$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Grove.git /var/lib/mock/f41-build-898972-16975/root/chroot_tmpdir/scmroot/perl-XML-Grove
Cloning into '/var/lib/mock/f41-build-898972-16975/root/chroot_tmpdir/scmroot/perl-XML-Grove'...
$ git fetch origin 85dd84f2af7f9553c5a1d05fdd89da98374727a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Grove
 * [new ref]         85dd84f2af7f9553c5a1d05fdd89da98374727a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85dd84f Eliminate use of obsolete %patchN syntax (#2283636)