$ git clone -n https://src.fedoraproject.org/rpms/distribution-gpg-keys.git /var/lib/mock/f45-build-8698-394/root/chroot_tmpdir/scmroot/distribution-gpg-keys
Cloning into '/var/lib/mock/f45-build-8698-394/root/chroot_tmpdir/scmroot/distribution-gpg-keys'...
$ git fetch origin 9b12896c9957dde0ff54cbc3c1e82fd8c2989c8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/distribution-gpg-keys
 * [new ref]         9b12896c9957dde0ff54cbc3c1e82fd8c2989c8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b12896 Update distribution-gpg-keys to 1.121-1