setup: make find_trial self-contained so that we don't have a bootstrapping problem -- if allmydata can't be imported we still want to be able to run find_trial

misc/find_trial.py

@@ -1,9 +1,36 @@
 import sys
 
-from allmydata.util import find_exe
+import os, sys
+from twisted.python.procutils import which
+
+def find_exe(exename):
+    """
+    Look for something named exename or exename + ".py".
+
+    This is a kludge.
+
+    @return: a list containing one element which is the path to the exename
+        (if it is thought to be executable), or else the first element being
+        sys.executable and the second element being the path to the
+        exename + ".py", or else return False if one can't be found
+    """
+    exes = which(exename)
+    exe = exes and exes[0]
+    if not exe:
+        exe = os.path.join(sys.prefix, 'scripts', exename + '.py')
+    if os.path.exists(exe):
+        path, ext = os.path.splitext(exe)
+        if ext.lower() in [".exe", ".bat",]:
+            cmd = [exe,]
+        else:
+            cmd = [sys.executable, exe,]
+        return cmd
+    else:
+        return False
+
 
 if __name__ == "__main__":
-    cmd = find_exe.find_exe("trial")
+    cmd = find_exe("trial")
     if cmd:
         print " ".join(cmd).replace("\\", "/")
     else: