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Build option "link-networkd-shared" to build a statically linked
systemd-networkd by using
-Dlink-udev-shared=false -Dlink-networkd-shared=false
on systems with full systemd stack except systemd-networkd, such
as RHEL/CentOS 8.
To make this easier to understand, let's always log (at debug level)
when we accept or reject each device:
/swapfile: detection of swap file offset on Btrfs is not supported
/swapfile: is a candidate device.
/dev/zram0: ignoring zram swap
/dev/vdb: ignoring device with lower priority
/dev/vdc: ignoring device with lower usable space
...
If we know that hibernation will fail, refuse. This includes cases where
/sys/power/resume is set and doesn't match any device, or
/sys/power/resume_offset is set and we're not on btrfs and it doesn't match.
If /sys/power/resume is not set at all, we still accept the device with the
highest priority (see 6d176522f5 and
88bc86fcf8)
Tested cases:
1. no swap active → refuse
2. just zram swap active → refuse
3. swapfile on btrfs with /sys/power/resume{,_offset} set → OK
4. swapfile on btrfs with /sys/power/resume set, offset not set → refuse
5. swapfile on btrfs with /sys/power/resume set to nonexistent device, offset set → refuse
6. /sys/power/resume not set, offset set, candidate exists → OK (*)
7. /sys/power/resume not set, offset not set, candidate exists → OK
(*) I think this should fail, but I'm leaving that for the next commit.
Let's use uppercase wording in the description string, like we usually
do.
Let's allow using this service in early boot.
If it's pulled into the initial transaction it's better to finish
loading this before sysinit.target.
Don't bother with this in containers that lack CAP_SYS_MODULE
Devices referred to by `DeviceAllow=` sandboxing are resolved into their
corresponding major numbers when the unit is loaded by looking at
`/proc/devices`. If a reference is made to a device which is not yet
available, the `DeviceAllow` is ignored and the unit's processes cannot
access that device.
In both logind and nspawn, we have `DeviceAllow=` lines, and `modprobe`
in `ExecStartPre=` to load some kernel modules. Those kernel modules
cause device nodes to become available when they are loaded: the device
nodes may not exist when the unit itself is loaded. This means that the
unit's processes will not be able to access the device since the
`DeviceAllow=` will have been resolved earlier and denied it.
One way to fix this would be to re-evaluate the available devices and
re-apply the policy to the cgroup, but this cannot work atomically on
cgroupsv1. So we fall back to a second approach: instead of running
`modprobe` via `ExecStartPre`, we move this out to a separate unit and
order it before the units which want the module.
Closes#14322.
Fixes: #13943.
Let's add the actual unicode names of the glyphs we use. Let's also add
in comments what the width expectations of these glyphs are on the
console.
Also, remove the "mdash" definition. First of all it wasn't used, but
what's worse the glyph encoded was actually an "ndash"...
Fixes: #14075
We wait for "basic.target" being reached in the user instance anyway
before allowing the user's session to start, hence doing such a wait is
unnecessary, since that would just mean we'd wait for "default.target"
on top of "basic.target", but we shouldn#t need anything of that...
Hence, let's simplify this, reduce explicit sync points.
The name is not as universal as we want, still, hence let's use our own
user we create with sysusers.d/. That should yield same behaviour
everywhere (and also test sysusers a bit as side effect).
let's make sure we always invoke our commands through /bin/sh, since
on some distros su will use /bin/nologin (or whatever is listed in
/etc/passwd) as shell otherwise and we don#t want that.
When calculation of swap file offset is unsupported, rely on the
/sys/power/resume & /sys/power/resume_offset values if configured
rather than requiring a matching swap entry to be identified.
Refactor to use dev_t for comparison of resume= device instead of string.
In the steps given in #13850, the resulting graph looks like:
C (Anchor) -> B -> A
Since B is inactive, it will be flagged as redundant and removed from
the transaction, causing A to get garbage collected. The proposed fix is
to not mark nodes as redundant if doing so causes a relevant node to be
garbage collected.
Fixes#13850
