Makefile中的路径不起作用 [英] path in makefile not working

问题描述

我正在运行以下makefile 需要将dir更改为特定目标并在其中运行npm install

Im running the following makefile which needs to change dir to specific target and run there npm install

问题是我能够在输出中看到它将目录(project/app)打印到正确的目录，但是安装(npm install)在升级(项目)时运行，为什么?

The problem is that I was able to see in the output that it print the directory (project/app) to the right directory but the installation (npm install) run on level up (project), why ?

例如

当我运行它时，我会从cd $ {DIR)/app中看到 /Users/i03432/go/src/project/app

When I run it I see from cd $(DIR)/app /Users/i03432/go/src/project/app

现在第二个命令是 npm install

我得到一个错误，即id在正确的项目路径中找不到包json ...它仅在app路径中.为什么CD不能正常工作?

And I got error that id doesn’t find the package json in the project path which is right... it’s only in the app path. Why the cd is not working ?

它试图在这里找到它 /Users/i03432/go/src/project/package.json

it try to find it here /Users/i03432/go/src/project/package.json

这是package.json

and here is the package.json

/Users/i03432/go/src/project/app/package.json

makefile是

module:

   DIR=$(PWD)
   @echo $(DIR)
   cd $(DIR)/app
   npm install

推荐答案

规则中的每个命令都在单个进程(子外壳)中运行.因此，您在环境上执行的每个更改都与该特定线路相关.您要将代码段更改为

Every command in a rule is run in a single process (sub-shell). Every change you perform on the environment is hence tied to that particular line. You want to change your snippet to

cd $(PWD)/app && npm install

此命令在单个子进程中运行，应产生期望的结果.请注意，DIR的定义也会发生此问题，因此您可能需要将此行向上移动几行:

This command runs in a single subprocess and should yield the desired result. Note that this problem occurs for the definition of DIR, too, so you might want to move this a few lines up:

DIR = $(PWD)

module:
    cd $(DIR) && npm install

这样，您引用的是make提供的变量，并且您在这里不依赖于子过程.

This way, you are referring to a variable that make provides, and you don't rely upon subprocesses here.

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