[ubuntu-mono] [Bug 877776] Re: openbve does not depend on the required package libmono-i18n4.0-all

[Alessandro Menti]

Tested on a fresh install of Ubuntu Oneiric as per
<https://wiki.ubuntu.com/QATeam/PerformingSRUVerification> using the
test case in the bug description: bug solved with the package in
-proposed, OpenBVE starts correctly. More testing to follow to check no
regressions have been introduced (could not complete it yet due to the
poor framerate of the emulated graphic card which makes the program run
slowly when 3D graphics is shown).

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https://bugs.launchpad.net/bugs/877776

Title:
  openbve does not depend on the required package libmono-i18n4.0-all

Status in “openbve” package in Ubuntu:
  Fix Released
Status in “openbve” source package in Oneiric:
  Fix Committed

Bug description:
  openBVE does not run since I upgraded from Natty a few days ago. This is the terminal output
  ~$openbve
  System.NotSupportedException: CodePage 37 not supported
    at System.Text.Encoding.GetEncoding (Int32 codepage) [0x00000] in <filename unknown>:0
    at System.Text.EncodingInfo.GetEncoding () [0x00000] in <filename unknown>:0
    at System.Text.EncodingInfo.get_Name () [0x00000] in <filename unknown>:0
    at System.Text.EncodingInfo.get_DisplayName () [0x00000] in <filename unknown>:0
    at OpenBve.formMain.formMain_Load (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0
    at System.Windows.Forms.Form.OnLoad (System.EventArgs e) [0x00000] in <filename unknown>:0
    at System.Windows.Forms.Form.OnLoadInternal (System.EventArgs e) [0x00000] in <filename unknown>:0
  =====
  SRU information

  [Impact]
  The bug always occurs on Ubuntu installations in case the libmono-i18n4.0-all package has not been installed and prevents OpenBVE from being run. Severity set to medium as the bug severly impacts a non-core application, but a workaround is present (see Test Case section).
  Justification for backporting: fixing the missing dependency problem allows the users to install and run OpenBVE in a straightforward way without searching for workarounds on the Internet and installing the missing package manually.

  [Development Fix]
  The openbve package has been modified by including the missing dependency (libmono-i18n4.0-all) in the Depends: section of the debian/control file.
  Number of modified packages: 1 (openbve - original version: 1.2.10.0-0ubuntu2, new version in Precise: 1.2.10.0-0ubuntu3)

  [Stable Fix]
  The fix is supplied as a debdiff against the original version of OpenBVE in comment #22: <https://bugs.launchpad.net/ubuntu/oneiric/+source/openbve/+bug/877776/+attachment/2625704/+files/openbve_1.2.10.0-0ubuntu2.1.debdiff>

  [Test Case]
  1) Start from a clean Ubuntu installation. Make sure that the libmono-i18n4.0-all package is not installed on the system.
  2) Install OpenBVE by opening a terminal and running:
  sudo apt-get install openbve
  3) Try running OpenBVE from the terminal with the command:
  openbve
  The program should display the error message shown at the top of this description ("System.NotSupportedException: CodePage 37 not supported") in the terminal itself and the Mono interpreter ("cli" process) should start looping, eating a single CPU core. The main OpenBVE window should not be shown.
  4) Kill the "cli" process.
  5) Install the updated package. apt-get should prompt you to install the missing dependency libmono-i18n4.0-all as well.
  6) Try running "openbve" again from the terminal: the program should run and display the main OpenBVE window.

  A screenshot of the main OpenBVE windows is provided by the author of
  the program at <http://trainsimframework.org/common/screen_z1.jpg>.
  Please note that, in the Ubuntu version, the command buttons on the
  left are replaced by option buttons; the rest of the window is the
  same.

  [Regression Potential]
  No potential regressions should occur in OpenBVE itself as no code has been changed. It's possible, however, that other badly-written Mono/.NET programs might be affected by the installation of the new Mono library.

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