protections for sourcing files

[chiarazampolli]

No description provided.

[davidrohr]

@chiarazampolli : How is it happening that it is sourced twice?
Probably in your local tests where you run the dpl-workflow.sh and the aggregator as one workflow?
I assume in that case we have the same problem also with setenv.sh and with getCommonArgs.sh?
Perhaps we could just change the aggregator script to not source anything if CALIB_LOCAL_AGGREGATOR=1? (as suggested in AliceO2Group/AliceO2#8736)
Or we have to add protection to the other scripts as well.
Although, in general I am also not principally against putting protections everywhere.

[chiarazampolli]

I added protections everywhere (unless I forgot something), just for safety.
The only things I did not touch is the dpl-workflow.sh, the setenv.sh and getCommonArgs.sh

[chiarazampolli]

Ciao @davidrohr ,

If this is fine, could you merge it? Then, since there are new changes, I will do some tests for the one in O2 before removing the WIP.

Chiara