[jgit-dev] Preserve/Prune Old Pack Files

[jmelvin@xxxxxxxxxxxxxx]

We’ve noticed cases where Stale File Handle Exceptions occur during git 
operations, which can happen on users of NFS repos when repacking is 
done on them.

To address this issue, we’ve added two new options to the JGit GC 
command:

--preserve-oldpacks: moves old pack files into the preserved 
subdirectory instead of deleting them after repacking

--prune-preserved: prunes old pack files from the preserved subdirectory 
after repacking, but before potentially moving the latest old pack files 
to this subdirectory

The strategy is to preserve old pack files around until the next repack 
with the hopes that they will become unreferenced by then and not cause 
any exceptions to running processes when they are finally deleted 
(pruned).

Change is uploaded for review here: https://git.eclipse.org/r/#/c/87969/

Thanks,
James

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