aws lambda 安装 SAM Local 遇到错误：EACCES: permission denied, mkdir

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aws lambda 安装 SAM Local 遇到错误：

> [email protected] postinstall /usr/local/lib/node_modules/aws-sam-local
> go-npm install

/usr/local/lib/node_modules/aws-sam-local/node_modules/mkdirp/index.js:90
                    throw err0;
                    ^

Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/aws-sam-local/bin'
    at Object.fs.mkdirSync (fs.js:885:18)
    at Function.sync (/usr/local/lib/node_modules/aws-sam-local/node_modules/mkdirp/index.js:71:13)
    at Object.install (/usr/local/lib/node_modules/aws-sam-local/node_modules/go-npm/bin/index.js:161:12)
    at Object.<anonymous> (/usr/local/lib/node_modules/aws-sam-local/node_modules/go-npm/bin/index.js:212:17)
    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 Function.Module.runMain (module.js:676:10)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] postinstall: `go-npm install`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/xxx/.npm/_logs/2018-03-28T08_17_57_066Z-debug.log           

解决方法：

添加参数：--unsafe-perm

完整命令：

sudo npm install -g aws-sam-local --unsafe-perm

--unsafe-perm 参数说明：

• unsafe-perm: 如果设置为true,则禁止UID/GID互相切换，当运行package scripts