| 中文文章 | English article |
实验在一个新建临时仓库中创建 14 个相近的逻辑快照。它关闭全局 Git 配置、签名和调用方 hooks，不触碰当前项目。
lab_path=$(bash setup.sh)
bash verify.sh "$lab_path"
sed -n '1,200p' "$lab_path/observations.txt"
diff -u "$lab_path/show-before.txt" "$lab_path/show-after.txt"
sed -n '1,120p' "$lab_path/count-before.txt"
sed -n '1,120p' "$lab_path/count-after.txt"
bash cleanup.sh "$lab_path"
实验对同一个 commit 在 repack、commit-graph write、gc --no-prune 和已知孤立 blob 的 prune --expire=now 前后执行真实 git show，并断言输出完全一致。它还断言 pack/index 文件存在、git verify-pack 报告了 delta 对象、commit-graph 可验证，以及孤立 blob 已被 prune 删除。
count-objects 的输出只记录此机器和此数据集的物理观察。它不构成固定字节数、对象数量或性能结论。prune --expire=now 只在这个可删除的实验仓库中执行；不要把它照搬到正在协作、可能仍需恢复对象的仓库。
cleanup.sh 只删除带本实验标记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 14 similar logical snapshots in a new temporary repository. It disables global Git configuration, signing, and caller hooks, and it does not touch this project.
lab_path=$(bash setup.sh)
bash verify.sh "$lab_path"
sed -n '1,200p' "$lab_path/observations.txt"
diff -u "$lab_path/show-before.txt" "$lab_path/show-after.txt"
sed -n '1,120p' "$lab_path/count-before.txt"
sed -n '1,120p' "$lab_path/count-after.txt"
bash cleanup.sh "$lab_path"
For the same commit, the lab runs real git show before and after repack, commit-graph write, gc --no-prune, and prune --expire=now of a known orphan blob, then asserts byte-for-byte identical output. It also asserts pack/index structure, delta objects reported by git verify-pack, a verifiable commit-graph, and removal of the known orphan.
count-objects records only a physical observation for this machine and dataset. It is not a fixed byte, object-count, or performance conclusion. prune --expire=now runs only in this disposable repository; do not copy it to a collaborative repository that may still need object recovery.
cleanup.sh deletes only a marked, structurally complete temporary root. Skip cleanup while inspecting the evidence.
Run the complete self-test:
bash test.sh