unblock source build failing due to fatal: transport 'file' not allowed error

[kartheekp-ms]

Bug

Fixes: https://github.com/NuGet/Client.Engineering/issues/1927

Regression? Last working version:

Description

Source build started failing on CI resulting in private and official build failures.

Creating empty clone at: /home/vsts/work/1/s/artifacts/source-build/self/src/submodules/Common
  Cloning into '/home/vsts/work/1/s/artifacts/source-build/self/src/submodules/Common'...
  fatal: transport 'file' not allowed
  fatal: run_command returned non-zero status for submodules/Common
  .
/home/vsts/.nuget/packages/microsoft.dotnet.arcade.sdk/6.0.0-beta.21309.7/tools/SourceBuild/SourceBuildArcadeBuild.targets(147,5): error MSB3073: The command "git submodule foreach --recursive '/home/vsts/.nuget/packages/microsoft.dotnet.arcade.sdk/6.0.0-beta.21309.7/tools/SourceBuild/git-clone-to-dir.sh  --source . --dest "/home/vsts/work/1/s/artifacts/source-build/self/src/$sm_path" --copy-wip --clean'" exited with code 128. [/home/vsts/.nuget/packages/microsoft.dotnet.arcade.sdk/6.0.0-beta.21309.7/tools/Build.proj]
##[error]PowerShell exited with code '1'.
Finishing: Build source-build

@zivkan identified that this failure is related to following issues.

• Git submodule tests started failing after security patch dart-lang/pub#3617
• https://bugs.launchpad.net/ubuntu/+source/git/+bug/1993586

The work around suggested in the above issues is to run git config --global protocol.file.allow always command.

https://vielmetti.typepad.com/logbook/2022/10/git-security-fixes-lead-to-fatal-transport-file-not-allowed-error-in-ci-systems-cve-2022-39253.html blog explains how different repositories responded to this issue. Majority of them executed the above workaround.

For example, another Microsoft repo applied the same work around. https://github.com/microsoft/go-infra/pull/71/files

PR Checklist

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• PR has a linked issue.

• Described changes

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