$ git clone -n https://src.fedoraproject.org/rpms/mtd-utils.git /var/lib/mock/f40-build-2012129-45772/root/chroot_tmpdir/scmroot/mtd-utils
Cloning into '/var/lib/mock/f40-build-2012129-45772/root/chroot_tmpdir/scmroot/mtd-utils'...
$ git fetch origin addc86ba3f37cd0f1e40f7775e97a22faef263f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtd-utils
 * [new ref]         addc86ba3f37cd0f1e40f7775e97a22faef263f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at addc86b Update to latest upstream release