* Given a kernel build (with modules in $kernel/lib/modules/VERSION),
`modules-closure.nix' produces a module tree in $out/lib/modules/VERSION that contains only the modules identified by `rootModules', plus their dependencies. It also generates an appropriate modules.dep. This is useful for initrds, as we obviously don't want a copy of the entire kernel module tree in the initial RAM disk. svn path=/nixu/trunk/; revision=6939
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parent
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@ -26,7 +26,7 @@ mount -t sysfs sys /sys
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source @makeDevices@
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# Load some kernel modules.
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export MODULE_DIR=@kernel@/lib/modules/
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export MODULE_DIR=@modules@/lib/modules/
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modprobe ide-generic
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modprobe ide-disk
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modprobe ide-cd
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@ -5,17 +5,17 @@
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# is supposed to be put into an initial RAM disk (initrd).
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{ genericSubstituter, shell, staticTools
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, module_init_tools, utillinux, kernel
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, module_init_tools, utillinux, modules
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}:
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genericSubstituter {
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src = ./boot-stage-1-init.sh;
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isExecutable = true;
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inherit shell kernel;
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inherit shell modules;
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path = [
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staticTools
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module_init_tools
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utillinux
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# utillinux
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];
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makeDevices = ./make-devices.sh;
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}
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13
test/modules-closure.nix
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13
test/modules-closure.nix
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@ -0,0 +1,13 @@
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# Given a kernel build (with modules in $kernel/lib/modules/VERSION),
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# produce a module tree in $out/lib/modules/VERSION that contains only
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# the modules identified by `rootModules', plus their dependencies.
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# Also generate an appropriate modules.dep.
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{stdenv, kernel, rootModules, module_init_tools}:
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stdenv.mkDerivation {
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name = kernel.name + "-shrunk";
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builder = ./modules-closure.sh;
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inherit kernel rootModules module_init_tools;
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allowedReferences = ["out"];
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}
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37
test/modules-closure.sh
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37
test/modules-closure.sh
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@ -0,0 +1,37 @@
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source $stdenv/setup
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set -o pipefail
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PATH=$module_init_tools/sbin:$PATH
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version=$(cd $kernel/lib/modules && ls -d *)
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echo "kernel version is $version"
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export MODULE_DIR=$kernel/lib/modules/
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# Determine the dependencies of each root module.
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closure=
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for module in $rootModules; do
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echo "root module: $module"
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deps=$(modprobe --set-version "$version" --show-depends "$module" \
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| sed 's/^insmod //')
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for i in $deps; do echo $i; done
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closure="$closure $deps"
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done
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# Remove duplicates.
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closure=$(for i in $closure; do echo $i; done | sort | uniq)
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echo "closure:"
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ensureDir $out
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for module in $closure; do
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echo $module
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target=$(echo $module | sed "s^$kernel^$out^")
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mkdir -p $(dirname $target)
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cp $module $target
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grep "^$module" $kernel/lib/modules/$version/modules.dep \
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| sed "s^$kernel^$out^g" \
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>> $out/lib/modules/$version/modules.dep
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done
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@ -11,21 +11,20 @@ rec {
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allPackages = import ./pkgs/top-level/all-packages.nix;
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};
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bash = pkgs.bash;
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# Determine the set of modules that we need to mount the root FS.
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modulesClosure = import ./modules-closure.nix {
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inherit (pkgs) stdenv kernel;
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rootModules = "ide-cd";
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inherit (pkgs) stdenv kernel module_init_tools;
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rootModules = ["ide-cd" "ide-disk" "ide-generic"];
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};
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# The init script of boot stage 1 (loading kernel modules for
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# mounting the root FS).
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bootStage1 = import ./boot-stage-1.nix {
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inherit (pkgs) genericSubstituter
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module_init_tools utillinux kernel;
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inherit (pkgs) genericSubstituter utillinux;
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inherit (pkgsDiet) module_init_tools;
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modules = modulesClosure;
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shell = stdenvLinuxStuff.bootstrapTools.bash;
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staticTools = stdenvLinuxStuff.staticTools;
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};
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