1 files changed, 67 insertions, 0 deletions
diff --git a/build/generator/util/executable.py b/build/generator/util/executable.py
new file mode 100644
index 0000000..f04f6d2
--- /dev/null
+++ b/build/generator/util/executable.py
@@ -0,0 +1,67 @@
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+#
+#
+# executable.py -- Utilities for dealing with external executables
+#
+
+import os
+import subprocess
+
+def exists(file):
+  """Is this an executable file?"""
+  return os.path.isfile(file) and os.access(file, os.X_OK)
+
+def find(file, dirs=None):
+  """Search for an executable in a given list of directories.
+     If no directories are given, search according to the PATH
+     environment variable."""
+  if not dirs:
+    dirs = os.environ["PATH"].split(os.pathsep)
+  for path in dirs:
+    if is_executable(os.path.join(path, file)):
+      return os.path.join(path, file)
+    elif is_executable(os.path.join(path, "%s.exe" % file)):
+      return os.path.join(path, "%s.exe" % file)
+  return None
+
+def output(cmd, strip=None):
+  """Run a command and collect all output"""
+  # Check that cmd is in PATH (otherwise we'd get a generic OSError later)
+  import distutils.spawn
+  if isinstance(cmd, str):
+    cmdname = cmd
+  elif isinstance(cmd, list):
+    cmdname = cmd[0]
+  if distutils.spawn.find_executable(cmdname) is None:
+    return None
+
+  # Run it
+  (output, empty_stderr) = subprocess.Popen(cmd, stdout=subprocess.PIPE, \
+                             stderr=subprocess.STDOUT).communicate()
+  if strip:
+    return output.strip()
+  else:
+    return output
+
+def run(cmd):
+  """Run a command"""
+  exit_code = os.system(cmd)
+  assert(not exit_code)