lvm2 initramfs activation conflicts with udev and systemd

[ololoshwin]

Hello
I have custom initramfs to activate lvm volume for roof filesystem.

Everything works except warning in systemct:
dev-mapper-sys-root.device loaded activating tentative /dev/mapper/sys-root

This is because udev marked this device as not ready for systemd:
# udevadm info /dev/mapper/sys-root
…
E: DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG=1
E: DM_UDEV_DISABLE_DISK_RULES_FLAG=1
E: DM_UDEV_DISABLE_OTHER_RULES_FLAG=1
E: SYSTEMD_READY=0
E: TAGS=:systemd:
E: CURRENT_TAGS=:systemd:



How can I pass control over device to the udevd/systemd ?

[zen_desu]

https://github.com/desultory/ugrd/blob/ ... dev.py#L22


I'm not claiming this is perfect, and would appreciate any feedback on how this may be incorrect, but this is what I do in ugrd and it seems to work well enough.

Code: Select all

    for dm in /sys/block/dm-*; do
        if [ ! -e "${dm}/uevent" ]; then
            continue
        fi
        source "${dm}/uevent"
        einfo "Faking udev for: ${DEVNAME}"
        udev_db_file="/run/udev/data/b${MAJOR}:${MINOR}"
        printf 'E:DM_UDEV_PRIMARY_SOURCE_FLAG=1\n' > "${udev_db_file}"
    done

More info at: https://github.com/desultory/ugrd/issues/181
https://github.com/lvmteam/lvm2/issues/ ... 2268468603