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, 1 insertions, 5 deletions

diff --git a/scripts/lib/wic/plugins/source/rootfs_pcbios_ext.py b/scripts/lib/wic/plugins/source/rootfs_pcbios_ext.py
index 533eaa7bd1..76e7b033fb 100644
--- a/scripts/lib/wic/plugins/source/rootfs_pcbios_ext.py
+++ b/scripts/lib/wic/plugins/source/rootfs_pcbios_ext.py
@@ -59,11 +59,7 @@ class RootfsPlugin(SourcePlugin):
         if os.path.isdir(rootfs_dir):
             return rootfs_dir
 
-        bitbake_env_lines = misc.find_bitbake_env_lines(rootfs_dir)
-        if not bitbake_env_lines:
-            msger.error("Couldn't get bitbake environment, exiting.")
-
-        image_rootfs_dir = misc.find_artifact(bitbake_env_lines, "IMAGE_ROOTFS")
+        image_rootfs_dir = misc.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" % \