$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcodecs.git /var/lib/mock/f42-build-side-1-3533243-46361/root/chroot_tmpdir/scmroot/kf6-kcodecs
Cloning into '/var/lib/mock/f42-build-side-1-3533243-46361/root/chroot_tmpdir/scmroot/kf6-kcodecs'...
$ git fetch origin 54e07b464e35cbaee5eab984c9dbfad9351bb1cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcodecs
 * [new ref]         54e07b464e35cbaee5eab984c9dbfad9351bb1cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54e07b4 6.14.0