[Merge] lp:~sergiusens/goget-ubuntu-touch/installYaml into lp:goget-ubuntu-touch

[Sergio Schvezov]

Sergio Schvezov has proposed merging lp:~sergiusens/goget-ubuntu-touch/installYaml into lp:goget-ubuntu-touch with lp:~sergiusens/goget-ubuntu-touch/beBetter as a prerequisite.

Commit message:
Stamp a yaml with install/setup information

Requested reviews:
  Michael Vogt (mvo)
  PS Jenkins bot (ps-jenkins): continuous-integration
  Sergio Schvezov (sergiusens)

For more details, see:
https://code.launchpad.net/~sergiusens/goget-ubuntu-touch/installYaml/+merge/261865

* Record sideloads to ensure "snappy update" doesn't try to upgrade a system that uses custom 
  assets.

Creates a stamp file on the writable partition when --device-part= is specified. This is clearly trivial to defeat, but will allow snappy to refuse to update a system with such a stamp file.

There is a potential gotcha with this approach (albeit unlikely for anyone to hit it): if u-d-f is used to first download the set of s-i tar files and then u-d-f is called again with --device-part= pointing to the valid, official device part just downloaded, the stamp will still be created.


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