tests: pull qemu-nbd iotest helpers into common.nbd file

The helpers for starting/stopping qemu-nbd in 058 will be useful in
other test cases, so move them into a common.nbd file.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20181116155325.22428-4-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: fix shell quoting]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 8 insertions, 39 deletions

diff --git a/tests/qemu-iotests/058 b/tests/qemu-iotests/058
index 0d741a7cac..d6d4f94d5d 100755
--- a/tests/qemu-iotests/058
+++ b/tests/qemu-iotests/058
@@ -28,55 +28,19 @@ echo "QA output created by $seq"
 
 status=1	# failure is the default!
 
-nbd_unix_socket=$TEST_DIR/test_qemu_nbd_socket
-nbd_snapshot_img="nbd:unix:$nbd_unix_socket"
-rm -f "${TEST_DIR}/qemu-nbd.pid"
-
-_cleanup_nbd()
-{
-    local NBD_SNAPSHOT_PID
-    if [ -f "${TEST_DIR}/qemu-nbd.pid" ]; then
-        read NBD_SNAPSHOT_PID < "${TEST_DIR}/qemu-nbd.pid"
-        rm -f "${TEST_DIR}/qemu-nbd.pid"
-        if [ -n "$NBD_SNAPSHOT_PID" ]; then
-            kill "$NBD_SNAPSHOT_PID"
-        fi
-    fi
-    rm -f "$nbd_unix_socket"
-}
-
-_wait_for_nbd()
-{
-    for ((i = 0; i < 300; i++))
-    do
-        if [ -r "$nbd_unix_socket" ]; then
-            return
-        fi
-        sleep 0.1
-    done
-    echo "Failed in check of unix socket created by qemu-nbd"
-    exit 1
-}
-
-converted_image=$TEST_IMG.converted
-
 _export_nbd_snapshot()
 {
-    _cleanup_nbd
-    $QEMU_NBD -v -t -k "$nbd_unix_socket" "$TEST_IMG" -l $1 &
-    _wait_for_nbd
+    nbd_server_start_unix_socket "$TEST_IMG" -l $1
 }
 
 _export_nbd_snapshot1()
 {
-    _cleanup_nbd
-    $QEMU_NBD -v -t -k "$nbd_unix_socket" "$TEST_IMG" -l snapshot.name=$1 &
-    _wait_for_nbd
+    nbd_server_start_unix_socket "$TEST_IMG" -l snapshot.name=$1
 }
 
 _cleanup()
 {
-    _cleanup_nbd
+    nbd_server_stop
     _cleanup_test_img
     rm -f "$converted_image"
 }
@@ -86,6 +50,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 . ./common.rc
 . ./common.filter
 . ./common.pattern
+. ./common.nbd
 
 _supported_fmt qcow2
 _supported_proto file
@@ -94,6 +59,10 @@ _require_command QEMU_NBD
 # Internal snapshots are (currently) impossible with refcount_bits=1
 _unsupported_imgopts 'refcount_bits=1[^0-9]'
 
+nbd_snapshot_img="nbd:unix:$nbd_unix_socket"
+
+converted_image=$TEST_IMG.converted
+
 # Use -f raw instead of -f $IMGFMT for the NBD connection
 QEMU_IO_NBD="$QEMU_IO -f raw --cache=$CACHEMODE"