$ git clone -n https://src.fedoraproject.org/rpms/python-cryptography.git /var/lib/mock/f40-build-2700810-70311/root/chroot_tmpdir/scmroot/python-cryptography
Cloning into '/var/lib/mock/f40-build-2700810-70311/root/chroot_tmpdir/scmroot/python-cryptography'...
$ git fetch origin 189a558764b274ddf9626ca750758462ea0e2664:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cryptography
 * [new ref]         189a558764b274ddf9626ca750758462ea0e2664 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 189a558 Update to 42.0.5