compile_pkgs: use flock to not colide in git mirrors

This locks git mirror directory when we are updating mirrors. This should solve race condition with multiple builds failing to update mirrors and failing that way completely.

Only update is protected. The expectation is that initialization is happenning only once and is protected by non-existence of directory. If there is going to be problem with initialization as well then we can add locking as well.

added Bug Low labels

I am not sure about the overall functionality, however the code looks good.

assigned to @kkoci and unassigned @vmyslivec

added 2 commits

• be49424d - 1 commit from branch hbk
• a621a7d7 - compile_pkgs: use flock to not colide in git mirrors

Compare with previous version

merged