Package: pristine-tar Version: 1.45 Severity: normal Dear Maintainers,
pristine-xz can't reproduce this tarball: https://mirrors.edge.kernel.org/pub/software/network/iw/iw-4.14.tar.xz Decompressing and recompressing it with `xz` produces a file of the exact size but with a different hash: -rw-r--r-- 1 pl pl 114096 Jan 4 2018 iw-4.14.tar.xz sha1sum: 335898be067d0083c5aaadde7db8ba2371050fcd iw-4.14.tar.xz After compressing/decompressing with `xz` (or `xz -6`): -rw-r--r-- 1 pl pl 114096 Jan 4 2018 iw-4.14.tar.xz sha1sum: 6c739a26aaa5d94ea68a55f348c7f648e158c6b5 iw-4.14.tar.xz Bug #869191 suggests that the kernel.org people use `pixz -9 -p6 -t` to generate their xz-balls, and indeed it works even in this case: compressing iw-4.14.tar with `pixz -9 -p6 -t` produces a file that exactly matches upstream's. #869191 suggests that `xz -T6` is able to reproduce the output of `pixz -9 -p6 -t`, this has been reported to work in a few cases and the workaround implemented in pristine-xz. Unfortunately this is not the case with iw-4.14.tar.xz: `xz -T6` produces a different file from `pixz -9 -p6 -t`, they even differ in size. I tried a few combinations of options and compressions levels with no luck. The solution proposed in #869191 is not general and this somehow limits the usability of pristine-xz. Paride -- System Information: Debian Release: buster/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 4.18.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE=en_IE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages pristine-tar depends on: ii libbz2-1.0 1.0.6-9 ii libc6 2.27-8 ii perl 5.28.0-3 ii tar 1.30+dfsg-2 ii xdelta 1.1.3-9.2 ii xdelta3 3.0.11-dfsg-1+b1 ii zlib1g 1:1.2.11.dfsg-1 Versions of packages pristine-tar recommends: ii bzip2 1.0.6-9 ii pbzip2 1.1.9-1+b1 ii xz-utils 5.2.2-1.3 pristine-tar suggests no packages. -- no debconf information
