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As documented in /meson.build where the variable is defined,
meson.build_root() doesn't work as expected with project nesting. I have
no idea why anyone would want to embed systemd in another meson project,
but let's use the variable if we have it.
Ubuntu Bionic 18.04 has 0.45, so it was below the previously required
minimum version already. Focal 20.04 has 0.53.2. Let's require that
and use various features that are available.
This header provides definitions for NET_NAME_UNKNOWN ånd NET_NAME_ENUM
Fixes build issue found with non-glibc systems
../git/src/network/networkd-link.c:1203:52: error: 'NET_NAME_UNKNOWN' undeclared (first use in this function)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
From #20300:
> commit 70f32a260b
> Author: Yu Watanabe <watanabe.yu+github@gmail.com>
> Date: Sun May 23 16:59:40 2021 +0900
> udev/net: do not manage loopback interfaces
> There are nothing we can configure in udevd for loopback interfaces;
> no ethertool configs can be applied, MAC address, interface name should
> introduced a regression for 'udevadm test-builtin net_setup_link /sys/class/net/lo/'.
> Prior to this commit this command would exit with 0 whereas after this commit
> it exists with 1. This causes cloud-init on Archlinux to fail as this command
> is run by it and likely also netplan to have networkd rescan and re-apply a
> bunch of things on NICs.
I think it's reasonable to keep returning 0 here: we are intentatinally doing
nothing for the device, and that is not an error, but a (noop) success.
Fixes#20300.
Add support for systemd-tpm2 based LUKS2 device activation
via libcryptsetup plugin. This make the feature (tpm2 sealed
LUKS2 keyslot passphrase) usable from both systemd utilities
and cryptsetup cli.
The feature is configured via -Dlibcryptsetup-plugins combo
with default value set to 'auto'. It get's enabled automatically
when cryptsetup 2.4.0 or later is installed in build system.
This is not called from the systemd.triggers or systemd.macros files. Instead,
it would be called from the scriptlets in systemd rpm package itself, at the
place where we call systemctl daemon-reexec.
See https://github.com/systemd/systemd/pull/20289#issuecomment-885622200 .
This closes an important gap: so far we would reexecute the system manager and
restart system services that were configured to do so, but we wouldn't do the
same for user managers or user services.
The scheme used for user managers is very similar to the system one, except
that there can be multiple user managers running, so we query the system
manager to get a list of them, and then tell each one to do the equivalent
operations: daemon-reload, disable --now, set-property Markers=+needs-restart,
reload-or-restart --marked.
The total time that can be spend on this is bounded: we execute the commands in
parallel over user managers and units, and additionally set SYSTEMD_BUS_TIMEOUT
to a lower value (15 s by default). User managers should not have too many
units running, and they should be able to do all those operations very
quickly (<< 1s). The final restart operation may take longer, but it's done
asynchronously, so we only wait for the queuing to happen.
The advantage of doing this synchronously is that we can wait for each step to
happen, and for example daemon-reloads can finish before we execute the service
restarts, etc. We can also order various steps wrt. to the phases in the rpm
transaction.
When this was initially proposed, we discussed a more relaxed scheme with bus
property notifications. Such an approach would be more complex because a bunch
of infrastructure would have to be added to system manager to propagate
appropriate notifications to the user managers, and then the user managers
would have to wait for them. Instead, now there is no new code in the managers,
all new functionality is contained in src/rpm/. The ability to call 'systemctl
--user user@' makes this approach very easy. Also, it would be very hard to
order the user manager steps and the rpm transaction steps.
Note: 'systemctl --user disable' is only called for a user managers that are
running. I don't see a nice way around this, and it shouldn't matter too much:
we'll just leave a dangling symlink in the case where the user enabled the
service manually.
A follow-up for https://bugzilla.redhat.com/show_bug.cgi?id=1792468 and
fa97d2fcf6.
Some rpms install a bunch of units… It seems nicer to invoke them all in
parallel. In particular, timeouts in systemctl also run in parallel, so if
there's some communication mishap, we will wait less.
Instead of embedding the commands to invoke directly in the macros,
let's use a helper script as indirection. This has a couple of advantages:
- the macro language is awkward, we need to suffix most commands by "|| :"
and "\", which is easy to get wrong. In the new scheme, the macro becomes
a single simple command.
- in the script we can use normal syntax highlighting, shellcheck, etc.
- it's also easier to test the invoked commands by invoking the helper
manually.
- most importantly, the logic is contained in the helper, i.e. we can
update systemd rpm and everything uses the new helper. Before, we would
have to rebuild all packages to update the macro definition.
This raises the question whether it makes sense to use the lua scriptlets when
the real work is done in a bash script. I think it's OK: we still have the
efficient lua scripts that do the short scripts, and we use a single shared
implementation in bash to do the more complex stuff.
The meson version is raised to 0.47 because that's needed for install_mode.
We were planning to raise the required version anyway…
Even though it's just a fallback path, let's not be sloppy and allocate in
the crash handler.
> The deadlock happens because systemd crash in malloc() then in signal
> handler, it calls malloc() (close_all_fds()-> opendir()-> __alloc_dir())
> again. malloc() is not a signal-safe function, maybe we should re-think
> the logic here.
Fixes#20266.
Library code should not call freeze(), this is something that should
only be done by "application code", so moving it into shared/ is appropriate.
The fallback to call _exit() is dropped: let's trust that the infinite loop
is infinite.
Currently it's only used in two places in src/shared/, so the function was
already included just once in compiled code. But it seems appropriate to
move it there anyway, because library code should have no need to fork
agents, so it doesn't belong in basic/.
We need a sorted list of fds to skip over when closing. We would allocate a
copy of the passed array to do the sort. But all callers construct a temporary
array to pass to us, so it is pointless to copy it again.
close_all_fds/safe_fork_full/namespace_fork/fork_agent are changed to pass
a non-const int array. I checked all users, and all callers are fine with
the array being sorted.
The function was returning some number (sometimes 1, sometimes the extent
of the range passed over to close_range(), ???). Anyway, all callers only
check for error, so let's return 0 on success.
nss-resolve also looks in /etc/hosts, and has the same local hostname
resolving logic as nss-myhostname. We shouldn't recommend another order
than nss-resolve uses internally.
When nss-resolve is used, there's no possibility to override
nss-myhostname hosts via DNS *anyway*.
On top of that, it's not a good idea to allow DNS to override local
hostnames as all - at least not something we should advertise in the
docs.
Followup of f918c67d38ba6ccd4eb0dc657f3f3155e5010cae /
https://github.com/systemd/systemd/pull/16754.
When we reexec the manager in a container, we lose configuration settings on
the kernel command line:
$ systemd-nspawn -M rawhide -b systemd.status-unit-format=name systemd.show-status=yes
...
# tr '\0' ' ' </proc/1/cmdline
/usr/lib/systemd/systemd systemd.status_unit_format=combined systemd.show-status=yes
# sudo systemctl daemon-reexec
# tr '\0' ' ' </proc/1/cmdline
/usr/lib/systemd/systemd --system --deserialize 20
This means that after daemon-reexec, the settings that we gain from the
commandline are reset to defaults.
So let's reeexecute with the original arguments copied over, modulo some
filtering.
This moves the /var/log/README content out of /var and into the
docs location, replacing the previous file with a symlink
created through a tmpfiles.d entry.
When two fields were added to the vtable.x.start struct, no initializers
for these were added to SD_BUS_VTABLE_END which also (ab)used that
struct (albeit sneakily by using non-designated initialization).
While C tolerates this, C++ prohibits these missing initializers, and
both g++ and clang++ will complain when using -Wextra.
This patch gives SD_BUS_VTABLE_END its own case in the union and
clarifies its initialization.
I tested the behaviour of g++ 10.2 and clang 11 in various cases. Both will warn
(-Wmissing-field-initializers, implied by -Wextra) if you provide initializers for some
but not all fields of a struct. Declaring x.end as empty struct or using an empty initializer
{} to initialize the union or one of its members is valid C++ but not C, although both gcc
and clang accept it without warning (even at -Wall -Wextra -std=c90/c++11) unless you
use -pedantic (which requires -std=c99/c++2a to support designated initializers).
Interestingly, .x = { .start = { 0, 0, NULL } } is the only initializer I found for the union
(among candidates for SD_BUS_VTABLE_END) where gcc doesn't zero-fill it entirely
when allocated on stack, it looked like it did in all other cases (I only examined this on
32-bit arm). clang always seems to initialize all bytes of the union.
[zjs: test case:
$ cat vtable-test.cc
#include "sd-bus.h"
const sd_bus_vtable vtable[] = {
SD_BUS_VTABLE_END
};
$ g++ -I src/systemd/ -Wall -Wmissing-field-initializers -c vtable-test.cc
vtable-test.cc:5:1: warning: missing initializer for member ‘sd_bus_vtable::<unnamed union>::<unnamed struct>::features’ [-Wmissing-field-initializers]
5 | };
| ^
vtable-test.cc:5:1: warning: missing initializer for member ‘sd_bus_vtable::<unnamed union>::<unnamed struct>::vtable_format_reference’ [-Wmissing-field-initializers]
$ clang++ -I src/systemd/ -Wmissing-field-initializers -c vtable-test.cc
vtable-test.cc:4:4: warning: missing field 'features' initializer [-Wmissing-field-initializers]
SD_BUS_VTABLE_END
^
src/systemd/sd-bus-vtable.h:188:28: note: expanded from macro 'SD_BUS_VTABLE_END'
.x = { { 0 } }, \
^
1 warning generated.
Both warnings are gone with the patch.]
We can make things a bit simpler and more readable by not specifying the path.
Since we didn't specify the full path for all commands (including those invoked
recursively by anythign we invoke), this didn't really privide any security or
robustness benefits. I guess that full paths were used because this style of
rpm packagnig was popular in the past, with macros used for everything
possible, with special macros for common commands like %{__ln} and %{__mkdir}.
We would copy "forever" into the buffer. This is a fairly common case, so let's
do a microoptimization and return a static string. (All callers use the return
pointer, so this works just as well.)
The prefix "for " was not displayed, because the pointer to the part of the
buffer after "for " was returned. (Maybe it's just me, but I find strpcpy()
and associated functions really hard to use… I always have to look up what the
do exactly and what the return value is.)
A simple test is added.
When assigning the same address provided by a dynamic addressing
protocol, the new lifetime is stored on Request::Address, but not
Address object in Link object, which can be obtained by address_get().
So, we need to configure address with Address object in Request.
Fixes#20245.
