kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxx>]

This is *the* fatal flaw with the cache library.  User's assume it is
stale symbols or a temporary copy.  It is not.  It is a snapshot of the
current library symbols linked to the symbols in the schematic.  It gets
refreshed every time the schematic is saved.  Once you delete this file
or keep an out of date copy using cvs, all bets are off.  It is only a
matter of time before one of your symbol libraries changes or gets
removed and you will end up with a broken schematic.  The rescue code
depends on the cache being up to date in order preserve you schematic.
If the cache is not current, the rescuing cannot be guaranteed.

On 11/24/2017 06:38 AM, hauptmech wrote:
> One the one hand, yes, if there is a cache file you can take advantage
> of the fact that it is a stale copy of the old parts.
> 
> On the other hand, since caches are, by definition, temporary copies of
> data, they don't get versioned or archived in my projects. (The kicad
> libraries, and binaries, were though).
> 
> On 24 Nov 2017 10:21 pm, "Nick Østergaard" <oe.nick@xxxxxxxxx
> <mailto:oe.nick@xxxxxxxxx>> wrote:
> 
>     This would haven been resolved if you kept the cache lib, IIRC.
> 
>     Den 24. nov. 2017 4.48 AM skrev "hauptmech" <hauptmech@xxxxxxxxx
>     <mailto:hauptmech@xxxxxxxxx>>:
> 
>         I can confirm unconnected wires. It may be worth noting that I
>         did not preserve the -cache.lib file when I archived the design.
> 
>         I also had an issue with an old asymmetric diode footprint
>         having its anode and cathode reversed when I used it in a new
>         design. If pin numbers in the library got swapped around, then
>         now I know why.
> 
>         For myself, I would much rather that the old library parts get
>         loaded with my old design instead of trying to convert old parts
>         to new parts. Is it unreasonable to do that? Load the design
>         with the old parts and then do the rescue/migration rename? That
>         way the old parts go into the -rescue.lib file unchanged except
>         for a name modification. Including the old parts lib (perhaps
>         concatenated into one file) does not seem too difficult.
> 
> 
> 
> 
> 
>         On 24/11/17 10:09, Wayne Stambaugh wrote:
> 
>             I stand corrected.  I just looked and pin numbers are checked by
>             position so swapped pins should get rescued.  What isn't
>             rescued is pins
>             that changed length which is a bit surprising since that
>             would possibly
>             leave unconnected wires.  I'm not sure why it was done this
>             way but I
>             guess I'll have to do some testing before the stable 5
>             release to see if
>             it needs to be fixed.
> 
>             On 11/23/2017 11:12 AM, Nick Østergaard wrote:
> 
>                 Maybe I am mistaken then.
> 
>                 2017-11-23 13:21 GMT+01:00 Wayne Stambaugh
>                 <stambaughw@xxxxxxxxx <mailto:stambaughw@xxxxxxxxx>
>                 <mailto:stambaughw@xxxxxxxxx
>                 <mailto:stambaughw@xxxxxxxxx>>>:
> 
>                      On 11/22/2017 11:02 PM, hauptmech wrote:
>                      > When opening an old design I noticed that the C
>                 and R symbol pin nodes
>                      > changed position (I'm guessing other symbols as
>                 well), breaking the
>                      > schematic. Did the people who changed these
>                 symbols have a plan for
>                      > migrating old designs? Is the 'rescue' supposed
>                 to handle this?
>                      >
> 
>                      AFAIK, the rescuer does not handle this case.  I'm
>                 not even sure if it
>                      could.  That's something someone would have to take
>                 a look at.
> 
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