Have you ever built a sandbox environment or someone at your company has built one and it is time to download and unpack the updates for some of the different systems within the sandbox. All of a sudden you get an unpacker failed error come across the screen. The solution is quite simple but what most people struggle to understand is that there are two type of Unpacker errors to solve for. Unless you are the exact person who created the sandbox, you may not even know the difference yet. The two different types of unpackers are a single user remote repository and a multiple user remote repository.
A single user remote repository unpacker error is caused by the local repository being corrupted. This simple error and fix can be resolved by cloning your remote repository to another directory location and try to push the “git repack” command again. When all is said and done, the “git repack” should solve for any corruption that may have taken place remotely. For a multiple users having a failed unpacker error, the true cause is something a little different. The remote hosting server has a Stash level that is full. To remediate this issue you simple need to clear the stash log and push again.
Now there are several ways to prevent this unpacker error form even occurring or when it does occur, have a notification sent to you so no time is wasted troubleshooting the same errors. Simply finding the error that is produced and appending a note to it with a text file explaining what the issue is and how to avoid it will suffice for most people. But if you are a more proactive person and want to avoid ever having to deal with this issue again, then you should find out which unpacker error you are receiving and go back into the remote repository source code and append a string that will automatically correct the issue for you without you even knowing it. For example, if the issue is that you simply need to clear the stash log every time it gets to a certain level, you will want a code that will run a command to enable the stash log to be cleared once the repository reaches its specified threshold.
There may be other use case and examples that people are getting the unpacker error for. The best overall solution is to learn where the error occurs in the logs at least one time, create a notification or automatic solution for the error, then move on and be done with it. Knowing that if you do indeed see the unpacker error again it will be for a different reason.