Thanks to Andreas Schwab for careful reading.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

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

Recent "git am" had regression when adding a Signed-off-by line
with its "-s" option by an unintended tightening of how an existing
trailer block is detected.

* jc/builtin-am-signoff-regression-fix:
  am: match --signoff to the original scripted version

Linus noticed that the recently reimplemented "git am -s" defines
the trailer block too rigidly, resulting in an unnecessary blank
line between the existing sign-offs and his new sign-off.  An e-mail
submission sent to Linus in real life ends with mixture of sign-offs
and commentaries, e.g.

	title here

	message here
Signed-off-by: NOriginal Author <original@auth.or>
	[rv: tweaked frotz and nitfol]
Signed-off-by: NRe Viewer <rv@ew.er>
Signed-off-by: NOther Reviewer <other@rev.ewer>
	---
	patch here

Because the reimplementation reused append_signoff() helper that is
used by other codepaths, which is unaware that people intermix such
comments with their sign-offs in the trailer block, such a message
was judged to end with a non-trailer, resulting in an extra blank
line before adding a new sign-off.

The original scripted version of "git am" used a lot looser
definition, i.e. "if and only if there is no line that begins with
Signed-off-by:, add a blank line before adding a new sign-off".  For
the upcoming release, stop using the append_signoff() in "git am"
and reimplement the looser definition used by the scripted version
to use only in "git am" to fix this regression in "am" while
avoiding new regressions to other users of append_signoff().

In the longer term, we should look into loosening append_signoff()
so that other codepaths that add a new sign-off behave the same way
as "git am -s", but that is a task for post-release.
Reported-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

* maint:

* ee/clean-test-fixes:
  t7300: fix broken && chains

"git init empty && git -C empty log" said "bad default revision 'HEAD'",
which was found to be a bit confusing to new users.

* jk/log-missing-default-HEAD:
  log: diagnose empty HEAD more clearly

The "interpret-trailers" helper mistook a multi-paragraph title of
a commit log message with a colon in it as the end of the trailer
block.

* cc/trailers-corner-case-fix:
  trailer: support multiline title
  trailer: retitle a test and correct an in-comment message
  trailer: ignore first line of message

When re-priming the cache-tree opportunistically while committing
the in-core index as-is, we mistakenly invalidated the in-core
index too aggressively, causing the experimental split-index code
to unnecessarily rewrite the on-disk index file(s).

* dt/commit-preserve-base-index-upon-opportunistic-cache-tree-update:
  commit: don't rewrite shared index unnecessarily

"git archive" did not use zip64 extension when creating an archive
with more than 64k entries, which nobody should need, right ;-)?

* rs/archive-zip-many:
  archive-zip: support more than 65535 entries
  archive-zip: use a local variable to store the creator version
  t5004: test ZIP archives with many entries

Minor code cleanup.

* jc/calloc-pathspec:
  ps_matched: xcalloc() takes nmemb and then element size

* ss/fix-config-fd-leak:
  config: close config file handle in case of error

* sg/wt-status-header-inclusion:
  wt-status: move #include "pathspec.h" to the header

Doc updates for i18n.

* po/po-readme:
  po/README: Update directions for l10n contributors

* sg/t3020-typofix:
  t3020: fix typo in test description

Docfix.

* as/docfix-reflog-expire-unreachable:
  Documentation/config: fix inconsistent label on gc.*.reflogExpireUnreachable

The code in "multiple-worktree" support that attempted to recover
from an inconsistent state updated an incorrect file.

* nd/fixup-linked-gitdir:
  setup: update the right file in multiple checkouts

"git rev-list" does not take "--notes" option, but did not complain
when one is given.

* jk/rev-list-has-no-notes:
  rev-list: make it obvious that we do not support notes

Because the configuration system does not allow "alias.0foo" and
"pager.0foo" as the configuration key, the user cannot use '0foo'
as a custom command name anyway, but "git 0foo" tried to look these
keys up and emitted useless warnings before saying '0foo is not a
git command'.  These warning messages have been squelched.

* jk/fix-alias-pager-config-key-warnings:
  config: silence warnings for command names with invalid keys

Test updates for Windows.

* nd/dwim-wildcards-as-pathspecs:
  t2019: skip test requiring '*' in a file name non Windows

We rewrote one of the build scripts in Perl but this reimplements
in Bourne shell.

* sg/help-group:
  generate-cmdlist: re-implement as shell script

t1509 test that requires a dedicated VM environment had some
bitrot, which has been corrected.

* ps/t1509-chroot-test-fixup:
  tests: fix cleanup after tests in t1509-root-worktree
  tests: fix broken && chains in t1509-root-worktree

strbuf_read() used to have one extra iteration (and an unnecessary
strbuf_grow() of 8kB), which was eliminated.

* jh/strbuf-read-use-read-in-full:
  strbuf_read(): skip unnecessary strbuf_grow() at eof

The codepath to produce error messages had a hard-coded limit to
the size of the message, primarily to avoid memory allocation while
calling die().

* jk/long-error-messages:
  vreportf: avoid intermediate buffer
  vreportf: report to arbitrary filehandles

When trying to see that an object does not exist, a state errno
leaked from our "first try to open a packfile with O_NOATIME and
then if it fails retry without it" logic on a system that refuses
O_NOATIME.  This confused us and caused us to die, saying that the
packfile is unreadable, when we should have just reported that the
object does not exist in that packfile to the caller.

* cb/open-noatime-clear-errno:
  git_open_noatime: return with errno=0 on success

An off-by-one error made "git remote" to mishandle a remote with a
single letter nickname.

* mh/get-remote-group-fix:
  get_remote_group(): use skip_prefix()
  get_remote_group(): eliminate superfluous call to strcspn()
  get_remote_group(): rename local variable "space" to "wordlen"
  get_remote_group(): handle remotes with single-character names

Recent "git am" introduced a double-locking failure when used with
the "--3way" option that invokes rerere machinery.

* jk/am-rerere-lock-fix:
  rerere: release lockfile in non-writing functions

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

The "interpret-trailers" helper mistook a multi-paragraph title of
a commit log message with a colon in it as the end of the trailer
block.

* cc/trailers-corner-case-fix:
  trailer: support multiline title

* sb/read-cache-one-indent-style-fix:
  read-cache: fix indentation in read_index_from

* ee/clean-test-fixes:
  t7300: fix broken && chains

"git init empty && git -C empty log" said "bad default revision 'HEAD'",
which was found to be a bit confusing to new users.

* jk/log-missing-default-HEAD:
  log: diagnose empty HEAD more clearly

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

When re-priming the cache-tree opportunistically while committing
the in-core index as-is, we mistakenly invalidated the in-core
index too aggressively, causing the experimental split-index code
to unnecessarily rewrite the on-disk index file(s).

* dt/commit-preserve-base-index-upon-opportunistic-cache-tree-update:
  commit: don't rewrite shared index unnecessarily

* rt/remove-hold-lockfile-for-append:
  lockfile: remove function "hold_lock_file_for_append"

"git archive" did not use zip64 extension when creating an archive
with more than 64k entries, which nobody should need, right ;-)?

* rs/archive-zip-many:
  archive-zip: support more than 65535 entries
  archive-zip: use a local variable to store the creator version
  t5004: test ZIP archives with many entries

On case insensitive systems, "git p4" did not work well with client
specs.

* ls/p4-fold-case-client-specs:
  git-p4: honor core.ignorecase when using P4 client specs

Error string fix.

* ah/submodule-typofix-in-error:
  git-submodule: remove extraneous space from error message

Error string fix.

* ah/reflog-typofix-in-error:
  reflog: add missing single quote to error message

Usage string fix.

* ah/read-tree-usage-string:
  read-tree: replace bracket set with parentheses to clarify usage