Imported Upstream version 1.5

[debian/gzip] / lib / unlink.c

diff --git a/lib/unlink.c b/lib/unlink.c
deleted file mode 100644 (file)
index 3e42e28..0000000
--- a/lib/unlink.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/* Work around unlink bugs.
-
-   Copyright (C) 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
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include <config.h>
-
-#include <unistd.h>
-
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-
-#undef unlink
-
-/* Remove file NAME.
-   Return 0 if successful, -1 if not.  */
-
-int
-rpl_unlink (char const *name)
-{
-  /* Work around Solaris 9 bug where unlink("file/") succeeds.  */
-  size_t len = strlen (name);
-  int result = 0;
-  if (len && ISSLASH (name[len - 1]))
-    {
-      /* We can't unlink(2) something if it doesn't exist.  If it does
-         exist, then it resolved to a directory, due to the trailing
-         slash, and POSIX requires that the unlink attempt to remove
-         that directory (which would leave the symlink dangling).
-         Unfortunately, Solaris 9 is one of the platforms where the
-         root user can unlink directories, and we don't want to
-         cripple this behavior on real directories, even if it is
-         seldom needed (at any rate, it's nicer to let coreutils'
-         unlink(1) give the correct errno for non-root users).  But we
-         don't know whether name was an actual directory, or a symlink
-         to a directory; and due to the bug of ignoring trailing
-         slash, Solaris 9 would end up successfully unlinking the
-         symlink instead of the directory.  Technically, we could use
-         realpath to find the canonical directory name to attempt
-         deletion on.  But that is a lot of work for a corner case; so
-         we instead just use an lstat on the shortened name, and
-         reject symlinks with trailing slashes.  The root user of
-         unlink(1) will just have to live with the rule that they
-         can't delete a directory via a symlink.  */
-      struct stat st;
-      result = lstat (name, &st);
-      if (result == 0)
-        {
-          /* Trailing NUL will overwrite the trailing slash.  */
-          char *short_name = malloc (len);
-          if (!short_name)
-            {
-              errno = EPERM;
-              return -1;
-            }
-          memcpy (short_name, name, len);
-          while (len && ISSLASH (short_name[len - 1]))
-            short_name[--len] = '\0';
-          if (len && (lstat (short_name, &st) || S_ISLNK (st.st_mode)))
-            {
-              free (short_name);
-              errno = EPERM;
-              return -1;
-            }
-          free (short_name);
-        }
-    }
-  if (!result)
-    result = unlink (name);
-  return result;
-}