[Bug 1007042] Re: [backportpackage] fails but worked last week

[Evan Broder]

We used to generate backport version numbers of the form
VERSION_BEING_BACKPORTED~RELEASE_CODENAME1. It worked well at the time
because it guaranteed that a backport of the same version to, e.g.,
natty would have a lower version number than the backport to oneiric,
since the n would sort before o. That's important because we rely on the
version numbers sorting like that for release upgrade paths with
backports to work.

Colin pointed out that this would break down when we ran out of letters
and started wrapping around, and suggested that we instead switch to
using the version number, which is what backportpackage now does.

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Title:
  [backportpackage] fails but worked last week

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