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>
(cherry picked from commit e94d3c11edb9c9cbcf108463fdff8404df79be33)

diff --git a/qa/workunits/rbd/import_export.sh b/qa/workunits/rbd/import_export.sh
index 8566d18e48e4d7738cbe5a85756544aaec18085b..284e1f343637bccc20fbcaf0ba9b212c32d17be9 100755 (executable)
--- a/qa/workunits/rbd/import_export.sh
+++ b/qa/workunits/rbd/import_export.sh
@@ -19,7 +19,9 @@ 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