Public SourceMage Discussion List

[David Kowis <dkowis AT shlrm.org>]

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Maurizio Boriani wrote:
> Hi all,
>    I'm working on guile 1.8 spell and it break 
> compatibility with 1.6 (some 'module' which works with
> 1.6 doesn't works with 1.8). So I think the best way to 
> spellify this is:
> 
>                                                             START
>          0) test if guile 1.6 is installed (if not go on
>             with 1.8 installation)                          END
>          1) if 1.6 is installed check if other modules are
>             installed. 
>          1.a) If not go on with 1.8 installation            END
>          1.b) If yes check for module versions compatible 
>               with 1.8 (obviusly other guile depentens 
>               spells should be modified).
>          2.a) If all are compatible go on with upgrade      END
>          2.b) If not, ask the user what to do
>          3.a) user choose to go on wiht guile 1.8 
>               installation                                  END
>          3.b) user choose to do nothing                     END
>              
> Guile modules should check for required guile versions
> (and try if possible to prefer 1.8)
This looks like a safe plan of action. Although you could simply replace all 
this
(potentially) difficult logic with a warning and query defaulting to n for a
while. Of course, only display the warning if they've got modules for 1.6
installed, if that's not to difficult to detect.

Your process seems good. It's the system administrator's job to ensure that an
upgrade won't break their system.


Hope that helps,
David
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