$ git clone -n https://src.fedoraproject.org/rpms/plymouth-kcm.git /var/lib/mock/f38-build-side-42-init-devel-637887-26384/root/chroot_tmpdir/scmroot/plymouth-kcm
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-637887-26384/root/chroot_tmpdir/scmroot/plymouth-kcm'...
$ git fetch origin b2c864ffa22fa3e18aeee4b8a3de4f31b0884526:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plymouth-kcm
 * [new ref]         b2c864ffa22fa3e18aeee4b8a3de4f31b0884526 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2c864f 5.27.4