--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/treepkg/util.py	Tue Mar 06 17:37:32 2007 +0100
@@ -0,0 +1,73 @@
+# Copyright (C) 2007 by Intevation GmbH
+# Authors:
+# Bernhard Herzog <bh@intevation.de>
+#
+# This program is free software under the GPL (>=v2)
+# Read the file COPYING coming with the software for details.
+
+"""Collection of functions that didn't fit elsewhere"""
+
+import os
+import tempfile
+
+import run
+
+
+def extract_value_for_key(lines, key):
+    """Parses a sequence of strings for a key and returns the associated value
+
+    The function determines the first string in lines that starts with
+    key.  It returns the rest of the lines stripped of leading and
+    trailing whitespace.
+    """
+    for line in lines:
+        if line.startswith(key):
+            return line[len(key):].strip()
+
+def extract_lsm_version(lsm_file):
+    return extract_value_for_key(open(lsm_file), "Version:")
+
+def debian_changelog_version(changelog):
+    """Returns the newest version in a debian changelog."""
+    output = run.capture_output(["dpkg-parsechangelog",  "-l" + changelog])
+    return extract_value_for_key(output.splitlines(), "Version:")
+
+
+def ensure_directory(directory):
+    """Creates directory and all its parents.
+
+    Unlike os.makedirs, this function doesn't throw an exception
+    """
+    if not os.path.isdir(directory):
+        os.makedirs(directory)
+
+
+def writefile(filename, contents):
+    """Write contents to filename in an atomic way.
+
+    The contents are first written to a temporary file in the same
+    directory as filename.  Once the contents are written, the temporary
+    file is closed and renamed to filename.
+    """
+    dirname, basename = os.path.split(filename)
+    fileno, tempname = tempfile.mkstemp("", basename, dirname)
+    try:
+        os.write(fileno, contents)
+        if not contents.endswith("\n"):
+            os.write(fileno, "\n")
+        os.close(fileno)
+        os.rename(tempname, filename)
+    finally:
+        if os.path.exists(tempname):
+            os.remove(tempname)
+
+
+class StatusFile(object):
+
+    def __init__(self, filename):
+        assert os.path.isabs(filename)
+        self.filename = filename
+
+    def set(self, status, extra=""):
+        ensure_directory(os.path.dirname(self.filename))
+        writefile(self.filename, status + "\n" + extra)