fix: resize for raid device, ensure vars like kiwi_RaidDev are loaded…

[fnordic]

Ensure var kiwi_RaidDev var is loaded before looking up disk.

Fixes # Resize operation with mirroring activated and oem-systemsize set.
The resize operation currently does not work for mirroring/raid root disks:

/run/initiramfs/log/kiwi.boot :

...
++ warn 'Requested OEM systemsize exceeds free space on the disk:'
...

Because $kiwi_RaidDev is unset for the lookup_disk_device_from_root function:

/run/initiramfs/log/kiwi.boot excerpt during failed resize:

...
++++ basename ../../md0
+++ root_device=/dev/md0
++++ lsblk -p -n -r -s -o NAME,TYPE /dev/md0
++++ grep -E 'disk|raid'
++++ cut -f1 -d ' '
+++ for disk_device in $(lsblk -p -n -r -s -o NAME,TYPE "${root_device}" | grep -E "disk|raid" | cut -f1 -d ' ')
+++ '[' false = true ']'
+++ type mdadm
+++ '[' -z '' ']'
+++ mdadm --detail -Y /dev/md0
+++ echo /dev/md0
+++ return
++ disk=/dev/md0
++ export disk
...

$RaidDev is empty in ['-z' ''] <--missing kiwi_RaidDev var

/run/initiramfs/log/kiwi.boot excerpt previously working, the disk was evaltued to vda:

...
+++ root_device=/dev/md0
++++ lsblk -p -n -r -s -o NAME,TYPE /dev/md0
++++ grep -E 'disk|raid'
++++ cut -f1 -d ' '
+++ for disk_device in $(lsblk -p -n -r -s -o NAME,TYPE "${root_device}" | grep -E "disk|raid" | cut -f1 -d ' ')
+++ '[' false = true ']'
+++ type mdadm
+++ '[' -z /dev/md0 ']'
+++ for disk_device in $(lsblk -p -n -r -s -o NAME,TYPE "${root_device}" | grep -E "disk|raid" | cut -f1 -d ' ')
+++ '[' false = true ']'
+++ type mdadm
+++ '[' -z /dev/md0 ']'
+++ echo /dev/vda
++ disk=/dev/vda
++ export disk
...

Changes proposed in this pull request:

Lookup root disk device after loading partition id setup (with var kiwi_RaidDev).

This works for me, but I'm not sure if you even want to run lookup_disk_device_from_root without kiwi_RaidDev variable set in case partition_ids=/config.partids does not exit.

Maybe lookup_disk_device_from_root should not use vars from .config.partids.

[schaefi]

good catch, thanks much 👍

[schaefi]

Maybe lookup_disk_device_from_root should not use vars from .config.partids.

There is room for a better refactor of that code part I agree