merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 0 insertions, 47 deletions

diff --git a/third_party/git/Documentation/technical/api-setup.txt b/third_party/git/Documentation/technical/api-setup.txt
deleted file mode 100644
index eb1fa9853e..0000000000
--- a/third_party/git/Documentation/technical/api-setup.txt
+++ /dev/null
@@ -1,47 +0,0 @@
-setup API
-=========
-
-Talk about
-
-* setup_git_directory()
-* setup_git_directory_gently()
-* is_inside_git_dir()
-* is_inside_work_tree()
-* setup_work_tree()
-
-(Dscho)
-
-Pathspec
---------
-
-See glossary-context.txt for the syntax of pathspec. In memory, a
-pathspec set is represented by "struct pathspec" and is prepared by
-parse_pathspec(). This function takes several arguments:
-
-- magic_mask specifies what features that are NOT supported by the
-  following code. If a user attempts to use such a feature,
-  parse_pathspec() can reject it early.
-
-- flags specifies other things that the caller wants parse_pathspec to
-  perform.
-
-- prefix and args come from cmd_* functions
-
-parse_pathspec() helps catch unsupported features and reject them
-politely. At a lower level, different pathspec-related functions may
-not support the same set of features. Such pathspec-sensitive
-functions are guarded with GUARD_PATHSPEC(), which will die in an
-unfriendly way when an unsupported feature is requested.
-
-The command designers are supposed to make sure that GUARD_PATHSPEC()
-never dies. They have to make sure all unsupported features are caught
-by parse_pathspec(), not by GUARD_PATHSPEC. grepping GUARD_PATHSPEC()
-should give the designers all pathspec-sensitive codepaths and what
-features they support.
-
-A similar process is applied when a new pathspec magic is added. The
-designer lifts the GUARD_PATHSPEC restriction in the functions that
-support the new magic. At the same time (s)he has to make sure this
-new feature will be caught at parse_pathspec() in commands that cannot
-handle the new magic in some cases. grepping parse_pathspec() should
-help.