$ git clone -n https://src.fedoraproject.org/rpms/grout.git /var/lib/mock/f45-build-13059-446/root/chroot_tmpdir/scmroot/grout
Cloning into '/var/lib/mock/f45-build-13059-446/root/chroot_tmpdir/scmroot/grout'...
$ git fetch origin 9f557135b2f3e818236c0adcc406a2a6363adf33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grout
 * [new ref]         9f557135b2f3e818236c0adcc406a2a6363adf33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f55713 Rebuild for FRR 10.7.1