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If we're upgrading a recipe that fetches from git, and we've simply fetched a tarball of the repo instead of directly from the upstream repo (this can happen if you have PREMIRRORS set up as in poky with a core recipe, e.g. kernelshark) then we won't have any new revisions, and the checkout will fail with "fatal: reference is not a tree: <hash>". To avoid this, do a "git fetch" before checking out the new revision. (From OE-Core rev: c4daebf3fe797a8063dcbc2ab229be2fbedc8134) Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>