$ git clone -n https://src.fedoraproject.org/rpms/butane.git /var/lib/mock/f40-build-2431654-60640/root/chroot_tmpdir/scmroot/butane
Cloning into '/var/lib/mock/f40-build-2431654-60640/root/chroot_tmpdir/scmroot/butane'...
$ git fetch origin 25f49ebc420e98208aba2ffa9907e82fe8a61861:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/butane
 * [new ref]         25f49ebc420e98208aba2ffa9907e82fe8a61861 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25f49eb  butane.spec: new release v0.20.0