问题

I have cloned a git repository it's an Angular 7 ASP.NET app, everything is fine in the project but when I try to restore npm packages I get the error below.

\Microsoft\TeamFoundation\Team Explorer\Git\cmd\git.EXE submodule update - q --init --recursive fatal: 'submodule' appears to be a git command, but we were not able to execute it. Maybe git-submodule is broken? at ChildProcess.exithandler (child_process.js:291:12) at ChildProcess.emit (events.js:182:13) at maybeClose (internal/child_process.js:961:16) at Process.ChildProcess._handle.onexit (internal/child_process.js:248:5) npm ERR! cb() never called!

Package.json

{
 "name": "name",
 "version": "6.1.1",
 "license": "......",
 "scripts": {
   "ng": "ng",
   "start": "ng serve --open",
   "start-hmr": "ng serve --configuration hmr -sm=false",
   "start-hmr-sourcemaps": "ng serve --hmr -e=hmr",
   "build": "node --max_old_space_size=6144 ./node_modules/@angular/cli/bin/ng build --dev",
   "build-stats": "node --max_old_space_size=6144 ./node_modules/@angular/cli/bin/ng build --dev --stats-json",
   "build-prod": "node --max_old_space_size=6144 ./node_modules/@angular/cli/bin/ng build --prod",
   "build-prod-stats": "node --max_old_space_size=6144 ./node_modules/@angular/cli/bin/ng build --prod --stats-json",
   "test": "ng test",
   "lint": "ng lint",
   "e2e": "ng e2e",
   "bundle-report": "webpack-bundle-analyzer dist/stats.json"
},
"private": true,
"dependencies": {
  "@agm/core": "1.0.0-beta.3",
  "@angular/animations": "6.0.5",
  "@angular/cdk": "6.2.1",
  "@angular/common": "6.0.5",
  "@angular/compiler": "6.0.5",
  "@angular/core": "6.0.5" 
},
"devDependencies": {
  "@angular-devkit/build-angular": "0.6.8",
  "@angular/cli": "6.0.8",
  "@angular/compiler-cli": "6.0.5",
  "@angular/language-service": "6.0.5",
  "@angularclass/hmr": "2.1.3",  
  "typescript": "2.7.2",
  "webpack-bundle-analyzer": "2.13.1"
  }
}

My installed node-version is 10.7.0 and npm-version is 6.4.1

I found on GitHub some issues like this and they added a fix in npm-lifecycle, so I installed the npm-lifecycle but I'm still getting the same error

回答1:

The submodule command is not built into the base git.exe binary, it is implemented as a shell script named git-submodule, which needs to be accessible from the %PATH%, and to be executable for the user who runs the action.

What is your %PATH% (or the %PATH% for your npm process) ?
Does it include the path to your git installation, which seems to be somewhere in \Microsoft\TeamFoundation\Team Explorer\Git\ ?
Does the user which runs the npm process have execution rights on git-submodule ?

回答2:

Git 2.24 (Q4 2019) will fix a possible cause for this error message, seen on Windows.

See commit 4e1a641 (24 Aug 2019) by Adam Roben (aroben).
^{(Merged by Junio C Hamano -- gitster -- in commit 6f21347, 30 Sep 2019)}

mingw: fix launching of externals from Unicode paths

If Git were installed in a path containing non-ASCII characters, commands such as git am and git submodule, which are implemented as externals, would fail to launch with the following error:
fatal: 'am' appears to be a git command, but we were not able to execute it.  
Maybe git-am is broken?
This was due to lookup_prog not being Unicode-aware. It was somehow missed in 85faec9 (Win32: Unicode file name support (except dirent), 2012-03-15, Git v2.1.0-rc0).

Note that the only problem in this function was calling GetFileAttributes() instead of GetFileAttributesW().
The calls to access() were fine because access() is a macro which resolves to mingw_access(), which already handles Unicode correctly.
But lookup_prog() was changed to use _waccess() directly so that we only convert the path to UTF-16 once.

To make things work correctly, we have to maintain UTF-8 and UTF-16 versions in tandem in lookup_prog().

回答3:

Probably you don't have Git for windows installed. What I did, and it seems to have worked for me, is to open the visual studio installer, then choose to "modify" the current installation and from "Individual Components" tab I checked "Git for Windows" (which was not checked).

After the installation I did not get the same error again.

来源：https://stackoverflow.com/questions/54672008/submodule-appears-to-be-a-git-command-but-we-were-not-able-to-execute-it

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node.js