qa: allow small allocation diffs for exported rbds

The local filesytem may behave slightly differently. This isn't
foolproof, but seems to be reliable enough on rhel7 rootfs, where
exact comparison was failing.

Fixes: #10002
Signed-off-by: Josh Durgin <jdurgin@redhat.com>

diff --git a/qa/workunits/rbd/import_export.sh b/qa/workunits/rbd/import_export.sh
index b8fa0f781fc3980357af5578ba466ac77d83f58c..d1ba29a4f1ece4e8bcaf367072e1b313020f7a8a 100755 (executable)
--- a/qa/workunits/rbd/import_export.sh
+++ b/qa/workunits/rbd/import_export.sh
@@ -20,7 +20,9 @@ compare_files_and_ondisk_sizes () {
     cmp -l $1 $2 || return 1
     origsize=$(stat $1 --format %b)
     exportsize=$(stat $2 --format %b)
-    [ $origsize = $exportsize ]
+    difference=$(($exportsize - $origsize))
+    difference=${difference#-} # absolute value
+    test $difference -ge 0 -a $difference -lt 4096
 }
 
 # cannot import a dir