DiGraphGenerators: Use NautyExecutable(...).absolute_filename()

Author: Matthias Koeppe

src/sage/graphs/digraph_generators.py

@@ -63,7 +63,6 @@
 #                         http://www.gnu.org/licenses/
 ################################################################################
 from sage.cpython.string import bytes_to_str
-from sage.env import SAGE_NAUTY_BINS_PREFIX as nautyprefix
 
 import sys
 from sage.misc.randstate import current_randstate
@@ -528,7 +527,12 @@ def tournaments_nauty(self, n,
 
         nauty_input +=  " " + str(n) + " "
 
-        sp = subprocess.Popen(nautyprefix+"gentourng {0}".format(nauty_input), shell=True,
+        import shlex
+        from sage.features.nauty import NautyExecutable
+        gentourng_path = NautyExecutable("gentourng").absolute_filename()
+
+        sp = subprocess.Popen(shlex.quote(gentourng_path) + " {0}".format(nauty_input),
+                              shell=True,
                               stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE, close_fds=True)
 
@@ -636,8 +640,13 @@ def nauty_directg(self, graphs, options="", debug=False):
             options += ' -q'
 
         # Build directg input (graphs6 format)
-        input = ''.join(g.graph6_string()+'\n' for g in graphs)
-        sub = subprocess.Popen(nautyprefix+'directg {0}'.format(options),
+        input = ''.join(g.graph6_string() + '\n' for g in graphs)
+
+        import shlex
+        from sage.features.nauty import NautyExecutable
+        directg_path = NautyExecutable("directg").absolute_filename()
+
+        sub = subprocess.Popen(shlex.quote(directg_path) + ' {0}'.format(options),
                                shell=True,
                                stdout=subprocess.PIPE,
                                stdin=subprocess.PIPE,