[PATCHv1] git-p4: label import, tag export

[Luke Diamand <luke@diamand.org>]

This is an updated version of my earlier RFC/patch for importing
p4 labels into git, incorporating comments from Pete Wyckoff,
and git export support.

It operates by getting the sets of git tags and p4 labels, finding
out what is missing, and creating tags/labels as necessary. This
is in contrast to the existing detect-labels code which looks
for p4 labels associated with the changelist being imported and
which therefore misses tags on older changelists.

Git tag export is done during the sync phase because that's when
the commit/changelist mapping is first known.

There is also a small fix to t9800 for a problem I found while
testing this.

Luke Diamand (2):
  git-p4: fix t9800 editor check
  git-p4: import/export of labels to/from p4

 Documentation/git-p4.txt       |   39 ++++++-
 contrib/fast-import/git-p4     |  249 ++++++++++++++++++++++++++++++++++------
 t/t9800-git-p4-basic.sh        |    4 +-
 t/t9811-git-p4-label-import.sh |  145 +++++++++++++++++++++++
 4 files changed, 400 insertions(+), 37 deletions(-)
 create mode 100755 t/t9811-git-p4-label-import.sh

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1.7.10.rc0.158.gd9e55