在 nixos 上使用 yarn 运行时，elm-make 无法编译

Question

我正在与yarn 在nixos 上合作的elm 项目我无法编译。对于使用 macOS 的同事，该项目编译成功；可能我的机器上编译失败与我使用 NixOS 有关。

当我运行$ yarn start 时，我得到以下终端输出：

$ yarn start
yarn start v0.20.3
$ webpack-dev-server --env dev 
env dev
Project is running at http://0.0.0.0:3000/
webpack output is served from /
Content not from webpack is served from /home/matthew/backup/azara_work/platform/web/src
404s will fallback to /index.html
Running elm-make /home/matthew/backup/azara_work/platform/web/src/App.elm --yes --warn --debug --output /tmp/117814-7766-1wq3nh5.xanii6yldi.js

当我尝试在http://0.0.0.0:3000/ 加载页面时，我的浏览器控制台显示以下错误：

VM1496:1 Uncaught Error: Module build failed: Error: Compiler process exited with error Compilation failed
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: spawn /home/matthew/backup/azara_work/platform/web/node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make ENOENT
    at exports._errnoException (util.js:1018:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
    at onErrorNT (internal/child_process.js:367:16)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickCallback (internal/process/next_tick.js:104:9)
    at Module.runMain (module.js:606:11)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:504:3

    at ChildProcess.<anonymous> (/home/matthew/backup/azara_work/platform/web/node_modules/node-elm-compiler/index.js:141:27)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:891:16)
    at Socket.<anonymous> (internal/child_process.js:342:11)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at Pipe._handle.close [as _onclose] (net.js:497:12)
    at exports._errnoException (util.js:1018:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
    at onErrorNT (internal/child_process.js:367:16)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickCallback (internal/process/next_tick.js:104:9)
    at Module.runMain (module.js:606:11)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:504:3

    at ChildProcess.<anonymous> (/home/matthew/backup/azara_work/platform/web/node_modules/node-elm-compiler/index.js:141:27)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:891:16)
    at Socket.<anonymous> (internal/child_process.js:342:11)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at Pipe._handle.close [as _onclose] (net.js:497:12)
    at eval (eval at ./src/App.elm (http://0.0.0.0:3000/index.js:4316:1), <anonymous>:1:7)
    at Object../src/App.elm (http://0.0.0.0:3000/index.js:4316:1)
    at __webpack_require__ (http://0.0.0.0:3000/index.js:658:30)
    at fn (http://0.0.0.0:3000/index.js:86:20)
    at eval (eval at ./src/index.js (http://0.0.0.0:3000/index.js:4324:1), <anonymous>:7:13)
    at Object../src/index.js (http://0.0.0.0:3000/index.js:4324:1)
    at __webpack_require__ (http://0.0.0.0:3000/index.js:658:30)
    at fn (http://0.0.0.0:3000/index.js:86:20)
    at Object.0 (http://0.0.0.0:3000/index.js:4333:18)
    at __webpack_require__ (http://0.0.0.0:3000/index.js:658:30)

和

./src/App.elm
Module build failed: Error: Compiler process exited with error Compilation failed
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: spawn /home/matthew/backup/azara_work/platform/web/node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make ENOENT
    at exports._errnoException (util.js:1018:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
    at onErrorNT (internal/child_process.js:367:16)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickCallback (internal/process/next_tick.js:104:9)
    at Module.runMain (module.js:606:11)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:504:3

    at ChildProcess.<anonymous> (/home/matthew/backup/azara_work/platform/web/node_modules/node-elm-compiler/index.js:141:27)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:891:16)
    at Socket.<anonymous> (internal/child_process.js:342:11)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at Pipe._handle.close [as _onclose] (net.js:497:12)
 @ ./src/index.js 2:12-32
 @ multi (webpack)-dev-server/client?http://0.0.0.0:3000 webpack/hot/dev-server ./src/index.js

看来问题可能与elm-make 有关，因为这两个错误都出现了。我的路径在

找到elm-make

$ which elm-make
/home/matthew/.nix-profile/bin/elm-make

与错误报告它试图查找的路径不同elm-make (/home/matthew/backup/azara_work/platform/web/node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make)。我想知道这是否与问题有关。

在错误中列出的目录中，elm-make 在通过ls 列出时似乎确实存在：

$ ls /home/matthew/backup/azara_work/platform/web/node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/
elm  elm-make  elm-package  elm-reactor  elm-repl

但是，当我尝试运行yarn start 的输出中列出的命令时，除了用此节点模块路径中的 elm-make 替换 elm-make 之外，我收到“没有这样的文件或目录”错误。

$ ./node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make /home/matthew/backup/azara_work/platform/web/src/App.elm --yes --warn --debug --output /tmp/117814-7422-1p5ad15.q2uqqzd7vi.js
-bash: ./node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make: No such file or directory

当通过ls 列出可执行文件时清晰可见时，为什么我在尝试运行此“节点模块”elm-make 时会收到此“没有此类文件或目录”错误？

编译失败是因为我的路径elm-make 和“node-modules”下的另一个路径位置不同吗？也许纱线使用了错误的。如果是这样，我该如何设置纱线以使用正确的elm-make？

如何让yarn start 成功编译项目？

非常感谢您的建议；我已经被困了一段时间了。

Answer 1

我建议您将 elm 安装为 NixOS 的可选（不知何故）。如果您创建一个每个人都使用的 shell.nix，并且完全避免通过 npm 依赖 nix，通常是最简单的。

elm-make 不存在的原因是 ELF 解释器，它位于 NixOS 的不同位置。

试试ldd ./node_modules/elm/Elm-Platform/0.18.0/.cabal-sandbox/bin/elm-make

快速解决方法是将ls -la $(nix-build -A elmPackages.elm '<nixpkgs>')/bin 中的所有二进制文件符号链接到您的阴谋集团沙箱。