test/atomicity: use a more portable 'cp' form

-a already implies -r/-R, so no need for both.

FreeBSD's cp complains:

  cp: the -R and -r options may not be specified together

diff --git a/test/atomicity b/test/atomicity
index 6df0a00e4084281c9b03027668ff2e0ca38bf15a..1c786fa2724262dad40cc9f7b883b6269586bc1d 100755 (executable)
--- a/test/atomicity
+++ b/test/atomicity
@@ -51,7 +51,7 @@ if test_require_external_prereq gdb; then
 
     # Prepare a snapshot of the updated maildir.  The gdb script will
     # update the database in this snapshot as it goes.
-    cp -ra $MAIL_DIR $MAIL_DIR.snap
+    cp -a $MAIL_DIR $MAIL_DIR.snap
     cp ${NOTMUCH_CONFIG} ${NOTMUCH_CONFIG}.snap
     NOTMUCH_CONFIG=${NOTMUCH_CONFIG}.snap notmuch config set database.path $MAIL_DIR.snap