$ git clone -n https://src.fedoraproject.org/rpms/pax-utils.git /var/lib/mock/f45-build-21441-584/root/chroot_tmpdir/scmroot/pax-utils
Cloning into '/var/lib/mock/f45-build-21441-584/root/chroot_tmpdir/scmroot/pax-utils'...
$ git fetch origin b29c187088e6d5af2d773ab969306e74ac13de20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pax-utils
 * [new ref]         b29c187088e6d5af2d773ab969306e74ac13de20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b29c187 update to 1.3.11 (resolves rhbz#2510146)