forgot this file

poopen.py

@@ -0,0 +1,27 @@
+import subprocess as sp
+
+# subprocess doesn't come with very useful wrappers,
+# so let's write our own!
+
+class PoopenError(sp.CalledProcessError):
+    def __init__(self, returncode, cmd, output=None, error=None):
+        self.returncode = returncode
+        self.cmd = cmd
+        self.output = output
+        self.error = error
+    def __str__(self):
+        s = "Command failed with exit status {}:\n{}".format(self.returncode, self.cmd)
+        if self.output:
+            output = str(self.output, 'utf-8', 'ignore')
+            s += "\nstdout:\n{}\n".format(output)
+        if self.error:
+            error = str(self.error, 'utf-8', 'ignore')
+            s += "\nstderr:\n{}\n".format(error)
+        return s
+
+def poopen(args, env=None):
+    p = sp.Popen(args, stdout=sp.PIPE, stderr=sp.PIPE, env=env)
+    out, err = p.communicate()
+    if p.returncode != 0:
+        raise PoopenError(returncode=p.returncode, cmd=args, output=out, error=err)
+    return p.returncode, out, err