1 files changed, 49 insertions, 0 deletions
diff --git a/tests/t0202-gpt-pmbr.sh b/tests/t0202-gpt-pmbr.sh
new file mode 100755
index 0000000..1b475bf
--- /dev/null
+++ b/tests/t0202-gpt-pmbr.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+# Preserve first 446B of the Protected MBR for gpt partitions.
+
+# Copyright (C) 2009-2014, 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../parted
+
+dev=loop-file
+bootcode_size=446
+
+dd if=/dev/null of=$dev bs=1 seek=1M || framework_failure
+
+# create a GPT partition table
+parted -s $dev mklabel gpt > out 2>&1 || fail=1
+# expect no output
+compare /dev/null out || fail=1
+
+# Fill the first $bootcode_size bytes with 0's.
+# This affects only the protective MBR, so doesn't affect validity of gpt table.
+printf %0${bootcode_size}d 0 > in || fail=1
+dd of=$dev bs=1 seek=0 count=$bootcode_size conv=notrunc < in || fail=1
+
+parted -s $dev p || fail=1
+
+# create a GPT partition table on top of the existing one.
+parted -s $dev mklabel gpt > out 2>&1 || fail=1
+# expect no output
+compare /dev/null out || fail=1
+
+# Extract the first $bootcode_size Bytes after GPT creation
+dd if=$dev of=after bs=1c count=$bootcode_size > /dev/null 2>&1 || fail=1
+
+# Compare the before and after
+compare in after || fail=1
+
+Exit $fail