$ git clone -n https://src.fedoraproject.org/rpms/alot.git /var/lib/mock/f42-build-side-1-3517583-46098/root/chroot_tmpdir/scmroot/alot
Cloning into '/var/lib/mock/f42-build-side-1-3517583-46098/root/chroot_tmpdir/scmroot/alot'...
$ git fetch origin 49c23307661e5cb91b810c7d1961d32468d6ca69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alot
 * [new ref]         49c23307661e5cb91b810c7d1961d32468d6ca69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49c2330 Depend on python-standard-mailcap