well, this is what works for me
def write_deploy_lock(deploy_lock)
put deploy_lock.to_yaml, deploy_lockfile, :mode => 0777
# Ensure the lockfile is removed on failure
at_exit { exit_cleanup('exception on exit') if $! }
trap('INT') { exit_cleanup('interrupt'); exit 1 }
on_rollback { exit_cleanup('rollback') }
end
def exit_cleanup(reason)
if @already_removed_lock
logger.info "[#{reason}] already removed lock"
else
logger.important "[#{reason}] Deploy failure, removing lockfile"
remove_deploy_lock
@already_removed_lock = true
end
end
def remove_deploy_lock
run "rm -f #{deploy_lockfile}"
end
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