protections for sourcing files

Author: chiarazampolli

DATA/common/setenv_calib.sh

@@ -7,7 +7,11 @@
 # if they are not explicitly disabled.
 # Then, configure data spec according to enabled calibrations
 
-source $O2DPG_ROOT/DATA/common/setenv.sh
+# used to avoid sourcing this file 2x
+SETUP_CALIB=1
+
+# the check on LIST_OF_DETECTORS should ensure that setenv.sh was not called before
+[[ -z ${LIST_OF_DETECTORS+z} ]] && source $O2DPG_ROOT/DATA/common/setenv.sh
 
 if [[ $BEAMTYPE != "cosmic" ]] || [[ $FORCECALIBRATIONS == 1 ]] ; then