$ git clone -n https://src.fedoraproject.org/rpms/plymouth-kcm.git /var/lib/mock/f40-build-2078204-49593/root/chroot_tmpdir/scmroot/plymouth-kcm
Cloning into '/var/lib/mock/f40-build-2078204-49593/root/chroot_tmpdir/scmroot/plymouth-kcm'...
$ git fetch origin 6d5de9460171b0f225c7df171b5c4d493b479adc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plymouth-kcm
 * [new ref]         6d5de9460171b0f225c7df171b5c4d493b479adc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d5de94 fix: upload missing sources