1 files changed, 66 insertions, 0 deletions
diff --git a/tests/chown/preserve-root.sh b/tests/chown/preserve-root.sh
new file mode 100755
index 0000000..3b0892f
--- /dev/null
+++ b/tests/chown/preserve-root.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+# Verify that --preserve-root works.
+
+# Copyright (C) 2006-2018 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 <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ chown
+skip_if_root_
+
+mkdir d && ln -s / d/slink-to-root
+
+
+# Even if --preserve-root were to malfunction, allowing the chown or
+# chgrp to traverse through "/", since we're running as non-root,
+# they would be very unlikely to cause any changes.
+chown -R --preserve-root 0 / >  out 2>&1 && fail=1
+chgrp -R --preserve-root 0 / >> out 2>&1 && fail=1
+
+# Here, if --preserve-root were to malfunction, chmod could make changes,
+# but only to files owned and unreadable by the user running this test,
+# and then, only to make them readable by owner.
+chmod -R --preserve-root u+r / >> out 2>&1 && fail=1
+
+# With -RHh, --preserve-root should trigger nothing,
+# since the symlink in question is not a command line argument.
+# Contrary to the above commands, these two should succeed.
+echo '==== test -RHh' >> out || framework_failure_
+chown -RHh --preserve-root $(id -u) d >> out 2>&1 || fail=1
+chgrp -RHh --preserve-root $(id -g) d >> out 2>&1 || fail=1
+
+# These must fail.
+echo '==== test -RLh' >> out || framework_failure_
+chown -RLh --preserve-root $(id -u) d >> out 2>&1 && fail=1
+chgrp -RLh --preserve-root $(id -g) d >> out 2>&1 && fail=1
+
+cat <<\EOF > exp || framework_failure_
+chown: it is dangerous to operate recursively on '/'
+chown: use --no-preserve-root to override this failsafe
+chgrp: it is dangerous to operate recursively on '/'
+chgrp: use --no-preserve-root to override this failsafe
+chmod: it is dangerous to operate recursively on '/'
+chmod: use --no-preserve-root to override this failsafe
+==== test -RHh
+==== test -RLh
+chown: it is dangerous to operate recursively on 'd/slink-to-root' (same as '/')
+chown: use --no-preserve-root to override this failsafe
+chgrp: it is dangerous to operate recursively on 'd/slink-to-root' (same as '/')
+chgrp: use --no-preserve-root to override this failsafe
+EOF
+
+compare exp out || fail=1
+
+Exit $fail