[PATCH v2 0/2] archive: Add --recurse-submodules to git-archive command

This makes it possible to include submodule contents in an archive command.

The inspiration for this change comes from this Github thread, https://github.com/dear-github/dear-github/issues/214, with at least 160 👍🏻 's at the time of writing. (I stumbled upon it because I wanted it as well).

I figured the underlying implementation wouldn't be too difficult with most of the plumbing already in place, so I decided to add the relevant logic to the client git-archive command.

One of the trickier parts of this implementation involved teaching read_tree about submodules. Some of the troublesome areas were still using the the_repository references to look up commit or tree or oid information. I ended up deciding that read_tree_fn_t would probably be best off having a concrete repo reference since it allows changing the context to a subrepo where needed (even though some of the usages did not need it specifically).

I am open to feedback since this is all quite new to me :)

TODO:

 * working implementation
 * valgrind
 * add regression tests
 * update documentation with new flag
 * submit to mailing list

Alphadelta14 (2):
  archive: add --recurse-submodules to git-archive command
  archive: fix a case of submodule in submodule traversal

 archive-tar.c                 | 14 +++--
 archive-zip.c                 | 14 ++---
 archive.c                     | 99 ++++++++++++++++++++++++-----------
 archive.h                     |  8 +--
 builtin/checkout.c            |  2 +-
 builtin/log.c                 |  2 +-
 builtin/ls-files.c            | 10 ++--
 builtin/ls-tree.c             | 16 +++---
 list-objects.c                |  2 +-
 merge-recursive.c             |  2 +-
 revision.c                    |  4 +-
 sparse-index.c                |  2 +-
 t/t5005-archive-submodules.sh | 84 +++++++++++++++++++++++++++++
 tree.c                        | 93 ++++++++++++++++++++++----------
 tree.h                        | 11 ++--
 wt-status.c                   |  2 +-
 16 files changed, 269 insertions(+), 96 deletions(-)
 create mode 100755 t/t5005-archive-submodules.sh

base-commit: e85701b4af5b7c2a9f3a1b07858703318dce365d
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1359%2FAlphadelta14%2Farchive-recurse-submodules-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1359/Alphadelta14/archive-recurse-submodules-v2
Pull-Request: https://github.com/git/git/pull/1359

Range-diff vs v1:

 1:  41664a59029 = 1:  41664a59029 archive: add --recurse-submodules to git-archive command
 -:  ----------- > 2:  68f7830c6d9 archive: fix a case of submodule in submodule traversal