$ git clone -n https://src.fedoraproject.org/rpms/rust-portpicker.git /var/lib/mock/f38-build-side-43-rust-devel-1418337-31459/root/chroot_tmpdir/scmroot/rust-portpicker
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418337-31459/root/chroot_tmpdir/scmroot/rust-portpicker'...
$ git fetch origin 891450377c3872ea8a32af1240b2c9736a189f18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-portpicker
 * [new ref]         891450377c3872ea8a32af1240b2c9736a189f18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8914503 Initial Fedora package