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The steps in do_kernel_checkout modify the source tree in WORKDIR. If it is called multiple times, or interrupted, the tree is left in an inconsistent state. This change adds protections around branch names, and around the manipulations of directories to ensure that it is safe to call at any point. (From OE-Core rev: f937977f241e786c5a7438449ed4c9da4c55829b) Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>