[PULL 1/7] iotests: use TEST_IMG_FILE instead of TEST_IMG in _require_large_file

[Eric Blake <eblake@redhat.com>]

From: "Denis V. Lunev" <den@openvz.org>

We need to check that we are able to create large enough file which is
used as an export base rather than connection URL. Unfortunately, there
are cases when the TEST_IMG_FILE is not defined. We should fallback to
TEST_IMG in that case.

This problem has been detected when running
    ./check -nbd 5
The test should be able to run while it does not.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Hanna Reitz <hreitz@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20230906140917.559129-2-den@openvz.org>
Tested-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 tests/qemu-iotests/common.rc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index d145f08201c..95c12577dd4 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -979,10 +979,15 @@ _require_drivers()
 #
 _require_large_file()
 {
-    if ! truncate --size="$1" "$TEST_IMG"; then
+    if [ -z "$TEST_IMG_FILE" ]; then
+        FILENAME="$TEST_IMG"
+    else
+        FILENAME="$TEST_IMG_FILE"
+    fi
+    if ! truncate --size="$1" "$FILENAME"; then
         _notrun "file system on $TEST_DIR does not support large enough files"
     fi
-    rm "$TEST_IMG"
+    rm "$FILENAME"
 }

 # Check that a set of devices is available in the QEMU binary
-- 
2.41.0