Hacker News Daily 上看到這則：「Try: run a command and inspect its effects before changing your live system (github.com/binpash)」，這是一個 GitHub 專案：「binpash/try」。

整包軟體意外的簡單，是一隻 shell script，透過 OverlayFS 取得改變的部分：

try lets you run a command and inspect its effects before changing your live system. try uses Linux's namespaces (via unshare) and the overlayfs union filesystem.

記得 OverlayFS 在 Docker 用的很多，所以穩定性應該是沒什麼問題，不過專案開頭也有提到，這只是把 filesystem 層拆出來，不是很嚴謹的 sandbox 環境，像是 /dev 這邊的東西還是有穿透性，不要跑不信任的程式：

Please note that try is a prototype and not a full sandbox, and should not be used to execute commands that you don't already trust on your system, (i.e. devices in /dev are mounted in the sandbox, and network calls are all allowed.) Please do not attempt any commands that will remove everything in /dev or write zeros to your disks.

我覺得這個很適合拿來跑各種 install.sh 這種東西？有些 install.sh 不知道塞了多少垃圾 (像是 .bashrc 或是 .profile 都有可能會被動)，可以知道有哪些檔案要清會比較好。

把裡面的 try 這個檔案丟到自己的可執行目錄就裝好了，像是 ~/.local/bin 或是 ~/bin 之類的地方，看你的 $PATH 設定決定。

另外也可以從 subcommands 裡面的指令看到你可以用 try explore 啟動 shell 跑進去看：

Subcommands:
  try summary DIR   show the summary for the overlay in DIR
  try commit DIR    commit the overlay in DIR
  try explore DIR   start a shell inside the overlay in DIR

GitHub 上面的範例是用 pip 示範，同樣道理應該也可以看 npm 與其他套件。

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