$ git clone -n https://src.fedoraproject.org/rpms/python-fastpurge.git /var/lib/mock/f41-build-side-2-python-2710025-30481/root/chroot_tmpdir/scmroot/python-fastpurge
Cloning into '/var/lib/mock/f41-build-side-2-python-2710025-30481/root/chroot_tmpdir/scmroot/python-fastpurge'...
$ git fetch origin dda45b2b3cca2798a1aa8eaab8e4cda78de36673:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-fastpurge
 * [new ref]         dda45b2b3cca2798a1aa8eaab8e4cda78de36673 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dda45b2 convert GPLv3+ license to SPDX