$ git clone -n https://src.fedoraproject.org/rpms/cdrdao.git /var/lib/mock/f39-build-2109893-50643/root/chroot_tmpdir/scmroot/cdrdao
Cloning into '/var/lib/mock/f39-build-2109893-50643/root/chroot_tmpdir/scmroot/cdrdao'...
$ git fetch origin 66fc579a5918c113029fdd25694a4c82a6795777:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cdrdao
 * [new ref]         66fc579a5918c113029fdd25694a4c82a6795777 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66fc579 Backport PR #21 to fix crashes in cdrdao and whipper