$ git clone -n https://src.fedoraproject.org/rpms/xmp.git /var/lib/mock/f45-build-38979-731/root/chroot_tmpdir/scmroot/xmp
Cloning into '/var/lib/mock/f45-build-38979-731/root/chroot_tmpdir/scmroot/xmp'...
$ git fetch origin 80663ad766cc149874509b5090dd9d357fdd889f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmp
 * [new ref]         80663ad766cc149874509b5090dd9d357fdd889f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80663ad update to 4.3.1 (resolves rhbz#2510116)