This wrapper is useful independently of pandoc-drawio-filter — it's
useful in any other situation in which somebody might want to use
draw.io diagrams in a build process.
So, make it accessible from the top level to facilitate reuse.
libnih is a niche low-level library. It was used for lxc and cgmanager.
Reverse dependencies were removed of transitioned from libnih a few years ago.
Nowadays libnih does not build against upstream gcc-10. Let's remove it.
dirmngr was merged into gnupg long ago. nixpkgs does not use it as a
dependency anywhere. On top of that it fails to build on upstream
gcc-10 as:
ld: validate.o:/build/dirmngr-1.1.1/src/dirmngr.h:123:
multiple definition of `opt'; dirmngr.o:/build/dirmngr-1.1.1/src/dirmngr.h:123: first defined here
Let's remove the package.
This should be a significant disk space saving for most NixOS
installations. This method is a bit more complicated than doing it in
the postInstall for the firmware derivations, but this way it's
automatic, so each firmware package doesn't have to separately
implement its compression.
Currently, only xz compression is supported, but it's likely that
future versions of Linux will additionally support zstd, so I've
written the code in such a way that it would be very easy to implement
zstd compression for those kernels when they arrive, falling back to
xz for older (current) kernels.
I chose the highest possible level of compression (xz -9) because even
at this level, decompression time is negligible. Here's how long it took
to decompress every firmware file my laptop uses:
i915/kbl_dmc_ver1_04.bin 2ms
regulatory.db 4ms
regulatory.db.p7s 3ms
iwlwifi-7265D-29.ucode 62ms
9d71-GOOGLE-EVEMAX-0-tplg.bin 22ms
intel/dsp_fw_kbl.bin 65ms
dsp_lib_dsm_core_spt_release.bin 6ms
intel/ibt-hw-37.8.10-fw-22.50.19.14.f.bseq 7ms
And since booting NixOS is a parallel process, it's unlikely (but
difficult to measure) that the time to user interaction was held up at
all by most of these.
Fixes (partially?) #148197
Daniel Poelzleithner