$ git clone -n https://src.fedoraproject.org/rpms/fedora-workstation-repositories.git /var/lib/mock/f45-build-8893-396/root/chroot_tmpdir/scmroot/fedora-workstation-repositories
Cloning into '/var/lib/mock/f45-build-8893-396/root/chroot_tmpdir/scmroot/fedora-workstation-repositories'...
$ git fetch origin a752eb32f58662a45ade2f6b0855aa38385fdcfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-workstation-repositories
 * [new ref]         a752eb32f58662a45ade2f6b0855aa38385fdcfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a752eb3 Delete PyCharm repo