[JGIT PATCH 0/4] Racy pack directory fixes

I noticed some "racy git" sort of problems with the pack directory.
I suspect JGit read the pack directory while a concurrent `git gc`
was still writing the outputs, leaving JGit missing a large part
of the repository because it never saw the final state.  This short
series fixes it.

Unrelated to my other two series already sent today.

Shawn O. Pearce (4):
  Avoid unnecessary stat when scanning packs in the objects directory
  Make ObjectDirectory last modified time atomically updated with list
  Don't create new pack lists if the directory hasn't changed
  Fix racy condition when a repository is repacked

 .../src/org/spearce/jgit/lib/ObjectDirectory.java  |  235 ++++++++++++-------
 1 files changed, 148 insertions(+), 87 deletions(-)