* apt/progress/__init__.py:

  - Fix InstallProgress.updateInterface() to cope with read() returning 0
    on non-blocking file descriptors (LP: #491027).

* apt/cache.py: 
  - improved docstring for the cache
  - add "enhances" property
* data/templates/Ubuntu.info.in:
  - add lucid
* python/cache.cc:
  - add UntranslatedDepType attribute to DependencyType
  - add DepTypeEnum that returns a value from 
    {DepDepends, DepPreDepends, ...}
* python/apt_pkgmodule.cc:
  - add DepDpkgBreaks, DepEnhances constants
* doc/source/apt_pkg/{cache.rst, index.rst}:
  - update documentation as well

3 files changed, 17 insertions, 2 deletions

diff --git a/apt/cache.py b/apt/cache.py
index fa6c404c..ae6f2fcc 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -43,7 +43,14 @@ class Cache(object):
     """Dictionary-like package cache.
 
     This class has all the packages that are available in it's
-    dictionary
+    dictionary. 
+
+    Keyword arguments:
+    progress -- a OpProgress object
+    rootdir -- a alternative root directory. if that is given 
+               the system sources.list and system lists/ files are 
+               not read, only files relative to the given rootdir
+    memonly -- build the cache in memory only
     """
 
     def __init__(self, progress=None, rootdir=None, memonly=False):
diff --git a/apt/package.py b/apt/package.py
index 8d3be1b0..f33871c6 100644
--- a/apt/package.py
+++ b/apt/package.py
@@ -379,6 +379,11 @@ class Version(object):
         return depends_list
 
     @property
+    def enhances(self):
+        """Return the list of enhances for the package version."""
+        return self.get_dependencies("Enhances")
+
+    @property
     def dependencies(self):
         """Return the dependencies of the package version."""
         return self.get_dependencies("PreDepends", "Depends")
diff --git a/apt/progress/__init__.py b/apt/progress/__init__.py
index 8a9eb86f..8694de77 100644
--- a/apt/progress/__init__.py
+++ b/apt/progress/__init__.py
@@ -246,7 +246,10 @@ class InstallProgress(DumbInstallProgress):
             return
         try:
             while not self.read.endswith("\n"):
-                self.read += os.read(self.statusfd.fileno(), 1)
+                r = os.read(self.statusfd.fileno(), 1)
+                if not r:
+                    return
+                self.read += r
         except OSError, (errno_, errstr):
             # resource temporarly unavailable is ignored
             if errno_ != errno.EAGAIN and errno_ != errno.EWOULDBLOCK: