Re: [Buildroot] lvm2 seems to require systemd

[Arnout Vandecappelle via buildroot <buildroot@buildroot.org>]

  Hi Frank,

On 20/07/2024 21:49, Frank Wunderlich via buildroot wrote:
> Hi
> 
> in the meantime i tried to add systemd (which i want to avoid due to size and complexity)
> 
> BR2_PACKAGE_SYSTEMD=y
> BR2_INIT_SYSTEMD=y
> 
> but hang on this:
> 
> Found CMake: /media/data_ext/git/buildroot/output/per-package/systemd/host/bin/cmake (3.28.3)
> Run-time dependency libbpf found: NO (tried pkgconfig and cmake)
> Run-time dependency mount found: NO (tried pkgconfig and cmake)
> 
> output/build/systemd-254.13/meson.build:1188:11: ERROR: Dependency "mount" not found, tried pkgconfig and cmake

  This smells like you changed the config and didn't do a clean rebuild. systemd 
selects some sub-options of util-linux, and in your first build, those weren't 
enabled. You can probably fix it with 'make util-linux-dirclean; make'. But just 
to be safe, 'make clean; make' is better.


> tried installing libmount-dev pkgconf-bin libbpf-dev on my building-machine without success
> 
> also tried without BR2_INIT_SYSTEMD, which compiles good, but the error below is on running bootup (before login)
> so i guess i need systemd as init, but maybe i'm wrong
> 
> regards Frank
> 
> 
>> Gesendet: Samstag, 20. Juli 2024 um 14:34 Uhr
>> Von: "Frank Wunderlich" <frank-w@public-files.de>
>> An: buildroot@buildroot.org
>> Betreff: lvm2 seems to require systemd
>>
>> Hi,
>>
>> i try to build a buildroot (2024.05) initrd with lvm2 support
>>
>> so basicly added these options:
>>
>> #to select BR2_PACKAGE_HAS_UDEV
>> BR2_PACKAGE_EUDEV=y
>> BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
>> BR2_PACKAGE_LIBBLOCKDEV=y
>> BR2_PACKAGE_LVM2=y
>>
>> build is fine, but i see this while bootup:
>>
>> [    3.665010] udevd[1520]: failed to execute '/usr/bin/systemd-run' '/usr/bin/systemd-run --no-block --property DefaultDependencies=
>> no --unit lvm-activate-vg-nvme /usr/sbin/lvm vgchange -aay --autoactivation event vg-nvme': No such file or directory

  I guess the udev rule for lvm2 is systemd-specific... You will have to either 
re-write the udev rule, or write an init script, to do the equivalent if systemd 
is not enabled. Look in the lvm-activate-vg-nvme systemd unit and rewrite that 
logic in a shell script.

  You can add these udev rules and scripts to the lvm2 package and install them 
with the LVM2_INSTALL_INIT_SYSV variable [1].

  Regards,
  Arnout

[1] https://buildroot.org/downloads/manual/manual.html#generic-package-reference



>> done
>>
>> i see the physical volume, but logical volumes are disabled
>>
>> # pvscan
>>    PV /dev/nvme0n1p5   VG vg-nvme   lvm2 [<1.79 TiB / <1.78 TiB free]
>>    Total: 1 [<1.79 TiB] / in use: 1 [<1.79 TiB] / in no VG: 0 [0   ]
>> # vgscan
>>    Found volume group "vg-nvme" using metadata type lvm2
>> # lvscan
>>    inactive          '/dev/vg-nvme/var' [10.00 GiB] inherit
>>
>> and so i cannot mount the logical volume
>>
>> # mount /dev/vg-nvme/var /mnt
>> [  281.006375] /dev/vg-nvme/var: Can't lookup blockdev
>> [  281.011279] /dev/vg-nvme/var: Can't lookup blockdev
>> [  281.016202] /dev/vg-nvme/var: Can't lookup blockdev
>> [  281.021080] /dev/vg-nvme/var: Can't lookup blockdev
>> mount: mounting /dev/vg-nvme/var on /mnt failed: No such file or directory
>>
>> any ideas?
>>
>> regards Frank
>>
>>
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