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Daan De Meyer ecd3c86b60 Silence cgroups v1 read-only filesystem warning 
Avoid warning messages when booting systemd-nspawn containers and using
hybrid or legacy cgroups. systemd-nspawn mounts the cgroups v1 controller
tree as read-only so these errors are expected and not problematic.
Partially fixes #17862.

Test plan:

- Before: `mkosi --default .mkosi/mkosi.fedora boot`

```
‣ Processing default...
Spawning container image on /home/daan/projects/systemd/image.raw.
Press ^] three times within 1s to kill container.
systemd 247 running in system mode. (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +BZIP2 +LZ4 +XZ +ZLIB +ZSTD +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
Detected virtualization systemd-nspawn.
Detected architecture x86-64.

Welcome to Fedora 33 (Thirty Three)!

Queued start job for default target Graphical Interface.
-.slice: Failed to migrate controller cgroups from , ignoring: Read-only file system
system.slice: Failed to delete controller cgroups /system.slice, ignoring: Read-only file system
[  OK  ] Created slice system-getty.slice.
[  OK  ] Created slice system-modprobe.slice.
user.slice: Failed to delete controller cgroups /user.slice, ignoring: Read-only file system
[  OK  ] Created slice User and Session Slice.
[  OK  ] Started Dispatch Password Requests to Console Directory Watch.
[  OK  ] Started Forward Password Requests to Wall Directory Watch.
[  OK  ] Reached target Local Encrypted Volumes.
[  OK  ] Reached target Paths.
[  OK  ] Reached target Remote File Systems.
[  OK  ] Reached target Slices.
[  OK  ] Reached target Swap.
[  OK  ] Listening on Process Core Dump Socket.
[  OK  ] Listening on initctl Compatibility Named Pipe.
[  OK  ] Listening on Journal Socket (/dev/log).
[  OK  ] Listening on Journal Socket.
[  OK  ] Listening on User Database Manager Socket.
dev-hugepages.mount: Failed to delete controller cgroups /dev-hugepages.mount, ignoring: Read-only file system
         Mounting Huge Pages File System...
sys-fs-fuse-connections.mount: Failed to delete controller cgroups /sys-fs-fuse-connections.mount, ignoring: Read-only file system
         Mounting FUSE Control File System...
         Starting Journal Service...
         Starting Remount Root and Kernel File Systems...
system.slice: Failed to delete controller cgroups /system.slice, ignoring: Read-only file system
```

After: `mkosi --default .mkosi/mkosi.fedora boot`

```
‣ Processing default...
Spawning container image on /home/daan/projects/systemd/mkosi.output/image.raw.
Press ^] three times within 1s to kill container.
systemd 247 running in system mode. (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +BZIP2 +LZ4 +XZ +ZLIB +ZSTD +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
Detected virtualization systemd-nspawn.
Detected architecture x86-64.

Welcome to Fedora 33 (Thirty Three)!

Queued start job for default target Graphical Interface.
[  OK  ] Created slice system-getty.slice.
[  OK  ] Created slice system-modprobe.slice.
[  OK  ] Created slice User and Session Slice.
[  OK  ] Started Dispatch Password Requests to Console Directory Watch.
[  OK  ] Started Forward Password Requests to Wall Directory Watch.
[  OK  ] Reached target Local Encrypted Volumes.
[  OK  ] Reached target Paths.
[  OK  ] Reached target Remote File Systems.
[  OK  ] Reached target Slices.
[  OK  ] Reached target Swap.
[  OK  ] Listening on Process Core Dump Socket.
[  OK  ] Listening on initctl Compatibility Named Pipe.
[  OK  ] Listening on Journal Socket (/dev/log).
[  OK  ] Listening on Journal Socket.
[  OK  ] Listening on User Database Manager Socket.
         Mounting Huge Pages File System...
         Mounting FUSE Control File System...
         Starting Journal Service...
         Starting Remount Root and Kernel File Systems...
[  OK  ] Mounted Huge Pages File System.
[  OK  ] Mounted FUSE Control File System.
[  OK  ] Finished Remount Root and Kernel File Systems.
         Starting Create Static Device Nodes in /dev...
[  OK  ] Finished Create Static Device Nodes in /dev.
[  OK  ] Reached target Local File Systems (Pre).
[  OK  ] Reached target Local File Systems.
         Starting Restore /run/initramfs on shutdown...
[  OK  ] Finished Restore /run/initramfs on shutdown.
[  OK  ] Started Journal Service.
         Starting Flush Journal to Persistent Storage...
[  OK  ] Finished Flush Journal to Persistent Storage.
         Starting Create Volatile Files and Directories...
[  OK  ] Finished Create Volatile Files and Directories.
         Starting Network Name Resolution...
         Starting Update UTMP about System Boot/Shutdown...
[  OK  ] Finished Update UTMP about System Boot/Shutdown.
[  OK  ] Reached target System Initialization.
[  OK  ] Started Daily Cleanup of Temporary Directories.
[  OK  ] Reached target Timers.
[  OK  ] Listening on D-Bus System Message Bus Socket.
[  OK  ] Reached target Sockets.
[  OK  ] Reached target Basic System.
         Starting Home Area Manager...
         Starting User Login Management...
         Starting Permit User Sessions...
[  OK  ] Finished Permit User Sessions.
[  OK  ] Started Console Getty.
[  OK  ] Reached target Login Prompts.
         Starting D-Bus System Message Bus...
[  OK  ] Started D-Bus System Message Bus.
[  OK  ] Started Home Area Manager.
[  OK  ] Started User Login Management.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Finished Update UTMP about System Runlevel Changes.
[  OK  ] Started Network Name Resolution.
[  OK  ] Reached target Host and Network Name Lookups.

Fedora 33 (Thirty Three) (built from systemd tree)
Kernel 5.9.11-arch2-1 on an x86_64 (console)
```
2020-12-09 12:37:16 +00:00
..
all-units.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
apparmor-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
apparmor-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
audit-fd.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
audit-fd.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
automount.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
automount.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
bpf-devices.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
bpf-devices.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
bpf-firewall.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
bpf-firewall.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
cgroup.c Silence cgroups v1 read-only filesystem warning 2020-12-09 12:37:16 +00:00
cgroup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
core-varlink.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
core-varlink.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-automount.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-automount.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-cgroup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-cgroup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-device.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-device.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-execute.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-execute.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-job.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-job.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-kill.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-kill.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-manager.c shared/build: make the version string definition less terrible 2020-12-03 12:16:02 +01:00
dbus-manager.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-mount.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-mount.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-path.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-path.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-scope.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-scope.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-service.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-service.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-slice.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-slice.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-socket.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-socket.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-swap.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-swap.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-target.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-target.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-timer.c Merge pull request #17497 from anitazha/randomizeonce 2020-11-10 13:29:04 +01:00
dbus-timer.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-unit.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-unit.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-util.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus-util.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dbus.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
device.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
device.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dynamic-user.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dynamic-user.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
efi-random.c random-util: open /dev/urandom implicitly in random_write_entropy() if needed 2020-12-03 20:14:17 +01:00
efi-random.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
emergency-action.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
emergency-action.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
execute.c Merge pull request #17079 from keszybz/late-exec-resolution 2020-12-03 14:58:20 +01:00
execute.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
generator-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
generator-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
hostname-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
hostname-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
ima-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
ima-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
ip-address-access.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
ip-address-access.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
job.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
job.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
kill.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
kill.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
killall.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
killall.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
kmod-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
kmod-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
load-dropin.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
load-dropin.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
load-fragment-gperf-nulstr.awk build-sys: fix the script used for generating load_fragment_gperf_nulstr (#6646) 2017-08-26 23:21:23 +09:00
load-fragment-gperf.gperf.m4 timer: add new feature FixedRandomDelay= 2020-11-05 10:59:33 -08:00
load-fragment.c Merge pull request #17549 from yuwata/tiny-fixes 2020-11-09 16:04:01 +01:00
load-fragment.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
locale-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
locale-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
loopback-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
loopback-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
machine-id-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
machine-id-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
macros.systemd.in license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
main.c random-util: open /dev/urandom implicitly in random_write_entropy() if needed 2020-12-03 20:14:17 +01:00
manager.c manager: Fix HW watchdog when systemd starts before driver loaded 2020-12-09 11:47:22 +00:00
manager.h manager: Fix HW watchdog when systemd starts before driver loaded 2020-12-09 11:47:22 +00:00
meson.build meson: add option to skip installing to $sysconfdir 2020-11-12 11:21:46 +01:00
mount-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
mount-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
mount.c core: prevent excessive /proc/self/mountinfo parsing 2020-12-01 15:15:39 +01:00
mount.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
namespace.c Don't assume /run/systemd exists when creating unit-root 2020-12-05 11:11:58 +00:00
namespace.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
org.freedesktop.systemd1.conf license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
org.freedesktop.systemd1.policy.in license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
org.freedesktop.systemd1.service license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
path.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
path.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
scope.c scope: on unified, make sure to unwatch all PIDs once they've been moved to the cgroup scope 2020-12-01 09:33:14 +01:00
scope.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
selinux-access.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
selinux-access.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
selinux-setup.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
selinux-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
service.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
service.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
show-status.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
show-status.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
slice.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
slice.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
smack-setup.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
smack-setup.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
socket.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
socket.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
swap.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
swap.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
system.conf.in log: add support for prefixing console log messages with current timestamp 2020-02-10 07:01:30 -05:00
systemd.pc.in license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
target.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
target.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
timer.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
timer.h Merge pull request #17497 from anitazha/randomizeonce 2020-11-10 13:29:04 +01:00
transaction.c license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
transaction.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
triggers.systemd.in license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
unit-printf.c core: fix typo 2020-11-27 14:35:20 +09:00
unit-printf.h license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
unit.c core: use SYNTHETIC_ERRNO() macro 2020-11-27 14:35:20 +09:00
unit.h Merge pull request #16603 from benzea/benzea/special-app-slice 2020-11-11 14:11:02 +01:00
user.conf.in log: add support for prefixing console log messages with current timestamp 2020-02-10 07:01:30 -05:00