[Okular-devel] [okular] [Bug 340323] New: Okular unable to open .cbr files due to inabillity to find unrar due to unrar having removed the --version flag in unrar 5.2.1

[Jörg Schuck]

https://bugs.kde.org/show_bug.cgi?id=340323

            Bug ID: 340323
           Summary: Okular unable to open .cbr files due to inabillity to
                    find unrar due to unrar having removed the --version
                    flag in unrar 5.2.1
           Product: okular
           Version: 0.20.2
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Comicbook backend
          Assignee: okular-devel at kde.org
          Reporter: joerg_schuck at web.de

I tried to open a .cbr file today. Okular could not display it, claiming that
it can't find unrar. Since i had similar problems last year i checked the
package installation history and, yes i got an unrar update from 1:5.1.7-1 to
version 1:5.2.1-1

To be sure i checked the okular source code to see how the detection worked and
tried that manually. Results of that further below.

Reproducible: Always

Steps to Reproduce:
1. Install unrar verstion 1:5.2.1-1
2. Open .cbr file
3.Error

Actual Results:  
Empty file with error message displayed. Red error box in main okular window
claims it couldn't find unrar.

Expected Results:  
Display of the comic book contents.

Since okular basically calls unrar --version to determine which unrar flavor is
installed i tried

$ unrar --version

Which gave me this:
ERROR: Unknown option: -version

I noticed that it gave me only one - back so i tried:

$ unrar -v

Which gave me:
UNRAR 5.20 beta 1 freeware      Copyright (c) 1993-2014 Alexander Roshal

Downgrading unrar to 1:5.1.7-1 i tried it again, just to confirm:

$ unrar --version

The Result was:
UNRAR 5.11 beta 1 freeware      Copyright (c) 1993-2014 Alexander Roshal

So yeah, this unrar flavor only supports the short -v flag not the long
--version flag in version 1:5.2.1-1.

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