$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Merge.git /var/lib/mock/f41-build-1046752-19100/root/chroot_tmpdir/scmroot/perl-XML-Merge
Cloning into '/var/lib/mock/f41-build-1046752-19100/root/chroot_tmpdir/scmroot/perl-XML-Merge'...
$ git fetch origin e7daa711852fe02533bedbaa8e4d5bcf03176a87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Merge
 * [new ref]         e7daa711852fe02533bedbaa8e4d5bcf03176a87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7daa71 Eliminate use of obsolete %patchN syntax (#2283636)