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

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

third_party/git/t/t6000-rev-list-misc.sh

@@ -8,6 +8,7 @@ test_expect_success setup '
 	echo content1 >wanted_file &&
 	echo content2 >unwanted_file &&
 	git add wanted_file unwanted_file &&
+	test_tick &&
 	git commit -m one
 '
 
@@ -21,6 +22,7 @@ test_expect_success 'rev-list --objects with pathspecs and deeper paths' '
 	mkdir foo &&
 	>foo/file &&
 	git add foo/file &&
+	test_tick &&
 	git commit -m two &&
 
 	git rev-list --objects HEAD -- foo >output &&
@@ -69,6 +71,7 @@ test_expect_success '--no-object-names and --object-names are last-one-wins' '
 '
 
 test_expect_success 'rev-list A..B and rev-list ^A B are the same' '
+	test_tick &&
 	git commit --allow-empty -m another &&
 	git tag -a -m "annotated" v1.0 &&
 	git rev-list --objects ^v1.0^ v1.0 >expect &&
@@ -84,10 +87,10 @@ test_expect_success 'propagate uninteresting flag down correctly' '
 test_expect_success 'symleft flag bit is propagated down from tag' '
 	git log --format="%m %s" --left-right v1.0...master >actual &&
 	cat >expect <<-\EOF &&
-	> two
-	> one
 	< another
 	< that
+	> two
+	> one
 	EOF
 	test_cmp expect actual
 '
@@ -104,13 +107,16 @@ test_expect_success 'rev-list can show index objects' '
 	#   - we do not show the root tree; since we updated the index, it
 	#     does not have a valid cache tree
 	#
-	cat >expect <<-\EOF &&
-	8e4020bb5a8d8c873b25de15933e75cc0fc275df one
-	d9d3a7417b9605cfd88ee6306b28dadc29e6ab08 only-in-index
-	9200b628cf9dc883a85a7abc8d6e6730baee589c two
-	EOF
 	echo only-in-index >only-in-index &&
 	test_when_finished "git reset --hard" &&
+	rev1=$(git rev-parse HEAD:one) &&
+	rev2=$(git rev-parse HEAD:two) &&
+	revi=$(git hash-object only-in-index) &&
+	cat >expect <<-EOF &&
+	$rev1 one
+	$revi only-in-index
+	$rev2 two
+	EOF
 	git add only-in-index &&
 	git rev-list --objects --indexed-objects >actual &&
 	test_cmp expect actual
@@ -122,8 +128,8 @@ test_expect_success 'rev-list can negate index objects' '
 	test_cmp expect actual
 '
 
-test_expect_success '--bisect and --first-parent can not be combined' '
-	test_must_fail git rev-list --bisect --first-parent HEAD
+test_expect_success '--bisect and --first-parent can be combined' '
+	git rev-list --bisect --first-parent HEAD
 '
 
 test_expect_success '--header shows a NUL after each commit' '
@@ -140,4 +146,24 @@ test_expect_success '--header shows a NUL after each commit' '
 	test_cmp expect actual
 '
 
+test_expect_success 'rev-list --end-of-options' '
+	git update-ref refs/heads/--output=yikes HEAD &&
+	git rev-list --end-of-options --output=yikes >actual &&
+	test_path_is_missing yikes &&
+	git rev-list HEAD >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list --count' '
+	count=$(git rev-list --count HEAD) &&
+	git rev-list HEAD >actual &&
+	test_line_count = $count actual
+'
+
+test_expect_success 'rev-list --count --objects' '
+	count=$(git rev-list --count --objects HEAD) &&
+	git rev-list --objects HEAD >actual &&
+	test_line_count = $count actual
+'
+
 test_done