In #721190, Andreas Mohr suggested adding bz2 support to debirf. I think in implementing xz support (#813472) either it could be done in a generic way to be able to support different compression types, or possibly xz support would make bz2 support no longer interesting? (I guess it depends on platform, memory, cpu, decompression time, etc)
'gzip -9' seems to be hard coded in debirf in pack_rootfs and create_initrd_nested. -- Matt Taggart tagg...@debian.org