$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcodecs.git /var/lib/mock/f40-build-787189-134736/root/chroot_tmpdir/scmroot/kf6-kcodecs
Cloning into '/var/lib/mock/f40-build-787189-134736/root/chroot_tmpdir/scmroot/kf6-kcodecs'...
$ git fetch origin dcbed541e249ae9e3eadd7e9a6d2e47618ec6526:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcodecs
 * [new ref]         dcbed541e249ae9e3eadd7e9a6d2e47618ec6526 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcbed54 6.0.0