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, 12 insertions, 0 deletions

diff --git a/third_party/git/prompt.c b/third_party/git/prompt.c
index 6d5885d00964..5ded21a017f1 100644
--- a/third_party/git/prompt.c
+++ b/third_party/git/prompt.c
@@ -74,3 +74,15 @@ char *git_prompt(const char *prompt, int flags)
 	}
 	return r;
 }
+
+int git_read_line_interactively(struct strbuf *line)
+{
+	int ret;
+
+	fflush(stdout);
+	ret = strbuf_getline_lf(line, stdin);
+	if (ret != EOF)
+		strbuf_trim_trailing_newline(line);
+
+	return ret;
+}