$ git clone -n https://src.fedoraproject.org/rpms/plymouth-kcm.git /var/lib/mock/f40-build-832353-14883/root/chroot_tmpdir/scmroot/plymouth-kcm
Cloning into '/var/lib/mock/f40-build-832353-14883/root/chroot_tmpdir/scmroot/plymouth-kcm'...
$ git fetch origin 15aceb666b7ed2c1703a7a298c9ef050e9a10a70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plymouth-kcm
 * [new ref]         15aceb666b7ed2c1703a7a298c9ef050e9a10a70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15aceb6 fix: really modify spec files for 6.0.5