Doc update.

* ks/doc-use-camelcase-for-config-name:
  doc: camelCase the config variables to improve readability

The delta format used in the packfile cannot reference data at
offset larger than what can be expressed in 4-byte, but the
generator for the data failed to make sure the offset does not
overflow.  This has been corrected.

* mk/diff-delta-avoid-large-offset:
  diff-delta: do not allow delta offset truncation

The machinery to create xdelta used in pack files received the
sizes of the data in size_t, but lost the higher bits of them by
storing them in "unsigned int" during the computation, which is
fixed.

* mk/diff-delta-uint-may-be-shorter-than-ulong:
  diff-delta: fix encoding size that would not fit in "unsigned int"

Code clean-up.

* rs/resolve-ref-optional-result:
  refs: pass NULL to resolve_ref_unsafe() if hash is not needed
  refs: pass NULL to refs_resolve_ref_unsafe() if hash is not needed
  refs: make sha1 output parameter of refs_resolve_ref_unsafe() optional

"git mailinfo" was loose in decoding quoted printable and produced
garbage when the two letters after the equal sign are not
hexadecimal.  This has been fixed.

* rs/mailinfo-qp-decode-fix:
  mailinfo: don't decode invalid =XY quoted-printable sequences

A docfix.

* jk/doc-read-tree-table-asciidoctor-fix:
  doc: put literal block delimiter around table

The built-in pattern to detect the "function header" for HTML did
not match <H1>..<H6> elements without any attributes, which has
been fixed.

* ik/userdiff-html-h-element-fix:
  userdiff: fix HTML hunk header regexp

Many codepaths have been updated to squelch -Wimplicit-fallthrough
warnings from Gcc 7 (which is a good code hygiene).

* jk/fallthrough:
  consistently use "fallthrough" comments in switches
  curl_trace(): eliminate switch fallthrough
  test-line-buffer: simplify command parsing

"git cat-file --textconv" started segfaulting recently, which
has been corrected.

* jk/diff-blob:
  cat-file: handle NULL object_context.path

* hn/typofix:
  submodule.h: typofix

"git filter-branch" cannot reproduce a history with a tag without
the tagger field, which only ancient versions of Git allowed to be
created.  This has been corrected.

* ic/fix-filter-branch-to-handle-tag-without-tagger:
  filter-branch: use hash-object instead of mktag
  filter-branch: stash away ref map in a branch
  filter-branch: preserve and restore $GIT_AUTHOR_* and $GIT_COMMITTER_*
  filter-branch: reset $GIT_* before cleaning up

"git describe --match" learned to take multiple patterns in v2.13
series, but the feature ignored the patterns after the first one
and did not work at all.  This has been fixed.

* jk/describe-omit-some-refs:
  describe: fix matching to actually match all patterns

* maint:
  Git 2.14.2
  Git 2.13.6
  Git 2.12.5
  Git 2.11.4
  Git 2.10.5
  cvsimport: shell-quote variable used in backticks
  archimport: use safe_pipe_capture for user input
  shell: drop git-cvsserver support by default
  cvsserver: use safe_pipe_capture for `constant commands` as well
  cvsserver: use safe_pipe_capture instead of backticks
  cvsserver: move safe_pipe_capture() to the main package

References to multi-word configuration variable names in our
documentation must consistently use camelCase to highlight where
the word boundaries are, even though these are treated case
insensitively.

Fix a few places that spell them in all lowercase, which makes
them harder to read.
Signed-off-by: NKaartic Sivaraam <kaarticsivaraam91196@gmail.com>
Reviewed-by: NJonathan Nieder <jrnieder@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

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

Doc updates.

* ks/test-readme-phrasofix:
  t/README: fix typo and grammatically improve a sentence

"git rev-parse" learned "--is-shallow-repository", that is to be
used in a way similar to existing "--is-bare-repository" and
friends.

* ow/rev-parse-is-shallow-repo:
  rev-parse: rev-parse: add --is-shallow-repository

On Cygwin, "ulimit -s" does not report failure but it does not work
at all, which causes an unexpected success of some tests that
expect failures under a limited stack situation.  This has been
fixed.

* rj/test-ulimit-on-windows:
  t9010-*.sh: skip all tests if the PIPE prereq is missing
  test-lib: use more compact expression in PIPE prerequisite
  test-lib: don't use ulimit in test prerequisites on cygwin

A regression fix for 2.11 that made the code to read the list of
alternate object stores overrun the end of the string.

* jk/info-alternates-fix:
  read_info_alternates: warn on non-trivial errors
  read_info_alternates: read contents into strbuf

Code cmp.std.c nitpick.

* mh/for-each-string-list-item-empty-fix:
  for_each_string_list_item: avoid undefined behavior for empty list

The test linter has been taught that we do not like "echo -e".

* tb/test-lint-echo-e:
  test-lint: echo -e (or -E) is not portable

Code clean-up that also plugs memory leaks.

* jk/revision-remove-cmdline-pathspec:
  pathspec doc: parse_pathspec does not maintain references to args
  revision: replace "struct cmdline_pathspec" with argv_array

The scripts to drive TravisCI has been reorganized and then an
optimization to avoid spending cycles on a branch whose tip is
tagged has been implemented.

* ls/travis-scriptify:
  travis-ci: fix "skip_branch_tip_with_tag()" string comparison
  travis: dedent a few scripts that are indented overly deeply
  travis-ci: skip a branch build if equal tag is present
  travis-ci: move Travis CI code into dedicated scripts

"git gc" tries to avoid running two instances at the same time by
reading and writing pid/host from and to a lock file; it used to
use an incorrect fscanf() format when reading, which has been
corrected.

* aw/gc-lockfile-fscanf-fix:
  gc: call fscanf() with %<len>s, not %<len>c, when reading hostname

A test to demonstrate "git mv" failing to adjust nested submodules
has been added.

* hv/mv-nested-submodules-test:
  add test for bug in git-mv for recursive submodules

"make style" runs git-clang-format to help developers by pointing
out coding style issues.

* bw/git-clang-format:
  Makefile: add style build rule
  clang-format: outline the git project's coding style

"git imap-send" has our own implementation of the protocol and also
can use more recent libCurl with the imap protocol support.  Update
the latter so that it can use the credential subsystem, and then
make it the default option to use, so that we can eventually
deprecate and remove the former.

* nm/imap-send-with-curl:
  imap-send: use curl by default when possible
  imap_send: setup_curl: retreive credentials if not set in config file
  imap-send: add wrapper to get server credentials if needed
  imap-send: return with error if curl failed

The explanation of the cut-line in the commit log editor has been
slightly tweaked.

* ks/commit-do-not-touch-cut-line:
  commit-template: change a message to be more intuitive

API error-proofing which happens to also squelch warnings from GCC.

* tg/refs-allowed-flags:
  refs: strip out not allowed flags from ref_transaction_update

"git archive", especially when used with pathspec, stored an empty
directory in its output, even though Git itself never does so.
This has been fixed.

* rs/archive-excluded-directory:
  archive: don't add empty directories to archives

"git help co" now says "co is aliased to ...", not "git co is".

* ks/help-alias-label:
  help: change a message to be more precise

Step #0 of a planned & larger series to make the in-core object
store per in-core repository object.

* jn/per-repo-object-store-fixes:
  replace-objects: evaluate replacement refs without using the object store
  push, fetch: error out for submodule entries not pointing to commits
  pack: make packed_git_mru global a value instead of a pointer

Many codepaths did not diagnose write failures correctly when disks
go full, due to their misuse of write_in_full() helper function,
which have been corrected.

* jk/write-in-full-fix:
  read_pack_header: handle signed/unsigned comparison in read result
  config: flip return value of store_write_*()
  notes-merge: use ssize_t for write_in_full() return value
  pkt-line: check write_in_full() errors against "< 0"
  convert less-trivial versions of "write_in_full() != len"
  avoid "write_in_full(fd, buf, len) != len" pattern
  get-tar-commit-id: check write_in_full() return against 0
  config: avoid "write_in_full(fd, buf, len) < len" pattern

Typofix.

* ez/doc-duplicated-words-fix:
  doc: fix minor typos (extra/duplicated words)

Doc update.

* kd/doc-for-each-ref:
  doc/for-each-ref: explicitly specify option names
  doc/for-each-ref: consistently use '=' to between argument names and values

Finishing touches to a topic already in 'master'.

* cc/subprocess-handshake-missing-capabilities:
  subprocess: loudly die when subprocess asks for an unsupported capability

A hotfix to a topic already in 'master'.

* kw/write-index-reduce-alloc:
  read-cache: fix index corruption with index v4
  Add t/helper/test-write-cache to .gitignore

A handful of tests to demonstrates a recursive implementation of
"name-rev" hurts.

* mg/name-rev-tests-with-short-stack:
  t6120: test describe and name-rev with deep repos
  t6120: clean up state after breaking repo
  t6120: test name-rev --all and --stdin
  t7004: move limited stack prereq to test-lib

Decode =XY in quoted-printable segments only if X and Y are hexadecimal
digits, otherwise just copy them.  That's at least better than
interpreting negative results from hexval() as a character.
Reported-by: NJeff King <peff@peff.net>
Signed-off-by: NRene Scharfe <l.s.r@web.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

This allows us to get rid of some write-only variables, among them seven
SHA1 buffers.
Signed-off-by: NRene Scharfe <l.s.r@web.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>