initramfs to also use merge-rootfs

initramfs/rootfs-extra/bin/flash-emmc.sh.tmpl

@@ -0,0 +1,67 @@
+#!/bin/sh
+set -eu
+
+MNT=/mnt
+USB_DEV=/dev/sda
+EMMC_DEV=/dev/mmcblk0
+DEFAULT_GLOB="${MNT}/$${BUILD_TAG}_RELEASE_IMAGE"
+
+mkdir -p "$MNT"
+
+echo "[*] Mounting USB..."
+mount "$USB_DEV" "$MNT"
+
+# Find a default image (first match)
+DEFAULT_IMG="$(ls $DEFAULT_GLOB 2>/dev/null | head -n1 || true)"
+
+echo
+if [ -n "$DEFAULT_IMG" ]; then
+    echo "Default image found:"
+    echo "  $DEFAULT_IMG"
+else
+    echo "No default image found under $DEFAULT_GLOB"
+fi
+echo
+
+# Prompt user
+printf "Image Location (%s): " "${DEFAULT_IMG:-/mnt/...}"
+read -r IMG
+
+# Use default if empty
+if [ -z "$IMG" ]; then
+    IMG="$DEFAULT_IMG"
+fi
+
+# Validate
+if [ -z "$IMG" ] || [ ! -f "$IMG" ]; then
+    echo "Invalid image: $IMG"
+    umount "$MNT" || true
+    exit 1
+fi
+
+echo
+echo "About to write:"
+echo "  Image: $IMG"
+echo "  Target: $EMMC_DEV"
+echo
+
+printf "Type 'YES' to continue: "
+read -r CONFIRM
+
+if [ "$CONFIRM" != "YES" ]; then
+    echo "Aborted."
+    umount "$MNT" || true
+    exit 1
+fi
+
+echo "[*] Flashing..."
+gunzip -c "$IMG" > "$EMMC_DEV"
+
+echo "[*] Syncing..."
+sync
+
+echo "[*] Done."
+umount "$MNT" || true
+
+echo "[*] Rebooting..."
+reboot -f