$ git clone -n https://src.fedoraproject.org/rpms/komikku.git /var/lib/mock/f39-build-2260631-54409/root/chroot_tmpdir/scmroot/komikku
Cloning into '/var/lib/mock/f39-build-2260631-54409/root/chroot_tmpdir/scmroot/komikku'...
$ git fetch origin e1797028b25639a9483fe3b56b56b8ef1eb6dff1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/komikku
 * [new ref]         e1797028b25639a9483fe3b56b56b8ef1eb6dff1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e179702 build: Add colorthief dep