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

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diff --git a/third_party/git/Documentation/git-status.txt b/third_party/git/Documentation/git-status.txt
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+git-status(1)
+=============
+
+NAME
+----
+git-status - Show the working tree status
+
+
+SYNOPSIS
+--------
+[verse]
+'git status' [<options>...] [--] [<pathspec>...]
+
+DESCRIPTION
+-----------
+Displays paths that have differences between the index file and the
+current HEAD commit, paths that have differences between the working
+tree and the index file, and paths in the working tree that are not
+tracked by Git (and are not ignored by linkgit:gitignore[5]). The first
+are what you _would_ commit by running `git commit`; the second and
+third are what you _could_ commit by running 'git add' before running
+`git commit`.
+
+OPTIONS
+-------
+
+-s::
+--short::
+	Give the output in the short-format.
+
+-b::
+--branch::
+	Show the branch and tracking info even in short-format.
+
+--show-stash::
+	Show the number of entries currently stashed away.
+
+--porcelain[=<version>]::
+	Give the output in an easy-to-parse format for scripts.
+	This is similar to the short output, but will remain stable
+	across Git versions and regardless of user configuration. See
+	below for details.
++
+The version parameter is used to specify the format version.
+This is optional and defaults to the original version 'v1' format.
+
+--long::
+	Give the output in the long-format. This is the default.
+
+-v::
+--verbose::
+	In addition to the names of files that have been changed, also
+	show the textual changes that are staged to be committed
+	(i.e., like the output of `git diff --cached`). If `-v` is specified
+	twice, then also show the changes in the working tree that
+	have not yet been staged (i.e., like the output of `git diff`).
+
+-u[<mode>]::
+--untracked-files[=<mode>]::
+	Show untracked files.
++
+The mode parameter is used to specify the handling of untracked files.
+It is optional: it defaults to 'all', and if specified, it must be
+stuck to the option (e.g. `-uno`, but not `-u no`).
++
+The possible options are:
++
+	- 'no'     - Show no untracked files.
+	- 'normal' - Shows untracked files and directories.
+	- 'all'    - Also shows individual files in untracked directories.
++
+When `-u` option is not used, untracked files and directories are
+shown (i.e. the same as specifying `normal`), to help you avoid
+forgetting to add newly created files.  Because it takes extra work
+to find untracked files in the filesystem, this mode may take some
+time in a large working tree.
+Consider enabling untracked cache and split index if supported (see
+`git update-index --untracked-cache` and `git update-index
+--split-index`), Otherwise you can use `no` to have `git status`
+return more quickly without showing untracked files.
++
+The default can be changed using the status.showUntrackedFiles
+configuration variable documented in linkgit:git-config[1].
+
+--ignore-submodules[=<when>]::
+	Ignore changes to submodules when looking for changes. <when> can be
+	either "none", "untracked", "dirty" or "all", which is the default.
+	Using "none" will consider the submodule modified when it either contains
+	untracked or modified files or its HEAD differs from the commit recorded
+	in the superproject and can be used to override any settings of the
+	'ignore' option in linkgit:git-config[1] or linkgit:gitmodules[5]. When
+	"untracked" is used submodules are not considered dirty when they only
+	contain untracked content (but they are still scanned for modified
+	content). Using "dirty" ignores all changes to the work tree of submodules,
+	only changes to the commits stored in the superproject are shown (this was
+	the behavior before 1.7.0). Using "all" hides all changes to submodules
+	(and suppresses the output of submodule summaries when the config option
+	`status.submoduleSummary` is set).
+
+--ignored[=<mode>]::
+	Show ignored files as well.
++
+The mode parameter is used to specify the handling of ignored files.
+It is optional: it defaults to 'traditional'.
++
+The possible options are:
++
+	- 'traditional' - Shows ignored files and directories, unless
+			  --untracked-files=all is specified, in which case
+			  individual files in ignored directories are
+			  displayed.
+	- 'no'	        - Show no ignored files.
+	- 'matching'    - Shows ignored files and directories matching an
+			  ignore pattern.
++
+When 'matching' mode is specified, paths that explicitly match an
+ignored pattern are shown. If a directory matches an ignore pattern,
+then it is shown, but not paths contained in the ignored directory. If
+a directory does not match an ignore pattern, but all contents are
+ignored, then the directory is not shown, but all contents are shown.
+
+-z::
+	Terminate entries with NUL, instead of LF.  This implies
+	the `--porcelain=v1` output format if no other format is given.
+
+--column[=<options>]::
+--no-column::
+	Display untracked files in columns. See configuration variable
+	column.status for option syntax.`--column` and `--no-column`
+	without options are equivalent to 'always' and 'never'
+	respectively.
+
+--ahead-behind::
+--no-ahead-behind::
+	Display or do not display detailed ahead/behind counts for the
+	branch relative to its upstream branch.  Defaults to true.
+
+--renames::
+--no-renames::
+	Turn on/off rename detection regardless of user configuration.
+	See also linkgit:git-diff[1] `--no-renames`.
+
+--find-renames[=<n>]::
+	Turn on rename detection, optionally setting the similarity
+	threshold.
+	See also linkgit:git-diff[1] `--find-renames`.
+
+<pathspec>...::
+	See the 'pathspec' entry in linkgit:gitglossary[7].
+
+OUTPUT
+------
+The output from this command is designed to be used as a commit
+template comment.
+The default, long format, is designed to be human readable,
+verbose and descriptive.  Its contents and format are subject to change
+at any time.
+
+The paths mentioned in the output, unlike many other Git commands, are
+made relative to the current directory if you are working in a
+subdirectory (this is on purpose, to help cutting and pasting). See
+the status.relativePaths config option below.
+
+Short Format
+~~~~~~~~~~~~
+
+In the short-format, the status of each path is shown as one of these
+forms
+
+	XY PATH
+	XY ORIG_PATH -> PATH
+
+where `ORIG_PATH` is where the renamed/copied contents came
+from. `ORIG_PATH` is only shown when the entry is renamed or
+copied. The `XY` is a two-letter status code.
+
+The fields (including the `->`) are separated from each other by a
+single space. If a filename contains whitespace or other nonprintable
+characters, that field will be quoted in the manner of a C string
+literal: surrounded by ASCII double quote (34) characters, and with
+interior special characters backslash-escaped.
+
+For paths with merge conflicts, `X` and `Y` show the modification
+states of each side of the merge. For paths that do not have merge
+conflicts, `X` shows the status of the index, and `Y` shows the status
+of the work tree.  For untracked paths, `XY` are `??`.  Other status
+codes can be interpreted as follows:
+
+* ' ' = unmodified
+* 'M' = modified
+* 'A' = added
+* 'D' = deleted
+* 'R' = renamed
+* 'C' = copied
+* 'U' = updated but unmerged
+
+Ignored files are not listed, unless `--ignored` option is in effect,
+in which case `XY` are `!!`.
+
+....
+X          Y     Meaning
+-------------------------------------------------
+	 [AMD]   not updated
+M        [ MD]   updated in index
+A        [ MD]   added to index
+D                deleted from index
+R        [ MD]   renamed in index
+C        [ MD]   copied in index
+[MARC]           index and work tree matches
+[ MARC]     M    work tree changed since index
+[ MARC]     D    deleted in work tree
+[ D]        R    renamed in work tree
+[ D]        C    copied in work tree
+-------------------------------------------------
+D           D    unmerged, both deleted
+A           U    unmerged, added by us
+U           D    unmerged, deleted by them
+U           A    unmerged, added by them
+D           U    unmerged, deleted by us
+A           A    unmerged, both added
+U           U    unmerged, both modified
+-------------------------------------------------
+?           ?    untracked
+!           !    ignored
+-------------------------------------------------
+....
+
+Submodules have more state and instead report
+		M    the submodule has a different HEAD than
+		     recorded in the index
+		m    the submodule has modified content
+		?    the submodule has untracked files
+since modified content or untracked files in a submodule cannot be added
+via `git add` in the superproject to prepare a commit.
+
+'m' and '?' are applied recursively. For example if a nested submodule
+in a submodule contains an untracked file, this is reported as '?' as well.
+
+If -b is used the short-format status is preceded by a line
+
+    ## branchname tracking info
+
+Porcelain Format Version 1
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Version 1 porcelain format is similar to the short format, but is guaranteed
+not to change in a backwards-incompatible way between Git versions or
+based on user configuration. This makes it ideal for parsing by scripts.
+The description of the short format above also describes the porcelain
+format, with a few exceptions:
+
+1. The user's color.status configuration is not respected; color will
+   always be off.
+
+2. The user's status.relativePaths configuration is not respected; paths
+   shown will always be relative to the repository root.
+
+There is also an alternate -z format recommended for machine parsing. In
+that format, the status field is the same, but some other things
+change.  First, the '\->' is omitted from rename entries and the field
+order is reversed (e.g 'from \-> to' becomes 'to from'). Second, a NUL
+(ASCII 0) follows each filename, replacing space as a field separator
+and the terminating newline (but a space still separates the status
+field from the first filename).  Third, filenames containing special
+characters are not specially formatted; no quoting or
+backslash-escaping is performed.
+
+Any submodule changes are reported as modified `M` instead of `m` or single `?`.
+
+Porcelain Format Version 2
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Version 2 format adds more detailed information about the state of
+the worktree and changed items.  Version 2 also defines an extensible
+set of easy to parse optional headers.
+
+Header lines start with "#" and are added in response to specific
+command line arguments.  Parsers should ignore headers they
+don't recognize.
+
+Branch Headers
+^^^^^^^^^^^^^^
+
+If `--branch` is given, a series of header lines are printed with
+information about the current branch.
+
+....
+Line                                     Notes
+------------------------------------------------------------
+# branch.oid <commit> | (initial)        Current commit.
+# branch.head <branch> | (detached)      Current branch.
+# branch.upstream <upstream_branch>      If upstream is set.
+# branch.ab +<ahead> -<behind>           If upstream is set and
+					 the commit is present.
+------------------------------------------------------------
+....
+
+Changed Tracked Entries
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Following the headers, a series of lines are printed for tracked
+entries.  One of three different line formats may be used to describe
+an entry depending on the type of change.  Tracked entries are printed
+in an undefined order; parsers should allow for a mixture of the 3
+line types in any order.
+
+Ordinary changed entries have the following format:
+
+    1 <XY> <sub> <mH> <mI> <mW> <hH> <hI> <path>
+
+Renamed or copied entries have the following format:
+
+    2 <XY> <sub> <mH> <mI> <mW> <hH> <hI> <X><score> <path><sep><origPath>
+
+....
+Field       Meaning
+--------------------------------------------------------
+<XY>        A 2 character field containing the staged and
+	    unstaged XY values described in the short format,
+	    with unchanged indicated by a "." rather than
+	    a space.
+<sub>       A 4 character field describing the submodule state.
+	    "N..." when the entry is not a submodule.
+	    "S<c><m><u>" when the entry is a submodule.
+	    <c> is "C" if the commit changed; otherwise ".".
+	    <m> is "M" if it has tracked changes; otherwise ".".
+	    <u> is "U" if there are untracked changes; otherwise ".".
+<mH>        The octal file mode in HEAD.
+<mI>        The octal file mode in the index.
+<mW>        The octal file mode in the worktree.
+<hH>        The object name in HEAD.
+<hI>        The object name in the index.
+<X><score>  The rename or copy score (denoting the percentage
+	    of similarity between the source and target of the
+	    move or copy). For example "R100" or "C75".
+<path>      The pathname.  In a renamed/copied entry, this
+	    is the target path.
+<sep>       When the `-z` option is used, the 2 pathnames are separated
+	    with a NUL (ASCII 0x00) byte; otherwise, a tab (ASCII 0x09)
+	    byte separates them.
+<origPath>  The pathname in the commit at HEAD or in the index.
+	    This is only present in a renamed/copied entry, and
+	    tells where the renamed/copied contents came from.
+--------------------------------------------------------
+....
+
+Unmerged entries have the following format; the first character is
+a "u" to distinguish from ordinary changed entries.
+
+    u <xy> <sub> <m1> <m2> <m3> <mW> <h1> <h2> <h3> <path>
+
+....
+Field       Meaning
+--------------------------------------------------------
+<XY>        A 2 character field describing the conflict type
+	    as described in the short format.
+<sub>       A 4 character field describing the submodule state
+	    as described above.
+<m1>        The octal file mode in stage 1.
+<m2>        The octal file mode in stage 2.
+<m3>        The octal file mode in stage 3.
+<mW>        The octal file mode in the worktree.
+<h1>        The object name in stage 1.
+<h2>        The object name in stage 2.
+<h3>        The object name in stage 3.
+<path>      The pathname.
+--------------------------------------------------------
+....
+
+Other Items
+^^^^^^^^^^^
+
+Following the tracked entries (and if requested), a series of
+lines will be printed for untracked and then ignored items
+found in the worktree.
+
+Untracked items have the following format:
+
+    ? <path>
+
+Ignored items have the following format:
+
+    ! <path>
+
+Pathname Format Notes and -z
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+When the `-z` option is given, pathnames are printed as is and
+without any quoting and lines are terminated with a NUL (ASCII 0x00)
+byte.
+
+Without the `-z` option, pathnames with "unusual" characters are
+quoted as explained for the configuration variable `core.quotePath`
+(see linkgit:git-config[1]).
+
+
+CONFIGURATION
+-------------
+
+The command honors `color.status` (or `status.color` -- they
+mean the same thing and the latter is kept for backward
+compatibility) and `color.status.<slot>` configuration variables
+to colorize its output.
+
+If the config variable `status.relativePaths` is set to false, then all
+paths shown are relative to the repository root, not to the current
+directory.
+
+If `status.submoduleSummary` is set to a non zero number or true (identical
+to -1 or an unlimited number), the submodule summary will be enabled for
+the long format and a summary of commits for modified submodules will be
+shown (see --summary-limit option of linkgit:git-submodule[1]). Please note
+that the summary output from the status command will be suppressed for all
+submodules when `diff.ignoreSubmodules` is set to 'all' or only for those
+submodules where `submodule.<name>.ignore=all`. To also view the summary for
+ignored submodules you can either use the --ignore-submodules=dirty command
+line option or the 'git submodule summary' command, which shows a similar
+output but does not honor these settings.
+
+BACKGROUND REFRESH
+------------------
+
+By default, `git status` will automatically refresh the index, updating
+the cached stat information from the working tree and writing out the
+result. Writing out the updated index is an optimization that isn't
+strictly necessary (`status` computes the values for itself, but writing
+them out is just to save subsequent programs from repeating our
+computation). When `status` is run in the background, the lock held
+during the write may conflict with other simultaneous processes, causing
+them to fail. Scripts running `status` in the background should consider
+using `git --no-optional-locks status` (see linkgit:git[1] for details).
+
+SEE ALSO
+--------
+linkgit:gitignore[5]
+
+GIT
+---
+Part of the linkgit:git[1] suite