$ git clone -n https://src.fedoraproject.org/rpms/python3-cryptography-vectors.git /var/lib/mock/f38-build-side-42-init-devel-767806-27746/root/chroot_tmpdir/scmroot/python3-cryptography-vectors
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-767806-27746/root/chroot_tmpdir/scmroot/python3-cryptography-vectors'...
$ git fetch origin 2422f33bfd3266021107fe0447933df39b2e11a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python3-cryptography-vectors
 * [new ref]         2422f33bfd3266021107fe0447933df39b2e11a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2422f33 Added the README