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From 11b37b65d08c2a8b6d967fd866ebbdbe7e864949 Mon Sep 17 00:00:00 2001
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From: Nishant Nayan <nishant.nayan@oracle.com>
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Date: Thu, 26 Nov 2020 14:35:17 +0000
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Subject: [PATCH] rm: do not skip files upon failure to remove an empty dir
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When removing a directory fails for some reason, and that directory
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is empty, the rm_fts code gets the return value of the excise call
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confused with the return value of its earlier call to prompt,
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causing fts_skip_tree to be called again and the next file
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that rm would otherwise have deleted to survive.
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* src/remove.c (rm_fts): Ensure we only skip a single fts entry,
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when processing empty dirs. I.e. only skip the entry
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having successfully removed it.
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* tests/rm/empty-immutable-skip.sh: New root-only test.
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* tests/local.mk: Add it.
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* NEWS: Mention the bug fix.
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Fixes https://bugs.gnu.org/44883
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Upstream-commit: 6bf108358a6104ec1c694c9530b3cd56b95f4b57
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/remove.c | 3 ++-
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tests/local.mk | 1 +
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tests/rm/empty-immutable-skip.sh | 46 ++++++++++++++++++++++++++++++++
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3 files changed, 49 insertions(+), 1 deletion(-)
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create mode 100755 tests/rm/empty-immutable-skip.sh
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diff --git a/src/remove.c b/src/remove.c
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index 2d40c55..adf9489 100644
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--- a/src/remove.c
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+++ b/src/remove.c
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@@ -506,7 +506,8 @@ rm_fts (FTS *fts, FTSENT *ent, struct rm_options const *x)
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/* When we know (from prompt when in interactive mode)
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that this is an empty directory, don't prompt twice. */
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s = excise (fts, ent, x, true);
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- fts_skip_tree (fts, ent);
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+ if (s == RM_OK)
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+ fts_skip_tree (fts, ent);
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}
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if (s != RM_OK)
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diff --git a/tests/local.mk b/tests/local.mk
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index 5f7f775..2aeff2b 100644
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--- a/tests/local.mk
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+++ b/tests/local.mk
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@@ -136,6 +136,7 @@ all_root_tests = \
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tests/rm/no-give-up.sh \
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tests/rm/one-file-system.sh \
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tests/rm/read-only.sh \
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+ tests/rm/empty-immutable-skip.sh \
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tests/tail-2/append-only.sh \
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tests/tail-2/end-of-device.sh \
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tests/touch/now-owned-by-other.sh
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diff --git a/tests/rm/empty-immutable-skip.sh b/tests/rm/empty-immutable-skip.sh
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new file mode 100755
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index 0000000..c91d8d4
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--- /dev/null
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+++ b/tests/rm/empty-immutable-skip.sh
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@@ -0,0 +1,46 @@
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+#!/bin/sh
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+# Ensure that rm does not skip extra files after hitting an empty immutable dir.
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+# Requires root access to do chattr +i, as well as an ext[23] or xfs file system
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+
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+# Copyright (C) 2020 Free Software Foundation, Inc.
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+
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+# This program is free software: you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation, either version 3 of the License, or
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+# (at your option) any later version.
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+
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <https://www.gnu.org/licenses/>.
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+
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+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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+print_ver_ rm
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+require_root_
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+
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+# These simple one-file operations are expected to work even in the
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+# presence of this bug, and we need them to set up the rest of the test.
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+chattr_i_works=1
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+touch f
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+chattr +i f 2>/dev/null || chattr_i_works=0
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+rm f 2>/dev/null
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+test -f f || chattr_i_works=0
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+chattr -i f 2>/dev/null || chattr_i_works=0
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+rm f 2>/dev/null || chattr_i_works=0
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+test -f f && chattr_i_works=0
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+
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+if test $chattr_i_works = 0; then
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+ skip_ "chattr +i doesn't work on this file system"
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+fi
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+
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+mkdir empty || framework_failure_
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+touch x y || framework_failure_
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+chattr +i empty || framework_failure_
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+rm -rf empty x y
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+{ test -f x || test -f y; } && fail=1
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+chattr -i empty
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+
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+Exit $fail
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--
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2.26.2
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