From 3207d634576d48462b41b4aec0e9198293aa4a9f Mon Sep 17 00:00:00 2001
From: Mattias Ellert <mattias.ellert@physics.uu.se>
Date: Fri, 28 Jun 2019 09:23:19 +0200
Subject: [PATCH] Don't download input file if it already exists This allows
 running the tests with pre-fetched file in environments without network -
 like e.g. the Fedora package build server

---
 tutorials/dataframe/df014_CSVDataSource.C  | 3 ++-
 tutorials/dataframe/df014_CSVDataSource.py | 4 +++-
 tutorials/dataframe/df015_LazyDataSource.C | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/tutorials/dataframe/df014_CSVDataSource.C b/tutorials/dataframe/df014_CSVDataSource.C
index 18a6a5afaf..9f1b69688a 100644
--- a/tutorials/dataframe/df014_CSVDataSource.C
+++ b/tutorials/dataframe/df014_CSVDataSource.C
@@ -23,7 +23,8 @@ int df014_CSVDataSource()
    // The types of the columns will be automatically inferred.
    auto fileNameUrl = "http://root.cern.ch/files/tutorials/df014_CsvDataSource_MuRun2010B.csv";
    auto fileName = "df014_CsvDataSource_MuRun2010B_cpp.csv";
-   TFile::Cp(fileNameUrl, fileName);
+   if(gSystem->AccessPathName(fileName))
+      TFile::Cp(fileNameUrl, fileName);
    auto tdf = ROOT::RDF::MakeCsvDataFrame(fileName);
 
    // Now we will apply a first filter based on two columns of the CSV,
diff --git a/tutorials/dataframe/df014_CSVDataSource.py b/tutorials/dataframe/df014_CSVDataSource.py
index dd4823d62f..a8668f5e49 100644
--- a/tutorials/dataframe/df014_CSVDataSource.py
+++ b/tutorials/dataframe/df014_CSVDataSource.py
@@ -18,12 +18,14 @@
 ## \author Enric Tejedor
 
 import ROOT
+import os
 
 # Let's first create a RDF that will read from the CSV file.
 # The types of the columns will be automatically inferred.
 fileNameUrl = "http://root.cern.ch/files/tutorials/df014_CsvDataSource_MuRun2010B.csv"
 fileName = "df014_CsvDataSource_MuRun2010B_py.csv"
-ROOT.TFile.Cp(fileNameUrl, fileName)
+if not os.path.isfile(fileName):
+    ROOT.TFile.Cp(fileNameUrl, fileName)
 
 MakeCsvDataFrame = ROOT.ROOT.RDF.MakeCsvDataFrame
 tdf = MakeCsvDataFrame(fileName)
diff --git a/tutorials/dataframe/df015_LazyDataSource.C b/tutorials/dataframe/df015_LazyDataSource.C
index fc5567b5bd..f8623ddce4 100644
--- a/tutorials/dataframe/df015_LazyDataSource.C
+++ b/tutorials/dataframe/df015_LazyDataSource.C
@@ -25,7 +25,8 @@ int df015_LazyDataSource()
    // See the tutorial relative to CSV data sources for more details!
    auto fileNameUrl = "http://root.cern.ch/files/tutorials/df014_CsvDataSource_MuRun2010B.csv";
    auto fileName = "df015_CsvDataSource_MuRun2010B.csv";
-   TFile::Cp(fileNameUrl, fileName);
+   if(gSystem->AccessPathName(fileName))
+      TFile::Cp(fileNameUrl, fileName);
 
    auto csv_rdf = MakeCsvDataFrame(fileName);
 
-- 
2.21.0