/* Provide a stub lchown function for systems that lack it.
- Copyright (C) 1998, 1999, 2002, 2004, 2006, 2007, 2009 Free
- Software Foundation, Inc.
+ Copyright (C) 1998-1999, 2002, 2004, 2006-2007, 2009-2010 Free Software
+ Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <unistd.h>
#include <errno.h>
+#include <stdbool.h>
#include <string.h>
#include <sys/stat.h>
int
rpl_lchown (const char *file, uid_t uid, gid_t gid)
{
- size_t len = strlen (file);
- if (len && file[len - 1] == '/')
- return chown (file, uid, gid);
- return lchown (file, uid, gid);
+ bool stat_valid = false;
+ int result;
+
+# if CHOWN_CHANGE_TIME_BUG
+ struct stat st;
+
+ if (gid != (gid_t) -1 || uid != (uid_t) -1)
+ {
+ if (lstat (file, &st))
+ return -1;
+ stat_valid = true;
+ if (!S_ISLNK (st.st_mode))
+ return chown (file, uid, gid);
+ }
+# endif
+
+# if CHOWN_TRAILING_SLASH_BUG
+ if (!stat_valid)
+ {
+ size_t len = strlen (file);
+ if (len && file[len - 1] == '/')
+ return chown (file, uid, gid);
+ }
+# endif
+
+ result = lchown (file, uid, gid);
+
+# if CHOWN_CHANGE_TIME_BUG && HAVE_LCHMOD
+ if (result == 0 && stat_valid
+ && (uid == st.st_uid || uid == (uid_t) -1)
+ && (gid == st.st_gid || gid == (gid_t) -1))
+ {
+ /* No change in ownership, but at least one argument was not -1,
+ so we are required to update ctime. Since lchown succeeded,
+ we assume that lchmod will do likewise. But if the system
+ lacks lchmod and lutimes, we are out of luck. Oh well. */
+ result = lchmod (file, st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO
+ | S_ISUID | S_ISGID | S_ISVTX));
+ }
+# endif
+
+ return result;
}
#endif /* HAVE_LCHOWN */