Only run pep8 if available

1 files changed, 6 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 03c643d..ce0dae6 100644
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@ class Check(Command):
         if self.yarns:
             self.run_yarns()
 
-        if self.pep8:
+        if self.pep8 and self.command_is_available('pep8'):
             self.run_pep8()
 
     def run_unit_tests(self):
@@ -73,6 +73,11 @@ class Check(Command):
             ['yarn'] + glob.glob('yarns/*.yarn'),
             stdout=None, stderr=None)
 
+    def command_is_available(self, command_name):
+        exit_code, stdout, stderr = cliapp.runcmd_unchecked(
+            ['sh', '-c', 'command -v "$1"', '--', command_name])
+        return exit_code == 0
+
     def run_pep8(self):
         cliapp.runcmd(['pep8', 'distixlib'], stdout=None, stderr=None)