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# 2. a delta

The delta is 'ar' archive (see 'man ar'). The delta contains 'info', some data members (named by numbers), a script named 'patch.sh.xxx', and optional gpg signatures. The script recreates the new deb. See `do_delta_()` in the python code for more details.

## 2.1. the info in a delta

a delta first 'ar' member is always named 'info', and is a text file containing some keywords and informations regarding the delta itself. [TODO add details]

## 2.2. how to apply a delta

TODO WRITEME. You may look into `/usr/share/debdelta/debpatch.sh` to understand the basics.

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|  | new debdelta-upgrade service