[PATCH] qemuboot: don't fail when QB_DEFAULT_KERNEL isn't symlink

[Martin Jansa <martin.jansa@gmail.com>]

* in some cases we might set QB_DEFAULT_KERNEL to the real filename
  instead of symlink and then this whole readlink work around actually
  breaks the build, because os.readlink fails on normal files:

  >>> os.readlink('deploy/images/qemux86/bzImage-linux-yocto-qemux86-master-20160927084848.bin')
  'bzImage-linux-yocto-qemux86.bin'
  >>> os.readlink('deploy/images/qemux86/bzImage-linux-yocto-qemux86.bin')
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  OSError: [Errno 22] Invalid argument: '/jenkins/mjansa/build-starfish-master-mcf/BUILD/deploy/images/qemux86/bzImage-linux-yocto-qemux86.bin'

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 meta/classes/qemuboot.bbclass | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/meta/classes/qemuboot.bbclass b/meta/classes/qemuboot.bbclass
index 97a2357..a3a05ba 100644
--- a/meta/classes/qemuboot.bbclass
+++ b/meta/classes/qemuboot.bbclass
@@ -69,7 +69,11 @@ python write_qemuboot_conf() {
     # to the kernel file, which hinders relocatability of the qb conf.
     # Read the link and replace it with the full filename of the target.
     kernel_link = os.path.join(d.getVar('DEPLOY_DIR_IMAGE', True), d.getVar('QB_DEFAULT_KERNEL', True))
-    kernel = os.readlink(kernel_link)
+    try:
+        kernel = os.readlink(kernel_link)
+    except OSError as e:
+        # we assume it failed, because QB_DEFAULT_KERNEL is already real file or hardlink, not symlink
+        kernel = kernel_link
     cf.set('config_bsp', 'QB_DEFAULT_KERNEL', kernel)
 
     bb.utils.mkdirhier(os.path.dirname(qemuboot))
-- 
2.10.0