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Add a simple check on the number of unit files that were found: return
`-ENOENT` when none is found from the function and thus `systemctl`
consequently exits with `1` (`EXIT_FAILURE`) if none were found.
Verification:
```bash
root@image:~# systemctl list-unit-files dbus-nonexistant.service; echo
$?
UNIT FILE STATE VENDOR PRESET
0 unit files listed.
1
root@image:~# systemctl list-unit-files dbus.service; echo $?
UNIT FILE STATE VENDOR PRESET
dbus.service static enabled
1 unit files listed.
0
```
Fixes#15082.
A common pattern in the codebase is reading a cgroup memory value
and converting it to a uint64_t. Let's make it a helper and refactor a
few places to use it so it's more concise.
Commit 08c588d18b moved attachment of the
sd-event into creation of the dhcp_client or ipv4ll in dhcp4_configure()
or ipv4ll_configure(), but these can also be created in link_load(),
so that creation needs to also perform sd-event attachment.
Without this, dhcp_client or ipv4ll created in link_load() will not have
an ->event and will fail assertion, causing networkd to fail, e.g.:
Assertion 'client->event' failed at src/libsystemd-network/sd-dhcp-client.c:1283, function client_start_delayed(). Ignoring.
ens2: Could not acquire DHCPv4 lease: Invalid argument
ens2: Failed
This may be not a popular setup, but in case kexec resides somewhere different
than the default location for KEXEC (`/usr/sbin/kexec`), don't just reboot and
try doing `reboot(RB_KEXEC)` instead, just like what `kexec -e` normally does.
```
❯ build/networkctl status veth99 ─╯
● 17: veth99
Link File: /usr/lib/systemd/network/99-default.link
Network File: /usr/lib/systemd/network/veth99.network
Type: ether
State: routable (configured)
Driver: veth
HW Address: 1e:04:f8:b8:2f:d4
MTU: 1500 (min: 68, max: 65535)
QDisc: noqueue
IPv6 Address Generation Mode: eui64
Queue Length (Tx/Rx): 1/1
Auto negotiation: no
Speed: 10Gbps
Duplex: full
Port: tp
Address: 192.168.5.35 (DHCP4)
fe80::1c04:f8ff:feb8:2fd4
Gateway: 192.168.5.1
DNS: 192.168.5.1
NTP: 192.168.5.1
SIP: 192.168.5.4
192.168.5.5
Time Zone: Europe/Berlin
Mar 21 23:26:32 Zeus systemd-networkd[671]: veth99: Link DOWN
Mar 21 23:26:32 Zeus systemd-networkd[671]: veth99: Lost carrier
Mar 22 10:25:35 Zeus systemd-networkd[671]: veth99: Link UP
Mar 22 10:25:35 Zeus systemd-networkd[671]: veth99: Gained carrier
Mar 22 10:25:36 Zeus systemd-networkd[671]: veth99: Gained IPv6LL
Mar 22 10:29:02 Zeus systemd-networkd[671]: veth99: Link DOWN
Mar 22 10:29:02 Zeus systemd-networkd[671]: veth99: Lost carrier
Mar 22 10:29:13 Zeus systemd-networkd[671]: veth99: Link UP
Mar 22 10:29:13 Zeus systemd-networkd[671]: veth99: Gained carrier
Mar 22 10:29:14 Zeus systemd-networkd[671]: veth99: Gained IPv6LL
```
In those functions where bus defaults to the m->bus, we should also
resolve the magic parameters. And if neither called with bus=NULL
and an unattached message, return properly instead of crashing in assert
later.
When starting a wayland session through a systemd service for a non-root
user, the compositor (based on wlroots) is denied the authorization to
change vt.
Once the user logs in, either through a local console or via ssh, the
compositor can work properly.
This is related to the login polkit policy:
- `allow_inactive` has value `auth_admin_keep`, denying any non-root
user session the authorization to change vt
- `allow_active` has value `yes`, which explains why the vt change
becomes possible once the user logs in through another channel
By changing the `allow_inactive` value to `yes`, any user session setup
in a service file can switch vt, allowing wayland sessions for non-root
users.
We used to log the following error:
"Start job for unit user-1000.slice failed with 'canceled'"
which can be really misleading if the actual job failed at *stopping* a unit.
Indeed "Start" was hard coded but it was wrong since we can also fail with stop
jobs which are enqueued when a session is stopped.
When specifying `DHCPv4.SendOption=`, it is used by systemd-networkd to
set the value of that option within the DHCP request that is sent out.
This differs to setting `DHCPServer.SendOption=`, which will place all
the options together as suboptions into the vendor-specific information
(code 43) option.
This commit adds two new config options, `DHCPv4.SendVendorOption=` and
`DHCPServer.SendVendorOption=`. These both have the behaviour of the old
`DHCPServer.SendOption=` flag, and set the value of the suboption in the
vendor-specific information option.
The behaviour of `DHCPServer.SendOption=` is then changed to reflect
that of `DHCPv4.SendOption=`. It will set the value of the corresponding
option in the DHCP request.
Calling `mac_selinux_enforcing()`, which calls `security_getenforce()`, on a SELinux disabled system causes the following error message to be printed:
Failed to get SELinux enforced status: No such file or directory
Fixes: 257188f80c ("selinux: cache enforced status and treat retrieve failure as enforced mode")
Supersedes: #15145
codesearch.debian.net shows no uses (except for the definition in systemd and
elogind).
$ cat > test.c
int main() {
sd_bus_try_close(NULL);
return 0;
}
$ gcc -Isrc/systemd -Wall -o testbus test.c -lsystemd
test.c: In function ‘main’:
test.c:4:3: warning: ‘sd_bus_try_close’ is deprecated [-Wdeprecated-declarations]
4 | sd_bus_try_close(NULL);
| ^~~~~~~~~~~~~~~~
In file included from test.c:1:
src/systemd/sd-bus.h:180:5: note: declared here
180 | int sd_bus_try_close(sd_bus *bus) _sd_deprecated_; /* deprecated */
| ^~~~~~~~~~~~~~~~
