[elbe-users] Image with flat BTRFS Layout
Müller, Steffen - LT
Mueller.Steffen at litef.de
Mon Nov 18 13:31:13 CET 2024
Hello,
I want to use ELBE to build an Debian Image with filesystem type BTRFS.
For an "easy" Layout I used this xml settings:
<images>
<msdoshd>
<partition>
<size>remain</size>
<label>BTRFS</label>
</partition>
</msdoshd>
</images>
<fstab>
<bylabel>
<label>BTRFS</label>
<mountpoint>/</mountpoint>
<fs>
<type>btrfs</type>
</fs>
</bylabel>
<fstab>
This works fine.
Now I want to implement a flat BTRFS design:
https://archive.kernel.org/oldwiki/btrfs.wiki.kernel.org/index.php/SysadminGuide.html#Subvolumes
<images>
<msdoshd>
<partition>
<size>remain</size>
<label>BTRFS</label>
</partition>
</msdoshd>
</images>
<fstab>
<bylabel>
<label>BTRFS</label>
<mountpoint>/</mountpoint>
<fs>
<!-- fs type and options -->
<type>btrfs</type>
<fs-finetuning>
<path-command>echo "subvol=/rfs"</path-command>
</fs-finetuning>
</fs>
<options>subvol=/rfs,defaults,noatime</options>
</bylabel>
<bylabel>
<label>BTRFS</label>
<mountpoint>/home</mountpoint>
<fs>
<!-- fs type and options -->
<type>btrfs</type>
<fs-finetuning>
<path-command>echo "subvol=/rfshome"</path-command>
</fs-finetuning>
</fs>
<options>subvol=/rfshome,defaults,noatime</options>
</bylabel>
<bylabel>
<label>BTRFS</label>
<mountpoint>/</mountpoint>
<fs>
<!-- fs type and options -->
<type>btrfs</type>
<!-- subvolumes may be specified in fs-finetuning -->
<fs-finetuning>
<path-command>btrfs subvolume create {path}/rfs</path-command>
<path-command>btrfs subvolume create {path}/rfshome</path-command>
</fs-finetuning>
</fs>
<nofstab/>
</bylabel>
</fstab>
The image generation does work. But both subvolumes are empty and the Debian image is installed on the subvolume=/.
In addition the home directory is empty too.
Can someone help me?
Here is the corresponding output of log.txt:
[CMD] losetup --find --show --partscan --offset 140257280 --sizelimit 7375935488 /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/bookworm-arm64-industrial.img
[CMD] mkfs.btrfs -L BTRFS /dev/loop0
btrfs-progs v6.2
See http://btrfs.wiki.kernel.org for more information.
Performing full device TRIM /dev/loop0 (6.87GiB) ...
NOTE: several default settings have changed in version 5.15, please make sure
this does not affect your deployments:
- DUP for metadata (-m dup)
- enabled no-holes (-O no-holes)
- enabled free-space-tree (-R free-space-tree)
Label: BTRFS
UUID: 255f685c-3014-405c-a77e-8c2501fced9b
Node size: 16384
Sector size: 4096
Filesystem size: 6.87GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 256.00MiB
System: DUP 8.00MiB
SSD detected: no
Zoned device: no
Incompat features: extref, skinny-metadata, no-holes
Runtime features: free-space-tree
Checksum: crc32c
Number of devices: 1
Devices:
ID SIZE PATH
1 6.87GiB /dev/loop0
[CMD] mount /dev/loop0 /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt
[CMD] btrfs subvolume create /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt/rfs
Create subvolume '/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt/rfs'
[CMD] btrfs subvolume create /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt/rfshome
Create subvolume '/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt/rfshome'
[CMD] cp -a /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/filesystems/1/. /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt/
[CMD] umount /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/imagemnt
[CMD] losetup --detach /dev/loop0
[CMD] mv "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/filesystems/1"/* "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/target/"
[CMD] mv "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/filesystems/0"/* "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/target/boot"
[CMD] mv "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/filesystems/2"/* "/var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/target/home"
[CMD] tar cfz /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/bookworm-arm64-industrial.tgz -C /var/cache/elbe/01933ee6-4ace-73d3-93ed-2caa9a52abd2/target/ .
Thanks fr your help.
Kind regards,
Steffen Müller
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