class/lib: Fix up various file access methods

There are various bits of cruft that have built up around our file accesses. This patch
cleans some of them up, specifically:

 * Remove pointless "from __builtin__ import file"
 * Use open(), not file()
 * Wrap file usage in a with container to ensure files are closed
 * Add missing .close() calls in some cases

(From OE-Core rev: a43e0a8ecd0441131e929daf998c3cd454d9c8f3)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/meta/lib/oe/utils.py b/meta/lib/oe/utils.py
index ec8260d9bd..0a2092b24b 100644
--- a/meta/lib/oe/utils.py
+++ b/meta/lib/oe/utils.py
@@ -7,11 +7,13 @@ except ImportError:
 
 def read_file(filename):
     try:
-        f = file( filename, "r" )
+        f = open( filename, "r" )
     except IOError as reason:
         return "" # WARNING: can't raise an error now because of the new RDEPENDS handling. This is a bit ugly. :M:
     else:
-        return f.read().strip()
+        data = f.read().strip()
+        f.close()
+        return data
     return None
 
 def ifelse(condition, iftrue = True, iffalse = False):