我正在使用canvas package作为Node.js。
它在我的计算机上工作正常，但是当我将它上传到我的Heroku服务器时它不起作用。通过“工作正常”，我的意思是正确安装了npm install canvas的canvas包和Node.js应用程序按预期工作。
但是，当我尝试将其上传到Heroku并尝试构建canvas包时，我收到错误：
$ git push heroku master
Counting objects: 4304, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (4028/4028), done.
Writing objects: 100% (4304/4304), 3.57 MiB | 606.00 KiB/s, done.
Total 4304 (delta 737), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Using set buildpack heroku/nodejs
remote: -----> Node.js app detected
remote:
remote: -----> Creating runtime environment
remote:
remote: NPM_CONFIG_LOGLEVEL=error
remote: NPM_CONFIG_PRODUCTION=true
remote: NODE_ENV=production
remote: NODE_MODULES_CACHE=true
remote:
remote: -----> Installing binaries
remote: engines.node (package.json): 5.6.0
remote: engines.npm (package.json): 3.7.2
remote:
remote: Downloading and installing node 5.6.0...
remote: Downloading and installing npm 3.7.2 (replacing version 3.6.0)...
remote:
remote: -----> Restoring cache
remote: Skipping cache restore (new runtime signature)
remote:
remote: -----> Building dependencies
remote: Prebuild detected (node_modules already exists)
remote: Rebuilding any native modules
remote:
remote: > canvas@1.3.10 install /tmp/build_565c08c270a791191b278953392f5493/node_modules/canvas
remote: > node-gyp rebuild
remote:
remote: make: Entering directory `/tmp/build_565c08c270a791191b278953392f5493/node_modules/canvas/build'
remote: SOLINK_MODULE(target) Release/obj.target/canvas-postbuild.node
remote: COPY Release/canvas-postbuild.node
remote: CXX(target) Release/obj.target/canvas/src/Canvas.o
remote: CXX(target) Release/obj.target/canvas/src/CanvasGradient.o
remote: CXX(target) Release/obj.target/canvas/src/CanvasPattern.o
remote: In file included from ../src/CanvasPattern.cc:9:0:
remote: ../src/Image.h:19:21: fatal error: gif_lib.h: No such file or directory
remote: #include <gif_lib.h>
remote: ^
remote: compilation terminated.
remote: make: *** [Release/obj.target/canvas/src/CanvasPattern.o] Error 1
remote: make: Leaving directory `/tmp/build_565c08c270a791191b278953392f5493/node_modules/canvas/build'
remote: gyp ERR! build error
remote: gyp ERR! stack Error: `make` failed with exit code: 2
remote: gyp ERR! stack at ChildProcess.onExit (/tmp/build_565c08c270a791191b278953392f5493/.heroku/node/lib/node_modules/npm/node_module
s/node-gyp/lib/build.js:276:23)
remote: gyp ERR! stack at emitTwo (events.js:100:13)
remote: gyp ERR! stack at ChildProcess.emit (events.js:185:7)
remote: gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
remote: gyp ERR! System Linux 3.13.0-71-generic
remote: gyp ERR! command "/tmp/build_565c08c270a791191b278953392f5493/.heroku/node/bin/node" "/tmp/build_565c08c270a791191b278953392f5493/.h
eroku/node/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
remote: gyp ERR! cwd /tmp/build_565c08c270a791191b278953392f5493/node_modules/canvas
remote: gyp ERR! node -v v5.6.0
remote: gyp ERR! node-gyp -v v3.2.1
remote: gyp ERR! not ok
remote:
remote: npm ERR! Linux 3.13.0-71-generic
remote: npm ERR! argv "/tmp/build_565c08c270a791191b278953392f5493/.heroku/node/bin/node" "/tmp/build_565c08c270a791191b278953392f5493/.hero
ku/node/bin/npm" "rebuild"
remote: npm ERR! node v5.6.0
remote: npm ERR! npm v3.7.2
remote: npm ERR! code ELIFECYCLE
remote: npm ERR! canvas@1.3.10 install: `node-gyp rebuild`
remote: npm ERR! Exit status 1
remote: npm ERR!
remote: npm ERR! Failed at the canvas@1.3.10 install script 'node-gyp rebuild'.
remote: npm ERR! Make sure you have the latest version of node.js and npm installed.
remote: npm ERR! If you do, this is most likely a problem with the canvas package,
remote: npm ERR! not with npm itself.
remote: npm ERR! Tell the author that this fails on your system:
remote: npm ERR! node-gyp rebuild
remote: npm ERR! You can get information on how to open an issue for this project with:
remote: npm ERR! npm bugs canvas
remote: npm ERR! Or if that isn't available, you can get their info via:
remote: npm ERR! npm owner ls canvas
remote: npm ERR! There is likely additional logging output above.
remote:
remote: npm ERR! Please include the following file with any support request:
remote: npm ERR! /tmp/build_565c08c270a791191b278953392f5493/npm-debug.log
remote:
remote: -----> Build failed
remote:
remote: We're sorry this build is failing! You can troubleshoot common issues here:
remote: https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:
remote: Some possible problems:
remote:
remote: - node_modules checked into source control
remote: https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
remote:
remote: Love,
remote: Heroku
remote:
remote:
remote: ! Push rejected, failed to compile Node.js app
remote:
remote: Verifying deploy...
remote:
remote: ! Push rejected to colladraw.
remote:
To https://git.heroku.com/colladraw.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/colladraw.git'
错误具体在以下几行：
In file included from ../src/CanvasPattern.cc:9:0:
remote: ../src/Image.h:19:21: fatal error: gif_lib.h: No such file or directory
remote: #include <gif_lib.h>
remote: ^
remote: compilation terminated.
但是，我的系统上不存在这些问题。我摆弄了有关此问题的其他问题的解决方案，例如this question和this question。问题是这两个都是本地机器，并没有被推送到服务器，因此我无法解决Heroku上的问题。
可能的解决方案1
看起来Heroku正试图根据以下几行自行重建所有软件包：
remote: -----> Building dependencies
remote: Prebuild detected (node_modules already exists)
remote: Rebuilding any native modules
我猜想如果它没有重新构建node_modules并且只使用我的计算机中的那个（正在工作），那么它也可以在服务器上运行。有没有办法阻止它自动重建？
可能的解决方案2
Heroku允许您运行one-off dynos，例如heroku run bash。这将打开连接到服务器的bash客户端。
我在想，也许我可以直接在Heroku服务器上执行有关此问题的其他问题的解决方案。但是，它们非常严格，不允许sudo访问，也不允许apt-get install。有没有办法绕过这个？
随意提供其他想法。感谢任何解决方案。
答案 0 :(得分：1)
node-canvas依赖于Cairo，一个用C编写的图形库。开罗必须安装在您尝试部署到的任何服务器上。
如果要部署到Heroku，则可能必须使用自定义生成包。这里有关于如何执行此操作的示例文档：https://github.com/Automattic/node-canvas/wiki/Installation-on-Heroku