$ git clone -n https://src.fedoraproject.org/rpms/foomuuri.git /var/lib/mock/f42-build-3279846-41338/root/chroot_tmpdir/scmroot/foomuuri
Cloning into '/var/lib/mock/f42-build-3279846-41338/root/chroot_tmpdir/scmroot/foomuuri'...
$ git fetch origin 0bf0d1db4632eac4613b7f003ed297f01b1ba118:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foomuuri
 * [new ref]         0bf0d1db4632eac4613b7f003ed297f01b1ba118 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0bf0d1d 0.27