带有buildpack的heroku上的exec和PATH [英] exec and PATH on heroku with buildpacks

问题描述

我使用此buildpack 以便使用 casperjs 。

创建应用后，我会检查 PATH

Once my app created, I check my PATH

$ heroku config:get PATH
/usr/local/bin:/usr/bin:/bin:/app/vendor/phantomjs/bin:/app/vendor/casperjs/bin

好，casperjs在这里！

OK, casperjs is in here!

-

Procfile

scraper: node scraper.js

scraper.js

var exec = require('child_process').exec;
exec('casperjs casper-script.js');

-

但是当我启动时刮板过程中，它崩溃并显示以下日志：

But when I launch the scraper process, it crashes with the following logs:

2012-10-09T02:23:38+00:00 heroku[scraper.1]: Starting process with command `node scraper.js`
2012-10-09T02:23:39+00:00 app[scraper.1]: bash: node: command not found

---

为什么 exec 找不到 casperjs 其中在 PATH 中？

PS：我尝试使用 spawn 但没有更多的运气...

PS: I tried with spawn but no more luck...

：这里是可测试的要点 https：//gist.github .com / 3856317

: a testable gist here https://gist.github.com/3856317

推荐答案

G

@vinayr：您是对的，此问题未涉及 exec 或 casperjs 命令，这是节点，它是命令未找到的！

@vinayr: you were right, neither exec nor casperjs command was involved in this issue, it was node which was the command not found!

我认为应该使用 phantomjs 和 casperjs 安装一个buildpack（例如： heroku-buildpack-casperjs ）可以保留我应用程序的节点功能，但事实并非如此。

I thought installing a buildpack with phantomjs and casperjs (eg: heroku-buildpack-casperjs) would have kept node capabilities for my app, but it does not seem so.

要使其工作（node + phantomjs + casperjs），我宁愿使用 heroku-buildpack-nodejs buildpack并向其中添加 phantomjs / casperjs 二进制文件可能会调用： heroku-buildpack- nodejs -casperjs 。

To make it work (node+phantomjs+casperjs) I rather had to fork the heroku-buildpack-nodejs buildpack and add phantomjs/casperjs binaries to it, which I could have called: heroku-buildpack-nodejs-casperjs.

换句话说，当使用自定义buildpack，您必须包括自己的节点支持。

In other words, when using a custom buildpack, you have to include the node support yourself .

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