Changing ISO BTRFS subvolumes

[jiibus]

Is it possible to change the subvolumes calamares creates during installation? I found a subvolume list in /etc/calamares/modules/mount.conf, but after adding my own desired subvolumes, the installer crashes when it comes to creating the subvolumes:

Create subvolume '/tmp/calamares-root-uk0o_soq/@'
Create subvolume '/tmp/calamares-root-uk0o_soq/@home'
Create subvolume '/tmp/calamares-root-uk0o_soq/@cache'
Create subvolume '/tmp/calamares-root-uk0o_soq/@log'
Create subvolume '/tmp/calamares-root-uk0o_soq/@crash'
Create subvolume '/tmp/calamares-root-uk0o_soq/@spool'
Python Error:
 <class 'KeyError'> 
 ('subvolume',) 
 File "/usr/lib/calamares/modules/mount/main.py", line 165, in run
    mount_partition(root_mount_point, partition, partitions)

  File "/usr/lib/calamares/modules/mount/main.py", line 115, in mount_partition
    root_mount_point + s['subvolume']]) 

Is there a better way of creating more subvolumes that I’m not thinking of?

[dalto]

It looks like there is an error in the mount.conf file. The format isn’t very forgiving.

Can we see the file you are trying to use?

[anon49550872]

Yes, you need to change mount.conf in /etc…

for example:

sudo nano /etc/calamares/modules/mount.conf
Add these to the end of the file:
-mountPoint: /.snapshots
subvolume: /@snapshots

Here it worked, that’s all I did to get @snapshots created, it also added an entry automatically to fstab

$ sudo btrfs subvolume list /
ID 256 gen 3425 top level 5 path @
ID 257 gen 3428 top level 5 path @home
ID 258 gen 3365 top level 5 path @cache
ID 259 gen 3426 top level 5 path @log
ID 260 gen 3395 top level 5 path @snapshots

fstab
UUID=81e1d399-1f9c-45d6-b4c4-7a8992bfb5e5 /.snapshots    btrfs   subvol=/@snapshots,defaults,noatime,space_cache,autodefrag,compress=lzo 0 0

[jiibus]

So I changed the btrfsSubvolumes to this:

btrfsSubvolumes:
    - mountPoint: /
      subvolume: /@
    - mountPoint: /home
      subvolume: /@home
    - mountPoint: /var/cache
      subvolume: /@cache
    - mountPoint: /var/log
      subvolume: /@log
    - mountPoint: /var/crash
      subvolume: /@crash
    - mountPoint: /var/spool
      subvolume: /@spool
    - mountPoint: /var/lib/docker
      subolume: /@docker
    - mountPoint: /var/lib/containers
      subvolume: /@containers
    - mountPoint: /var/tmp
      subvolume: /@var-tmp
    - mountPoint: /.swap
      subolvume: /@swap
    - mountPoint: /boot
      subolvume: /@boot

The installer crashed when it got to creating @docker.

[dalto]

Yes, that would crash.

You spelled subvolume wrong on several of those lines.

[jiibus]

Well I feel dumb. I looked it over and my brain skipped right over that haha.

[jiibus]

It doesn’t seem to like creating a subvolume called @swap, it seems that when you pick the option to create a swapfile the installer does that. Everything completed successfully when I took @swap out of the .conf. Thanks!