Rename glider to thandy, based on discussions on #nottor. Please let me know ASAP if there is another program Thandy, or if it means something rude, or whatever.

git-svn-id: file:///home/or/svnrepo/updater/trunk@17085 55e972cd-5a19-0410-ae62-a4d7a52db4cd

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/thandy/util.py b/lib/thandy/util.py
new file mode 100644
index 0000000..e87ed8b
--- /dev/null
+++ b/lib/thandy/util.py
@@ -0,0 +1,73 @@
+
+import os
+import sys
+import tempfile
+
+import simplejson
+
+import thandy.formats
+import thandy.keys
+import thandy.master_keys
+
+def moveFile(fromLocation, toLocation):
+    if sys.platform in ('cygwin', 'win32'):
+        # Win32 doesn't let rename replace an existing file.
+        try:
+            os.unlink(toLocation)
+        except OSError:
+            pass
+    os.rename(fromLocation, toLocation)
+
+
+def replaceFile(fname, contents, textMode=False):
+    """overwrite the file in 'fname' atomically with the content of 'contents'
+    """
+    dir, prefix = os.path.split(fname)
+    fd, fname_tmp = tempfile.mkstemp(prefix=prefix, dir=dir, text=textMode)
+
+    try:
+        os.write(fd, contents)
+    finally:
+        os.close(fd)
+
+    moveFile(fname_tmp, fname)
+
+def userFilename(name):
+    try:
+        base = os.environ["THANDY_HOME"]
+    except KeyError:
+        base = "~/.thandy"
+    base = os.path.expanduser(base)
+    if not os.path.exists(base):
+        os.makedirs(base, 0700)
+    return os.path.join(base, name)
+
+def getKeylist(keys_fname, checkKeys=True):
+    import thandy.master_keys
+
+    keydb = thandy.formats.Keylist()
+
+    for key in thandy.master_keys.MASTER_KEYS:
+        keydb.addKey(key)
+
+    user_keys = userFilename("preload_keys")
+    if os.path.exists(user_keys):
+        #XXXX somewhat roundabout.
+        keylist = thandy.formats.makeKeylistObj(user_keys)
+        keydb.addFromKeylist(keylist, allowMasterKeys=True)
+
+    if keys_fname and os.path.exists(keys_fname):
+        f = open(keys_fname, 'r')
+        try:
+            obj = simplejson.load(f)
+        finally:
+            f.close()
+        ss, role, path = thandy.formats.checkSignedObj(obj, keydb)
+        if role != 'master':
+            raise thandy.FormatException("%s wasn't a keylist."%keys_fname)
+        if checkKeys and not ss.isValid():
+            raise thandy.FormatException("%s not signed by enough master keys"%
+                                         keys_fname)
+        keydb.addFromKeylist(obj['signed'], allowMasterKeys=False)
+
+    return keydb