nixos/systemd-initrd: add missing kmod-blacklist src

[katexochen]

The file that is currently created is empty as src is missing.

cc @msanft

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[ElvishJerricco]

Whoa. I wonder how that happened. We should probably take this opportunity to review that perl oneliner. I have no idea what good it's doing, and it appears to be an unexplained relic from 10 years ago 0aa2c1d

[katexochen]

chatgpt: This command is reading the entire content of the source file ($src), searching for text that starts with ## file: iwlwifi.conf, followed by any characters (across multiple lines), and ending with ##. It then replaces that entire section with just ##. The processed content is written to a new file ($out).

I'd guess the initial intention was to remove the section of ## file: iwlwifi.conf up to the next ## file: ..., which does nothing right now because there is no other section after.

As it is currently doing nothing, we should be fine with removing it. Not sure we still want to remove the section, I don't think the referenced paths are available:

# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system.  When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/run/booted-system/sw/bin/lsmod | /run/booted-system/sw/bin/grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | /run/booted-system/sw/bin/xargs /run/booted-system/sw/bin/rmmod) \
&& /run/booted-system/sw/bin/modprobe -r mac80211