1 files changed, 51 insertions, 0 deletions
diff --git a/tests/t0205-gpt-list-clobbers-pmbr.sh b/tests/t0205-gpt-list-clobbers-pmbr.sh
new file mode 100644
index 0000000..7bb79f9
--- /dev/null
+++ b/tests/t0205-gpt-list-clobbers-pmbr.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Ensure that printing a GPT partition table does not modify the pMBR.
+# Due to a bug in parted-2.1, "parted /dev/... print" would do just that.
+# Not a problem for most, but if you have a hybrid, e.g., gptsync'd
+# GPT/MBR table, merely listing the table with Parted-2.1 would clobber
+# the MBR part.
+
+# Copyright (C) 2010-2014, 2019-2023 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../parted
+
+ss=$sector_size_
+n_sectors=400
+dev=dev-file
+
+dd if=/dev/null of=$dev bs=$ss seek=$n_sectors || fail=1
+parted -s $dev mklabel gpt                     || fail=1
+parted -s $dev mkpart p1 101s 150s             || fail=1
+parted -s $dev mkpart p2 151s 200s             || fail=1
+parted -s $dev mkpart p3 201s 250s             || fail=1
+
+parted -m -s $dev u s p                        || fail=1
+
+# Write non-NUL bytes all over the MBR, so we're likely to see any change.
+# However, be careful to leave the type of the first partition, 0xEE,
+# as well as the final two magic bytes.
+printf '%0450d\xee%059d\x55\xaa' 0 0 | dd of=$dev count=1 conv=notrunc || fail=1
+
+dd if=$dev of=before count=1 || fail=1
+
+chmod a-w $dev
+parted -m -s $dev u s p || fail=1
+
+dd if=$dev of=after count=1 || fail=1
+
+cmp before after || fail=1
+
+Exit $fail