$ git clone -n https://src.fedoraproject.org/rpms/libreport.git /var/lib/mock/f40-build-800637-143605/root/chroot_tmpdir/scmroot/libreport
Cloning into '/var/lib/mock/f40-build-800637-143605/root/chroot_tmpdir/scmroot/libreport'...
$ git fetch origin dd967383cd514d792dd4584f835a39537e2a0f3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libreport
 * [new ref]         dd967383cd514d792dd4584f835a39537e2a0f3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd96738 [packit] 2.17.15 upstream release