$ git clone -n https://src.fedoraproject.org/rpms/duplicity.git /var/lib/mock/f40-build-763037-122303/root/chroot_tmpdir/scmroot/duplicity
Cloning into '/var/lib/mock/f40-build-763037-122303/root/chroot_tmpdir/scmroot/duplicity'...
$ git fetch origin 98b0ad5cb0a34bb555c05bd9f92c3e53ce38e230:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/duplicity
 * [new ref]         98b0ad5cb0a34bb555c05bd9f92c3e53ce38e230 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98b0ad5 Don't require setuptools_scm at runtime