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Lennart Poettering
adf47c919a
log: add new "prohibit_ipc" flag to logging system
If set, we'll avoid logging to any IPC log targets, i.e. syslog or the journal, but allow stderr, kmsg, console logging. This is useful as PID 1 wants to turn this off explicitly as long as the journal is not up. Previously we'd open/close the log stream to these services whenever needed but this is incompatible with the "open_when_needed" logic introduced in #6915, which might open the log streams whenever it likes, including possibly inside of the child process we fork off that'll become journald later on. Hence, let's make this all explicit, and instead of managing when we open/close log streams add a boolean that clearly prohibits the IPC targets when needed, so that opening can be done at any time, but will honour this. See: #7985
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