iotests: Do not suppress segfaults in bash tests

Currently, if a qemu/qemu-io/qemu-img/qemu-nbd invocation receives a
segmentation fault, that message is invisible in most cases since the
output is generally filtered and bash suppresses the segmentation fault
notice for any but the last element of a pipe.

Most of the time, the test will then fail anyway because of missing
output, but not necessarily (as happened with test 82 recently).

Fix this by making the corresponding environment variables point to
wrapper functions which execute the respective command in a subshell.

Giving options to qemu/qemu-io/qemu-img and path names with spaces were
broken for the Python tests; this patch "accidentally" fixes that.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 1f913a1b2c..8e3419ff9e 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -31,11 +31,19 @@ import struct
 __all__ = ['imgfmt', 'imgproto', 'test_dir' 'qemu_img', 'qemu_io',
            'VM', 'QMPTestCase', 'notrun', 'main']
 
-# This will not work if arguments or path contain spaces but is necessary if we
+# This will not work if arguments contain spaces but is necessary if we
 # want to support the override options that ./check supports.
-qemu_img_args = os.environ.get('QEMU_IMG', 'qemu-img').strip().split(' ')
-qemu_io_args = os.environ.get('QEMU_IO', 'qemu-io').strip().split(' ')
-qemu_args = os.environ.get('QEMU', 'qemu').strip().split(' ')
+qemu_img_args = [os.environ.get('QEMU_IMG_PROG', 'qemu-img')]
+if os.environ.get('QEMU_IMG_OPTIONS'):
+    qemu_img_args += os.environ['QEMU_IMG_OPTIONS'].strip().split(' ')
+
+qemu_io_args = [os.environ.get('QEMU_IO_PROG', 'qemu-io')]
+if os.environ.get('QEMU_IO_OPTIONS'):
+    qemu_io_args += os.environ['QEMU_IO_OPTIONS'].strip().split(' ')
+
+qemu_args = [os.environ.get('QEMU_PROG', 'qemu')]
+if os.environ.get('QEMU_OPTIONS'):
+    qemu_args += os.environ['QEMU_OPTIONS'].strip().split(' ')
 
 imgfmt = os.environ.get('IMGFMT', 'raw')
 imgproto = os.environ.get('IMGPROTO', 'file')