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, 97 insertions, 0 deletions

diff --git a/third_party/git/t/t6414-merge-rename-nocruft.sh b/third_party/git/t/t6414-merge-rename-nocruft.sh
new file mode 100755
index 0000000000..a25e730460
--- /dev/null
+++ b/third_party/git/t/t6414-merge-rename-nocruft.sh
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+test_description='Merge-recursive merging renames'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	cat >A <<-\EOF &&
+	a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+	b bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+	c cccccccccccccccccccccccccccccccccccccccccccccccc
+	d dddddddddddddddddddddddddddddddddddddddddddddddd
+	e eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
+	f ffffffffffffffffffffffffffffffffffffffffffffffff
+	g gggggggggggggggggggggggggggggggggggggggggggggggg
+	h hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
+	i iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
+	j jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
+	k kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
+	l llllllllllllllllllllllllllllllllllllllllllllllll
+	m mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
+	n nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+	o oooooooooooooooooooooooooooooooooooooooooooooooo
+	EOF
+
+	cat >M <<-\EOF &&
+	A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+	B BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
+	C CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
+	D DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
+	E EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
+	F FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
+	G GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
+	H HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
+	I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
+	J JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ
+	K KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK
+	L LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+	M MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
+	N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
+	O OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
+	EOF
+
+	git add A M &&
+	git commit -m "initial has A and M" &&
+	git branch white &&
+	git branch red &&
+	git branch blue &&
+
+	git checkout white &&
+	sed -e "/^g /s/.*/g : white changes a line/" <A >B &&
+	sed -e "/^G /s/.*/G : colored branch changes a line/" <M >N &&
+	rm -f A M &&
+	git update-index --add --remove A B M N &&
+	git commit -m "white renames A->B, M->N" &&
+
+	git checkout red &&
+	echo created by red >R &&
+	git update-index --add R &&
+	git commit -m "red creates R" &&
+
+	git checkout blue &&
+	sed -e "/^o /s/.*/g : blue changes a line/" <A >B &&
+	rm -f A &&
+	mv B A &&
+	git update-index A &&
+	git commit -m "blue modify A" &&
+
+	git checkout master
+'
+
+# This test broke in 65ac6e9c3f47807cb603af07a6a9e1a43bc119ae
+test_expect_success 'merge white into red (A->B,M->N)' '
+	git checkout -b red-white red &&
+	git merge white &&
+	git write-tree &&
+	test_path_is_file B &&
+	test_path_is_file N &&
+	test_path_is_file R &&
+	test_path_is_missing A &&
+	test_path_is_missing M
+'
+
+# This test broke in 8371234ecaaf6e14fe3f2082a855eff1bbd79ae9
+test_expect_success 'merge blue into white (A->B, mod A, A untracked)' '
+	git checkout -b white-blue white &&
+	echo dirty >A &&
+	git merge blue &&
+	git write-tree &&
+	test_path_is_file A &&
+	echo dirty >expect &&
+	test_cmp expect A &&
+	test_path_is_file B &&
+	test_path_is_file N &&
+	test_path_is_missing M
+'
+
+test_done