$ git clone -n https://src.fedoraproject.org/rpms/libtsm.git /var/lib/mock/f45-build-17138-496/root/chroot_tmpdir/scmroot/libtsm
Cloning into '/var/lib/mock/f45-build-17138-496/root/chroot_tmpdir/scmroot/libtsm'...
$ git fetch origin 926b1459fa3032f3be527d24916d9ed6c54082db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtsm
 * [new ref]         926b1459fa3032f3be527d24916d9ed6c54082db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 926b145 Update to v4.7.1