[HIVE-18443] Ensure git gc finished in ptest prep phase before copying repo

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Testing Infrastructure
• Assignee: Ádám Szita
• Reporter: Ádám Szita
• Created: 11/Jan/18 15:57
• Updated: 22/May/18 23:14
• Resolved: 15/Jan/18 10:03

Description

In ptest's prep phase script first we checkout the latest Hive code from git, and then we make copy of its contents (along .git folder) for that will serve as Yetus' working directory.

In some cases we can see errors such as

+ cp -R . ../yetus
cp: cannot stat ?./.git/gc.pid?: No such file or directory

e.g. here

This is caused by git running its gc feature in the background when our prep script has already started copying. In cases where gc finishes while cp is running, we'll get this error