$ git clone -n https://src.fedoraproject.org/rpms/dkms.git /var/lib/mock/f45-build-7567-367/root/chroot_tmpdir/scmroot/dkms
Cloning into '/var/lib/mock/f45-build-7567-367/root/chroot_tmpdir/scmroot/dkms'...
$ git fetch origin c90af623963e0acf607a5573d5f6af244b5dd103:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dkms
 * [new ref]         c90af623963e0acf607a5573d5f6af244b5dd103 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c90af62 Add 3.4.3 sources