let's use sd_notifyf(). Let's also stop validating the session ID here.
This is the destructor. if it contains a dash, we are already too late
here anyway.
systemd-journal-remote always wrote the boot-id of the device it was running on
to the header of its journal files. When the source had a different boot-id
(because it was generated on a different boot, or a different device), the
boot-ids in the file were inconsistent. The _BOOT_ID field was that of the
source, but the journal file header and each entry object header were that of
the device systemd-journal-remote ran on. This breaks journalctl --list-boots
on any of these files.
Set the boot-id in the header to be that of the source. This also fixes the
entry object headers.
In particular, let's not use gotos that jump up, i.e. are loops. gotos
that jump down for the purpose of clean-up are cool, but using them for
loops is evil.
No change in behaviour, just some refactoring.
It's not easy to implement such a combined operation race-freely since
dropping a subvolume will drop all its contents, including any
non-directories.
Hence, let's just not support this combination for now. Which isn't much
of a loss, since we never combine these flags anyway.
