[RFC PATCH 0/5] Add delta islands support

This patch series is upstreaming work made by GitHub and available in:

https://github.com/peff/git/commits/jk/delta-islands

The patch in the above branch has been split into 5 patches with their own new commit message, but no other change has been made.

I kept Peff as the author and took the liberty to add his Signed-off-by to all the patches.

The patches look good to me except perhaps that "pack.islandCore" is not documented. Maybe something could be added in Documentation/technical/ too, or maybe improving commit messages could be enough.

Anyway I wanted to send this nearly "as is" first to get early feedback about what should be done.

This patch series is also available on GitHub in:

https://github.com/chriscool/git/commits/delta-islands

Jeff King (5):
  packfile: make get_delta_base() non static
  Add delta-islands.{c,h}
  pack-objects: add delta-islands support
  repack: add delta-islands support
  t: add t9930-delta-islands.sh

 Documentation/config.txt           |   8 +
 Documentation/git-pack-objects.txt |  88 ++++++
 Documentation/git-repack.txt       |   5 +
 Makefile                           |   1 +
 builtin/pack-objects.c             | 130 +++++---
 builtin/repack.c                   |   9 +
 delta-islands.c                    | 490 +++++++++++++++++++++++++++++
 delta-islands.h                    |  11 +
 pack-objects.h                     |   4 +
 packfile.c                         |  10 +-
 packfile.h                         |   3 +
 t/t9930-delta-islands.sh           | 143 +++++++++
 12 files changed, 856 insertions(+), 46 deletions(-)
 create mode 100644 delta-islands.c
 create mode 100644 delta-islands.h
 create mode 100755 t/t9930-delta-islands.sh