$ git clone -n https://src.fedoraproject.org/rpms/avr-binutils.git /var/lib/mock/f40-build-755864-118344/root/chroot_tmpdir/scmroot/avr-binutils
Cloning into '/var/lib/mock/f40-build-755864-118344/root/chroot_tmpdir/scmroot/avr-binutils'...
$ git fetch origin b5a67e31e340220d9a6a18c7ffe32d104ea66b5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/avr-binutils
 * [new ref]         b5a67e31e340220d9a6a18c7ffe32d104ea66b5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5a67e3 updated to 2.41