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

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

1 files changed, 203 insertions, 0 deletions

diff --git a/third_party/git/Documentation/git-diff.txt b/third_party/git/Documentation/git-diff.txt
new file mode 100644
index 000000000000..72179d993cb9
--- /dev/null
+++ b/third_party/git/Documentation/git-diff.txt
@@ -0,0 +1,203 @@
+git-diff(1)
+===========
+
+NAME
+----
+git-diff - Show changes between commits, commit and working tree, etc
+
+
+SYNOPSIS
+--------
+[verse]
+'git diff' [<options>] [<commit>] [--] [<path>...]
+'git diff' [<options>] --cached [<commit>] [--] [<path>...]
+'git diff' [<options>] <commit> <commit> [--] [<path>...]
+'git diff' [<options>] <blob> <blob>
+'git diff' [<options>] --no-index [--] <path> <path>
+
+DESCRIPTION
+-----------
+Show changes between the working tree and the index or a tree, changes
+between the index and a tree, changes between two trees, changes between
+two blob objects, or changes between two files on disk.
+
+'git diff' [<options>] [--] [<path>...]::
+
+	This form is to view the changes you made relative to
+	the index (staging area for the next commit).  In other
+	words, the differences are what you _could_ tell Git to
+	further add to the index but you still haven't.  You can
+	stage these changes by using linkgit:git-add[1].
+
+'git diff' [<options>] --no-index [--] <path> <path>::
+
+	This form is to compare the given two paths on the
+	filesystem.  You can omit the `--no-index` option when
+	running the command in a working tree controlled by Git and
+	at least one of the paths points outside the working tree,
+	or when running the command outside a working tree
+	controlled by Git.
+
+'git diff' [<options>] --cached [<commit>] [--] [<path>...]::
+
+	This form is to view the changes you staged for the next
+	commit relative to the named <commit>.  Typically you
+	would want comparison with the latest commit, so if you
+	do not give <commit>, it defaults to HEAD.
+	If HEAD does not exist (e.g. unborn branches) and
+	<commit> is not given, it shows all staged changes.
+	--staged is a synonym of --cached.
+
+'git diff' [<options>] <commit> [--] [<path>...]::
+
+	This form is to view the changes you have in your
+	working tree relative to the named <commit>.  You can
+	use HEAD to compare it with the latest commit, or a
+	branch name to compare with the tip of a different
+	branch.
+
+'git diff' [<options>] <commit> <commit> [--] [<path>...]::
+
+	This is to view the changes between two arbitrary
+	<commit>.
+
+'git diff' [<options>] <commit>..<commit> [--] [<path>...]::
+
+	This is synonymous to the previous form.  If <commit> on
+	one side is omitted, it will have the same effect as
+	using HEAD instead.
+
+'git diff' [<options>] <commit>\...<commit> [--] [<path>...]::
+
+	This form is to view the changes on the branch containing
+	and up to the second <commit>, starting at a common ancestor
+	of both <commit>.  "git diff A\...B" is equivalent to
+	"git diff $(git merge-base A B) B".  You can omit any one
+	of <commit>, which has the same effect as using HEAD instead.
+
+Just in case you are doing something exotic, it should be
+noted that all of the <commit> in the above description, except
+in the last two forms that use ".." notations, can be any
+<tree>.
+
+For a more complete list of ways to spell <commit>, see
+"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
+However, "diff" is about comparing two _endpoints_, not ranges,
+and the range notations ("<commit>..<commit>" and
+"<commit>\...<commit>") do not mean a range as defined in the
+"SPECIFYING RANGES" section in linkgit:gitrevisions[7].
+
+'git diff' [<options>] <blob> <blob>::
+
+	This form is to view the differences between the raw
+	contents of two blob objects.
+
+OPTIONS
+-------
+:git-diff: 1
+include::diff-options.txt[]
+
+-1 --base::
+-2 --ours::
+-3 --theirs::
+	Compare the working tree with the "base" version (stage #1),
+	"our branch" (stage #2) or "their branch" (stage #3).  The
+	index contains these stages only for unmerged entries i.e.
+	while resolving conflicts.  See linkgit:git-read-tree[1]
+	section "3-Way Merge" for detailed information.
+
+-0::
+	Omit diff output for unmerged entries and just show
+	"Unmerged".  Can be used only when comparing the working tree
+	with the index.
+
+<path>...::
+	The <paths> parameters, when given, are used to limit
+	the diff to the named paths (you can give directory
+	names and get diff for all files under them).
+
+
+include::diff-format.txt[]
+
+EXAMPLES
+--------
+
+Various ways to check your working tree::
++
+------------
+$ git diff            <1>
+$ git diff --cached   <2>
+$ git diff HEAD       <3>
+------------
++
+<1> Changes in the working tree not yet staged for the next commit.
+<2> Changes between the index and your last commit; what you
+    would be committing if you run "git commit" without "-a" option.
+<3> Changes in the working tree since your last commit; what you
+    would be committing if you run "git commit -a"
+
+Comparing with arbitrary commits::
++
+------------
+$ git diff test            <1>
+$ git diff HEAD -- ./test  <2>
+$ git diff HEAD^ HEAD      <3>
+------------
++
+<1> Instead of using the tip of the current branch, compare with the
+    tip of "test" branch.
+<2> Instead of comparing with the tip of "test" branch, compare with
+    the tip of the current branch, but limit the comparison to the
+    file "test".
+<3> Compare the version before the last commit and the last commit.
+
+Comparing branches::
++
+------------
+$ git diff topic master    <1>
+$ git diff topic..master   <2>
+$ git diff topic...master  <3>
+------------
++
+<1> Changes between the tips of the topic and the master branches.
+<2> Same as above.
+<3> Changes that occurred on the master branch since when the topic
+    branch was started off it.
+
+Limiting the diff output::
++
+------------
+$ git diff --diff-filter=MRC            <1>
+$ git diff --name-status                <2>
+$ git diff arch/i386 include/asm-i386   <3>
+------------
++
+<1> Show only modification, rename, and copy, but not addition
+    or deletion.
+<2> Show only names and the nature of change, but not actual
+    diff output.
+<3> Limit diff output to named subtrees.
+
+Munging the diff output::
++
+------------
+$ git diff --find-copies-harder -B -C  <1>
+$ git diff -R                          <2>
+------------
++
+<1> Spend extra cycles to find renames, copies and complete
+    rewrites (very expensive).
+<2> Output diff in reverse.
+
+SEE ALSO
+--------
+diff(1),
+linkgit:git-difftool[1],
+linkgit:git-log[1],
+linkgit:gitdiffcore[7],
+linkgit:git-format-patch[1],
+linkgit:git-apply[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite