LU-13982 tests: fix infinite loop in sanity test_184c

If the dd in test_184c fails to create the file, for example due to
ENOSPC, the subsequent "while" loops indefinitely.

So add a loop-count to ensure it stops eventually.

Also change the test from "-f" to "-s" so we wait for the file to be
non-empty.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I5051adf101f08856b97fa994f687b976fda84df4
Reviewed-on: https://review.whamcloud.com/40007
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>

diff --git a/lustre/tests/sanity.sh b/lustre/tests/sanity.sh
index adcf85b..4212768 100755 (executable)
--- a/lustre/tests/sanity.sh
+++ b/lustre/tests/sanity.sh
@@ -16022,8 +16022,9 @@ test_184c() {
        dd if=$ref1 of=$file1 bs=16k &
        local DD_PID=$!
 
-       # Make sure dd starts to copy file
-       while [ ! -f $file1 ]; do sleep 0.1; done
+       # Make sure dd starts to copy file, but wait at most 5 seconds
+       local loops=0
+       while [ ! -s $file1 -a $((loops++)) -lt 50 ]; do sleep 0.1; done
 
        $LFS swap_layouts $file1 $file2
        local rc=$?