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/t3704-add-pathspec-file.sh

@@ -0,0 +1,159 @@
+#!/bin/sh
+
+test_description='add --pathspec-from-file'
+
+. ./test-lib.sh
+
+test_tick
+
+test_expect_success setup '
+	test_commit file0 &&
+	echo A >fileA.t &&
+	echo B >fileB.t &&
+	echo C >fileC.t &&
+	echo D >fileD.t
+'
+
+restore_checkpoint () {
+	git reset
+}
+
+verify_expect () {
+	git status --porcelain --untracked-files=no -- fileA.t fileB.t fileC.t fileD.t >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success '--pathspec-from-file from stdin' '
+	restore_checkpoint &&
+
+	echo fileA.t | git add --pathspec-from-file=- &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	EOF
+	verify_expect
+'
+
+test_expect_success '--pathspec-from-file from file' '
+	restore_checkpoint &&
+
+	echo fileA.t >list &&
+	git add --pathspec-from-file=list &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'NUL delimiters' '
+	restore_checkpoint &&
+
+	printf "fileA.t\0fileB.t\0" | git add --pathspec-from-file=- --pathspec-file-nul &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	A  fileB.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'LF delimiters' '
+	restore_checkpoint &&
+
+	printf "fileA.t\nfileB.t\n" | git add --pathspec-from-file=- &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	A  fileB.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'no trailing delimiter' '
+	restore_checkpoint &&
+
+	printf "fileA.t\nfileB.t" | git add --pathspec-from-file=- &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	A  fileB.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'CRLF delimiters' '
+	restore_checkpoint &&
+
+	printf "fileA.t\r\nfileB.t\r\n" | git add --pathspec-from-file=- &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	A  fileB.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'quotes' '
+	restore_checkpoint &&
+
+	cat >list <<-\EOF &&
+	"file\101.t"
+	EOF
+
+	git add --pathspec-from-file=list &&
+
+	cat >expect <<-\EOF &&
+	A  fileA.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'quotes not compatible with --pathspec-file-nul' '
+	restore_checkpoint &&
+
+	cat >list <<-\EOF &&
+	"file\101.t"
+	EOF
+
+	test_must_fail git add --pathspec-from-file=list --pathspec-file-nul
+'
+
+test_expect_success 'only touches what was listed' '
+	restore_checkpoint &&
+
+	printf "fileB.t\nfileC.t\n" | git add --pathspec-from-file=- &&
+
+	cat >expect <<-\EOF &&
+	A  fileB.t
+	A  fileC.t
+	EOF
+	verify_expect
+'
+
+test_expect_success 'error conditions' '
+	restore_checkpoint &&
+	echo fileA.t >list &&
+	>empty_list &&
+
+	test_must_fail git add --pathspec-from-file=list --interactive 2>err &&
+	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+
+	test_must_fail git add --pathspec-from-file=list --patch 2>err &&
+	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+
+	test_must_fail git add --pathspec-from-file=list --edit 2>err &&
+	test_i18ngrep -e "--pathspec-from-file is incompatible with --edit" err &&
+
+	test_must_fail git add --pathspec-from-file=list -- fileA.t 2>err &&
+	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+
+	test_must_fail git add --pathspec-file-nul 2>err &&
+	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+
+	# This case succeeds, but still prints to stderr
+	git add --pathspec-from-file=empty_list 2>err &&
+	test_i18ngrep -e "Nothing specified, nothing added." err
+'
+
+test_done