Rewrite init script in rust and fix non-shell CMDs

example/test.sh

@@ -295,8 +295,63 @@ EOF
     rm -rf "$work"
 }
 
+test_systemd() {
+    echo "=== Testing systemd as init ==="
+
+    work="$(mktemp -d)"
+    img="slim-test-systemd"
+
+    cat > "$work/slim-test.service" <<'SVC'
+[Unit]
+Description=slim systemd test
+After=multi-user.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c "echo SYSTEMD_TEST_OK > /dev/console; sleep 1; systemctl poweroff"
+
+[Install]
+WantedBy=multi-user.target
+SVC
+
+    cat > "$work/Containerfile" <<EOF
+FROM archlinux:latest
+COPY slim-test.service /etc/systemd/system/slim-test.service
+RUN mkdir -p /etc/systemd/system/multi-user.target.wants && \
+    ln -sf /etc/systemd/system/slim-test.service \
+       /etc/systemd/system/multi-user.target.wants/slim-test.service
+CMD ["/sbin/init"]
+EOF
+
+    echo "-- Building container image with systemd..."
+    if ! podman build -t "$img" "$work" >/dev/null 2>&1; then
+        report fail "systemd as init (podman build failed)"
+        rm -rf "$work"
+        return
+    fi
+
+    echo "-- Building slim VM..."
+    if ! "$SLIM_BIN" build qcow2 "$img" >/dev/null 2>&1; then
+        report fail "systemd as init (slim build failed)"
+        cleanup "$img" "$img"
+        rm -rf "$work"
+        return
+    fi
+
+    echo "-- Booting VM (systemd as PID 1)..."
+    output=$(timeout "$TIMEOUT" "$SLIM_BIN" run "$img" 2>&1 || true)
+    check_output "$output" "SYSTEMD_TEST_OK" "systemd boots and runs service"
+    check_output "$output" "reboot: Power down" "systemd shuts down cleanly"
+
+    cleanup "$img" "$img"
+    rm -rf "$work"
+}
+
 echo "Building slim..."
 cargo build 2>&1
+cargo build --release -p slim-init --target x86_64-unknown-linux-musl 2>&1
+cp target/x86_64-unknown-linux-musl/release/slim-init \
+   "${XDG_DATA_HOME:-$HOME/.local/share}/slim-rs/slim-init"
 
 test_distro "alpine" "alpine:latest" ""
 test_distro "archlinux" "archlinux:latest" "RUN pacman -Sy --noconfirm iproute2 wget; pacman -Sc --noconfirm"
@@ -307,6 +362,8 @@ test_mount
 
 test_service
 
+test_systemd
+
 echo ""
 echo "=== Results: $pass passed, $fail failed ==="
 [ "$fail" -eq 0 ]