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pr-539/hanwen/reftable-v20

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

This is still based on next, as there are conflicts basing on master.

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

Summary 455 tests fail

v24

 * rebase
 * FETCH_HEAD special casing

Han-Wen Nienhuys (19):
  refs: add \t to reflog in the files backend
  Split off reading loose ref data in separate function
  t1400: use git rev-parse for testing PSEUDOREF existence
  Modify pseudo refs through ref backend storage
  Make HEAD a PSEUDOREF rather than PER_WORKTREE.
  Make refs_ref_exists public
  Treat CHERRY_PICK_HEAD as a pseudo ref
  Treat REVERT_HEAD as a pseudo ref
  Move REF_LOG_ONLY to refs-internal.h
  Iteration  over entire ref namespace is iterating over "refs/"
  Add .gitattributes for the reftable/ directory
  Add reftable library
  Add standalone build infrastructure for reftable
  Reftable support for git-core
  Read FETCH_HEAD as loose ref
  Hookup unittests for the reftable library.
  Add GIT_DEBUG_REFS debugging mechanism
  Add reftable testing infrastructure
  Add "test-tool dump-reftable" command.

Johannes Schindelin (1):
  vcxproj: adjust for the reftable changes

SZEDER Gábor (1):
  git-prompt: prepare for reftable refs backend

 Documentation/git-update-ref.txt              |   13 +-
 .../technical/repository-version.txt          |    7 +
 Makefile                                      |   47 +-
 builtin/clone.c                               |    4 +-
 builtin/commit.c                              |   34 +-
 builtin/init-db.c                             |   55 +-
 builtin/merge.c                               |    2 +-
 builtin/worktree.c                            |   29 +-
 cache.h                                       |    8 +-
 config.mak.uname                              |    2 +-
 contrib/buildsystems/Generators/Vcxproj.pm    |   11 +-
 contrib/completion/git-prompt.sh              |    7 +-
 path.c                                        |    2 -
 path.h                                        |    9 +-
 ref-filter.c                                  |    7 +-
 refs.c                                        |  171 +-
 refs.h                                        |    6 +
 refs/debug.c                                  |  387 +++++
 refs/files-backend.c                          |   45 +-
 refs/refs-internal.h                          |   20 +
 refs/reftable-backend.c                       | 1415 +++++++++++++++++
 reftable/.gitattributes                       |    1 +
 reftable/BUILD                                |  203 +++
 reftable/LICENSE                              |   31 +
 reftable/README.md                            |   33 +
 reftable/VERSION                              |    1 +
 reftable/WORKSPACE                            |   14 +
 reftable/basics.c                             |  215 +++
 reftable/basics.h                             |   53 +
 reftable/block.c                              |  432 +++++
 reftable/block.h                              |  129 ++
 reftable/block_test.c                         |  157 ++
 reftable/compat.c                             |   98 ++
 reftable/compat.h                             |   48 +
 reftable/constants.h                          |   21 +
 reftable/dump.c                               |  212 +++
 reftable/file.c                               |   95 ++
 reftable/iter.c                               |  242 +++
 reftable/iter.h                               |   72 +
 reftable/merged.c                             |  317 ++++
 reftable/merged.h                             |   43 +
 reftable/merged_test.c                        |  286 ++++
 reftable/pq.c                                 |  115 ++
 reftable/pq.h                                 |   34 +
 reftable/reader.c                             |  744 +++++++++
 reftable/reader.h                             |   65 +
 reftable/record.c                             | 1126 +++++++++++++
 reftable/record.h                             |  143 ++
 reftable/record_test.c                        |  410 +++++
 reftable/refname.c                            |  209 +++
 reftable/refname.h                            |   38 +
 reftable/refname_test.c                       |   99 ++
 reftable/reftable-tests.h                     |   22 +
 reftable/reftable.c                           |  154 ++
 reftable/reftable.h                           |  585 +++++++
 reftable/reftable_test.c                      |  632 ++++++++
 reftable/stack.c                              | 1225 ++++++++++++++
 reftable/stack.h                              |   50 +
 reftable/stack_test.c                         |  787 +++++++++
 reftable/strbuf.c                             |  206 +++
 reftable/strbuf.h                             |   88 +
 reftable/strbuf_test.c                        |   39 +
 reftable/system.h                             |   53 +
 reftable/test_framework.c                     |   69 +
 reftable/test_framework.h                     |   64 +
 reftable/tree.c                               |   63 +
 reftable/tree.h                               |   34 +
 reftable/tree_test.c                          |   62 +
 reftable/update.sh                            |   19 +
 reftable/writer.c                             |  663 ++++++++
 reftable/writer.h                             |   60 +
 reftable/zlib-compat.c                        |   92 ++
 reftable/zlib.BUILD                           |   36 +
 repository.c                                  |    2 +
 repository.h                                  |    3 +
 sequencer.c                                   |   56 +-
 setup.c                                       |   10 +-
 t/helper/test-reftable.c                      |   20 +
 t/helper/test-tool.c                          |    2 +
 t/helper/test-tool.h                          |    2 +
 t/t0031-reftable.sh                           |  185 +++
 t/t0033-debug-refs.sh                         |   18 +
 t/t1400-update-ref.sh                         |   30 +-
 t/t1405-main-ref-store.sh                     |    5 +-
 t/t1409-avoid-packing-refs.sh                 |    6 +
 t/t1450-fsck.sh                               |    6 +
 t/t3210-pack-refs.sh                          |    6 +
 t/test-lib.sh                                 |    5 +
 wt-status.c                                   |    6 +-
 89 files changed, 13076 insertions(+), 256 deletions(-)
 create mode 100644 refs/debug.c
 create mode 100644 refs/reftable-backend.c
 create mode 100644 reftable/.gitattributes
 create mode 100644 reftable/BUILD
 create mode 100644 reftable/LICENSE
 create mode 100644 reftable/README.md
 create mode 100644 reftable/VERSION
 create mode 100644 reftable/WORKSPACE
 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/block_test.c
 create mode 100644 reftable/compat.c
 create mode 100644 reftable/compat.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/merged_test.c
 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/record_test.c
 create mode 100644 reftable/refname.c
 create mode 100644 reftable/refname.h
 create mode 100644 reftable/refname_test.c
 create mode 100644 reftable/reftable-tests.h
 create mode 100644 reftable/reftable.c
 create mode 100644 reftable/reftable.h
 create mode 100644 reftable/reftable_test.c
 create mode 100644 reftable/stack.c
 create mode 100644 reftable/stack.h
 create mode 100644 reftable/stack_test.c
 create mode 100644 reftable/strbuf.c
 create mode 100644 reftable/strbuf.h
 create mode 100644 reftable/strbuf_test.c
 create mode 100644 reftable/system.h
 create mode 100644 reftable/test_framework.c
 create mode 100644 reftable/test_framework.h
 create mode 100644 reftable/tree.c
 create mode 100644 reftable/tree.h
 create mode 100644 reftable/tree_test.c
 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 100644 reftable/zlib.BUILD
 create mode 100644 t/helper/test-reftable.c
 create mode 100755 t/t0031-reftable.sh
 create mode 100755 t/t0033-debug-refs.sh

base-commit: e8ab941b671da6890181aea5b5755d1d9eea24ec

Submitted-As: https://lore.kernel.org/git/pull.539.v20.git.1596209237.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.539.git.1579808479.gitgitgadget@gmail.com
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