merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/t/t4204-patch-id.sh

@@ -0,0 +1,196 @@
+#!/bin/sh
+
+test_description='git patch-id'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	as="a a a a a a a a" && # eight a
+	test_write_lines $as >foo &&
+	test_write_lines $as >bar &&
+	git add foo bar &&
+	git commit -a -m initial &&
+	test_write_lines $as b >foo &&
+	test_write_lines $as b >bar &&
+	git commit -a -m first &&
+	git checkout -b same master &&
+	git commit --amend -m same-msg &&
+	git checkout -b notsame master &&
+	echo c >foo &&
+	echo c >bar &&
+	git commit --amend -a -m notsame-msg &&
+	test_write_lines bar foo >bar-then-foo &&
+	test_write_lines foo bar >foo-then-bar
+'
+
+test_expect_success 'patch-id output is well-formed' '
+	git log -p -1 | git patch-id >output &&
+	grep "^[a-f0-9]\{40\} $(git rev-parse HEAD)$" output
+'
+
+#calculate patch id. Make sure output is not empty.
+calc_patch_id () {
+	patch_name="$1"
+	shift
+	git patch-id "$@" |
+	sed "s/ .*//" >patch-id_"$patch_name" &&
+	test_line_count -gt 0 patch-id_"$patch_name"
+}
+
+get_top_diff () {
+	git log -p -1 "$@" -O bar-then-foo --
+}
+
+get_patch_id () {
+	get_top_diff "$1" | calc_patch_id "$@"
+}
+
+test_expect_success 'patch-id detects equality' '
+	get_patch_id master &&
+	get_patch_id same &&
+	test_cmp patch-id_master patch-id_same
+'
+
+test_expect_success 'patch-id detects inequality' '
+	get_patch_id master &&
+	get_patch_id notsame &&
+	! test_cmp patch-id_master patch-id_notsame
+'
+
+test_expect_success 'patch-id supports git-format-patch output' '
+	get_patch_id master &&
+	git checkout same &&
+	git format-patch -1 --stdout | calc_patch_id same &&
+	test_cmp patch-id_master patch-id_same &&
+	set $(git format-patch -1 --stdout | git patch-id) &&
+	test "$2" = $(git rev-parse HEAD)
+'
+
+test_expect_success 'whitespace is irrelevant in footer' '
+	get_patch_id master &&
+	git checkout same &&
+	git format-patch -1 --stdout | sed "s/ \$//" | calc_patch_id same &&
+	test_cmp patch-id_master patch-id_same
+'
+
+cmp_patch_id () {
+	if
+		test "$1" = "relevant"
+	then
+		! test_cmp patch-id_"$2" patch-id_"$3"
+	else
+		test_cmp patch-id_"$2" patch-id_"$3"
+	fi
+}
+
+test_patch_id_file_order () {
+	relevant="$1"
+	shift
+	name="order-${1}-$relevant"
+	shift
+	get_top_diff "master" | calc_patch_id "$name" "$@" &&
+	git checkout same &&
+	git format-patch -1 --stdout -O foo-then-bar |
+		calc_patch_id "ordered-$name" "$@" &&
+	cmp_patch_id $relevant "$name" "ordered-$name"
+
+}
+
+# combined test for options: add more tests here to make them
+# run with all options
+test_patch_id () {
+	test_patch_id_file_order "$@"
+}
+
+# small tests with detailed diagnostic for basic options.
+test_expect_success 'file order is irrelevant with --stable' '
+	test_patch_id_file_order irrelevant --stable --stable
+'
+
+test_expect_success 'file order is relevant with --unstable' '
+	test_patch_id_file_order relevant --unstable --unstable
+'
+
+#Now test various option combinations.
+test_expect_success 'default is unstable' '
+	test_patch_id relevant default
+'
+
+test_expect_success 'patchid.stable = true is stable' '
+	test_config patchid.stable true &&
+	test_patch_id irrelevant patchid.stable=true
+'
+
+test_expect_success 'patchid.stable = false is unstable' '
+	test_config patchid.stable false &&
+	test_patch_id relevant patchid.stable=false
+'
+
+test_expect_success '--unstable overrides patchid.stable = true' '
+	test_config patchid.stable true &&
+	test_patch_id relevant patchid.stable=true--unstable --unstable
+'
+
+test_expect_success '--stable overrides patchid.stable = false' '
+	test_config patchid.stable false &&
+	test_patch_id irrelevant patchid.stable=false--stable --stable
+'
+
+test_expect_success 'patch-id supports git-format-patch MIME output' '
+	get_patch_id master &&
+	git checkout same &&
+	git format-patch -1 --attach --stdout | calc_patch_id same &&
+	test_cmp patch-id_master patch-id_same
+'
+
+test_expect_success 'patch-id respects config from subdir' '
+	test_config patchid.stable true &&
+	mkdir subdir &&
+
+	# copy these because test_patch_id() looks for them in
+	# the current directory
+	cp bar-then-foo foo-then-bar subdir &&
+
+	(
+		cd subdir &&
+		test_patch_id irrelevant patchid.stable=true
+	)
+'
+
+cat >nonl <<\EOF
+diff --git i/a w/a
+index e69de29..2e65efe 100644
+--- i/a
++++ w/a
+@@ -0,0 +1 @@
++a
+\ No newline at end of file
+diff --git i/b w/b
+index e69de29..6178079 100644
+--- i/b
++++ w/b
+@@ -0,0 +1 @@
++b
+EOF
+
+cat >withnl <<\EOF
+diff --git i/a w/a
+index e69de29..7898192 100644
+--- i/a
++++ w/a
+@@ -0,0 +1 @@
++a
+diff --git i/b w/b
+index e69de29..6178079 100644
+--- i/b
++++ w/b
+@@ -0,0 +1 @@
++b
+EOF
+
+test_expect_success 'patch-id handles no-nl-at-eof markers' '
+	cat nonl | calc_patch_id nonl &&
+	cat withnl | calc_patch_id withnl &&
+	test_cmp patch-id_nonl patch-id_withnl
+'
+test_done