This is supposed to be used by package/image builders such as mkosi to
speed up building, since it allows us to suppress sync() inside a
container.
This does what Debian's eatmydata tool does, but for a container, and
via seccomp (instead of LD_PRELOAD).
The whole reason loop_device_make_internal() exists (as opposed to just
loop_device_make()) is to avoid mangling the loop flags value/call
getenv twice. Hence let's actually call it when we already mangled the
flags value.
When Assign= in [DHCPv6PrefixDelegation] is enabled, then the kernel
will create the prefix route for the assigned address with metric 256.
When Assign= is disabled, then the kernel will create the route with
metric 1024.
For the default value, we should choose a smaller value (higher priority)
than 1024, as the unreachable routes for delegated prefix will be
configured with 1024.
For static IPv6 routes without metric is specified, then we use 1024.
But such an adjustment is not performed to dynamic routes. So, let's
specify the metric explicitly.
Otherwise, configured routes will be handled as foreign.
Note that the kernel (at least 5.14.11) seems not to support lifetime
for IPv6 unreachable routes. The lifetime for routes of the type will be
handled by sd-event's timer event source.
So, we cannot confirm the lifetime with 'ip route' command.
Even in newer kernel version, it seems that some route type does not
support expiration, e.g. IPv4 route or unreachable route. Let's use
timer event source for such routes.
utmp(5) says `ut_line` is the device name minus the leading "/dev/". Therefore,
remove it. Without that, when using UtmpMode=user, we get `/dev/tty` in the
output of `last`/`w`.
Getting the variable directly from pkg-config (without
adding the sysroot prefix) is prone to host contamination
when building in sysroots as the compiler starts looking for the
headers on the host in addition to the sysroot.
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Previously in most cases we'd allocate the HomeSetup context object
in generic code in homework.c. But for some cases we allocated them
instead inside the specific code in homework-{cifs,directory,luks}.c
Let's clean that up, and systematically allocate it in the outer
"entrypoint" calls in homework.c instead of the inner ones.
This doesn't change much in behaviour (i.e. it just means when something
fails we'll now clean it up one stack frame further up). But it will
allow is to more easily work with the context objects, since we'll have
them around in all stack frames.
When a system has thousands of downstream interfaces, previously the
total cost of finding free subnet ID was O(n^2), where n is the number
of downstream interfaces.
This makes assigned prefixes are managed by Manager with Hashmap. So,
the cost becomes O(n log n).
Yu Watanabe
Luca Boccassi
Dimitri Papadopoulos
Lennart Poettering
Daan De Meyer
Zbigniew Jędrzejewski-Szmek
Vincent Bernat
Alexander Kanavin