$ git clone -n https://src.fedoraproject.org/rpms/gmailctl.git /var/lib/mock/f42-build-3354259-45019/root/chroot_tmpdir/scmroot/gmailctl
Cloning into '/var/lib/mock/f42-build-3354259-45019/root/chroot_tmpdir/scmroot/gmailctl'...
$ git fetch origin 600e8054c5eff6a9622df2af286b4fb87016664c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmailctl
 * [new ref]         600e8054c5eff6a9622df2af286b4fb87016664c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 600e805 update to v0.11.0, close rhbz#2338866