[rush] 5.126.0+ fails to get git config on `rush install`

Summary

We use a GitHub Actions workflow in our repo to check that the shrinkwrap is in sync with our package.json files. The script runs rush install --check-only. However, since Rush 5.126.0, the command has been failing, saying

Unable to determine your Git configuration using this command:

    git config user.email

Repro steps

~~👉 Repository available at~~ Sorry, this issue is fixed so I deleted the repo. Here's the example worklow I was using, for historical purposes:

Example workflow

```yml name: Verify Rush shrinkwrap is up to date on: - pull_request - push jobs: check-shrinkwrap: runs-on: ubuntu-latest steps: - name: Checkout uses: actions/checkout@v4.1.6 - name: Check shrinkwrap with Rush run: node common/scripts/install-run-rush.js --debug install --check-only ```

rush init
run rush update to create scripts — The common/scripts directory is not included in rush init.
add a project so rush install works properly — rush install will complain if there's no dependencies & thus no shrinkwrap.
add a workflow that uses rush install — See the specific workflow I'm using above.
upgrade rushVersion to 5.125.1 — ✅ This is the last working version.
upgrade rushVersion to 5.126.0 — ❌ CI fails on this one for unclear reasons.

Expected result: rush install should work in CI without Git configured.

Actual result:

Error: Process exited with code 1 Unable to determine your Git configuration using this command:
```
git config user.email
```
Error: An error occurred. at Git.tryGetGitEmailAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/commons.js:13806:19) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async Module.validateAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/commons.js:23135:21) at async Module.validatePolicyAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/commons.js:23255:9) at async WorkspaceInstallManager.prepareAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/chunks/InstallManagerFactory.js:486:9) at async WorkspaceInstallManager.doInstallAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/chunks/InstallManagerFactory.js:363:83) at async WorkspaceInstallManager.doInstallAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/chunks/InstallManagerFactory.js:1355:9) at async InstallAction._doInstallAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/commons.js:7328:9) at async InstallAction.runAsync (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@microsoft/rush-lib/dist/commons.js:7303:17) at async RushCommandLineParser.onExecute (/home/runner/work/rush-repro/rush-repro/common/temp/install-run/@microsoft+rush@5.126.0/node_modules/@rushstack/ts-command-line/lib/providers/CommandLineParser.js:268:13)

Details

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
`@microsoft/rush` globally installed version?	none; using `install-run-rush.js` in CI
`rushVersion` from rush.json?	5.126.0
`useWorkspaces` from rush.json?	Can't find that in my `rush.json`..?
Operating system?	Linux
Would you consider contributing a PR?	Yes
Node.js version (`node -v`)?	18.20.3

microsoft / rushstack