Updates to the HTTP layer we made recently unconditionally used
features of libCurl without checking the existence of them, causing
compilation errors, which has been fixed.  Also migrate the code to
check feature macros, not version numbers, to cope better with
libCurl that vendor ships with backported features.

* tc/curl-with-backports:
  http: use a feature check to enable GSSAPI delegation control
  http: fix handling of missing CURLPROTO_*

When handshake with a subprocess filter notices that the process
asked for an unknown capability, Git did not report what program
the offending subprocess was running.  This has been corrected.

* cc/subprocess-handshake-missing-capabilities:
  sub-process: print the cmd when a capability is unsupported

Conversion from uchar[20] to struct object_id continues.

* rs/object-id:
  tree-walk: convert fill_tree_descriptor() to object_id

"git merge" learned a "--signoff" option to add the Signed-off-by:
trailer with the committer's name.

* lg/merge-signoff:
  merge: add a --signoff flag

* maint:
  Prepare for 2.14.2

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

A test update.

* jt/t1450-fsck-corrupt-packfile:
  tests: ensure fsck fails on corrupt packfiles

Code clean-up.

* jb/t8008-cleanup:
  t8008: rely on rev-parse'd HEAD instead of sha1 value

Code cleanup.

* jt/subprocess-handshake:
  sub-process: refactor handshake to common function
  Documentation: migrate sub-process docs to header
  convert: add "status=delayed" to filter process protocol
  convert: refactor capabilities negotiation
  convert: move multiple file filter error handling to separate function
  convert: put the flags field before the flag itself for consistent style
  t0021: write "OUT <size>" only on success
  t0021: make debug log file name configurable
  t0021: keep filter log files on comparison

Code cleanup.

* dc/fmt-merge-msg-microcleanup:
  fmt-merge-msg: fix coding style

Doc update.

* ah/doc-wserrorhighlight:
  doc: add missing values "none" and "default" for diff.wsErrorHighlight

Code cleanup.

* cc/ref-is-hidden-microcleanup:
  refs: use skip_prefix() in ref_is_hidden()

API fix.

* js/run-process-parallel-api-fix:
  run_processes_parallel: change confusing task_cb convention

Code clean-up.

* rs/pack-objects-pbase-cleanup:
  pack-objects: remove unnecessary NULL check

Code clean-up.

* jt/fsck-code-cleanup:
  fsck: cleanup unused variable
  object: remove "used" field from struct object
  fsck: remove redundant parse_tree() invocation

Code clean-up.

* rs/stat-data-unaligned-reads-fix:
  dir: support platforms that require aligned reads

Code clean-up.

* rs/move-array:
  ls-files: don't try to prune an empty index
  apply: use COPY_ARRAY and MOVE_ARRAY in update_image()
  use MOVE_ARRAY
  add MOVE_ARRAY

Code clean-up.

* rs/bswap-ubsan-fix:
  bswap: convert get_be16, get_be32 and put_be32 to inline functions
  bswap: convert to unsigned before shifting in get_be32

A recently added test for the "credential-cache" helper revealed
that EOF detection done around the time the connection to the cache
daemon is torn down were flaky.  This was fixed by reacting to
ECONNRESET and behaving as if we got an EOF.

* dl/credential-cache-socket-in-xdg-cache:
  credential-cache: interpret an ECONNRESET as an EOF

When a directory is not readable, "gitweb" fails to build the
project list.  Work this around by skipping such a directory.

It might end up hiding a problem under the rug and a better
solution might be to loudly complain to the administrator pointing
out the problematic directory, but this will at least make it
"work".

* hb/gitweb-project-list:
  gitweb: skip unreadable subdirectories

"git commit" when seeing an totally empty message said "you did not
edit the message", which is clearly wrong.  The message has been
corrected.

* ks/commit-abort-on-empty-message-fix:
  commit: check for empty message before the check for untouched template

Numerous bugs in walking of reflogs via "log -g" and friends have
been fixed.

* jk/reflog-walk:
  reflog-walk: apply --since/--until to reflog dates
  reflog-walk: stop using fake parents
  rev-list: check reflog_info before showing usage
  get_revision_1(): replace do-while with an early return
  log: do not free parents when walking reflog
  log: clarify comment about reflog cycles
  revision: disallow reflog walking with revs->limited
  t1414: document some reflog-walk oddities

The http.{sslkey,sslCert} configuration variables are to be
interpreted as a pathname that honors "~[username]/" prefix, but
weren't, which has been fixed.

* jc/http-sslkey-and-ssl-cert-are-paths:
  http.c: http.sslcert and http.sslkey are both pathnames

"%C(color name)" in the pretty print format always produced ANSI
color escape codes, which was an early design mistake.  They now
honor the configuration (e.g. "color.ui = never") and also tty-ness
of the output medium.

* jk/ref-filter-colors:
  ref-filter: consult want_color() before emitting colors
  pretty: respect color settings for %C placeholders
  rev-list: pass diffopt->use_colors through to pretty-print
  for-each-ref: load config earlier
  color: check color.ui in git_default_config()
  ref-filter: pass ref_format struct to atom parsers
  ref-filter: factor out the parsing of sorting atoms
  ref-filter: make parse_ref_filter_atom a private function
  ref-filter: provide a function for parsing sort options
  ref-filter: move need_color_reset_at_eol into ref_format
  ref-filter: abstract ref format into its own struct
  ref-filter: simplify automatic color reset
  t: use test_decode_color rather than literal ANSI codes
  docs/for-each-ref: update pointer to color syntax
  check return value of verify_ref_format()

Because recent Git for Windows do come with a real msgfmt, the
build procedure for git-gui has been updated to use it instead of a
hand-rolled substitute.

* js/git-gui-msgfmt-on-windows:
  git-gui (MinGW): make use of MSys2's msgfmt
  git gui: allow for a long recentrepo list
  git gui: de-dup selected repo from recentrepo history
  git gui: cope with duplicates in _get_recentrepo
  git-gui: remove duplicate entries from .gitconfig's gui.recentrepo

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Doc fix.

* mg/format-ref-doc-fix:
  Documentation/git-for-each-ref: clarify peeling of tags for --format
  Documentation: use proper wording for ref format strings

Code clean-up.

* sb/submodule-parallel-update:
  submodule.sh: remove unused variable

Code clean-up.

* jc/diff-sane-truncate-no-more:
  diff: retire sane_truncate_fn

Test fix.

* hv/t5526-andand-chain-fix:
  t5526: fix some broken && chains

"git grep -L" and "git grep --quiet -L" reported different exit
codes; this has been corrected.

* as/grep-quiet-no-match-exit-code-fix:
  git-grep: correct exit code with --quiet and -L

"git commit" used to discard the index and re-read from the filesystem
just in case the pre-commit hook has updated it in the middle; this
has been optimized out when we know we do not run the pre-commit hook.

* kw/commit-keep-index-when-pre-commit-is-not-run:
  commit: skip discarding the index if there is no pre-commit hook

Code clean-up.

* sb/sha1-file-cleanup:
  sha1_file: make read_info_alternates static

Test simplification.

* rs/t1002-do-not-use-sum:
  t1002: stop using sum(1)

bash 4.4 or newer gave a warning on NUL byte in command
substitution done in "git stash"; this has been squelched.

* kd/stash-with-bash-4.4:
  stash: prevent warning about null bytes in input

Doc update.

* ah/doc-empty-string-is-false:
  doc: clarify "config --bool" behaviour with empty string

"git rebase", especially when it is run by mistake and ends up
trying to replay many changes, spent long time in silence.  The
command has been taught to show progress report when it spends
long time preparing these many changes to replay (which would give
the user a chance to abort with ^C).

* kw/rebase-progress:
  rebase: turn on progress option by default for format-patch
  format-patch: have progress option while generating patches

An "oops" fix to a topic that is already in 'master'.

* ks/prepare-commit-msg-sample-fix:
  hook: use correct logical variable

"git stash -u" used the contents of the committed version of the
".gitignore" file to decide which paths are ignored, even when the
file has local changes.  The command has been taught to instead use
the locally modified contents.

* nm/stash-untracked:
  stash: clean untracked files before reset

Preparatory code clean-up.

* jt/sha1-file-cleanup:
  sha1_file: remove read_packed_sha1()
  sha1_file: set whence in storage-specific info fn