Remove hardcoded CCDB path

Author: ktf

DataFormats/Parameters/src/GRPTool.cxx

@@ -10,6 +10,7 @@
 // or submit itself to any jurisdiction.
 
 #include <boost/program_options.hpp>
+#include <cstdlib>
 #include <string>
 #include "DataFormatsParameters/GRPECSObject.h"
 #include "DataFormatsParameters/GRPMagField.h"
@@ -43,6 +44,19 @@ enum class GRPCommand {
   kPRINTMAG
 };
 
+// CCDB host, overridable via ALICEO2_CCDB_HOST as the CCDB test suites do.
+// Without it this tool always contacts alice-ccdb.cern.ch, which CcdbApi flags
+// as needing an alien token -- fatal in CI, where CCDB is reached through a
+// local proxy instead.
+namespace
+{
+std::string defaultCCDBHost()
+{
+  const char* host = std::getenv("ALICEO2_CCDB_HOST");
+  return (host && *host) ? std::string(host) : std::string("http://alice-ccdb.cern.ch");
+}
+} // namespace
+
 // options struct filled from command line
 struct Options {
   std::vector<std::string> readout;
@@ -60,7 +74,7 @@ struct Options {
   bool print = false;         // whether to print outcome of GRP operation
   bool lhciffromccdb = false; // whether only to take GRPLHCIF from CCDB
   std::string publishto = "";
-  std::string ccdbhost = "http://alice-ccdb.cern.ch";
+  std::string ccdbhost = defaultCCDBHost();
   bool isRun5 = false; // whether or not this is supposed to be a Run5 detector configuration
   std::string vertex = "ccdb";
   std::string configKeyValues = "";