oe.patch: don't error when the symlink already exists and is correct

Adds oe.path.symlink convenience function.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Chris Larson <chris_larson@mentor.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/oe/path.py b/lib/oe/path.py
index a145456659..f58c0138bb 100644
--- a/lib/oe/path.py
+++ b/lib/oe/path.py
@@ -53,3 +53,14 @@ def remove(path):
             shutil.rmtree(path)
         elif exc.errno != errno.ENOENT:
             raise
+
+def symlink(source, destination, force=False):
+    """Create a symbolic link"""
+    import os, errno
+    try:
+        if force:
+            remove(destination)
+        os.symlink(source, destination)
+    except OSError, e:
+        if e.errno != errno.EEXIST or os.readlink(destination) != source:
+            raise