[Bug 2056556] [NEW] apt-add-repository incorrectly forces lowercase

[Malcolm Scott]

Public bug reported:

I have a local APT repository with a non-lowercase suite identifier.
apt-add-repository always forces it into lowercase, which causes apt to
emit warnings when it notices the mismatch:

$ sudo apt-add-repository "deb http://example.com/deb FooBar Baz"
Repository: 'deb http://example.com/ foobar Baz'
Description:
Archive for codename: foobar components: Baz
More info: http://example.com/
Adding repository.
Press [ENTER] to continue or Ctrl-c to cancel.
(...)
$ sudo apt update
(...)
W: Conflicting distribution: http://example.com/deb foobar InRelease (expected foobar but got FooBar)

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2056556

Title:
  apt-add-repository incorrectly forces lowercase

Status in software-properties package in Ubuntu:
  New

Bug description:
  I have a local APT repository with a non-lowercase suite identifier.
  apt-add-repository always forces it into lowercase, which causes apt
  to emit warnings when it notices the mismatch:

  $ sudo apt-add-repository "deb http://example.com/deb FooBar Baz"
  Repository: 'deb http://example.com/ foobar Baz'
  Description:
  Archive for codename: foobar components: Baz
  More info: http://example.com/
  Adding repository.
  Press [ENTER] to continue or Ctrl-c to cancel.
  (...)
  $ sudo apt update
  (...)
  W: Conflicting distribution: http://example.com/deb foobar InRelease (expected foobar but got FooBar)

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