[PATCH v2 2/2] tests: Collapse echoed JSON input to a single line

[David Edmondson <david.edmondson@oracle.com>]

When sending JSON to running qemu, qemu-io, etc. instances, flatten
the echoed input to a single line to ensure that comparisons with the
expected input (which is always a single line) are successful.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
---
 tests/qemu-iotests/common.filter | 6 ++++++
 tests/qemu-iotests/common.qemu   | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
index 172ea5752e..d51df59769 100644
--- a/tests/qemu-iotests/common.filter
+++ b/tests/qemu-iotests/common.filter
@@ -332,5 +332,11 @@ for fname in fnames:
 sys.stdout.write(result)'
 }
 
+# Convert multi-line input to a single line.
+_filter_collapse_lines()
+{
+    (tr -d '\n'; echo)
+}
+
 # make sure this script returns success
 true
diff --git a/tests/qemu-iotests/common.qemu b/tests/qemu-iotests/common.qemu
index de680cf1c7..9604c78b8a 100644
--- a/tests/qemu-iotests/common.qemu
+++ b/tests/qemu-iotests/common.qemu
@@ -159,7 +159,7 @@ _send_qemu_cmd()
     # input back to output); decide based on leading '{'
     if [ -z "$silent" ] && [ -z "$mismatch_only" ] &&
             [ "$cmd" != "${cmd#\{}" ]; then
-        echo "${cmd}" | _filter_testdir | _filter_imgfmt
+        echo "${cmd}" | _filter_testdir | _filter_imgfmt | _filter_collapse_lines
     fi
     while [ ${count} -gt 0 ]
     do
-- 
2.29.2