[GSoC Patch v3 0/7] repo: add more path keys to git repo info

Series adds keys to git repo info.
Keys output paths of repository components:
* path.toplevel: repository tree.
* path.superproject-working-tree: superproject tree from submodules.
* path.objects: repository objects.
* path.hooks: repository hooks.
* path.index: repository index.
* path.grafts: repository grafts.
* path.git-prefix: prefix offset.

Keys support suffixes for format. Commits contain documentation and tests.

Changes since v2:
* path.index: no functional change; documented that the returned path
  reflects the default/configured index location even in a bare
  repository or when the file doesn't exist yet, and added a test
  covering path.index inside a bare repository.
* path.grafts: no functional change; documented that the path is
  returned even if the grafts file doesn't currently exist on disk.
* path.git-prefix: no change since v2 (already addressed the stray
  include and misleading "validation" in the subject).

K Jayatheerth (7):
  repo: add path.toplevel with absolute and relative suffix formatting
  repo: add path.superproject-working-tree with absolute and relative
    suffixes
  repo: add path.objects with absolute and relative suffix formatting
  repo: add path.hooks with absolute and relative suffix formatting
  repo: add path.index with absolute and relative suffix formatting
  repo: add path.grafts with absolute and relative suffix formatting
  repo: add path.git-prefix path key

 Documentation/git-repo.adoc |  64 ++++++++++++++
 builtin/repo.c              | 166 ++++++++++++++++++++++++++++++++++++
 t/t1900-repo-info.sh        | 125 +++++++++++++++++++++++++++
 3 files changed, 355 insertions(+)

Range-diff against v2:
1:  297d625ea1 = 1:  297d625ea1 repo: add path.toplevel with absolute and relative suffix formatting
2:  8a84aaa2a1 = 2:  8a84aaa2a1 repo: add path.superproject-working-tree with absolute and relative suffixes
3:  159166ce85 = 3:  159166ce85 repo: add path.objects with absolute and relative suffix formatting
4:  ff5e382043 = 4:  ff5e382043 repo: add path.hooks with absolute and relative suffix formatting
5:  d906735e3d ! 5:  917d3a5076 repo: add path.index with absolute and relative suffix formatting
    @@ Documentation/git-repo.adoc: values that they return:
      
     +`path.index.absolute`::
     +	The canonical absolute path to the repository's current index file.
    -+	Respects the `GIT_INDEX_FILE` environment override.
    ++	Respects the `GIT_INDEX_FILE` environment override. The returned path
    ++	reflects the configured/default index location regardless of whether the
    ++	repository is bare or whether the file currently exists.
     +
     +`path.index.relative`::
     +	The path to the repository's current index file relative to the current
     +	working directory. Respects the `GIT_INDEX_FILE` environment override.
    ++	The returned path reflects the configured/default index location regardless
    ++	of whether the repository is bare or whether the file currently exists.
     +
      `path.objects.absolute`::
      	The canonical absolute path to the repository's object database directory.
    @@ t/t1900-repo-info.sh: test_repo_info_path 'hooks with core.hooksPath override' '
     +test_repo_info_path 'index with GIT_INDEX_FILE override' 'index' \
     +	'custom-index-file' \
     +	'GIT_INDEX_FILE="$ROOT/custom-index-file" && export GIT_INDEX_FILE'
    ++
    ++test_expect_success 'path.index in a bare repository returns default index location' '
    ++	test_when_finished "rm -rf bare.git" &&
    ++	git init --bare bare.git &&
    ++	(
    ++		cd bare.git &&
    ++		ROOT="$(test-tool path-utils real_path .)" &&
    ++
    ++		echo "path.index.absolute=$ROOT/index" >expect.abs &&
    ++		git repo info path.index.absolute >actual.abs &&
    ++		test_cmp expect.abs actual.abs &&
    ++
    ++		echo "path.index.relative=index" >expect.rel &&
    ++		git repo info path.index.relative >actual.rel &&
    ++		test_cmp expect.rel actual.rel
    ++	)
    ++'
     +
      test_repo_info_path 'objects standard' 'objects' '.git/objects'
      
6:  2d21f9536c ! 6:  d47a5701d5 repo: add path.grafts with absolute and relative suffix formatting
    @@ Documentation/git-repo.adoc: values that they return:
      
     +`path.grafts.absolute`::
     +	The canonical absolute path to the repository grafts file.
    -+	Respects the `GIT_GRAFT_FILE` environment override.
    ++	Respects the `GIT_GRAFT_FILE` environment override. The path is returned
    ++	regardless of whether the file currently exists on disk.
     +
     +`path.grafts.relative`::
     +	The path to the repository grafts file relative to the current working
    -+	directory. Respects the `GIT_GRAFT_FILE` environment override.
    ++	directory. Respects the `GIT_GRAFT_FILE` environment override. The path
    ++	is returned regardless of whether the file currently exists on disk.
     +
      `path.hooks.absolute`::
      	The canonical absolute path to the repository's hooks directory.
7:  1dbe191176 = 7:  fd90b0b3b5 repo: add path.git-prefix path key