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

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

third_party/git/t/t6019-rev-list-ancestry-path.sh

@@ -0,0 +1,156 @@
+#!/bin/sh
+
+test_description='--ancestry-path'
+
+#          D---E-------F
+#         /     \       \
+#    B---C---G---H---I---J
+#   /                     \
+#  A-------K---------------L--M
+#
+#  D..M                 == E F G H I J K L M
+#  --ancestry-path D..M == E F H I J L M
+#
+#  D..M -- M.t                 == M
+#  --ancestry-path D..M -- M.t == M
+#
+#  F...I                 == F G H I
+#  --ancestry-path F...I == F H I
+#
+#  G..M -- G.t                 == [nothing - was dropped in "-s ours" merge L]
+#  --ancestry-path G..M -- G.t == L
+#  --ancestry-path --simplify-merges G^..M -- G.t == G L
+
+. ./test-lib.sh
+
+test_merge () {
+	test_tick &&
+	git merge -s ours -m "$2" "$1" &&
+	git tag "$2"
+}
+
+test_expect_success setup '
+	test_commit A &&
+	test_commit B &&
+	test_commit C &&
+	test_commit D &&
+	test_commit E &&
+	test_commit F &&
+	git reset --hard C &&
+	test_commit G &&
+	test_merge E H &&
+	test_commit I &&
+	test_merge F J &&
+	git reset --hard A &&
+	test_commit K &&
+	test_merge J L &&
+	test_commit M
+'
+
+test_expect_success 'rev-list D..M' '
+	for c in E F G H I J K L M; do echo $c; done >expect &&
+	git rev-list --format=%s D..M |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list --ancestry-path D..M' '
+	for c in E F H I J L M; do echo $c; done >expect &&
+	git rev-list --ancestry-path --format=%s D..M |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list D..M -- M.t' '
+	echo M >expect &&
+	git rev-list --format=%s D..M -- M.t |
+	sed -e "/^commit /d" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list --ancestry-path D..M -- M.t' '
+	echo M >expect &&
+	git rev-list --ancestry-path --format=%s D..M -- M.t |
+	sed -e "/^commit /d" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list F...I' '
+	for c in F G H I; do echo $c; done >expect &&
+	git rev-list --format=%s F...I |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list --ancestry-path F...I' '
+	for c in F H I; do echo $c; done >expect &&
+	git rev-list --ancestry-path --format=%s F...I |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
+# G.t is dropped in an "-s ours" merge
+test_expect_success 'rev-list G..M -- G.t' '
+	git rev-list --format=%s G..M -- G.t |
+	sed -e "/^commit /d" >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'rev-list --ancestry-path G..M -- G.t' '
+	echo L >expect &&
+	git rev-list --ancestry-path --format=%s G..M -- G.t |
+	sed -e "/^commit /d" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-list --ancestry-path --simplify-merges G^..M -- G.t' '
+	for c in G L; do echo $c; done >expect &&
+	git rev-list --ancestry-path --simplify-merges --format=%s G^..M -- G.t |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
+#   b---bc
+#  / \ /
+# a   X
+#  \ / \
+#   c---cb
+#
+# All refnames prefixed with 'x' to avoid confusion with the tags
+# generated by test_commit on case-insensitive systems.
+test_expect_success 'setup criss-cross' '
+	mkdir criss-cross &&
+	(cd criss-cross &&
+	 git init &&
+	 test_commit A &&
+	 git checkout -b xb master &&
+	 test_commit B &&
+	 git checkout -b xc master &&
+	 test_commit C &&
+	 git checkout -b xbc xb -- &&
+	 git merge xc &&
+	 git checkout -b xcb xc -- &&
+	 git merge xb &&
+	 git checkout master)
+'
+
+# no commits in bc descend from cb
+test_expect_success 'criss-cross: rev-list --ancestry-path cb..bc' '
+	(cd criss-cross &&
+	 git rev-list --ancestry-path xcb..xbc > actual &&
+	 test -z "$(cat actual)")
+'
+
+# no commits in repository descend from cb
+test_expect_success 'criss-cross: rev-list --ancestry-path --all ^cb' '
+	(cd criss-cross &&
+	 git rev-list --ancestry-path --all ^xcb > actual &&
+	 test -z "$(cat actual)")
+'
+
+test_done