$ git clone -n https://src.fedoraproject.org/rpms/xsane.git /var/lib/mock/f41-build-852887-166514/root/chroot_tmpdir/scmroot/xsane
Cloning into '/var/lib/mock/f41-build-852887-166514/root/chroot_tmpdir/scmroot/xsane'...
$ git fetch origin e29e5dc0b578e14d3834293338d90dd5aaf0ae75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsane
 * [new ref]         e29e5dc0b578e14d3834293338d90dd5aaf0ae75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e29e5dc Use https bugzilla URL