merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

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+git-log(1)
+==========
+
+NAME
+----
+git-log - Show commit logs
+
+
+SYNOPSIS
+--------
+[verse]
+'git log' [<options>] [<revision range>] [[--] <path>...]
+
+DESCRIPTION
+-----------
+Shows the commit logs.
+
+The command takes options applicable to the `git rev-list`
+command to control what is shown and how, and options applicable to
+the `git diff-*` commands to control how the changes
+each commit introduces are shown.
+
+
+OPTIONS
+-------
+
+--follow::
+	Continue listing the history of a file beyond renames
+	(works only for a single file).
+
+--no-decorate::
+--decorate[=short|full|auto|no]::
+	Print out the ref names of any commits that are shown. If 'short' is
+	specified, the ref name prefixes 'refs/heads/', 'refs/tags/' and
+	'refs/remotes/' will not be printed. If 'full' is specified, the
+	full ref name (including prefix) will be printed. If 'auto' is
+	specified, then if the output is going to a terminal, the ref names
+	are shown as if 'short' were given, otherwise no ref names are
+	shown. The default option is 'short'.
+
+--decorate-refs=<pattern>::
+--decorate-refs-exclude=<pattern>::
+	If no `--decorate-refs` is given, pretend as if all refs were
+	included.  For each candidate, do not use it for decoration if it
+	matches any patterns given to `--decorate-refs-exclude` or if it
+	doesn't match any of the patterns given to `--decorate-refs`.
+
+--source::
+	Print out the ref name given on the command line by which each
+	commit was reached.
+
+--[no-]use-mailmap::
+	Use mailmap file to map author and committer names and email
+	addresses to canonical real names and email addresses. See
+	linkgit:git-shortlog[1].
+
+--full-diff::
+	Without this flag, `git log -p <path>...` shows commits that
+	touch the specified paths, and diffs about the same specified
+	paths.  With this, the full diff is shown for commits that touch
+	the specified paths; this means that "<path>..." limits only
+	commits, and doesn't limit diff for those commits.
++
+Note that this affects all diff-based output types, e.g. those
+produced by `--stat`, etc.
+
+--log-size::
+	Include a line ``log size <number>'' in the output for each commit,
+	where <number> is the length of that commit's message in bytes.
+	Intended to speed up tools that read log messages from `git log`
+	output by allowing them to allocate space in advance.
+
+-L <start>,<end>:<file>::
+-L :<funcname>:<file>::
+	Trace the evolution of the line range given by "<start>,<end>"
+	(or the function name regex <funcname>) within the <file>.  You may
+	not give any pathspec limiters.  This is currently limited to
+	a walk starting from a single revision, i.e., you may only
+	give zero or one positive revision arguments.
+	You can specify this option more than once.
++
+include::line-range-format.txt[]
+
+<revision range>::
+	Show only commits in the specified revision range.  When no
+	<revision range> is specified, it defaults to `HEAD` (i.e. the
+	whole history leading to the current commit).  `origin..HEAD`
+	specifies all the commits reachable from the current commit
+	(i.e. `HEAD`), but not from `origin`. For a complete list of
+	ways to spell <revision range>, see the 'Specifying Ranges'
+	section of linkgit:gitrevisions[7].
+
+[--] <path>...::
+	Show only commits that are enough to explain how the files
+	that match the specified paths came to be.  See 'History
+	Simplification' below for details and other simplification
+	modes.
++
+Paths may need to be prefixed with `--` to separate them from
+options or the revision range, when confusion arises.
+
+include::rev-list-options.txt[]
+
+include::pretty-formats.txt[]
+
+COMMON DIFF OPTIONS
+-------------------
+
+:git-log: 1
+include::diff-options.txt[]
+
+include::diff-generate-patch.txt[]
+
+EXAMPLES
+--------
+`git log --no-merges`::
+
+	Show the whole commit history, but skip any merges
+
+`git log v2.6.12.. include/scsi drivers/scsi`::
+
+	Show all commits since version 'v2.6.12' that changed any file
+	in the `include/scsi` or `drivers/scsi` subdirectories
+
+`git log --since="2 weeks ago" -- gitk`::
+
+	Show the changes during the last two weeks to the file 'gitk'.
+	The `--` is necessary to avoid confusion with the *branch* named
+	'gitk'
+
+`git log --name-status release..test`::
+
+	Show the commits that are in the "test" branch but not yet
+	in the "release" branch, along with the list of paths
+	each commit modifies.
+
+`git log --follow builtin/rev-list.c`::
+
+	Shows the commits that changed `builtin/rev-list.c`, including
+	those commits that occurred before the file was given its
+	present name.
+
+`git log --branches --not --remotes=origin`::
+
+	Shows all commits that are in any of local branches but not in
+	any of remote-tracking branches for 'origin' (what you have that
+	origin doesn't).
+
+`git log master --not --remotes=*/master`::
+
+	Shows all commits that are in local master but not in any remote
+	repository master branches.
+
+`git log -p -m --first-parent`::
+
+	Shows the history including change diffs, but only from the
+	``main branch'' perspective, skipping commits that come from merged
+	branches, and showing full diffs of changes introduced by the merges.
+	This makes sense only when following a strict policy of merging all
+	topic branches when staying on a single integration branch.
+
+`git log -L '/int main/',/^}/:main.c`::
+
+	Shows how the function `main()` in the file `main.c` evolved
+	over time.
+
+`git log -3`::
+
+	Limits the number of commits to show to 3.
+
+DISCUSSION
+----------
+
+include::i18n.txt[]
+
+CONFIGURATION
+-------------
+
+See linkgit:git-config[1] for core variables and linkgit:git-diff[1]
+for settings related to diff generation.
+
+format.pretty::
+	Default for the `--format` option.  (See 'Pretty Formats' above.)
+	Defaults to `medium`.
+
+i18n.logOutputEncoding::
+	Encoding to use when displaying logs.  (See 'Discussion' above.)
+	Defaults to the value of `i18n.commitEncoding` if set, and UTF-8
+	otherwise.
+
+log.date::
+	Default format for human-readable dates.  (Compare the
+	`--date` option.)  Defaults to "default", which means to write
+	dates like `Sat May 8 19:35:34 2010 -0500`.
++
+If the format is set to "auto:foo" and the pager is in use, format
+"foo" will be the used for the date format. Otherwise "default" will
+be used.
+
+log.follow::
+	If `true`, `git log` will act as if the `--follow` option was used when
+	a single <path> is given.  This has the same limitations as `--follow`,
+	i.e. it cannot be used to follow multiple files and does not work well
+	on non-linear history.
+
+log.showRoot::
+	If `false`, `git log` and related commands will not treat the
+	initial commit as a big creation event.  Any root commits in
+	`git log -p` output would be shown without a diff attached.
+	The default is `true`.
+
+log.showSignature::
+	If `true`, `git log` and related commands will act as if the
+	`--show-signature` option was passed to them.
+
+mailmap.*::
+	See linkgit:git-shortlog[1].
+
+notes.displayRef::
+	Which refs, in addition to the default set by `core.notesRef`
+	or `GIT_NOTES_REF`, to read notes from when showing commit
+	messages with the `log` family of commands.  See
+	linkgit:git-notes[1].
++
+May be an unabbreviated ref name or a glob and may be specified
+multiple times.  A warning will be issued for refs that do not exist,
+but a glob that does not match any refs is silently ignored.
++
+This setting can be disabled by the `--no-notes` option,
+overridden by the `GIT_NOTES_DISPLAY_REF` environment variable,
+and overridden by the `--notes=<ref>` option.
+
+GIT
+---
+Part of the linkgit:git[1] suite