Add the GNU diff tool implementation.

Review Request #12600 — Created Sept. 14, 2022 and submitted

chipx86
RBTools
release-4.x
12599
12601
rbtools

This introduces the first diff tool, GNUDiffTool. This wraps around
GNU Diff, properly checking search paths, building the correct command
line, and interpreting results.

If there are multiple diff executables found in the path, this will
end up checking each until it finds GNU Diff or exhausts all options.

The implementation handles all documented GNU Diff exit codes, providing
text vs. binary flags in the result (handling old legacy binary file
indicators) and all diff output.

This will be a step up from a lot of the GNU diff executions we
currently have in the codebase, and will let us remove a lot of
different forms of error handling, binary file support, and execute name
determination.

Unit tests passed.

Tested this with some in-progress changes to switch SCMClients over. They
successfully ran GNU Diff and handled the results.

Summary
Add the GNU diff tool implementation.
Description From Last Updated

Add a Version Added:.

maubinmaubin

Add a Version Added:.

maubinmaubin
chipx86
maubin
  1. 
      
  2. Add a Version Added:.

  3. Add a Version Added:.

  4. 
      
chipx86
david
  1. Ship It!
  2. 
      
chipx86
Review request changed

Status: Closed (submitted)

Change Summary:

Pushed to release-4.x (533d38e)
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