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Inheriting image-buildinfo.bbclass primarily slowed down image building for two reasons: 1. The content of the shell command "buildinfo" gets expanded multiple times, each time again checking the state of all layers. 2. When expanded as part of the actual image creation, git is invoked under pseudo, which makes the check quite a bit slower (from a few seconds to a minute with many layers). To fix this, buildinfo now is a Python method which calls the checks only when really executed. Pseudo is told to unload itself when starting git. In addition, "git diff" is invoked with "--quiet", which avoids producing output that is just getting thrown away. As before, any kind of problem or output causes the layer to be marked as "modified". [Revision 2 of the change with some dead code removed] (From OE-Core rev: e59547e4154b772a36f4e58f1d454c0c38653c84) Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>