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11dd6791c4
Factor out the repeated pattern of taking a lock, or immediately aborting with a message if it cannot be acquired. The exit code in that situation is changed to be exit code 1, rather than the successful 0; we are likely missing new work since that process started. We move the lockfiles to a common directory under `/srv/zulip-locks` rather than muddy up `/home/zulip/deployments`.