Make shell outs to md5sum work on FreeBSD and OS X

Tested with OS X local connection and Linux remote. The paths to the
md5sum and md5 commands are hardcoded to the most common location. This
will definitely fail if the commands are elsewhere, or if the md5
command doesn't support the -q 'quiet' option.

lib/ansible/runner/__init__.py

@@ -476,8 +476,8 @@ class Runner(object):
         # compare old and new md5 for support of change hooks
         local_md5 = None
         if os.path.exists(dest):
-            local_md5 = os.popen("md5sum %s" % dest).read().split()[0]
-        remote_md5 = self._low_level_exec_command(conn, "md5sum %s" % source, tmp, True).split()[0]
+            local_md5 = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": dest}).read().split()[0]
+        remote_md5 = self._low_level_exec_command(conn, "/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": source}, tmp, True).split()[0]
 
         if remote_md5 != local_md5:
             # create the containing directories, if needed
@@ -486,7 +486,7 @@ class Runner(object):
 
             # fetch the file and check for changes
             conn.fetch_file(source, dest)
-            new_md5 = os.popen("md5sum %s" % dest).read().split()[0]
+            new_md5 = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": dest}).read().split()[0]
             if new_md5 != remote_md5:
                 result = dict(failed=True, msg="md5 mismatch", md5sum=new_md5)
                 return ReturnData(host=conn.host, result=result)

library/copy

@@ -60,9 +60,9 @@ if not os.path.exists(src):
 md5sum = None
 changed = False
 if os.path.exists(dest):
-    md5sum = os.popen("md5sum %s" % dest).read().split()[0]
+    md5sum = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": dest}).read().split()[0]
 
-md5sum2 = os.popen("md5sum %s" % src).read().split()[0]
+md5sum2 = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": src}).read().split()[0]
 
 if md5sum != md5sum2:
     os.system("cp %s %s" % (src, dest))

library/setup

@@ -345,7 +345,7 @@ md5sum = None
 if not os.path.exists(ansible_file):
     changed = True
 else:
-    md5sum = os.popen("md5sum %s" % ansible_file).read().split()[0]
+    md5sum = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": ansible_file}).read().split()[0]
 
 # Get some basic facts in case facter or ohai are not installed
 for (k, v) in ansible_facts().items():
@@ -394,7 +394,7 @@ reformat = json.dumps(setup_options, sort_keys=True, indent=4)
 f.write(reformat)
 f.close()
 
-md5sum2 = os.popen("md5sum %s" % ansible_file).read().split()[0]
+md5sum2 = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": ansible_file}).read().split()[0]
 
 if md5sum != md5sum2:
    changed = True