$ git clone -n https://src.fedoraproject.org/rpms/logwatch.git /var/lib/mock/f45-build-17578-501/root/chroot_tmpdir/scmroot/logwatch
Cloning into '/var/lib/mock/f45-build-17578-501/root/chroot_tmpdir/scmroot/logwatch'...
$ git fetch origin e553f45bdf894e5ec56b720355c01053e1e479b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/logwatch
 * [new ref]         e553f45bdf894e5ec56b720355c01053e1e479b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e553f45 Upgrade to new upstream version