mount_vacant_space

#!/bin/sh /etc/rc.common
# Unlock MTD partitions at startup
START=10

# 20250213 初版
# 20250225 I-O DATA WN-DX1200GRを追加

# スクリプト名を取得
SCRIPT_NAME=$(basename "$0")

# モデル名を取得
MODEL=$(ubus call system board | jsonfilter -e '@.model')

# モデルに応じた MTD_NUM と UBI_VOLUME の設定
case "$MODEL" in
    "Buffalo WSR-3200AX4S")
        MTD_NUM=11
        UBI_VOLUME="dpi"
        ;;
    "ELECOM WRC-X3200GST3")
        MTD_NUM=10
        UBI_VOLUME="dpi"
        ;;

    "I-O DATA WN-DX1200GR")
        MTD_NUM=6
        UBI_VOLUME="dpi"
        ;;

    *)
        echo "$SCRIPT_NAME: Unsupported model: $MODEL" > /dev/kmsg
        exit 1
        ;;
esac

# 成功した場合のログ出力
echo "$SCRIPT_NAME: Model detected: $MODEL, MTD_NUM=$MTD_NUM, UBI_VOLUME=$UBI_VOLUME" > /dev/kmsg

# 変数定義
MTD_DEV="/dev/mtd$MTD_NUM"
MOUNT_POINT="/mnt/vacant_space"

boot() {
    echo "$SCRIPT_NAME: Unlocking MTD partitions..." > /dev/kmsg

    # 1. insmod mtd-rw
    if insmod mtd-rw i_want_a_brick=1; then
        echo "$SCRIPT_NAME: insmod mtd-rw successful" > /dev/kmsg
    else
        echo "$SCRIPT_NAME: insmod mtd-rw failed" > /dev/kmsg
    fi

    # 2. mtd unlock
    if mtd unlock "$MTD_DEV"; then
        echo "$SCRIPT_NAME: mtd unlock $MTD_DEV successful" > /dev/kmsg
    else
        echo "$SCRIPT_NAME: mtd unlock $MTD_DEV failed" > /dev/kmsg
    fi

    # 3. ubiattach
    if ubiattach -m "$MTD_NUM"; then
        echo "$SCRIPT_NAME: ubiattach -m $MTD_NUM successful" > /dev/kmsg
    else
        echo "$SCRIPT_NAME: ubiattach -m $MTD_NUM failed" > /dev/kmsg
    fi

    # 'UBI_VOLUME' ボリュームを含む UBI デバイスの特定
    ubi_dev=""
    for dev in /dev/ubi[0-9]*; do
        if ubinfo "$dev" -a | grep -q "Name: *$UBI_VOLUME"; then
            ubi_dev="${dev#/dev/}"
            break
        fi
    done

    if [ -z "$ubi_dev" ]; then
        echo "$SCRIPT_NAME: Failed to detect UBI device containing '$UBI_VOLUME' volume" > /dev/kmsg
        ubi_dev="ubi1"  # デフォルトで ubi1 を使用
    else
        echo "$SCRIPT_NAME: Detected UBI device: $ubi_dev" > /dev/kmsg
    fi

    # マウント処理
    mkdir -p "$MOUNT_POINT"
    if mount -t ubifs "$ubi_dev:$UBI_VOLUME" "$MOUNT_POINT"; then
        echo "$SCRIPT_NAME: Mount succeeded: '$UBI_VOLUME' volume mounted on $MOUNT_POINT" > /dev/kmsg
        # 容量を多く消費する /usr/sbin を空き地へ置き換える。bind でマウント
        if [ ! -d "$MOUNT_POINT/usr_sbin" ]; then
            mkdir -p "$MOUNT_POINT/usr_sbin"
            cp -a /usr/sbin/* "$MOUNT_POINT/usr_sbin"
        fi
        mount --bind "$MOUNT_POINT/usr_sbin" /usr/sbin
    else
        echo "$SCRIPT_NAME: Mount failed: Unable to mount '$UBI_VOLUME' volume on $MOUNT_POINT" > /dev/kmsg
        exit
    fi
}