Le jeudi 18 août 2022, 19:18:35 UTC Gioele Barabucci a écrit : > Hello, > > in 2020 there was a brief discussion on debian-devel@ about trimming > changelogs [1,2]. > > Now there is a working implementation of said functionality in > `dh_installchangelogs` [3]. Could you stress on the mapage that some license ask to document the change done by downstream in binary distribution and that in this case this tool should be disable bastien > > This implementation, combined with the evolution of the apt/dpkg > ecosystem that happened in the meantime, provides now all the benefits > of changelog trimming (less wasted space and bandwidth worldwide, > reduced processing time) without the downsides discussed at the time. > > ## In detail > > * `dh_installchangelogs` is modified install in binary packages the > trimmed changelogs, i.e. changelogs that contain only entries more > recent than the release date of oldstable. > > * The trimming is done automatically in compat >= 14. > > * The `--no-trim` option allows package maintainers that want to ship > the whole changelog a way to do so. > > * The full changelogs are preserved in the source packages and thus > available via `apt changelog` and similar mechanisms. > > * The trimming process happens at build time and requires no > modification to the changelogs stored in the VCS repos, nor changes to > the packaging. > > ## Data on file size reduction > > On a sample of ~13.000 packages, the median reduction in size of > gzip-9'ed changelogs is 56% (mean 50%). > > Ancient packages or heavily developed packages gain a lot from trimming > the changelogs. Some examples (gzipped → trimmed+gzipped): > > * debian-keyring: 664k → 47k (-92%) > * dpkg (essential): 223k → 22k (-90%) > * apt (essential): 156k → 14k (-90%) > * systemd: 110k → 23k (-78%) > * gcc-12: 189k → 18k (-90%) > * python3.9: 48k → 4k (-90%) > * e2fsprogs: 68k → 7k (-89%) > > ## Consensus > > Does anybody have objective objections against activating automatic > changelog trimming in binary packages? > > Regards, > > [1] https://lists.debian.org/debian-devel/2020/03/msg00299.html > [2] https://bugs.debian.org/954313 > [3] https://salsa.debian.org/debian/debhelper/-/merge_requests/80 > > -- > Gioele Barabucci
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