | ||
65 | Stat::Stat(const std::string& path, bool follow_links) | |
66 | { | |
67 | stat(path,follow_links); | |
68 | } // eo Stat::Stat(const std::string&,bool) | |
69 | ||
70 | ||
71 | Stat::~Stat() | |
72 | { | |
73 | } // eo Stat::~Stat() | |
74 | ||
75 | ||
76 | /** | |
77 | * @brief updates the internal data. | |
78 | * | |
79 | * In other words: stat()'s the file again. | |
80 | */ | |
81 | void Stat::recheck() | |
82 | { | |
a287a306 | 83 | if (! Path.empty()) |
6a93d84a | 84 | { |
96fe2dc5 GE |
85 | // pass a copy of Path: otherwise clear() would leave an empty reference |
86 | stat(string(Path), FollowLinks); | |
6a93d84a TJ |
87 | } |
88 | } // eo Stat::recheck() | |
89 | ||
90 | ||
91 | /** | |
92 | * @brief calls stat() or lstat() to get the information for the given path | |
93 | * and stores that information. | |
94 | * @param path the path which should be checked | |
95 | * @param follow_links determine if (symbalic) links should be followed. | |
96 | */ | |
97 | void Stat::stat(const std::string& path, bool follow_links) | |
98 | { | |
99 | clear(); | |
a287a306 TJ |
100 | Path= path; |
101 | FollowLinks= follow_links; | |
6a93d84a TJ |
102 | struct stat stat_info; |
103 | int res; | |
104 | res = ( follow_links ? ::stat(path.c_str(), &stat_info) : ::lstat(path.c_str(), &stat_info) ); | |
105 | if ( 0 == res ) | |
106 | { | |
a287a306 TJ |
107 | Device = stat_info.st_dev; |
108 | Inode = stat_info.st_ino; | |
109 | Mode = (stat_info.st_mode & ~(S_IFMT)); | |
110 | NumLinks = stat_info.st_nlink; | |
111 | Uid = stat_info.st_uid; | |
112 | Gid = stat_info.st_gid; | |
113 | DeviceType = stat_info.st_rdev; | |
114 | Size = stat_info.st_size; | |
115 | Atime = stat_info.st_atime; | |
116 | Mtime = stat_info.st_mtime; | |
117 | Ctime = stat_info.st_atime; | |
118 | ||
119 | IsLink= S_ISLNK( stat_info.st_mode ); | |
120 | IsRegular= S_ISREG( stat_info.st_mode ); | |
121 | IsDirectory= S_ISDIR( stat_info.st_mode ); | |
122 | IsCharacterDevice= S_ISCHR( stat_info.st_mode ); | |
6ab3bc95 | 123 | IsBlockDevice= S_ISBLK( stat_info.st_mode ); |
a287a306 TJ |
124 | IsFifo= S_ISFIFO( stat_info.st_mode ); |
125 | IsSocket= S_ISSOCK( stat_info.st_mode ); | |
6a93d84a | 126 | } |
a287a306 | 127 | Valid = (0 == res); |
6a93d84a | 128 | } // eo Stat::stat(const std::string&,bool) |
0a654ec0 | 129 | |
0107a75b | 130 | |
6a93d84a TJ |
131 | /** |
132 | * @brief clears the internal data. | |
133 | */ | |
134 | void Stat::clear() | |
135 | { | |
a287a306 TJ |
136 | Path.clear(); |
137 | Valid= false; | |
138 | ||
139 | Device = 0; | |
140 | Inode = 0; | |
141 | Mode = 0; | |
142 | NumLinks = 0; | |
143 | Uid = 0; | |
144 | Gid = 0; | |
145 | DeviceType = 0; | |
146 | Size = 0; | |
147 | Atime = 0; | |
148 | Mtime = 0; | |
149 | Ctime = 0; | |
150 | ||
151 | IsLink= false; | |
152 | IsRegular= false; | |
153 | IsDirectory= false; | |
154 | IsCharacterDevice= false; | |
155 | IsBlockDevice= false; | |
156 | IsFifo= false; | |
157 | IsSocket= false; | |
6a93d84a TJ |
158 | } // eo Stat::clear() |
159 | ||
160 | ||
161 | /** | |
162 | * @brief checks if another instance describes the same file. | |
163 | * @param rhs the other instance. | |
164 | * @return @a true iff the other instance describes the same file. | |
165 | * @note | |
166 | * The "same file" means that the files are located on the same device and use the same inode. | |
167 | * They might still have two different directory entries (different paths)! | |
168 | */ | |
a287a306 | 169 | bool Stat::is_same_as(const Stat& rhs) |
6a93d84a | 170 | { |
a287a306 TJ |
171 | return Valid and rhs.Valid |
172 | and ( Device == rhs.Device) | |
173 | and ( Inode == rhs.Inode); | |
174 | } // eo Stat::is_same_as(const Stat& rhs); | |
6a93d84a TJ |
175 | |
176 | ||
177 | /** | |
178 | * @brief checks if this and the other instance describe the same device. | |
179 | * @param rhs the other instance. | |
180 | * @return @a true if we and the other instance describe a device and the same device. | |
181 | * | |
182 | * "Same device" means that the devices have the same type and the same major and minor id. | |
183 | */ | |
a287a306 | 184 | bool Stat::is_same_device_as(const Stat& rhs) |
6a93d84a | 185 | { |
a287a306 TJ |
186 | return is_device() and rhs.is_device() |
187 | and ( IsBlockDevice == rhs.IsBlockDevice ) | |
188 | and ( IsCharacterDevice == rhs.IsCharacterDevice ) | |
189 | and ( DeviceType == rhs.DeviceType); | |
190 | } // eo Stat::is_same_device_as(const Stat&) | |
6a93d84a TJ |
191 | |
192 | /** | |
193 | * @brief check existence of a path. | |
194 | * @param path path which should be tested. | |
195 | * @return @a true iff path exists. | |
196 | */ | |
197 | bool path_exists(const std::string& path) | |
198 | { | |
199 | struct stat stat_info; | |
200 | int res = ::stat(path.c_str(), &stat_info); | |
201 | if (res) return false; | |
202 | return true; | |
203 | } // eo path_exists(const std::string&) | |
204 | ||
205 | /** | |
206 | * @brief check existence of a regular file. | |
207 | * @param path path which should be tested. | |
208 | * @return @a true if path exists and is a regular file (or a link pointing to a regular file). | |
209 | * @note this checks for regular files; not for the pure exitsnace of a path; use pathExists() for that. | |
210 | * @see pathExists | |
211 | */ | |
212 | bool file_exists(const std::string& path) | |
213 | { | |
214 | struct stat stat_info; | |
215 | int res = ::stat(path.c_str(), &stat_info); | |
216 | if (res) return false; | |
217 | return S_ISREG(stat_info.st_mode); | |
218 | } // eo file_exists(const std::string&) | |
219 | ||
220 | // TODO: Use Stat class | |
221 | /** | |
222 | * Get size of file | |
223 | * @param name filename to get size for | |
224 | * @return file size or -1 if file does not exist | |
225 | */ | |
226 | long file_size (const string &name) | |
e93545dd GE |
227 | { |
228 | long iReturn = -1; | |
0a654ec0 | 229 | |
e93545dd | 230 | struct stat statbuff; |
0a654ec0 | 231 | |
e93545dd GE |
232 | if (lstat(name.c_str(), &statbuff) < 0) |
233 | return -1; | |
234 | ||
235 | if (!S_ISREG(statbuff.st_mode)) | |
236 | return -1; | |
0a654ec0 | 237 | |
e93545dd GE |
238 | iReturn=statbuff.st_size; |
239 | ||
240 | return iReturn; | |
241 | } | |
242 | ||
6a93d84a TJ |
243 | /** |
244 | * @brief tests the last modification time stamp of a path. | |
245 | * @param path path which should be tested. | |
246 | * @return the last modification time or 0 if the path doen't exist. | |
247 | */ | |
a287a306 | 248 | time_t file_mtime(const std::string& path) |
e93545dd | 249 | { |
6a93d84a TJ |
250 | struct stat stat_info; |
251 | int res = ::stat(path.c_str(), &stat_info); | |
252 | if (res) return 0; | |
253 | return stat_info.st_mtime; | |
6ab3bc95 | 254 | } // eo file_mtime(const std::string&) |
e93545dd | 255 | |
e93545dd | 256 | |
6a93d84a TJ |
257 | /** |
258 | * @brief reads the contents of a directory. | |
259 | * @param path the path to the directory whose contents should be read. | |
260 | * @param[out] result the resulting list of names. | |
261 | * @param include_dot_names determines if dot-files should be included in the list. | |
262 | * @return @a true if reading the directory was succesful, @a false on error. | |
263 | */ | |
a287a306 | 264 | bool get_dir( |
6a93d84a TJ |
265 | const std::string& path, |
266 | std::vector< std::string >& result, | |
267 | bool include_dot_names ) | |
268 | { | |
269 | DIR* dir = ::opendir( path.c_str()); | |
270 | if (!dir) | |
271 | { | |
272 | return false; | |
273 | } | |
10c3af2d TJ |
274 | struct dirent store, *entry = NULL; |
275 | while (readdir_r(dir, &store, &entry) == 0 && entry != NULL) | |
e93545dd | 276 | { |
6a93d84a TJ |
277 | std::string name( entry->d_name ); |
278 | if (! include_dot_names && (name[0] == '.') ) | |
279 | { | |
280 | continue; | |
281 | } | |
282 | result.push_back( name ); | |
e93545dd | 283 | } |
6a93d84a TJ |
284 | ::closedir(dir); |
285 | return true; | |
6ab3bc95 | 286 | } // eo get_dir(const std::string&,std::vector< std::string >&,bool) |
6a93d84a TJ |
287 | |
288 | ||
289 | /** | |
290 | * @brief reads the contents of a directory | |
291 | * @param path the path to the directory whose contents should be read. | |
292 | * @param include_dot_names determines if dot-files should be included in the list. | |
293 | * @return the list of names (empty on error). | |
294 | */ | |
a287a306 | 295 | std::vector< std::string > get_dir(const std::string& path, bool include_dot_names ) |
6a93d84a TJ |
296 | { |
297 | std::vector< std::string > result; | |
a287a306 | 298 | get_dir(path,result,include_dot_names); |
6a93d84a | 299 | return result; |
6ab3bc95 | 300 | } // eo get_dir(const std::string&,bool) |
e93545dd | 301 | |
e93545dd | 302 | |
e93545dd | 303 | |
6a93d84a TJ |
304 | /** |
305 | * @brief removes a file from a filesystem. | |
306 | * @param path path to the file. | |
44725532 | 307 | * @return @a true if the unlink was successful. |
6a93d84a TJ |
308 | */ |
309 | bool unlink( const std::string& path ) | |
e93545dd | 310 | { |
6a93d84a TJ |
311 | int res = ::unlink( path.c_str() ); |
312 | return (res == 0); | |
313 | } // eo unlink(const std::string&) | |
314 | ||
e93545dd | 315 | |
e93545dd | 316 | |
6a93d84a TJ |
317 | /** |
318 | * @brief creates a symbolic link named @a link_name to @a target. | |
319 | * @param target the target the link should point to. | |
320 | * @param link_name the name of the link. | |
321 | * @param force if @a true, the (file or link) @a link_name is removed if it exists. | |
322 | * @return @a true iff the symlink was successfully created. | |
323 | */ | |
324 | bool symlink(const std::string& target, const std::string& link_name, bool force) | |
325 | { | |
326 | int res= -1; | |
327 | if (target.empty() or link_name.empty() or target == link_name) | |
328 | { | |
329 | // no, we don't do this! | |
e93545dd | 330 | return false; |
6a93d84a TJ |
331 | } |
332 | std::string n_target; | |
333 | if (target[0] == '/') // absolute target? | |
334 | { | |
335 | n_target= target; | |
336 | } | |
337 | else // relative target | |
338 | { | |
339 | // for stat'ing: prepend dir of link_name: | |
340 | n_target= dirname(link_name)+"/"+ target; | |
341 | } | |
342 | Stat target_stat(n_target, false); | |
343 | Stat link_name_stat(link_name, false); | |
344 | if (target_stat.exists() && link_name_stat.exists()) | |
345 | { | |
a287a306 TJ |
346 | if (link_name_stat.is_same_as(target_stat) |
347 | or link_name_stat.is_same_device_as(target_stat) ) | |
6a93d84a TJ |
348 | { |
349 | return false; | |
350 | } | |
351 | //TODO: more consistency checks?! | |
352 | } | |
353 | if (link_name_stat.exists()) | |
354 | { | |
355 | // the link name already exists. | |
356 | if (force) | |
357 | { | |
358 | // "force" as given, so try to remove the link_name: | |
359 | unlink(link_name); | |
360 | // update the stat: | |
361 | link_name_stat.recheck(); | |
362 | } | |
363 | } | |
364 | if (link_name_stat.exists()) | |
365 | { | |
366 | // well, if the link_name still exists; we cannot create that link: | |
367 | errno = EEXIST; | |
368 | return false; | |
369 | } | |
370 | res= ::symlink(target.c_str(), link_name.c_str()); | |
371 | return (0 == res); | |
372 | } // eo symlink(const std::string&,const std::string&,bool) | |
373 | ||
e93545dd | 374 | |
6a93d84a TJ |
375 | |
376 | /** | |
377 | * @brief reads the target of a symbolic link. | |
378 | * @param path path to the symbolic link | |
379 | * @return the target of the link or an empty string on error. | |
380 | */ | |
a287a306 | 381 | std::string read_link(const std::string& path) |
6a93d84a TJ |
382 | { |
383 | errno= 0; | |
384 | Stat stat(path,false); | |
a287a306 | 385 | if (!stat || !stat.is_link()) |
6a93d84a TJ |
386 | { |
387 | return std::string(); | |
388 | } | |
389 | int buffer_size= PATH_MAX+1 + 128; | |
390 | boost::scoped_array<char> buffer_ptr( new char[buffer_size] ); | |
391 | int res= ::readlink( path.c_str(), buffer_ptr.get(), buffer_size-1 ); | |
392 | if (res >= 0) | |
393 | { | |
394 | return std::string( buffer_ptr.get(), res ); | |
395 | } | |
396 | return std::string(); | |
6ab3bc95 | 397 | } // eo read_link(const std::string&) |
6a93d84a TJ |
398 | |
399 | ||
400 | ||
401 | /** | |
402 | * @brief returns content of a file as string. | |
403 | * | |
404 | * A simple (q'n'd) function for retrieving content of a file as string.<br> | |
405 | * Also able to read special (but regular) files which don't provide a size when stat'ed | |
406 | * (like files in the /proc filesystem). | |
407 | * | |
408 | * @param path path to the file. | |
409 | * @return the content of the file as string (empty if file could be opened). | |
410 | */ | |
a287a306 | 411 | std::string read_file(const std::string& path) |
6a93d84a TJ |
412 | { |
413 | Stat stat(path); | |
a287a306 | 414 | if (!stat.is_reg()) |
6a93d84a TJ |
415 | { |
416 | return std::string(); | |
417 | } | |
418 | std::ifstream f( path.c_str(), std::ios::in | std::ios::binary ); | |
419 | std::string result; | |
420 | if (f.is_open()) | |
421 | { | |
422 | // NOTE: there are cases where we don't know the correct size (/proc files...) | |
423 | // therefore we only use the size for reserving space if we know it, but don't | |
424 | // use it when reading the file! | |
425 | if (stat.size() > 0) | |
426 | { | |
427 | // if we know the size, we reserve enough space. | |
428 | result.reserve( stat.size() ); | |
429 | } | |
430 | char buffer[2048]; | |
431 | while (f.good()) | |
432 | { | |
433 | f.read(buffer, sizeof(buffer)); | |
434 | result.append(buffer, f.gcount()); | |
435 | } | |
436 | } | |
437 | return result; | |
6ab3bc95 | 438 | } // eo read_file(const std::string&) |
6a93d84a TJ |
439 | |
440 | ||
441 | /** | |
442 | * @brief writes a string to a file. | |
443 | * @param path path to the file | |
444 | * @param data the data which should be written into the file | |
71f7bfb8 | 445 | * @param trunc set the trunc flag when opening the file. Do not use for files in /proc and /sys |
6a93d84a TJ |
446 | * @return @a true if the data was written to the file. |
447 | * | |
448 | * A simple (q'n'd) function for writing a string to a file. | |
449 | */ | |
71f7bfb8 | 450 | bool write_file(const std::string& path, const std::string& data, bool trunc) |
6a93d84a | 451 | { |
71f7bfb8 GE |
452 | // set the correct openmode flags |
453 | std::ios_base::openmode flags = std::ios::out | std::ios::binary; | |
454 | if (trunc) | |
455 | flags |= std::ios::trunc; | |
456 | ||
457 | std::ofstream f( path.c_str(), flags); | |
6a93d84a TJ |
458 | if (f.good()) |
459 | { | |
460 | f.write( data.data(), data.size() ); | |
461 | return f.good(); | |
462 | } | |
e93545dd | 463 | else |
6a93d84a | 464 | { |
e93545dd | 465 | return false; |
6a93d84a | 466 | } |
6ab3bc95 | 467 | } // eo write_file(const std::string&,const std::string&) |
6a93d84a TJ |
468 | |
469 | ||
470 | /** | |
1a2fc4e8 TJ |
471 | * Copy file in 4k blocks from source to target. |
472 | * Overwrites the target if it already exists. | |
473 | * | |
474 | * On error the target file gets removed. | |
475 | * | |
476 | * @param src source file | |
477 | * @param dest target file | |
478 | * @return true if all is ok, false on error | |
479 | */ | |
480 | bool copy_file(const std::string& src, const std::string& dest) | |
481 | { | |
a1e7d2a7 GE |
482 | std::ifstream input( src.c_str(), std::ios::in | std::ios::binary ); |
483 | if (!input) | |
484 | return false; | |
485 | ||
486 | std::ofstream output( dest.c_str(), std::ios::out | std::ios::binary | std::ios::trunc); | |
487 | if (!output) | |
488 | return false; | |
489 | ||
490 | // Out of disc space? | |
491 | if (!copy_stream(input,output)) | |
492 | { | |
493 | output.close(); | |
494 | unlink(dest); | |
495 | return false; | |
496 | } | |
497 | ||
498 | return true; | |
499 | } | |
500 | ||
501 | /** | |
502 | * Copy streams in 4k blocks. | |
503 | * | |
504 | * @param is source stream | |
505 | * @param os target stream | |
506 | * @return true if all is ok, false on error | |
507 | */ | |
508 | bool copy_stream(std::istream& is, std::ostream& os) | |
509 | { | |
510 | if (!is) | |
1a2fc4e8 TJ |
511 | return false; |
512 | ||
a1e7d2a7 | 513 | if (!os) |
1a2fc4e8 TJ |
514 | return false; |
515 | ||
516 | char buffer[4096]; | |
a1e7d2a7 | 517 | while (is.good()) |
1a2fc4e8 | 518 | { |
a1e7d2a7 GE |
519 | is.read(buffer, sizeof(buffer)); |
520 | os.write(buffer, is.gcount()); | |
521 | ||
522 | // Can't write? | |
523 | if (!os.good()) | |
1a2fc4e8 | 524 | return false; |
1a2fc4e8 TJ |
525 | } |
526 | ||
527 | return true; | |
528 | } | |
529 | ||
530 | /** | |
6a93d84a TJ |
531 | * @brief returns the filename part of a path (last component) |
532 | * @param path the path. | |
533 | * @return the last component of the path. | |
534 | */ | |
535 | std::string basename(const std::string& path) | |
536 | { | |
537 | std::string::size_type pos= path.rfind('/'); | |
538 | if (pos != std::string::npos) | |
539 | { | |
540 | return path.substr(pos+1); | |
541 | } | |
542 | return path; | |
543 | } // eo basename(const std::string&) | |
544 | ||
545 | ||
546 | /** | |
547 | * @brief returns the directory part of a path. | |
548 | * @param path the path. | |
549 | * @return the directory part of the path. | |
550 | */ | |
551 | std::string dirname(const std::string& path) | |
552 | { | |
553 | std::string::size_type pos= path.rfind('/'); | |
554 | if (pos != std::string::npos) | |
555 | { | |
556 | std::string result(path,0,pos); | |
557 | if (result.empty()) | |
558 | { | |
559 | return "."; | |
560 | } | |
561 | return result; | |
562 | } | |
563 | return "."; | |
564 | } // eo dirname(const std::string&) | |
565 | ||
566 | ||
567 | /** | |
568 | * @brief normalizes a path. | |
569 | * | |
570 | * This method removes empty and "." elements. | |
571 | * It also resolves ".." parts by removing previous path elements if possible. | |
572 | * Leading ".." elements are preserved when a relative path was given; else they are removed. | |
573 | * Trailing slashes are removed. | |
574 | * | |
575 | * @param path the path which should be normalized. | |
576 | * @return the normalized path. | |
577 | */ | |
578 | ||
a287a306 | 579 | std::string normalize_path(const std::string& path) |
6a93d84a TJ |
580 | { |
581 | if (path.empty()) | |
582 | { | |
583 | return std::string(); | |
584 | } | |
585 | // remember if the given path was absolute since this information vanishes when | |
586 | // we split the path (since we split with omitting empty parts...) | |
587 | bool is_absolute= (path[0]=='/'); | |
588 | std::list< std::string > parts; | |
589 | std::list< std::string > result_parts; | |
590 | ||
6ab3bc95 | 591 | split_string(path,parts,"/",true); |
6a93d84a TJ |
592 | |
593 | for(std::list< std::string >::const_iterator it_parts= parts.begin(); | |
594 | it_parts != parts.end(); | |
595 | ++it_parts) | |
596 | { | |
597 | std::string part(*it_parts); //convenience.. | |
598 | if (part == std::string(".") ) | |
599 | { | |
600 | // single dot is "current path"; ignore! | |
601 | continue; | |
602 | } | |
603 | if (part == std::string("..") ) | |
604 | { | |
605 | // double dot is "one part back" | |
606 | if (result_parts.empty()) | |
607 | { | |
608 | if (is_absolute) | |
609 | { | |
610 | // ignore since we cannot move behind / on absolute paths... | |
611 | } | |
612 | else | |
613 | { | |
614 | // on relative path, we need to store the "..": | |
615 | result_parts.push_back(part); | |
616 | } | |
617 | } | |
618 | else if (result_parts.back() == std::string("..") ) | |
619 | { | |
620 | // if last element was already "..", we need to store the new one again... | |
621 | // (PS: no need for "absolute" check; this can only be the case on relative path) | |
622 | result_parts.push_back(part); | |
623 | } | |
624 | else | |
625 | { | |
626 | // remove last element. | |
627 | result_parts.pop_back(); | |
628 | } | |
629 | continue; | |
630 | } | |
631 | result_parts.push_back(part); | |
632 | } | |
633 | std::string result; | |
634 | if (is_absolute) | |
635 | { | |
636 | result= "/"; | |
637 | } | |
6ab3bc95 | 638 | result+= join_string(result_parts,"/"); |
6a93d84a | 639 | return result; |
6ab3bc95 | 640 | } // eo normalize_path(const std::string&) |
6a93d84a TJ |
641 | |
642 | ||
643 | /** | |
f002679a GE |
644 | * @brief calls fsync on a given directory to sync all it's metadata |
645 | * @param path the path of the directory. | |
646 | * @return true if successful | |
647 | */ | |
648 | bool dirsync(const std::string& path) | |
649 | { | |
650 | // sync the directory the file is in | |
651 | DIR* dir=opendir(path.c_str()); | |
652 | if (dir == NULL) | |
653 | return false; | |
654 | ||
655 | int ret=fsync(dirfd(dir)); | |
656 | ||
657 | closedir(dir); | |
658 | ||
659 | return (ret==0); | |
660 | } | |
661 | ||
662 | /** | |
6a93d84a TJ |
663 | * @brief changes the file(/path) mode. |
664 | * @param path the path to change the mode for. | |
665 | * @param mode the new file mode. | |
666 | * @return @a true iff the file mode was sucessfully changed. | |
667 | */ | |
668 | bool chmod(const std::string& path, int mode) | |
669 | { | |
670 | int res= ::chmod(path.c_str(), mode); | |
671 | return (res==0); | |
672 | } // eo chmod(const std::string&,int) | |
673 | ||
674 | ||
675 | /** | |
676 | * @brief changed the owner of a file(/path) | |
677 | * @param path the path to change the owner for. | |
678 | * @param user the new file owner. | |
679 | * @param group the new file group. | |
680 | * @return @a true iff the file owner was succesfully changed. | |
681 | * | |
682 | * @note | |
683 | * the validity of user and group within the system is not checked. | |
684 | * This is intentional since this way we can use id's which are not assigned. | |
685 | */ | |
a287a306 | 686 | bool chown(const std::string& path, const I2n::User& user, const I2n::Group& group) |
6a93d84a | 687 | { |
a287a306 | 688 | uid_t uid= user.Uid; |
6a93d84a | 689 | if (uid<0) return false; |
a287a306 TJ |
690 | gid_t gid= group.Gid; |
691 | if (gid<0) gid= user.Gid; | |
6a93d84a TJ |
692 | if (gid<0) return false; |
693 | int res= ::chown( path.c_str(), uid, gid); | |
694 | return (res==0); | |
695 | } // eo chown(const std::string&,const User&,const Group&) | |
e93545dd | 696 | |
0a654ec0 TJ |
697 | /** |
698 | * Recursive delete of files and directories | |
699 | * @param path File or directory to delete | |
44725532 | 700 | * @param error Will contain the error if the return value is false [optional] |
0a654ec0 TJ |
701 | * @return true on success, false otherwise |
702 | */ | |
703 | bool recursive_delete(const std::string &path, std::string *error) | |
704 | { | |
705 | bool rtn = true; | |
706 | ||
707 | try { | |
708 | struct stat my_stat; | |
709 | if (stat(path.c_str(), &my_stat) != 0) { | |
710 | throw runtime_error("can't stat " + path); | |
711 | } | |
712 | ||
713 | if (S_ISDIR(my_stat.st_mode)) { | |
714 | DIR *dir = opendir(path.c_str()); | |
715 | if (!dir) { | |
716 | throw runtime_error("can't open directory " + path); | |
717 | } | |
718 | ||
10c3af2d TJ |
719 | struct dirent store, *entry = NULL; |
720 | while (readdir_r(dir, &store, &entry) == 0 && entry != NULL) | |
721 | { | |
0a654ec0 TJ |
722 | string filename = entry->d_name; |
723 | if (filename == "." || filename == "..") { | |
724 | continue; | |
725 | } | |
726 | ||
727 | // Delete subdir or file. | |
728 | rtn = recursive_delete(path + "/" + filename, error); | |
729 | if (rtn == false) { | |
730 | break; | |
731 | } | |
732 | } | |
733 | ||
734 | closedir(dir); | |
44725532 | 735 | if (!rmdir(path)) { |
0a654ec0 TJ |
736 | throw runtime_error("can't remove directory " + path); |
737 | } | |
738 | } else { | |
44725532 | 739 | if (!unlink(path)) { |
0a654ec0 TJ |
740 | throw runtime_error("can't unlink " + path); |
741 | } | |
742 | } | |
743 | } catch (exception &e) { | |
744 | if (error) { | |
745 | ostringstream out; | |
746 | out << e.what() << " (" << strerror(errno) << ")"; | |
747 | *error = out.str(); | |
748 | } | |
749 | rtn = false; | |
750 | } catch (...) { | |
751 | if (error) { | |
752 | ostringstream out; | |
753 | out << "unknown error (" << strerror(errno) << ")"; | |
754 | *error = out.str(); | |
755 | } | |
756 | rtn = false; | |
757 | } | |
e93545dd | 758 | |
0a654ec0 | 759 | return rtn; |
6ab3bc95 | 760 | } // eo recursive_delete(const std::string&,std::string*) |
6a93d84a | 761 | |
faf8475b TJ |
762 | /** |
763 | Create a unique temporary directory from path_template. | |
764 | @param Path template. The last six characters must be XXXXXX. | |
44725532 | 765 | @param error Will contain the error if the return value is false [optional] |
faf8475b TJ |
766 | @return Name of new directory or empty string on error. |
767 | */ | |
44725532 | 768 | std::string mkdtemp(const std::string &path_template, std::string *error) |
faf8475b TJ |
769 | { |
770 | boost::scoped_array<char> buf( new char[path_template.size()+1] ); | |
771 | path_template.copy(buf.get(), path_template.size()); | |
772 | buf[path_template.size()]=0; | |
773 | ||
774 | char *unique_dir = ::mkdtemp(buf.get()); | |
775 | if (!unique_dir) | |
44725532 TJ |
776 | { |
777 | if (error) | |
778 | *error = strerror(errno); | |
faf8475b | 779 | return ""; |
44725532 | 780 | } |
faf8475b TJ |
781 | |
782 | // Scoped pointer is still valid | |
783 | return std::string(unique_dir); | |
784 | } | |
785 | ||
44725532 TJ |
786 | /** |
787 | Create directory | |
788 | @param path Path to create | |
789 | @param error Will contain the error if the return value is false [optional] | |
790 | @return True on success, false on error | |
791 | */ | |
792 | bool mkdir(const std::string &path, const mode_t &mode, std::string *error) | |
793 | { | |
794 | if ( ::mkdir(path.c_str(), mode) == 0) | |
795 | return true; | |
796 | ||
797 | if (error) | |
798 | *error = strerror(errno); | |
799 | return false; | |
800 | } | |
801 | ||
802 | /** | |
803 | Remove directory | |
804 | @param path Path to removed | |
805 | @param error Will contain the error if the return value is false [optional] | |
806 | @return True on successs, false otherwise | |
807 | */ | |
808 | bool rmdir(const std::string &path, std::string *error) | |
809 | { | |
810 | if ( ::rmdir(path.c_str() ) == 0) | |
811 | return true; | |
812 | ||
813 | if (error) | |
814 | *error = strerror(errno); | |
815 | return false; | |
816 | } | |
817 | ||
818 | /// Small helper class for scoped free | |
819 | class scoped_C_free | |
820 | { | |
821 | public: | |
822 | scoped_C_free(void *ptr) | |
823 | : pointer_to_free(ptr) | |
824 | { | |
825 | } | |
826 | ||
827 | ~scoped_C_free() | |
828 | { | |
829 | free (pointer_to_free); | |
830 | pointer_to_free = NULL; | |
831 | } | |
832 | ||
833 | private: | |
834 | void *pointer_to_free; | |
835 | }; | |
836 | ||
837 | /** | |
838 | Get current working directory | |
839 | @return Current working directory. Empty string on error. | |
840 | */ | |
841 | std::string getcwd() | |
842 | { | |
843 | char *cwd = ::getcwd(NULL, 0); | |
844 | if (!cwd) | |
845 | return ""; | |
846 | ||
847 | // Make deallocation of cwd exception safe | |
848 | scoped_C_free holder(cwd); | |
849 | ||
850 | string current_dir(cwd); | |
851 | return current_dir; | |
852 | } | |
853 | ||
854 | /** | |
855 | Change current working directory | |
856 | @param path Path to change to | |
857 | @param error Will contain the error if the return value is false [optional] | |
858 | @return True on successs, false otherwise | |
859 | */ | |
860 | bool chdir(const std::string &path, std::string *error) | |
861 | { | |
862 | if ( ::chdir(path.c_str() ) == 0) | |
863 | return true; | |
864 | ||
865 | if (error) | |
866 | *error = strerror(errno); | |
867 | return false; | |
868 | } | |
faf8475b | 869 | |
901e2943 TJ |
870 | /** |
871 | Set file mode creation mask | |
872 | @param mask Creation mask | |
873 | @return Previous creation mask (function call always succeeds) | |
874 | */ | |
875 | mode_t umask(mode_t mask) | |
876 | { | |
877 | return ::umask(mask); | |
878 | } | |
879 | ||
deab8f59 CH |
880 | |
881 | /** | |
882 | * @brief Remove unlisted files | |
883 | * | |
884 | * @param directory Direcotry to look for files | |
885 | * @param keep_files List of files or directories to keep | |
886 | * @param prefix Filename prefix to match. Empty prefix matches all. | |
887 | * | |
888 | * @return bool True if the directory was scanned, false on error (directory not found, permission denied) | |
889 | **/ | |
890 | bool remove_unlisted_files(const std::string &directory, | |
891 | const std::set<std::string> &keep_files, | |
892 | const std::string &prefix) | |
893 | { | |
894 | std::vector<std::string> content; | |
895 | if (!get_dir(directory, content, false)) | |
896 | return false; | |
897 | ||
898 | bool all_fine = true; | |
899 | BOOST_FOREACH(const std::string &file, content) | |
900 | { | |
901 | // Check for filename prefix (if any) | |
902 | if (!prefix.empty() && file.find(prefix) != 0) | |
903 | continue; | |
904 | ||
905 | // Check if file is whitelisted | |
906 | if (keep_files.find(file) != keep_files.end()) | |
907 | continue; | |
908 | ||
909 | // Try to unlink file. (Continue on error) | |
910 | if (!unlink(directory + "/" + file)) | |
911 | all_fine = false; | |
912 | } | |
913 | ||
914 | return all_fine; | |
915 | } | |
916 | ||
917 | ||
6ab3bc95 | 918 | } // eo namespace I2n |