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Many user/group operations will involve hashes which will include '$' followed by a number or even possibly an env. variable name. Passing $opts to flock requires that we take additional precautions to prevent the unexpected expansion of these instances. This was found by an image which used usermod operations to set the password hash for root. The image could not be logged-in to and examining /etc/shadow clearly showed that $0 and other $* variables had been expanded unexpectedly. This change returnes the behavior to what existed prior to commit 2ebf697b46c42cee8bfa6d2e6087397f8cce385c [useradd_base.bbclass: replace retry logic with flock]. (From OE-Core rev: d80065642c5a1c95a298b235a8d575460147ede1) Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>