$ git clone -n https://src.fedoraproject.org/rpms/python-matrix-common.git /var/lib/mock/f39-build-1606178-38611/root/chroot_tmpdir/scmroot/python-matrix-common
Cloning into '/var/lib/mock/f39-build-1606178-38611/root/chroot_tmpdir/scmroot/python-matrix-common'...
$ git fetch origin adc106ffba37b81b174a61f763e4d7428f4264ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-matrix-common
 * [new ref]         adc106ffba37b81b174a61f763e4d7428f4264ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adc106f SPDX migration