fcef0545be
configuration.nix. Right now it finds out the following:
- How many CPUs the machine has (for nix.maxJobs).
- Whether to load KVM support (either kvm-intel or kvm-amd).
- The modules necessary for the initrd by scanning the PCI and USB
busses. Only mass-storage and HID related modules are added.
svn path=/nixos/trunk/; revision=10221
145 lines
3.5 KiB
Bash
145 lines
3.5 KiB
Bash
#! @shell@ -e
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kernelModules=
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initrdKernelModules=
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hasCPUFeature() {
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local feature="$1"
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cat /proc/cpuinfo | grep -q "^flags.* $feature\( \|$\)"
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}
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needKernelModule() {
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kernelModules="$kernelModules \"$1\""
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}
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needInitrdKernelModule() {
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initrdKernelModules="$initrdKernelModules \"$1\""
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}
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# Detect the number of CPU cores.
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cpus="$(cat /proc/cpuinfo | grep '^processor' | wc -l)"
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# CPU frequency scaling. Not sure about this test.
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if hasCPUFeature "acpi"; then
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needKernelModule "acpi-cpufreq"
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fi
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# Virtualization support?
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if hasCPUFeature "vmx"; then
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needKernelModule "kvm-intel"
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fi
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if hasCPUFeature "svm"; then
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needKernelModule "kvm-amd"
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fi
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# Look at the PCI devices and add necessary modules. Note that most
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# modules are auto-detected so we don't need to list them here.
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# However, some are needed in the initrd to boot the system.
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pciCheck() {
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local path="$1"
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local vendor="$(cat $path/vendor)"
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local device="$(cat $path/device)"
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local class="$(cat $path/class)"
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local module
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if test -e "$path/driver/module"; then
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module=$(basename $(readlink -f $path/driver/module))
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fi
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echo "$path: $vendor $device $class $module"
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if test -n "$module"; then
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# See the bottom of http://pciids.sourceforge.net/pci.ids for
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# device classes.
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case $class in
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0x01*)
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# Mass-storage controller. Definitely important.
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needInitrdKernelModule $module
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;;
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0x0c00*)
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# Firewire controller. A disk might be attached.
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needInitrdKernelModule $module
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;;
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0x0c03*)
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# USB controller. Needed if we want to use the
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# keyboard when things go wrong in the initrd.
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needInitrdKernelModule $module
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;;
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esac
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fi
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}
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for path in /sys/bus/pci/devices/*; do
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pciCheck "$path"
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done
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# Idem for USB devices.
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usbCheck() {
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local path="$1"
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local class="$(cat $path/bInterfaceClass)"
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local subclass="$(cat $path/bInterfaceSubClass)"
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local protocol="$(cat $path/bInterfaceProtocol)"
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local module
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if test -e "$path/driver/module"; then
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module=$(basename $(readlink -f $path/driver/module))
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fi
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echo "$path: $class $subclass $protocol $module"
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if test -n "$module"; then
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# See http://www.linux-usb.org/usb.ids for
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# classes/subclasses/protocols.
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case $class:$subclass:$protocol in
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08:*)
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# Mass-storage controller. Definitely important.
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needInitrdKernelModule $module
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;;
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03:*:01)
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# Keyboard. Needed if we want to use the
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# keyboard when things go wrong in the initrd.
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needInitrdKernelModule $module
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;;
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esac
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fi
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}
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for path in /sys/bus/usb/devices/*; do
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if test -e "$path/bInterfaceClass"; then
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usbCheck "$path"
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fi
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done
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# Remove duplicate modules. !!! preserve order
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kernelModules=$(for i in $kernelModules; do echo $i; done | sort | uniq)
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initrdKernelModules=$(for i in $initrdKernelModules; do echo $i; done | sort | uniq)
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# Generation the configuration file.
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cat <<EOF
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# This is a generated file. Do not modify!
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# Make changes to /etc/nixos/configuration.nix instead.
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{
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boot = {
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initrd = {
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extraKernelModules = [ $(echo $initrdKernelModules) ];
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};
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kernelModules = [ $(echo $kernelModules) ];
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};
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nix = {
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maxJobs = $cpus;
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};
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}
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EOF
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