new feature: rm accepts new option: --one-file-system

Suggested by Steve McIntyre in <http://bugs.debian.org/392925>.
* src/remove.h (struct rm_options) [one_file_system]: New member.
* src/rm.c (rm_option_init): Initialize it.
(usage): Document the option.
* src/mv.c (rm_option_init): Likewise.
* src/remove.c (remove_dir): With --one-file-system and --recursive,
for each directory command line argument, do not affect a file system
different from that of the starting directory.  And give a diagnostic.
* src/rm.c (ONE_FILE_SYSTEM): New enum.
(main): Handle new option.
* tests/rm/one-file-system: Test the above.
* tests/rm/Makefile.am (TESTS): Add one-file-system.
* tests/Makefile.am (check-root): Add the rm/one-file-system
test to the list.
(EXTRA_DIST): Add other-fs-tmpdir.

* tests/mv/setup: Removed.  Renamed to...
* tests/other-fs-tmpdir: ...this new file.
* tests/mv/Makefile.am (EXTRA_DIST): Remove setup.
* tests/mv/acl: Reflect renaming: use ../other-fs-tmpdir.
* tests/mv/backup-is-src: Likewise.
* tests/mv/hard-link-1: Likewise.
* tests/mv/leak-fd: Likewise.
* tests/mv/mv-special-1: Likewise.
* tests/mv/part-fail: Likewise.
* tests/mv/part-hardlink: Likewise.
* tests/mv/part-rename: Likewise.
* tests/mv/part-symlink: Likewise.
* tests/mv/partition-perm: Likewise.
* tests/mv/to-symlink: Likewise.
* tests/mv/into-self-2: Likewise.

[doc/ChangeLog]
* coreutils.texi (rm invocation): Describe --one-file-system.

1 files changed, 61 insertions, 0 deletions

diff --git a/tests/other-fs-tmpdir b/tests/other-fs-tmpdir
new file mode 100755
index 000000000..0886437aa
--- /dev/null
+++ b/tests/other-fs-tmpdir
@@ -0,0 +1,61 @@
+#! /bin/sh
+
+# Use stat to find a writable directory on a file system different from that
+# of the current directory.  If one is found, create a temporary directory
+# inside it.
+
+# Copyright (C) 1998, 1999, 2001, 2002, 2005 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+test "${CANDIDATE_TMP_DIRS+set}" = set \
+  || CANDIDATE_TMP_DIRS="$TMPDIR /tmp /var/tmp /usr/tmp $HOME"
+
+other_partition_tmpdir=
+
+dot_mount_point=`stat -c %d .`
+for d in $CANDIDATE_TMP_DIRS; do
+
+  # Skip nonexistent directories.
+  test -d $d || continue
+
+  d_mount_point=`stat -L -c %d $d`
+
+  # Same partition?  Skip it.
+  test x$d_mount_point = x$dot_mount_point && continue
+
+  # See if we can create a directory in it.
+  if mkdir "$d/tmp$$" > /dev/null 2>&1; then
+    other_partition_tmpdir="$d/tmp$$"
+    break
+  fi
+
+done
+
+if test -z "$other_partition_tmpdir"; then
+  cat <<EOF 1>&2
+**************************************
+This test requires a writable directory on a different
+disk partition, and I couldn't find one.  I tried these:
+  $CANDIDATE_TMP_DIRS
+Set your environment variable CANDIDATE_TMP_DIRS to make
+this test use a different list.
+**************************************
+EOF
+    #'
+fi
+
+test "$VERBOSE" = yes && set -x