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pr-539/hanwen/reftable-v10

This adds the reftable library, and hooks it up as a ref backend.

Includes testing support, to test: make -C t/ GIT_TEST_REFTABLE=1

Summary 18816 tests pass 2994 tests fail

Some issues:

 * worktree support looks broken
 * no detection for file/dir conflicts. You can have branch {a, a/b}
   simultaneously.
 * submodules (eg. t1013)
 * many tests inspect .git/logs/ directly.

v13

 * Avoid exposing tombstones from reftable_stack to git
 * Write peeled tags
 * Fix GC issue: use git-refpack in test
 * Fix unborn branches: must propagate errno from read_raw_ref.
 * add GIT_TEST_REFTABLE environment to control default.
 * add REFTABLE test prerequisite.
 * fix & test update-ref -d.
 * print error message for failed update-ref transactions.

Han-Wen Nienhuys (11):
  refs.h: clarify reflog iteration order
  Iterate over the "refs/" namespace in for_each_[raw]ref
  create .git/refs in files-backend.c
  refs: document how ref_iterator_advance_fn should handle symrefs
  Add .gitattributes for the reftable/ directory
  reftable: define version 2 of the spec to accomodate SHA256
  reftable: clarify how empty tables should be written
  Add reftable library
  Reftable support for git-core
  Add some reftable testing infrastructure
  t: use update-ref and show-ref to reading/writing refs

Jonathan Nieder (1):
  reftable: file format documentation

 Documentation/Makefile                        |    1 +
 Documentation/technical/reftable.txt          | 1080 ++++++++++++++++
 .../technical/repository-version.txt          |    7 +
 Makefile                                      |   26 +-
 builtin/clone.c                               |    3 +-
 builtin/init-db.c                             |   63 +-
 cache.h                                       |    6 +-
 refs.c                                        |   33 +-
 refs.h                                        |    8 +-
 refs/files-backend.c                          |    6 +
 refs/refs-internal.h                          |    6 +
 refs/reftable-backend.c                       | 1045 +++++++++++++++
 reftable/.gitattributes                       |    1 +
 reftable/LICENSE                              |   31 +
 reftable/README.md                            |   11 +
 reftable/VERSION                              |    5 +
 reftable/basics.c                             |  209 +++
 reftable/basics.h                             |   53 +
 reftable/block.c                              |  425 ++++++
 reftable/block.h                              |  124 ++
 reftable/blocksource.h                        |   22 +
 reftable/bytes.c                              |    0
 reftable/config.h                             |    1 +
 reftable/constants.h                          |   21 +
 reftable/dump.c                               |   97 ++
 reftable/file.c                               |   98 ++
 reftable/iter.c                               |  234 ++++
 reftable/iter.h                               |   60 +
 reftable/merged.c                             |  327 +++++
 reftable/merged.h                             |   36 +
 reftable/pq.c                                 |  115 ++
 reftable/pq.h                                 |   34 +
 reftable/reader.c                             |  754 +++++++++++
 reftable/reader.h                             |   68 +
 reftable/record.c                             | 1126 ++++++++++++++++
 reftable/record.h                             |  121 ++
 reftable/reftable.h                           |  527 ++++++++
 reftable/slice.c                              |  224 ++++
 reftable/slice.h                              |   76 ++
 reftable/stack.c                              | 1151 +++++++++++++++++
 reftable/stack.h                              |   44 +
 reftable/system.h                             |   53 +
 reftable/tree.c                               |   67 +
 reftable/tree.h                               |   34 +
 reftable/update.sh                            |   23 +
 reftable/writer.c                             |  661 ++++++++++
 reftable/writer.h                             |   60 +
 reftable/zlib-compat.c                        |   92 ++
 repository.c                                  |    2 +
 repository.h                                  |    3 +
 setup.c                                       |   12 +-
 t/t0002-gitfile.sh                            |    2 +-
 t/t0031-reftable.sh                           |   99 ++
 t/t1400-update-ref.sh                         |   32 +-
 t/t1506-rev-parse-diagnosis.sh                |    2 +-
 t/t3210-pack-refs.sh                          |    6 +
 t/t6050-replace.sh                            |    2 +-
 t/t9020-remote-svn.sh                         |    4 +-
 t/test-lib.sh                                 |    5 +
 59 files changed, 9378 insertions(+), 60 deletions(-)
 create mode 100644 Documentation/technical/reftable.txt
 create mode 100644 refs/reftable-backend.c
 create mode 100644 reftable/.gitattributes
 create mode 100644 reftable/LICENSE
 create mode 100644 reftable/README.md
 create mode 100644 reftable/VERSION
 create mode 100644 reftable/basics.c
 create mode 100644 reftable/basics.h
 create mode 100644 reftable/block.c
 create mode 100644 reftable/block.h
 create mode 100644 reftable/blocksource.h
 create mode 100644 reftable/bytes.c
 create mode 100644 reftable/config.h
 create mode 100644 reftable/constants.h
 create mode 100644 reftable/dump.c
 create mode 100644 reftable/file.c
 create mode 100644 reftable/iter.c
 create mode 100644 reftable/iter.h
 create mode 100644 reftable/merged.c
 create mode 100644 reftable/merged.h
 create mode 100644 reftable/pq.c
 create mode 100644 reftable/pq.h
 create mode 100644 reftable/reader.c
 create mode 100644 reftable/reader.h
 create mode 100644 reftable/record.c
 create mode 100644 reftable/record.h
 create mode 100644 reftable/reftable.h
 create mode 100644 reftable/slice.c
 create mode 100644 reftable/slice.h
 create mode 100644 reftable/stack.c
 create mode 100644 reftable/stack.h
 create mode 100644 reftable/system.h
 create mode 100644 reftable/tree.c
 create mode 100644 reftable/tree.h
 create mode 100755 reftable/update.sh
 create mode 100644 reftable/writer.c
 create mode 100644 reftable/writer.h
 create mode 100644 reftable/zlib-compat.c
 create mode 100755 t/t0031-reftable.sh

base-commit: e870325ee8575d5c3d7afe0ba2c9be072c692b65

Submitted-As: https://lore.kernel.org/git/pull.539.v10.git.1588018418.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.git.1579808479.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v2.git.1580134944.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v3.git.1580848060.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v4.git.1581029756.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v5.git.1581344060.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v6.git.1582015420.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v7.git.1582706986.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v8.git.1585740538.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.v9.git.1587417295.gitgitgadget@gmail.com
Assets 2