CentOS上安装remix-ide错误及解决方法

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remix-ide安装文档：https://github.com/ethereum/remix-ide

本机环境：

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> lsb_release -a
LSB Version:	:core-4.1-amd64:core-4.1-noarch
Distributor ID:	CentOS
Description:	CentOS Linux release 7.4.1708 (Core)
Release:	7.4.1708
Codename:	Core

> node --version
v8.9.3

> npm --version
6.1.0

安装

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> npm install remix-ide -g

启动

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> remix-ide

然后报错了…，错误信息如下：

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Error: Cannot find module './build/Release/scrypt'
    at Function.Module._resolveFilename (module.js:536:15)
    at Function.Module._load (module.js:466:25)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/scrypt/index.js:3:20)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/scrypt.js/node.js:1:76)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/web3-eth-accounts/src/index.js:35:16)
    at Module._compile (module.js:635:30)

看异常信息，应该是缺少scrypt包，检查系统node_modules目录

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> ll /services/apps/node-v8.9.3-linux-x64/lib/node_modules/

确实没有scrypt

然后安装scrpt
scrpt文档 https://www.npmjs.com/package/scrypt
具体执行步骤：

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> npm install -g node-gyp
> npm install -g scrypt

在安装node-gyp时，又报了一个错误：WARN EACCES user “root” does not have permission to access the dev dir
解决方案：https://github.com/nodejs/node-gyp/issues/454
具体解决办法就是安装时加上--unsafe-perm参数

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> npm install --unsafe-perm --verbose -g node-gyp

安装完scrypt后，执行remix-ide仍然报错，继续探索，终于找到了解决方案
https://github.com/barrysteyn/node-scrypt/issues/108

具体执行

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> cd /services/apps/node-v8.9.3-linux-x64/lib/node_modules/scrypt
> node-gyp configure build

编译成功

最后再执行remix-ide，完美，成功启动