qemu-iotests: Test qemu-img operation on zero size image

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

tests/qemu-iotests/042

@@ -0,0 +1,78 @@
+#!/bin/bash
+#
+# Test qemu-img operation on zero size images
+#
+# Copyright (C) 2012 Red Hat, 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, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2 qcow qed vmdk
+_supported_proto file
+_supported_os Linux
+
+echo
+echo "== Creating zero size image =="
+
+_make_test_img 0
+_check_test_img
+
+mv $TEST_IMG $TEST_IMG.orig
+
+echo
+echo "== Converting the image =="
+
+$QEMU_IMG convert -O $IMGFMT $TEST_IMG.orig $TEST_IMG
+_check_test_img
+
+echo
+echo "== Converting the image, compressed =="
+
+if [ "$IMGFMT" == "qcow2" ]; then
+    $QEMU_IMG convert -c -O $IMGFMT $TEST_IMG.orig $TEST_IMG
+fi
+_check_test_img
+
+echo
+echo "== Rebasing the image =="
+
+$QEMU_IMG rebase -u -b $TEST_IMG.orig $TEST_IMG
+$QEMU_IMG rebase -b $TEST_IMG.orig $TEST_IMG
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
+

tests/qemu-iotests/042.out

@@ -0,0 +1,15 @@
+QA output created by 042
+
+== Creating zero size image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0 
+No errors were found on the image.
+
+== Converting the image ==
+No errors were found on the image.
+
+== Converting the image, compressed ==
+No errors were found on the image.
+
+== Rebasing the image ==
+No errors were found on the image.
+*** done

tests/qemu-iotests/group

@@ -47,3 +47,4 @@
 038 rw auto backing
 039 rw auto
 040 rw auto
+042 rw auto quick