[BUG] Doesn't run in Node-RED/Alpine Linux

[AndreKR]

Describe the bug
This might be somewhat of a feature request but since there's an error message I'm using the bug template.

To Reproduce

1. Start a Docker container with Node.js that is based on Alpine Linux, for example nodered/node-red:

docker run -it --rm --entrypoint /bin/bash --user root nodered/node-red

2. Create some test scripts:

cd /
mkdir test
cd test
npm install imagescript
echo "import {Image} from 'imagescript'; const i = new Image(200, 200);" > test.mjs

3. Run the script:

node test.mjs

Actual behavior

An error message appears:

# node test.mjs
/test/node_modules/imagescript/codecs/node/index.js:3
catch (err) { throw new Error('unsupported arch/platform: ' + err.message); }
                    ^

Error: unsupported arch/platform: Error loading shared library ld-linux-aarch64.so.1: No such file or directory (needed by /test/node_modules/imagescript/codecs/node/bin/arm64-linux.node)
    at Object.<anonymous> (/test/node_modules/imagescript/codecs/node/index.js:3:21)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Module.require (node:internal/modules/cjs/loader:1100:19)
    at require (node:internal/modules/cjs/helpers:108:18)
    at Object.<anonymous> (/test/node_modules/imagescript/ImageScript.js:4:16)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)

Expected behavior
Script runs, no output

Platform:

• OS: Linux
• Environment: NodeJS in Docker
• Version: 1.2.16

Additional context
I tried apk add gcompat and apk add libc6-compat. It changes the error message into:

# node test.mjs
/test/node_modules/imagescript/codecs/node/index.js:3
catch (err) { throw new Error('unsupported arch/platform: ' + err.message); }
                    ^

Error: unsupported arch/platform: Error relocating /test/node_modules/imagescript/codecs/node/bin/arm64-linux.node: __memcpy_chk: symbol not found
    at Object.<anonymous> (/test/node_modules/imagescript/codecs/node/index.js:3:21)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Module.require (node:internal/modules/cjs/loader:1100:19)
    at require (node:internal/modules/cjs/helpers:108:18)
    at Object.<anonymous> (/test/node_modules/imagescript/ImageScript.js:4:16)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)

[AndreKR]

I just found out that Node-RED recently introduced Debian-based Docker images, so this isn't an actual concern for me.

[wtone]

只要是 docker node:*-alpine 镜像 就会有问题，在Docker node:18-alpine 镜像容器中，新建一个测试脚本

docker run -it --rm node18:alpine sh
mkdir test
cd test
npm init
npm i imagescript sharp

vi test.js

//test.js
const { arch, platform } = require('os');
console.log(arch(), platform())
try {
module.exports = require(imagescript/codecs/node/bin/${arch()}-${platform()}.node);
}catch (err) { throw new Error('unsupported arch/platform: ' + err.message); }

执行就会报错 ：Segmentation fault (core dumped)

同样的引用node原生模块，sharp库就不会报错
console.log(platformAndArch())
try {
module.exports = require(sharp/build/Release/sharp-${platformAndArch()}.node);
} catch (err) {
throw new Error('unsupported arch/platform: ' + err.message);
}

比较后，发现主要是因为platform这个变量取值以及Alpine 的 musl libc 兼容性问题，主要原因是：

1、musl 与 glibc 二进制不兼容
.node 文件是 Node.js 原生模块（C/C++ 编译的二进制文件），若该文件是在 glibc 系统（如 Ubuntu、CentOS）上编译的，而 Alpine 使用 musl libc，两者的二进制接口不兼容，会导致 Node.js 无法正确加载模块（即使文件存在）。

2、获取当前运行环境的平台信息的方式有问题：
// imagescript/codecs/node/index.js
const { arch, platform } = require('os');
module.exports = require(./bin/${arch()}-${platform()}.node);

简单通过os.platform获取的值，无法区分linux(Ubuntu、CentOS) 和 linuxmusl(Docker alpine容器)，可以参考 sharp库的做法写一个方法来获取platform和arch：
function platformAndArch() {
const arch = env.npm_config_arch || process.arch;
const platform = env.npm_config_platform || process.platform;
const libc = process.env.npm_config_libc ||
/* istanbul ignore next */
(detectLibc.isNonGlibcLinuxSync() ? detectLibc.familySync() : '');
const libcId = platform !== 'linux' || libc === detectLibc.GLIBC ? '' : libc;

const platformId = [];
if (arch === 'arm') {
    const fallback = process.versions.electron ? '7' : '6';
    platformId.push(`armv${env.npm_config_arm_version || process.config.variables.arm_version || fallback}`);
} else if (arch === 'arm64') {
    platformId.push(`arm64v${env.npm_config_arm_version || '8'}`);
} else {
    platformId.push(arch);
}
platformId.push(`${platform}${libcId}`);

return platformId.join('-');

}

在Docker alpine 容器中调用platformAndArch()将得到的platform和arch是 “x64-linuxmusl”

3、本身提供的imagescript/codecs/node/bin/*.node 文件中也没有包含支持x64-linuxmusl.node的文件
需要重新编译一份适配linuxmusl的模块文件（x64-linuxmusl.node），并添加到imagescript/codecs/node/bin/目录下。