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-rwxr-xr-xt/t2407-worktree-heads.sh180
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diff --git a/t/t2407-worktree-heads.sh b/t/t2407-worktree-heads.sh
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+#!/bin/sh
+
+test_description='test operations trying to overwrite refs at worktree HEAD'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ test_commit init &&
+
+ for i in 1 2 3 4
+ do
+ git checkout -b conflict-$i &&
+ echo "not I" >$i.t &&
+ git add $i.t &&
+ git commit -m "will conflict" &&
+
+ git checkout - &&
+ test_commit $i &&
+ git branch wt-$i &&
+ git branch fake-$i &&
+ git worktree add wt-$i wt-$i || return 1
+ done &&
+
+ # Create a server that updates each branch by one commit
+ git init server &&
+ test_commit -C server initial &&
+ git remote add server ./server &&
+ for i in 1 2 3 4
+ do
+ git -C server checkout -b wt-$i &&
+ test_commit -C server A-$i || return 1
+ done &&
+ for i in 1 2
+ do
+ git -C server checkout -b fake-$i &&
+ test_commit -C server f-$i || return 1
+ done
+'
+
+test_expect_success 'refuse to overwrite: checked out in worktree' '
+ for i in 1 2 3 4
+ do
+ test_must_fail git branch -f wt-$i HEAD 2>err &&
+ grep "cannot force update the branch" err &&
+
+ test_must_fail git branch -D wt-$i 2>err &&
+ grep "Cannot delete branch" err || return 1
+ done
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in bisect' '
+ test_when_finished git -C wt-4 bisect reset &&
+
+ # Set up a bisect so HEAD no longer points to wt-4.
+ git -C wt-4 bisect start &&
+ git -C wt-4 bisect bad wt-4 &&
+ git -C wt-4 bisect good wt-1 &&
+
+ test_must_fail git branch -f wt-4 HEAD 2>err &&
+ grep "cannot force update the branch '\''wt-4'\'' checked out at.*wt-4" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase (apply)' '
+ test_when_finished git -C wt-2 rebase --abort &&
+
+ # This will fail part-way through due to a conflict.
+ test_must_fail git -C wt-2 rebase --apply conflict-2 &&
+
+ test_must_fail git branch -f wt-2 HEAD 2>err &&
+ grep "cannot force update the branch '\''wt-2'\'' checked out at.*wt-2" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase (merge)' '
+ test_when_finished git -C wt-2 rebase --abort &&
+
+ # This will fail part-way through due to a conflict.
+ test_must_fail git -C wt-2 rebase conflict-2 &&
+
+ test_must_fail git branch -f wt-2 HEAD 2>err &&
+ grep "cannot force update the branch '\''wt-2'\'' checked out at.*wt-2" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase with --update-refs' '
+ test_when_finished git -C wt-3 rebase --abort &&
+
+ git branch -f can-be-updated wt-3 &&
+ test_must_fail git -C wt-3 rebase --update-refs conflict-3 &&
+
+ for i in 3 4
+ do
+ test_must_fail git branch -f can-be-updated HEAD 2>err &&
+ grep "cannot force update the branch '\''can-be-updated'\'' checked out at.*wt-3" err ||
+ return 1
+ done
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: checked out' '
+ test_must_fail git fetch server +refs/heads/wt-3:refs/heads/wt-3 2>err &&
+ grep "refusing to fetch into branch '\''refs/heads/wt-3'\''" err &&
+
+ # General fetch into refs/heads/ will fail on first ref,
+ # so use a generic error message check.
+ test_must_fail git fetch server +refs/heads/*:refs/heads/* 2>err &&
+ grep "refusing to fetch into branch" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: worktree in bisect' '
+ test_when_finished git -C wt-4 bisect reset &&
+
+ # Set up a bisect so HEAD no longer points to wt-4.
+ git -C wt-4 bisect start &&
+ git -C wt-4 bisect bad wt-4 &&
+ git -C wt-4 bisect good wt-1 &&
+
+ test_must_fail git fetch server +refs/heads/wt-4:refs/heads/wt-4 2>err &&
+ grep "refusing to fetch into branch" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: worktree in rebase' '
+ test_when_finished git -C wt-3 rebase --abort &&
+
+ # This will fail part-way through due to a conflict.
+ test_must_fail git -C wt-3 rebase conflict-3 &&
+
+ test_must_fail git fetch server +refs/heads/wt-3:refs/heads/wt-3 2>err &&
+ grep "refusing to fetch into branch" err
+'
+
+test_expect_success 'refuse to overwrite when in error states' '
+ test_when_finished rm -rf .git/worktrees/wt-*/rebase-merge &&
+ test_when_finished rm -rf .git/worktrees/wt-*/BISECT_* &&
+
+ # Both branches are currently under rebase.
+ mkdir -p .git/worktrees/wt-3/rebase-merge &&
+ touch .git/worktrees/wt-3/rebase-merge/interactive &&
+ echo refs/heads/fake-1 >.git/worktrees/wt-3/rebase-merge/head-name &&
+ echo refs/heads/fake-2 >.git/worktrees/wt-3/rebase-merge/onto &&
+ mkdir -p .git/worktrees/wt-4/rebase-merge &&
+ touch .git/worktrees/wt-4/rebase-merge/interactive &&
+ echo refs/heads/fake-2 >.git/worktrees/wt-4/rebase-merge/head-name &&
+ echo refs/heads/fake-1 >.git/worktrees/wt-4/rebase-merge/onto &&
+
+ # Both branches are currently under bisect.
+ touch .git/worktrees/wt-4/BISECT_LOG &&
+ echo refs/heads/fake-2 >.git/worktrees/wt-4/BISECT_START &&
+ touch .git/worktrees/wt-1/BISECT_LOG &&
+ echo refs/heads/fake-1 >.git/worktrees/wt-1/BISECT_START &&
+
+ for i in 1 2
+ do
+ test_must_fail git branch -f fake-$i HEAD 2>err &&
+ grep "cannot force update the branch '\''fake-$i'\'' checked out at" err ||
+ return 1
+ done
+'
+
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite during rebase with --update-refs' '
+ git commit --fixup HEAD~2 --allow-empty &&
+ (
+ set_cat_todo_editor &&
+ test_must_fail git rebase -i --update-refs HEAD~3 >todo &&
+ ! grep "update-refs" todo
+ ) &&
+ git branch -f allow-update HEAD~2 &&
+ (
+ set_cat_todo_editor &&
+ test_must_fail git rebase -i --update-refs HEAD~3 >todo &&
+ grep "update-ref refs/heads/allow-update" todo
+ )
+'
+
+# This must be the last test in this file
+test_expect_success '$EDITOR and friends are unchanged' '
+ test_editor_unchanged
+'
+
+test_done