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Implement an RAII wrapper around chdir().

hongyiweiwu requested to merge hongyiweiwu1/buildbox-common:yi/chdir-wrapper into master

Before raising this MR, consider whether the following are required, and complete if so:

  • Unit tests
  • Metrics
  • Documentation update(s)

If not required, please explain in brief why not.

Description

This PR adds a new utility class, ChdirWrapper, to the library. It is an RAII-managed wrapper around the linux chdir() function that reverts the current directory change when it goes out of scope.

Validation

Just run the unit test suites as usual. I have added unit tests that address this new class.

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