The etckeeper program is a tool to let /etc be stored in a git or mercurial repository. It hooks into APT to automatically commit changes made to /etc during package upgrades. It uses 'metastore' to track file metadata that version control systems do not normally support, but that is important for /etc, such as the permissions of /etc/shadow. It's quite modular and configurable, while also being simple to use if you understand the basics of working with version control.
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