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* [linux-lvm] vgcfgrestore + pvcreate using liblockdev api in C
@ 2020-09-14  5:56 Tomas Dalebjörk
  2020-09-15 11:55 ` Vojtěch Trefný
  0 siblings, 1 reply; 2+ messages in thread
From: Tomas Dalebjörk @ 2020-09-14  5:56 UTC (permalink / raw)
  To: linux-lvm


Is there an api available today or an example how to perform the below OS commands in C using a function or api instead of system calls?

1. create an unique uid on the server, and store it on the PV disk

# pvcreatue -u <generated uid> <your device>

2. create the LVM metadata backup content (as /etc/lvm/backup/...)
- add PV uid generated above as there is no parameter to save the data to a device
- add unique VG
- add exactly 1 contiguous LV

3. save LVM metadata to the PV disk as the OS command does

# vgcfgrestore VG

Can this be done by instead of using system() calls, instead using native C commands either via an API or other methods?

the examples for bd_lvm_pvcreate() in libblockdevapi for example does not say how to add -u flag
and I couldn’t find any vgcfgrestore there too?

besides this, I found it strange why pvcreate -u is needed at all? would be better to have a <dev> parameter directly to the vgcfgrestore command instead

looking forward to hearing from you soon again 

regards Tomas

Sent from my iPhone

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