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let's make sure we log about every failure
Also, complain about systems where /dev/tty0 exists but
/sys/class/tty/tty0/active does not. Such systems (usually container
environments) are pretty broken as they mount something that is not a VC
to /dev/tty0 and they really shouldn't.
Systems should either have a VC or not, but not badly fake one by
mounting things wildly.
This just adds a warning message, as before we'll simply turn off VC
handling in this case.
Let's not use the word "wrapper", as it's not clear what that is, and in
some way any unit file is a "wrapper"... let's simply say that it's
about the runtime directory.
Previously this was serialized as part of the user object. This didn't
work however, as we load users first, and sessions seconds and hence
referencing a session from the user load logic cannot work.
Fix this by storing an IS_DISPLAY property along with each session, and
make the session with this set display session when it is loaded.
Let's update things a bit to follow current practices:
- User structure initialization rather than zero-initialized allocation
- Always propagate proper errors from allocation functions
- Use _cleanup_ for freeing objects when allocation fails half-way
- Make destructors return NULL
The term “positive” is often read to exclude 0 (though “strictly
positive” is sometimes used to clarify this), so let’s explicitly state
that --lines=0 is legal and completely disables journal output.
Motivated by an answer on StackExchange [1].
[1]: https://unix.stackexchange.com/a/475068/44049
This is actually a u16, not a u32, so the kernel complains:
kernel: netlink: 'systemd-network': attribute type 5 has an invalid length
This is due to:
if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) {
pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n",
current->comm, type);
}
Presumably this has been working fine in functionality on little-endian
systems, but nobody bothered to try on big-endian systems.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
