Port erofs root fs compression code to RHEL10 #1412
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jstodola
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Jul 17, 2024
Related: RHEL-48606
The cmdline switch, --squashfs-only, now sets this and the new --rootfs-type can be used to select other rootfs types. Currently only squashfs and squashfs-ext4 are actually implemented. This also changes the default to a plain squashfs without the wrapped ext4 image. This speeds up image creation and there is no longer a reason to use the wrapped ext4 method. Related: RHEL-48606
Passing 'erofs' will create a plain erofs compressed image. Passing 'erofs-ext4' will create a LiveOS/rootfs.img ext4 filesystem compressed by erofs. Related: RHEL-48606
Set the default compression style to lzma and use the config values when creating the erofs compressed rootfs. Resolves: RHEL-48606
[bcl - edited for brevity] It seems safer, to me, to accept --squashfs-only but simply ignore it (since the default value of --rootfs-type is squashfs anyway, and if someone were to specify both, I think it's sane for --rootfs-type to 'win'). Related: RHEL-48606 Signed-off-by: Adam Williamson <[email protected]> Signed-off-by: Brian C. Lane <[email protected]>
It works either way, but this is easier to read in the logs and matches the manpage. Related: RHEL-48606
These produce smaller images, at the expense of time. You can change the options used by passing a lorax.conf file that looks like this, eg. use 64k cluster size along with the dedupe and all-fragment options: [compression.erofs] type = lz4 args = -E dedupe,all-fragments -C 65536 And run with: lorax -c ./lorax.conf --rootfs-type erofs ... Related: RHEL-48606
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