feat: 拆分并编排 Image Builder 构建流程

init.sh

@@ -1,11 +1,25 @@
 #!/bin/bash
 
-# 安装依赖
-apt install -y build-essential libncurses-dev zlib1g-dev gawk git \
-gettext libssl-dev xsltproc rsync wget unzip python3 qemu-utils mkisofs zstd 
+# 安装 Image Builder 构建所需依赖
+install() {
+  apt install -y build-essential libncurses-dev zlib1g-dev gawk git \
+    gettext libssl-dev xsltproc rsync wget unzip python3 qemu-utils mkisofs zstd
+}
 
-# 下载并解压image builder
-version="25.12.0"
-file="immortalwrt-imagebuilder-$version-x86-64.tar.zst"
-url="https://downloads.immortalwrt.org/releases/$version/targets/x86/64/immortalwrt-imagebuilder-$version-x86-64.Linux-x86_64.tar.zst"
-wget  -q --show-progress -O $file $url && tar -I zstd -xvf $file 
+# 下载并解压 x86-64 的 Image Builder
+# 参数 1: ImmortalWrt 版本号，例如 25.12.0
+# 输出: 解压后的 Image Builder 目录绝对路径
+download_imagebuilder() {
+  local version="$1"
+  local file="immortalwrt-imagebuilder-$version-x86-64.Linux-x86_64.tar.zst"
+  local url="https://downloads.immortalwrt.org/releases/$version/targets/x86/64/$file"
+  local folder
+
+  wget -q --show-progress -O "$file" "$url" >&2
+
+  folder="$(tar -I zstd -tf "$file" | head -n 1 | cut -d/ -f1)"
+
+  tar -I zstd -xvf "$file" >&2
+
+  echo "$(pwd)/$folder"
+}