Git clone now fetches only HEAD^ history and has a timeout

[Brend-Smits]

Motivation

On large repositories, the process often got stuck and failed for some reason. This was difficult to diagnose due to lack of logging.

Proposed Changes

Only checkout the HEAD^ instead of the whole repository, with the entire history, including all of its branches and their history.
Include more logging as well as a time out of 1 second if the process is finished but stuck closing. This timeout is only triggered when the Git process has been stuck for 1 second.

Test Plan

Test with bin/repolinter.js -g https://github.com/microsoft/vscode and see the progress being reported like:

git.clone resolving stage 91% complete
git.clone resolving stage 92% complete
git.clone resolving stage 93% complete
git.clone resolving stage 94% complete
git.clone resolving stage 95% complete
git.clone resolving stage 96% complete
git.clone resolving stage 97% complete
git.clone resolving stage 98% complete
git.clone resolving stage 99% complete
git.clone resolving stage 100% complete
git.clone resolving stage 100% complete

Signed-off-by: Brend Smits [email protected]

[Brend-Smits]

Seems that some tests are failing, I will dive into why this is happening after dinner tonight.

[JeroenKnoops]

Awesome