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[PATCHv2 0/1] add git-p4 unshelve command

This is another attempt to make a "git p4 unshelve" command.

Unshelving in p4 is a bit like a cross between cherry-pick
and "am", and is very commonly used for review.

This command helps git users who want to try out a shelved
p4 change from some other repo:


   $ git p4 unshelve 12345
   unshelved CL12345 into refs/remotes/p4/unshelved/12345
   $ git show refs/remotes/p4/unshelved/12345

I abandoned an earlier attempt because it seemed like there
is no way to get around a rather nasty problem: git-p4
just constructs the commit and passes the file contents to
git-fastimport. But there's no easy way to construct the
*prior* commit, because Perforce doesn't record this
information, and so you can end up with other changes
mixed into the unshelved commit - these are the differences
between your tree and the other tree, for each file that
has been modified.

However, I think the command is sufficiently useful that
it's worth supporting anyway, even with that caveat.

I also tried to use "p4 describe" to get the deltas, but
that's very unsatisfactory: I found myself writing a
second-rate version of git's diff tool to try to make
up for the deficiencies in Perforce's diff tool.

It might be possible to reconstruct the missing base
commit information, but that's a reasonably tricky task.

I have incorporated some of the comments from the earlier
review rounds, in particular:

- no longer adds the [git-p4...] annotation in unshelve
- try to use .format() in place of %
- rename the target branch if it already exists

Luke Diamand (1):
  git-p4: add unshelve command

 Documentation/git-p4.txt |  26 ++++++
 git-p4.py                | 171 ++++++++++++++++++++++++++++++---------
 t/t9832-unshelve.sh      |  99 +++++++++++++++++++++++
 3 files changed, 260 insertions(+), 36 deletions(-)
 create mode 100755 t/t9832-unshelve.sh