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04e2aea648
Builds a real Ubuntu ISO in ~2-3 minutes (vs 30-60 for production)
by keeping the package set minimal (casper + linux-generic only) and
using lz4 squashfs compression.
Design:
- Two-pass layered build (PASSES_TO_LAYERS=true):
- base: installs casper
- base.generic (LIVE_PASSES): installs linux-generic, triggers
update-initramfs with CASPER_GENERATE_UUID=1 to embed UUID
- No package pool (POOL_SEED_NAME=), no universe, amd64 only
- SQUASHFS_COMP=lz4 (~10x faster than xz); create_squashfs() now
respects ${SQUASHFS_COMP:-xz} so all other projects are unaffected
- Germinate is skipped (only add_package is used, no add_task/pool)
New files:
- live-build/ubuntu-test-iso/hooks/01-test-iso.chroot_early
- live-build/ubuntu-test-iso/hooks/02-test-iso-kernel.binary
Modified:
- live-build/functions: honour $SQUASHFS_COMP in create_squashfs()
- live-build/gen-iso-ids: add ubuntu-test-iso -> Ubuntu-Test-ISO
- live-build/auto/config: IMAGEFORMAT, fs, COMPONENTS, germinate
skip, SQUASHFS_COMP default + per-project override, project block,
write SQUASHFS_COMP to config/common, lxd exclusion, hook copying
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>