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"Notifications are of informal nature and no reply is expected, therefore the
sequence number is typically set to 0."[1]
If networkd is started soon after recent netlink activity, then there
will be messages with sequence number 0 in the buffer.
The first thing networkd does is to request a dump of all the links. If
it uses sequence number 0 for this, then it may confuse the dump request's
response with that of a notification.
This will result in it failing to properly enumerate all the links,
but more importantly, when it comes to enumerate all the addresses, it
will still have the link dump in progress, so the address enumeration
will fail with -EBUSY.
[1]: http://www.infradead.org/~tgr/libnl/doc/core.html#core_msg_types
[tomegun: sequence -> serial]
The information in the db is stale, so it does not make sense to
expose it any longer. Also, don't drop the kernel event, but simply
pass it on to userspace without ammending it.
We were explicitly eagerly loading the db, then deletenig the backing file and then processing the
rules/symlinks. Instead we delete the backnig db file as the last step and let the db loading be
lazy as everywhere else.
This may save us a bit of work in casese where the db is not needed, but more importantly it hides
some implementation details of libudev-device form udevd.
On kdbus, we get cgroups-agent messages via the system bus, not the
private systemd socket. Therefore, we must install the match properly or
we will never receive cgroup notifications.
Forwarding messages that are not rewinded will drop data. Fix this for
cgroups-agent messages that we might remarshal before forwarding to the
system bus.
If we receive an sd_bus_message from the kernel, m->kdbus will contain
additional items that cannot be used when sending a message. Therefore,
always remarshal the message if it is used again.
If the local peer does not dispatch its incoming queue, the bus-proxy will
slowly fill its outgoing queue. Once its full, it will continously
complain that it cannot forward its messages.
As it turns out, pulseaudio does have an idle background dbus connection
that is not integrated into any mainloop (and given that gdbus and
libdbus1 both support background shared connections, PA is probably not
the only example), therefore, the bus-proxy will loudly complain if it
cannot forward NameOwnerChanged events once the queue is full.
This commit makes the proxy track queue-state and complain only once the
queue runs full, not if it is already full.
A PA bug-report (and patch) has been filed, and other applications should
be fixed similarly. Hence, lets keep the error message, instead of
dropping it. It's unused resources we really want to get rid of, so
silencing the message does not really help (which is actually what
dbus-daemon does).
This introduces a new SYSVIEW_EVENT_SETTLE notification that is sent after
initial scanning via sysview is done. This is very handy to let the
application raise warnings in case requested resources are not found
during startup.
The SETTLE event is sent after systemd-logind and udev enumerations are
done. This event does in no way guarantee that a given resource is
available. All it does is notify the application that scanning is done!
You must not react to SETTLE if you don't have external synchronization
with the resource you're waiting for.
The main use-case for SETTLE is to run applications _inside_ of logind
sessions and startup sysview. You really want to make sure that the own
session you're running in was found during enumeration. If not, something
is seriously wrong.
The error-code propagated via sysview is always negative. Avoid
multiplying by -1 before returning it. Otherwise, we will return >0
instead of <0, which will not be detected as error by sysview-core.
renameat2() exists since Linux 3.15 but btrfs support for the flag
RENAME_NOREPLACE was added later.
This patch implements a fallback when renameat2() returns EINVAL.
EINVAL is the error returned when the filesystem does not support one of
the flags.
path_is_mount_point() compares the mount_id of a directory and the
mount_id of the parent directory. When following symlinks, the function
to get the parent directory does not take the symlink into account.
/bin -> /usr/bin with /usr being a mountpoint:
mount_id of /bin with AT_SYMLINK_FOLLOW != mount_id of /
GetConnectionCredentials method was added to dbus-1 specification
more than one year ago. This method should return "[...] as many
credentials as possible for the process connected to the server",
but at this moment only "UnixUserID", "LinuxSecurityLabel" and
"ProcessID" are defined by the specification. We should add support
for next credentials after extending dbus-1 spec.
Avoid double logs printing. Not that we don't return
manager_update_global_progress() to the handler callback as if the console or
plymouth isn't available momentarily, we still desire to handle future
fd progress events if those are available again (like cancellation, reports…)
Usually when using loop_read(), we want to read the full buffer.
Add a helper that mirrors loop_write(), and returns 0 when full buffer
was read, and an error otherwise.
Use -ENODATA for the short read, to distinguish it from a read error.
Properties should only be saved to the db when added to the udev_device by udevd, and only if
the property does not start with a '.'. Make this implicit rather than expose the marking of
properties.
This essentially replaces
open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444)
with
open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644),
which is ok for our purposes.
