Package: pxz Version: 4.999.99~beta3+git659fc9b-3 Severity: minor I build Debian Live images. A lot. Waiting for update-initramfs is boring. I want to speed it up using pxz or pixz (not xz).
The kernel's XZ decompressor does not support CRC64, xz's default. When using COMPRESS=xz, mkinitramfs (initramfs-tools) passes --check=crc32 to fix this. (Reference: https://www.kernel.org/doc/Documentation/xz.txt) pxz accepts the equivalent option, but ignores it: (bootstrap)root@zygon:/boot# xzcat initrd.img | datefudge 2000-01-01 pxz -0Ccrc32 -T1 >a (bootstrap)root@zygon:/boot# xzcat initrd.img | datefudge 2000-01-01 pxz -0Ccrc64 -T1 >b (bootstrap)root@zygon:/boot# xzcat initrd.img | datefudge 2000-01-01 pxz -0Cwaffles -T1 >c (bootstrap)root@zygon:/boot# sha1sum a b c 8df3800e37881acd3b4c79e76f793dc290a69958 a 8df3800e37881acd3b4c79e76f793dc290a69958 b 8df3800e37881acd3b4c79e76f793dc290a69958 c If the option was working, the checksums would be different (I think). The kernel becomes sad: (bootstrap)root@zygon:/boot# qemu-system-x86_64 -nographic -kernel vmlinuz -initrd initrd.img -append console=ttyS0 [...works...] (bootstrap)root@zygon:/boot# qemu-system-x86_64 -nographic -kernel vmlinuz -initrd a -append console=ttyS0 [...] [ 0.653683] Initramfs unpacking failed: Input was encoded with settings that are not supported by this XZ decoder [...] Please make pxz honor -Ccrc32, or at least stop accepting it (exit non-zero instead).
