当在nixos上运行纱线时，elm-make无法编译。

Question

我正在处理的elm项目yarn on nixos无法编译。该项目为正在使用macOS的同事成功编译；在我的计算机上编译失败可能与我使用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

当我试图在http://0.0.0.0:3000/加载页面时，我的浏览器控制台显示了以下错误：

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

看来这个问题可能与elm-make有关，因为这在两个错误中都会出现。我的路径发现elm-make在

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

它是一个与错误报告路径不同的位置，它试图查找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列表时确实存在。

$ 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输出中列出的命令时，除了在此节点模块路径上用elm-make替换elm-make之外，我会得到一个'No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

为什么在试图运行这个“节点-模块”elm-make时，当通过ls列表时可执行文件明显可见时，我会得到“没有这样的文件或目录”错误？

我的路径的elm-make和另一个路径在“节点-模块”下的路径位置不同，导致编译失败吗？也许纱线用错了。如果是这样，我如何设置纱线使用正确的elm-make

如何让yarn start成功编译该项目？

建议是非常感谢的，我已经坚持了一段时间了。

Answer 1

我建议您让NixOS的elm安装是可选的。通常，如果您创建一个每个人都使用并避免通过npm依赖于nix的shell.nix，通常最简单。

elm之所以不存在，是因为ELF解释器位于NixOS不同的位置。

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

快速修复将是将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沙箱中。