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, 19 insertions, 1 deletions

diff --git a/third_party/git/contrib/coccinelle/commit.cocci b/third_party/git/contrib/coccinelle/commit.cocci
index d03453341e84..af6dd4c20cae 100644
--- a/third_party/git/contrib/coccinelle/commit.cocci
+++ b/third_party/git/contrib/coccinelle/commit.cocci
@@ -20,7 +20,7 @@ expression s;
 + set_commit_tree(c, s)
   ...>}
 
-// These excluded functions must access c->maybe_tree direcly.
+// These excluded functions must access c->maybe_tree directly.
 // Note that if c->maybe_tree is written somewhere outside of these
 // functions, then the recommended transformation will be bogus with
 // repo_get_commit_tree() on the LHS.
@@ -32,3 +32,21 @@ expression c;
 - c->maybe_tree
 + repo_get_commit_tree(specify_the_right_repo_here, c)
   ...>}
+
+@@
+struct commit *c;
+expression E;
+@@
+(
+- c->generation = E;
++ commit_graph_data_at(c)->generation = E;
+|
+- c->graph_pos = E;
++ commit_graph_data_at(c)->graph_pos = E;
+|
+- c->generation
++ commit_graph_generation(c)
+|
+- c->graph_pos
++ commit_graph_position(c)
+)