This option behaves exactly like `boot.extraModprobeConfig`, except that it also includes the generated modprobe.d file in the initrd.
Many years ago, someone tried to include the normal modprobe.d/nixos.conf file generated by `boot.extraModprobeConfig` in the initrd: 0aa2c1dc46. This file contains a reference to a directory with firmware files inside. Including firmware in the initrd made it too big, so the commit was reverted again in 4a4c051a95.
The `boot.extraModprobeConfig` option not changing the initrd caused me much confusion because I tried to set the maximum cache size for ZFS and it didn't work.
Closes https://github.com/NixOS/nixpkgs/issues/25456.
This fixes:
--------------------------------------------------------------------------------
configuring
ERROR at //ui/gtk/BUILD.gn:17:1: Assertion failed.
assert(use_gio, "GIO is required for building with GTK")
^-----
GIO is required for building with GTK
See //content/shell/BUILD.gn:308:15: which caused the file to be included.
deps += [ "//ui/gtk" ]
^---------
--------------------------------------------------------------------------------
But there's still another build issue(s) left:
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[25491/48383] ACTION //components/url_formatter/spoof_checks/top_domains:generate_top_domain_list_variables_file(//build/toolchain/linux/unbundle:default)d_tmp/browser_command.mojom-webui.jsab_page_third_party.mojom-webui.js
FAILED: gen/components/url_formatter/spoof_checks/top_domains/top500-domains-inc.cc
python3 ../../build/gn_run_binary.py make_top_domain_list_variables ../../components/url_formatter/spoof_checks/top_domains/domains.list top500_domains gen/components/url_formatter/spoof_checks/top_domains/top500-domains-inc.cc
make_top_domain_list_variables failed with exit code -4
ninja: build stopped: subcommand failed.
--------------------------------------------------------------------------------
Otherwise you end up with a derivation that refers to the original
path (which is not in the Nix store and not accessible to
builders). This caused the derivation paths for the docbookrx package
(removed on master) to depend on the location of the nixpkgs source
tree.
