Merge branch 'tr/rebase-root'

* tr/rebase-root:
  rebase: update documentation for --root
  rebase -i: learn to rebase root commit
  rebase: learn to rebase root commit
  rebase -i: execute hook only after argument checking

1 files changed, 187 insertions, 0 deletions

diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh
new file mode 100755
index 0000000000..6359580262
--- /dev/null
+++ b/t/t3412-rebase-root.sh
@@ -0,0 +1,187 @@
+#!/bin/sh
+
+test_description='git rebase --root
+
+Tests if git rebase --root --onto <newparent> can rebase the root commit.
+'
+. ./test-lib.sh
+
+test_expect_success 'prepare repository' '
+	echo 1 > A &&
+	git add A &&
+	git commit -m 1 &&
+	echo 2 > A &&
+	git add A &&
+	git commit -m 2 &&
+	git symbolic-ref HEAD refs/heads/other &&
+	rm .git/index &&
+	echo 3 > B &&
+	git add B &&
+	git commit -m 3 &&
+	echo 1 > A &&
+	git add A &&
+	git commit -m 1b &&
+	echo 4 > B &&
+	git add B &&
+	git commit -m 4
+'
+
+test_expect_success 'rebase --root expects --onto' '
+	test_must_fail git rebase --root
+'
+
+test_expect_success 'setup pre-rebase hook' '
+	mkdir -p .git/hooks &&
+	cat >.git/hooks/pre-rebase <<EOF &&
+#!$SHELL_PATH
+echo "\$1,\$2" >.git/PRE-REBASE-INPUT
+EOF
+	chmod +x .git/hooks/pre-rebase
+'
+cat > expect <<EOF
+4
+3
+2
+1
+EOF
+
+test_expect_success 'rebase --root --onto <newbase>' '
+	git checkout -b work &&
+	git rebase --root --onto master &&
+	git log --pretty=tformat:"%s" > rebased &&
+	test_cmp expect rebased
+'
+
+test_expect_success 'pre-rebase got correct input (1)' '
+	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
+'
+
+test_expect_success 'rebase --root --onto <newbase> <branch>' '
+	git branch work2 other &&
+	git rebase --root --onto master work2 &&
+	git log --pretty=tformat:"%s" > rebased2 &&
+	test_cmp expect rebased2
+'
+
+test_expect_success 'pre-rebase got correct input (2)' '
+	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work2
+'
+
+test_expect_success 'rebase -i --root --onto <newbase>' '
+	git checkout -b work3 other &&
+	GIT_EDITOR=: git rebase -i --root --onto master &&
+	git log --pretty=tformat:"%s" > rebased3 &&
+	test_cmp expect rebased3
+'
+
+test_expect_success 'pre-rebase got correct input (3)' '
+	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
+'
+
+test_expect_success 'rebase -i --root --onto <newbase> <branch>' '
+	git branch work4 other &&
+	GIT_EDITOR=: git rebase -i --root --onto master work4 &&
+	git log --pretty=tformat:"%s" > rebased4 &&
+	test_cmp expect rebased4
+'
+
+test_expect_success 'pre-rebase got correct input (4)' '
+	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work4
+'
+
+test_expect_success 'rebase -i -p with linear history' '
+	git checkout -b work5 other &&
+	GIT_EDITOR=: git rebase -i -p --root --onto master &&
+	git log --pretty=tformat:"%s" > rebased5 &&
+	test_cmp expect rebased5
+'
+
+test_expect_success 'pre-rebase got correct input (5)' '
+	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
+'
+
+test_expect_success 'set up merge history' '
+	git checkout other^ &&
+	git checkout -b side &&
+	echo 5 > C &&
+	git add C &&
+	git commit -m 5 &&
+	git checkout other &&
+	git merge side
+'
+
+sed 's/#/ /g' > expect-side <<'EOF'
+*   Merge branch 'side' into other
+|\##
+| * 5
+* | 4
+|/##
+* 3
+* 2
+* 1
+EOF
+
+test_expect_success 'rebase -i -p with merge' '
+	git checkout -b work6 other &&
+	GIT_EDITOR=: git rebase -i -p --root --onto master &&
+	git log --graph --topo-order --pretty=tformat:"%s" > rebased6 &&
+	test_cmp expect-side rebased6
+'
+
+test_expect_success 'set up second root and merge' '
+	git symbolic-ref HEAD refs/heads/third &&
+	rm .git/index &&
+	rm A B C &&
+	echo 6 > D &&
+	git add D &&
+	git commit -m 6 &&
+	git checkout other &&
+	git merge third
+'
+
+sed 's/#/ /g' > expect-third <<'EOF'
+*   Merge branch 'third' into other
+|\##
+| * 6
+* |   Merge branch 'side' into other
+|\ \##
+| * | 5
+* | | 4
+|/ /##
+* | 3
+|/##
+* 2
+* 1
+EOF
+
+test_expect_success 'rebase -i -p with two roots' '
+	git checkout -b work7 other &&
+	GIT_EDITOR=: git rebase -i -p --root --onto master &&
+	git log --graph --topo-order --pretty=tformat:"%s" > rebased7 &&
+	test_cmp expect-third rebased7
+'
+
+test_expect_success 'setup pre-rebase hook that fails' '
+	mkdir -p .git/hooks &&
+	cat >.git/hooks/pre-rebase <<EOF &&
+#!$SHELL_PATH
+false
+EOF
+	chmod +x .git/hooks/pre-rebase
+'
+
+test_expect_success 'pre-rebase hook stops rebase' '
+	git checkout -b stops1 other &&
+	GIT_EDITOR=: test_must_fail git rebase --root --onto master &&
+	test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops1
+	test 0 = $(git rev-list other...stops1 | wc -l)
+'
+
+test_expect_success 'pre-rebase hook stops rebase -i' '
+	git checkout -b stops2 other &&
+	GIT_EDITOR=: test_must_fail git rebase --root --onto master &&
+	test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops2
+	test 0 = $(git rev-list other...stops2 | wc -l)
+'
+
+test_done