$ git clone -n https://src.fedoraproject.org/rpms/passim.git /var/lib/mock/f45-build-21421-584/root/chroot_tmpdir/scmroot/passim
Cloning into '/var/lib/mock/f45-build-21421-584/root/chroot_tmpdir/scmroot/passim'...
$ git fetch origin e2c0888655909f731596e9460f9970cb21be004e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/passim
 * [new ref]         e2c0888655909f731596e9460f9970cb21be004e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2c0888 New upstream release