git-rev-list in local commit order

Attached is a preliminary hackish patch to sort git-rev-list in local
commit order.   While I don't know how useful this really is, it's
presented as an alternative to the repo-id proposal.  This will work even
if the branch happens to be from a single repository, where repo-id will
not.  However, shared commit objects can cause problems so for best
results use private commit objects for each repository.

For purposes of testing, this patch changes the Cogito default of linking
objects to copying, for local repository pull operations.   This patch
will work with _existing_ repositories where local commit times have been
maintained.

Also attached, is a little test script that demonstrates the local commit
time order.  After running the test script, you can use the cg-log command
in each of the M and R directories to see the difference even though the
two repositories share a head commit.

This patch is not nearly ready for inclusion anywhere just meant for
comment.  It is based off Petr's cogito tree (commit
fa6e9eb368e949e78c4e66217461cf624b52b0a2).

 cache.h     |    1
 cg-pull     |    4 -
 commit.c    |  121
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 commit.h    |    6 ++
 rev-list.c  |    2
 sha1_file.c |    8 +++
 6 files changed, 137 insertions(+), 5 deletions(-)

Sean




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