more robust check of ISABELLE_PLATFORM_FAMILY within settings environment, to support its reunification with Isabelle/Scala (see also a33a6e541cbb, f3a356c64193);
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke the dotnet CLI driver within the Isabelle environment
if [ -z "$ISABELLE_DOTNET" ]; then
echo "Missing dotnet installation: need to run \"isabelle dotnet_setup\" first" >&2
exit 2
else
exec "$ISABELLE_DOTNET" "$@"
fi