[Qemu-devel] [PATCH v2 1/4] qemu-iotests: refine common.config

[Bo Tu <tubo@linux.vnet.ibm.com>]

Replacing sed with awk, then it's easier to read.
Replacing "[ ! -z "$default_alias_machine" ]" with
"[[ $default_alias_machine ]]", then it's slightly shorter.

Suggested-By: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Eric Blake   <eblake@redhat.com>
Signed-off-by: Bo Tu <tubo@linux.vnet.ibm.com>
---
 tests/qemu-iotests/common.config | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tests/qemu-iotests/common.config b/tests/qemu-iotests/common.config
index 596bb2b..08f4b4e 100644
--- a/tests/qemu-iotests/common.config
+++ b/tests/qemu-iotests/common.config
@@ -128,11 +128,10 @@ export QEMU_IMG=_qemu_img_wrapper
 export QEMU_IO=_qemu_io_wrapper
 export QEMU_NBD=_qemu_nbd_wrapper
 
-default_machine=$($QEMU -machine \? | awk '/(default)/{print $1}')
-default_alias_machine=$($QEMU -machine \? |\
-    awk -v var_default_machine="$default_machine"\)\
-    '{if ($(NF-2)=="(alias"&&$(NF-1)=="of"&&$(NF)==var_default_machine){print $1}}')
-if [ ! -z "$default_alias_machine" ]; then
+default_machine=$($QEMU -machine help | sed -n '/(default)/ s/ .*//p')
+default_alias_machine=$($QEMU -machine help | \
+   sed -n "/(alias of $default_machine)"/' { s/ .*//p; q; }')
+if [[ "$default_alias_machine" ]]; then
     default_machine="$default_alias_machine"
 fi
 
-- 
2.3.0