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-check-attr(1)
+=================
+
+NAME
+----
+git-check-attr - Display gitattributes information
+
+
+SYNOPSIS
+--------
+[verse]
+'git check-attr' [-a | --all | <attr>...] [--] <pathname>...
+'git check-attr' --stdin [-z] [-a | --all | <attr>...]
+
+DESCRIPTION
+-----------
+For every pathname, this command will list if each attribute is 'unspecified',
+'set', or 'unset' as a gitattribute on that pathname.
+
+OPTIONS
+-------
+-a, --all::
+	List all attributes that are associated with the specified
+	paths.  If this option is used, then 'unspecified' attributes
+	will not be included in the output.
+
+--cached::
+	Consider `.gitattributes` in the index only, ignoring the working tree.
+
+--stdin::
+	Read pathnames from the standard input, one per line,
+	instead of from the command-line.
+
+-z::
+	The output format is modified to be machine-parseable.
+	If `--stdin` is also given, input paths are separated
+	with a NUL character instead of a linefeed character.
+
+\--::
+	Interpret all preceding arguments as attributes and all following
+	arguments as path names.
+
+If none of `--stdin`, `--all`, or `--` is used, the first argument
+will be treated as an attribute and the rest of the arguments as
+pathnames.
+
+OUTPUT
+------
+
+The output is of the form:
+<path> COLON SP <attribute> COLON SP <info> LF
+
+unless `-z` is in effect, in which case NUL is used as delimiter:
+<path> NUL <attribute> NUL <info> NUL
+
+
+<path> is the path of a file being queried, <attribute> is an attribute
+being queried and <info> can be either:
+
+'unspecified';; when the attribute is not defined for the path.
+'unset';;	when the attribute is defined as false.
+'set';;		when the attribute is defined as true.
+<value>;;	when a value has been assigned to the attribute.
+
+Buffering happens as documented under the `GIT_FLUSH` option in
+linkgit:git[1].  The caller is responsible for avoiding deadlocks
+caused by overfilling an input buffer or reading from an empty output
+buffer.
+
+EXAMPLES
+--------
+
+In the examples, the following '.gitattributes' file is used:
+---------------
+*.java diff=java -crlf myAttr
+NoMyAttr.java !myAttr
+README caveat=unspecified
+---------------
+
+* Listing a single attribute:
+---------------
+$ git check-attr diff org/example/MyClass.java
+org/example/MyClass.java: diff: java
+---------------
+
+* Listing multiple attributes for a file:
+---------------
+$ git check-attr crlf diff myAttr -- org/example/MyClass.java
+org/example/MyClass.java: crlf: unset
+org/example/MyClass.java: diff: java
+org/example/MyClass.java: myAttr: set
+---------------
+
+* Listing all attributes for a file:
+---------------
+$ git check-attr --all -- org/example/MyClass.java
+org/example/MyClass.java: diff: java
+org/example/MyClass.java: myAttr: set
+---------------
+
+* Listing an attribute for multiple files:
+---------------
+$ git check-attr myAttr -- org/example/MyClass.java org/example/NoMyAttr.java
+org/example/MyClass.java: myAttr: set
+org/example/NoMyAttr.java: myAttr: unspecified
+---------------
+
+* Not all values are equally unambiguous:
+---------------
+$ git check-attr caveat README
+README: caveat: unspecified
+---------------
+
+SEE ALSO
+--------
+linkgit:gitattributes[5].
+
+GIT
+---
+Part of the linkgit:git[1] suite