| 中文文章 | English article |
实验在一个新建临时根目录中创建 primary 主工作树和 feature linked worktree。它关闭全局 Git 配置、签名和调用方 hooks，所有提交只存在于临时仓库。
lab_path=$(bash setup.sh)
bash verify.sh "$lab_path"
sed -n '1,240p' "$lab_path/observations.txt"
sed -n '1,120p' "$lab_path/same-branch-results.txt"
bash cleanup.sh "$lab_path"
实验实际断言以下状态：两个工作树共享 common Git directory 中的对象和分支引用；HEAD、Index 路径和 Working Tree 彼此不同；main-note.txt 与 feature-note.txt 在提交前各自只出现在自己的 Index；Git 拒绝把已在 primary 检出的 main 再检出到 same-main，但允许不同的 feature/parallel 分支；主工作树合入 feature 后，feature 工作树仍停在自己的分支。
external-resource.txt 位于两个工作树之外，实验从两个上下文写入它。这只证明 Git 不管理仓库外的文件，不能用于推断真实并发时的写入顺序。
cleanup.sh 只删除带本实验标记并且结构完整的临时根目录。保留现场时跳过 cleanup。
一次运行完整自测：
bash test.sh
The lab creates a temporary root with a primary worktree and a linked feature worktree. It disables global Git configuration, signing, and caller hooks. Every commit remains in the temporary repository.
lab_path=$(bash setup.sh)
bash verify.sh "$lab_path"
sed -n '1,240p' "$lab_path/observations.txt"
sed -n '1,120p' "$lab_path/same-branch-results.txt"
bash cleanup.sh "$lab_path"
The lab asserts that the worktrees share objects and branch refs in the common Git directory while keeping distinct HEAD, index paths, and working trees. Before committing, main-note.txt appears only in the primary index and feature-note.txt only in the feature index. Git rejects a second checkout of main, already checked out by primary, while allowing the distinct feature/parallel branch. After the primary worktree merges feature, the feature worktree remains on its own branch.
external-resource.txt sits outside both worktrees and is written from both contexts. This proves that Git does not manage files outside the worktrees; it does not predict write order during real concurrent activity.
cleanup.sh deletes only a marked, structurally complete temporary root. Skip cleanup while inspecting the scene.
Run the complete self-test:
bash test.sh