$ git clone -n https://src.fedoraproject.org/rpms/binutils.git /var/lib/mock/f41-build-807940-145545/root/chroot_tmpdir/scmroot/binutils
Cloning into '/var/lib/mock/f41-build-807940-145545/root/chroot_tmpdir/scmroot/binutils'...
$ git fetch origin 42d71d98c899ed7b6e5535a82e9ff12bf9fe2863:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/binutils
 * [new ref]         42d71d98c899ed7b6e5535a82e9ff12bf9fe2863 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42d71d9 Rebase to commit 83b972fc272db31ab48aa5cde84f47c98868d7c8