$ git clone -n https://src.fedoraproject.org/rpms/distribution-gpg-keys.git /var/lib/mock/f40-build-2209149-52150/root/chroot_tmpdir/scmroot/distribution-gpg-keys
Cloning into '/var/lib/mock/f40-build-2209149-52150/root/chroot_tmpdir/scmroot/distribution-gpg-keys'...
$ git fetch origin fc97ed4bc3a9eddb9d1fa5ed157495482ec9984c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/distribution-gpg-keys
 * [new ref]         fc97ed4bc3a9eddb9d1fa5ed157495482ec9984c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc97ed4 Update distribution-gpg-keys to 1.99-1