1 /* Work around rename bugs in some systems.
3 Copyright (C) 2001, 2002, 2003, 2005, 2006, 2009 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Volker Borchert, Eric Blake. */
27 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
28 /* The mingw rename has problems with trailing slashes; it also
29 requires use of native Windows calls to allow atomic renames over
34 # define WIN32_LEAN_AND_MEAN
37 /* Rename the file SRC to DST. This replacement is necessary on
38 Windows, on which the system rename function will not replace
41 rpl_rename (char const *src, char const *dst)
45 /* MoveFileEx works if SRC is a directory without any flags,
46 but fails with MOVEFILE_REPLACE_EXISTING, so try without
48 if (MoveFileEx (src, dst, 0))
51 /* Retry with MOVEFILE_REPLACE_EXISTING if the move failed
52 * due to the destination already existing. */
53 error = GetLastError ();
54 if (error == ERROR_FILE_EXISTS || error == ERROR_ALREADY_EXISTS)
56 if (MoveFileEx (src, dst, MOVEFILE_REPLACE_EXISTING))
59 error = GetLastError ();
64 case ERROR_FILE_NOT_FOUND:
65 case ERROR_PATH_NOT_FOUND:
66 case ERROR_BAD_PATHNAME:
71 case ERROR_ACCESS_DENIED:
72 case ERROR_SHARING_VIOLATION:
76 case ERROR_OUTOFMEMORY:
80 case ERROR_CURRENT_DIRECTORY:
84 case ERROR_NOT_SAME_DEVICE:
88 case ERROR_WRITE_PROTECT:
92 case ERROR_WRITE_FAULT:
93 case ERROR_READ_FAULT:
94 case ERROR_GEN_FAILURE:
98 case ERROR_HANDLE_DISK_FULL:
100 case ERROR_DISK_TOO_FRAGMENTED:
104 case ERROR_FILE_EXISTS:
105 case ERROR_ALREADY_EXISTS:
109 case ERROR_BUFFER_OVERFLOW:
110 case ERROR_FILENAME_EXCED_RANGE:
111 errno = ENAMETOOLONG;
114 case ERROR_INVALID_NAME:
115 case ERROR_DELETE_PENDING:
116 errno = EPERM; /* ? */
119 # ifndef ERROR_FILE_TOO_LARGE
120 /* This value is documented but not defined in all versions of windows.h. */
121 # define ERROR_FILE_TOO_LARGE 223
123 case ERROR_FILE_TOO_LARGE:
135 #else /* ! W32 platform */
141 # include <sys/stat.h>
143 # include "dirname.h"
144 # include "same-inode.h"
146 /* Rename the file SRC to DST, fixing any trailing slash bugs. */
149 rpl_rename (char const *src, char const *dst)
151 size_t src_len = strlen (src);
152 size_t dst_len = strlen (dst);
153 char *src_temp = (char *) src;
154 char *dst_temp = (char *) dst;
158 int rename_errno = ENOTDIR;
162 if (!src_len || !dst_len)
163 return rename (src, dst); /* Let strace see the ENOENT failure. */
165 # if RENAME_DEST_EXISTS_BUG
167 char *src_base = last_component (src);
168 char *dst_base = last_component (dst);
169 if (*src_base == '.')
171 size_t len = base_len (src_base);
172 if (len == 1 || (len == 2 && src_base[1] == '.'))
178 if (*dst_base == '.')
180 size_t len = base_len (dst_base);
181 if (len == 1 || (len == 2 && dst_base[1] == '.'))
188 # endif /* RENAME_DEST_EXISTS_BUG */
190 src_slash = src[src_len - 1] == '/';
191 dst_slash = dst[dst_len - 1] == '/';
193 # if !RENAME_DEST_EXISTS_BUG
194 /* If there are no trailing slashes, then trust the native
195 implementation unless we also suspect issues with hard link
197 if (!src_slash && !dst_slash)
198 return rename (src, dst);
199 # endif /* !RENAME_DEST_EXISTS_BUG */
201 /* Presence of a trailing slash requires directory semantics. If
202 the source does not exist, or if the destination cannot be turned
203 into a directory, give up now. Otherwise, strip trailing slashes
204 before calling rename. */
205 if (lstat (src, &src_st))
207 if (lstat (dst, &dst_st))
209 if (errno != ENOENT || (!S_ISDIR (src_st.st_mode) && dst_slash))
214 if (S_ISDIR (dst_st.st_mode) != S_ISDIR (src_st.st_mode))
216 errno = S_ISDIR (dst_st.st_mode) ? EISDIR : ENOTDIR;
219 # if RENAME_DEST_EXISTS_BUG
220 if (SAME_INODE (src_st, dst_st))
222 # endif /* RENAME_DEST_EXISTS_BUG */
225 # if RENAME_TRAILING_SLASH_SOURCE_BUG || RENAME_DEST_EXISTS_BUG
226 /* If the only bug was that a trailing slash was allowed on a
227 non-existing file destination, as in Solaris 10, then we've
228 already covered that situation. But if there is any problem with
229 a trailing slash on an existing source or destination, as in
230 Solaris 9, or if a directory can overwrite a symlink, as on
231 Cygwin 1.5, or if directories cannot be created with trailing
232 slash, as on NetBSD 1.6, then we must strip the offending slash
233 and check that we have not encountered a symlink instead of a
236 Stripping a trailing slash interferes with POSIX semantics, where
237 rename behavior on a symlink with a trailing slash operates on
238 the corresponding target directory. We prefer the GNU semantics
239 of rejecting any use of a symlink with trailing slash, but do not
240 enforce them, since Solaris 10 is able to obey POSIX semantics
241 and there might be clients expecting it, as counter-intuitive as
244 Technically, we could also follow the POSIX behavior by chasing a
245 readlink trail, but that is harder to implement. */
248 src_temp = strdup (src);
251 /* Rather than rely on strdup-posix, we set errno ourselves. */
252 rename_errno = ENOMEM;
255 strip_trailing_slashes (src_temp);
256 if (lstat (src_temp, &src_st))
258 rename_errno = errno;
261 if (S_ISLNK (src_st.st_mode))
266 dst_temp = strdup (dst);
269 rename_errno = ENOMEM;
272 strip_trailing_slashes (dst_temp);
273 if (lstat (dst_temp, &dst_st))
277 rename_errno = errno;
281 else if (S_ISLNK (dst_st.st_mode))
284 # endif /* RENAME_TRAILING_SLASH_SOURCE_BUG || RENAME_DEST_EXISTS_BUG */
286 ret_val = rename (src_temp, dst_temp);
287 rename_errno = errno;
293 errno = rename_errno;
296 #endif /* ! W32 platform */