Bug#1029846: freecad: after upgrading today, not possible to launch the program

[Tobias Frost]

Control: tags -1 upstream confirmed
Control: tags -1 forwarded https://github.com/FreeCAD/FreeCAD/issues/8206

On Thu, 02 Feb 2023 14:17:01 +0100 Corcier <corcier at laposte.net> wrote:
> ‌‌Dear all,
> 
> I have had the same issue after the last update.
> I managed to corner the problem finding that the *.desktop file call
> freecad with the --single-instance option and freecad does not
> recognise it. This option is added by the run_single-instance patch
> (see 1:). The issue arises because the new 0.20.2 does not seem to
> recognise the option anymore.
> The snap install of the same version does recognise the option so I
> should now compare the two sources (debianised sources and upstream)
> but run out of time. Anybody interested in investigating about this
> issue is welcome :)

Thanks for the pointer!

I think I've got more information:
freecad --help tells me that --single-instance should still be supported…

Might be a red herring:

running 
  freecad --single-instance
from a console, gives me a SEGV:

~/workspace/deb/packages/freecad/freecad$ freecad --single-instance
unknown option --single-instance
usage: freecad [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.
Program received signal SIGSEGV, Segmentation fault.
#0  /lib/x86_64-linux-gnu/libc.so.6(+0x3bf90) [0x7f500485af90]
#1  /lib/x86_64-linux-gnu/libc.so.6(+0x159139) [0x7f5004978139]
#2  /lib/x86_64-linux-gnu/libpython3.11.so.1.0(+0x2d0223) [0x7f50062d0223]
#3  /lib/x86_64-linux-gnu/libpython3.11.so.1.0(Py_EncodeLocale+0x4e) [0x7f50062d090e]
#4  freecad(+0x5034) [0x55c166ed1034]
#5  /lib/x86_64-linux-gnu/libc.so.6(+0x2718a) [0x7f500484618a]
#6  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f5004846245]
#7  freecad(+0x5ad1) [0x55c166ed1ad1]

This lead me to:
https://github.com/FreeCAD/FreeCAD/issues/8206

And it seems that there is a workaround:

> fwiw, both seem to work when an extra - is used, i.e. freecad - --dump-config and freecad - --single-instance

-- 
tobi