Merge branch 'nv/commit-gpgsign-config' into next

Introduce commit.gpgsign configuration variable to force every
commit to be GPG signed.  The variable cannot be overriden from the
command line of some of the commands that create commits except for
"git commit" and "git commit-tree", but I am not convinced that it
is a good idea to sprinkle support for --no-gpg-sign everywhere,
which in turn means that this configuration variable may not be
such a good idea.

* nv/commit-gpgsign-config:
  test the commit.gpgsign config option
  commit-tree: add and document --no-gpg-sign
  commit-tree: add the commit.gpgsign option to sign all commits
Merge branch 'kb/fast-hashmap' into next

Improvements to our hash table to get it to meet the needs of the
msysgit fscache project, with some nice performance improvements.

* kb/fast-hashmap:
  name-hash: retire unused index_name_exists()
  hashmap.h: use 'unsigned int' for hash-codes everywhere
  test-hashmap.c: drop unnecessary #includes
  .gitignore: test-hashmap is a generated file
  read-cache.c: fix memory leaks caused by removed cache entries
  builtin/update-index.c: cleanup update_one
  fix 'git update-index --verbose --again' output
  remove old hash.[ch] implementation
  name-hash.c: remove cache entries instead of marking them CE_UNHASHED
  name-hash.c: use new hash map implementation for cache entries
  name-hash.c: remove unreferenced directory entries
  name-hash.c: use new hash map implementation for directories
  diffcore-rename.c: use new hash map implementation
  diffcore-rename.c: simplify finding exact renames
  diffcore-rename.c: move code around to prepare for the next patch
  buitin/describe.c: use new hash map implementation
  add a hashtable implementation that supports O(1) removal
  submodule: don't access the .gitmodules cache entry after removing it
Merge branch 'da/pull-ff-configuration' into next

"git pull" learned to pay attention to pull.ff configuration
variable.

* da/pull-ff-configuration:
  pull: add --ff-only to the help text
  pull: add pull.ff configuration
Merge branch 'bk/refresh-missing-ok-in-merge-recursive' into next

Allow "merge-recursive" to work in an empty (temporary) working
tree again when there are renames involved, correcting an old
regression in 1.7.7 era.

* bk/refresh-missing-ok-in-merge-recursive:
  merge-recursive.c: tolerate missing files while refreshing index
  read-cache.c: extend make_cache_entry refresh flag with options
  read-cache.c: refactor --ignore-missing implementation
  t3030-merge-recursive: test known breakage with empty work tree
Merge branch 'nd/submodule-pathspec-ending-with-slash' into next

Allow "git cmd path/", when the 'path' is where a submodule is
bound to the top-level working tree, to match 'path', despite the
extra and unnecessary trailing slash.

* nd/submodule-pathspec-ending-with-slash:
  clean: use cache_name_is_other()
  clean: replace match_pathspec() with dir_path_match()
  pathspec: pass directory indicator to match_pathspec_item()
  match_pathspec: match pathspec "foo/" against directory "foo"
  dir.c: prepare match_pathspec_item for taking more flags
  pathspec: rename match_pathspec_depth() to match_pathspec()
  pathspec: convert some match_pathspec_depth() to dir_path_match()
  pathspec: convert some match_pathspec_depth() to ce_path_match()
Merge branch 'nd/diff-quiet-stat-dirty' into next

"git diff --quiet -- pathspec1 pathspec2" sometimes did not return
correct status value.

* nd/diff-quiet-stat-dirty:
  diff: do not quit early on stat-dirty files
  diff.c: move diffcore_skip_stat_unmatch core logic out for reuse later
Merge branch 'ds/rev-parse-required-args' into next

"git rev-parse --default" without the required option argument did
not diagnose it as an error.

* ds/rev-parse-required-args:
  rev-parse: check i before using argv[i] against argc
Merge branch 'jk/config-path-include-fix' into next

include.path variable (or any variable that expects a path that can
use ~username expansion) in the configuration file is not a
boolean, but the code failed to check it.

* jk/config-path-include-fix:
  handle_path_include: don't look at NULL value
  expand_user_path: do not look at NULL path
Merge branch 'bs/stdio-undef-before-redef' into next

When we replace broken macros from stdio.h in git-compat-util.h,
preprocessor.

* bs/stdio-undef-before-redef:
  git-compat-util.h: #undef (v)snprintf before #define them
Merge branch 'ep/varscope' into next

Shrink lifetime of variables by moving their definitions to an
inner scope where appropriate.

* ep/varscope:
  builtin/gc.c: reduce scope of variables
  builtin/fetch.c: reduce scope of variable
  builtin/commit.c: reduce scope of variables
  builtin/clean.c: reduce scope of variable
  builtin/blame.c: reduce scope of variables
  builtin/apply.c: reduce scope of variables
  bisect.c: reduce scope of variable
Merge branch 'wk/submodule-on-branch' into next

Make sure 'submodule update' modes that do not detach HEADs can
be used more pleasantly by checking out a concrete branch when
cloning them to prime the well.

* wk/submodule-on-branch:
  Documentation: describe 'submodule update --remote' use case
  submodule: explicit local branch creation in module_clone
  submodule: document module_clone arguments in comments
  submodule: make 'checkout' update_module mode more explicit
Merge branch 'nd/test-rename-reset' into next

* nd/test-rename-reset:
  t7101, t7014: rename test files to indicate what that file is for
Merge branch 'mw/symlinks' into next

All subcommands that take pathspecs mishandled an in-tree symbolic
link when given it as a full path from the root (which arguably is
a sick way to use pathspecs).  "git ls-files -s $(pwd)/RelNotes" in
our tree is an easy reproduction recipe.

* mw/symlinks:
  setup: don't dereference in-tree symlinks for absolute paths
  setup: add abspath_part_inside_repo() function
  t0060: add tests for prefix_path when path begins with work tree
  t0060: add test for prefix_path when path == work tree
  t0060: add test for prefix_path on symlinks via absolute paths
  t3004: add test for ls-files on symlinks via absolute paths
Merge branch 'ks/tree-diff-walk' into next

* ks/tree-diff-walk:
  tree-walk: finally switch over tree descriptors to contain a pre-parsed entry
  revision: convert to using diff_tree_sha1()
  line-log: convert to using diff_tree_sha1()
  tree-diff: convert diff_root_tree_sha1() to just call diff_tree_sha1 with old=NULL
  tree-diff: allow diff_tree_sha1 to accept NULL sha1
Merge branch 'nd/reset-intent-to-add' into next

* nd/reset-intent-to-add:
  reset: support "--mixed --intent-to-add" mode
Merge branch 'jk/test-ports' into next

Avoid having to assign port number to be used in tests manually.

* jk/test-ports:
  tests: auto-set git-daemon port
  tests: auto-set LIB_HTTPD_PORT from test name
Merge branch 'al/docs' into next

A handful of documentation updates, all trivially harmless.

* al/docs:
  docs/git-blame: explain more clearly the example pickaxe use
  docs/git-clone: clarify use of --no-hardlinks option
  docs/git-remote: capitalize first word of initial blurb
  docs/merge-strategies: remove hyphen from mis-merges
Merge branch 'bc/gpg-sign-everywhere' into next

Teach "--gpg-sign" option to many commands that create commits.

* bc/gpg-sign-everywhere:
  pull: add the --gpg-sign option.
  rebase: add the --gpg-sign option
  rebase: parse options in stuck-long mode
  rebase: don't try to match -M option
  rebase: remove useless arguments check
  am: add the --gpg-sign option
  am: parse options in stuck-long mode
  git-sh-setup.sh: add variable to use the stuck-long mode
  cherry-pick, revert: add the --gpg-sign option
Merge branch 'dk/blame-janitorial' into next

Code clean-up.

* dk/blame-janitorial:
  builtin/blame.c::find_copy_in_blob: no need to scan for region end
  blame.c: prepare_lines should not call xrealloc for every line
  builtin/blame.c::prepare_lines: fix allocation size of sb->lineno
  builtin/blame.c: eliminate same_suspect()
  builtin/blame.c: struct blame_entry does not need a prev link
Merge branch 'jk/pack-bitmap' into next

Borrow the bitmap index into packfiles from JGit to speed up
enumeration of objects involved in a commit range without having to
fully traverse the history.

* jk/pack-bitmap: (26 commits)
  ewah: unconditionally ntohll ewah data
  ewah: support platforms that require aligned reads
  read-cache: use get_be32 instead of hand-rolled ntoh_l
  block-sha1: factor out get_be and put_be wrappers
  do not discard revindex when re-preparing packfiles
  pack-bitmap: implement optional name_hash cache
  t/perf: add tests for pack bitmaps
  t: add basic bitmap functionality tests
  count-objects: recognize .bitmap in garbage-checking
  repack: consider bitmaps when performing repacks
  repack: handle optional files created by pack-objects
  repack: turn exts array into array-of-struct
  repack: stop using magic number for ARRAY_SIZE(exts)
  pack-objects: implement bitmap writing
  rev-list: add bitmap mode to speed up object lists
  pack-objects: use bitmaps when packing objects
  pack-objects: split add_object_entry
  pack-bitmap: add support for bitmap indexes
  documentation: add documentation for the bitmap format
  ewah: compressed bitmap implementation
  ...