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CHANGE OF BEHAVIOUR — with this commit "f" line's behaviour is altered to match what the documentation says: if an "argument" string is specified it is written to the file only when the file didn't exist before. Previously, it would be appended to the file each time systemd-tmpfiles was invoked — which is not a particularly useful behaviour as the tool is not idempotent then and the indicated files grow without bounds each time the tool is invoked. I did some spelunking whether this change in behaviour would break things, but afaics nothing relies on the previous O_APPEND behaviour of this line type, hence I think it's relatively safe to make "f" lines work the way the docs say, rather than adding a new modifier for it or so. Triggered by: https://lists.freedesktop.org/archives/systemd-devel/2018-January/040171.html
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