wic: Refactor getting bitbake variables

Wic gets bitbake variables by parsing output of 'bitbake -e' command.

This implementation improves this procedure as it runs 'bitbake -e' only
when API is called and does it only once, i.e. in a "lazy" way. As parsing
results are cached 'bitbake -e' is run only once and results are parsed
only once per requested set of variables.

get_bitbake_var became the only API call. It replaces find_artifacts,
find_artifact, find_bitbake_env_lines, get_bitbake_env_lines,
set_bitbake_env_lines and get_line_val calls making API much more clear.

(From OE-Core rev: 3abe23bd217315246ec2d98dc9c390b85cfe6a92)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 7 deletions

diff --git a/scripts/lib/wic/plugins/source/rootfs.py b/scripts/lib/wic/plugins/source/rootfs.py
index 12fbf67a6e..a90712b247 100644
--- a/scripts/lib/wic/plugins/source/rootfs.py
+++ b/scripts/lib/wic/plugins/source/rootfs.py
@@ -29,7 +29,7 @@ import os
 
 from wic import msger
 from wic.pluginbase import SourcePlugin
-from wic.utils.oe.misc import find_bitbake_env_lines, find_artifact
+from wic.utils.oe.misc import get_bitbake_var
 
 class RootfsPlugin(SourcePlugin):
     """
@@ -43,12 +43,7 @@ class RootfsPlugin(SourcePlugin):
         if os.path.isdir(rootfs_dir):
             return rootfs_dir
 
-        bitbake_env_lines = find_bitbake_env_lines(rootfs_dir)
-        if not bitbake_env_lines:
-            msg = "Couldn't get bitbake environment, exiting."
-            msger.error(msg)
-
-        image_rootfs_dir = find_artifact(bitbake_env_lines, "IMAGE_ROOTFS")
+        image_rootfs_dir = get_bitbake_var("IMAGE_ROOTFS", rootfs_dir)
         if not os.path.isdir(image_rootfs_dir):
             msg = "No valid artifact IMAGE_ROOTFS from image named"
             msg += " %s has been found at %s, exiting.\n" % \