223 lines
6.9 KiB
Nix
223 lines
6.9 KiB
Nix
# generate the script used to activate the configuration.
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{pkgs, config, ...}:
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let
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inherit (pkgs.lib) mkOption mergeTypedOption mergeAttrs mapRecordFlatten
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mapAttrs addErrorContext fold id filter textClosureMap noDepEntry
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fullDepEntry;
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inherit (builtins) attrNames;
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addAttributeName = mapAttrs (a: v: v // {
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text = ''
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#### actionScripts snippet ${a} :
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# ========================================
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${v.text}
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'';
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});
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defaultScripts = {
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systemConfig = noDepEntry ''
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systemConfig="$1"
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if test -z "$systemConfig"; then
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systemConfig="/system" # for the installation CD
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fi
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'';
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defaultPath =
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let path = [
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pkgs.coreutils pkgs.gnugrep pkgs.findutils
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pkgs.glibc # needed for getent
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pkgs.pwdutils
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pkgs.nettools # needed for hostname
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]; in noDepEntry ''
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export PATH=/empty
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for i in ${toString path}; do
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PATH=$PATH:$i/bin:$i/sbin;
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done
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'';
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stdio = fullDepEntry ''
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# Needed by some programs.
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ln -sfn /proc/self/fd /dev/fd
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ln -sfn /proc/self/fd/0 /dev/stdin
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ln -sfn /proc/self/fd/1 /dev/stdout
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ln -sfn /proc/self/fd/2 /dev/stderr
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'' [
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"defaultPath" # path to ln
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];
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binsh = fullDepEntry ''
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# Create the required /bin/sh symlink; otherwise lots of things
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# (notably the system() function) won't work.
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mkdir -m 0755 -p $mountPoint/bin
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ln -sfn ${config.system.build.binsh}/bin/sh $mountPoint/bin/sh
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'' [
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"defaultPath" # path to ln & mkdir
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"stdio" # ?
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];
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modprobe = fullDepEntry ''
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# Allow the kernel to find our wrapped modprobe (which searches
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# in the right location in the Nix store for kernel modules).
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# We need this when the kernel (or some module) auto-loads a
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# module. This is only done at boot time to make sure that we
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# don't use modules that don't match the running kernel.
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# !!! We should check whether the new kernel modules are
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# compatible with the running kernel so that we can upgrade
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# kernel modules (e.g. the NVIDIA driver) in a running system.
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if [ "$(cat /proc/sys/kernel/modprobe)" = "/sbin/modprobe" ]; then
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echo ${config.system.sbin.modprobe}/sbin/modprobe > /proc/sys/kernel/modprobe
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fi
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'' [
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# ?
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];
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var = fullDepEntry ''
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# Various log/runtime directories.
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mkdir -m 0755 -p /var/run
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mkdir -m 0755 -p /var/run/console # for pam_console
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touch /var/run/utmp # must exist
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chmod 644 /var/run/utmp
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mkdir -m 0755 -p /var/run/nix/current-load # for distributed builds
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mkdir -m 0700 -p /var/run/nix/remote-stores
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mkdir -m 0755 -p /var/log
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touch /var/log/wtmp # must exist
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chmod 644 /var/log/wtmp
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touch /var/log/lastlog
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chmod 644 /var/log/lastlog
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mkdir -m 1777 -p /var/tmp
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# Empty, read-only home directory of many system accounts.
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mkdir -m 0555 -p /var/empty
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'' [
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"defaultPath" # path to mkdir & touch & chmod
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];
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rootPasswd = fullDepEntry ''
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# If there is no password file yet, create a root account with an
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# empty password.
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if ! test -e /etc/passwd; then
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rootHome=/root
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touch /etc/passwd; chmod 0644 /etc/passwd
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touch /etc/group; chmod 0644 /etc/group
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touch /etc/shadow; chmod 0600 /etc/shadow
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# Can't use useradd, since it complains that it doesn't know us
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# (bootstrap problem!).
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echo "root:x:0:0:System administrator:$rootHome:${config.users.defaultUserShell}" >> /etc/passwd
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echo "root::::::::" >> /etc/shadow
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echo | passwd --stdin root
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fi
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'' [
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"defaultPath" # path to touch & passwd
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"etc" # for /etc
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# ?
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];
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nix = fullDepEntry ''
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# Set up Nix.
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mkdir -p /nix/etc/nix
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ln -sfn /etc/nix.conf /nix/etc/nix/nix.conf
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chown root.nixbld /nix/store
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chmod 1775 /nix/store
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# Nix initialisation.
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mkdir -m 0755 -p \
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/nix/var/nix/gcroots \
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/nix/var/nix/temproots \
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/nix/var/nix/manifests \
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/nix/var/nix/userpool \
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/nix/var/nix/profiles \
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/nix/var/nix/db \
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/nix/var/log/nix/drvs \
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/nix/var/nix/channel-cache \
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/nix/var/nix/chroots
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mkdir -m 1777 -p /nix/var/nix/gcroots/per-user
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mkdir -m 1777 -p /nix/var/nix/profiles/per-user
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ln -sf /nix/var/nix/profiles /nix/var/nix/gcroots/
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ln -sf /nix/var/nix/manifests /nix/var/nix/gcroots/
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'' [
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"defaultPath"
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"etc" # /etc/nix.conf
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"users" # nixbld group
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];
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hostname = fullDepEntry ''
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# Set the host name. Don't clear it if it's not configured in the
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# NixOS configuration, since it may have been set by dhclient in the
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# meantime.
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${if config.networking.hostName != "" then
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''hostname "${config.networking.hostName}"''
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else ''
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# dhclient won't do anything if the hostname isn't empty.
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if test "$(hostname)" = "(none)"; then
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hostname ""
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fi
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''}
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'' [ "defaultPath" ];
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# The activation has to be done at the end. This is forced at the apply
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# function of activationScripts option
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activate = noDepEntry ''
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# Make this configuration the current configuration.
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# The readlink is there to ensure that when $systemConfig = /system
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# (which is a symlink to the store), /var/run/current-system is still
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# used as a garbage collection root.
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ln -sfn "$(readlink -f "$systemConfig")" /var/run/current-system
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# Prevent the current configuration from being garbage-collected.
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ln -sfn /var/run/current-system /nix/var/nix/gcroots/current-system
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'';
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};
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in
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{
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require = {
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system = {
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activationScripts = mkOption {
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default = [];
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example = {
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stdio = {
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text = "
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# Needed by some programs.
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ln -sfn /proc/self/fd /dev/fd
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ln -sfn /proc/self/fd/0 /dev/stdin
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ln -sfn /proc/self/fd/1 /dev/stdout
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ln -sfn /proc/self/fd/2 /dev/stderr
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";
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deps = [];
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};
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};
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description = ''
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Activate the new configuration (i.e., update /etc, make accounts,
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and so on).
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'';
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merge = mergeTypedOption "script" builtins.isAttrs (fold mergeAttrs {});
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apply = set:
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let withHeadlines = addAttributeName set;
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activateLib = removeAttrs withHeadlines ["activate"];
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activateLibNames = attrNames activateLib;
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in {
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script = pkgs.writeScript "nixos-activation-script"
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("#! ${pkgs.stdenv.shell}\n"
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+ textClosureMap id activateLib activateLibNames + "\n"
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# make sure that the activate snippet is added last.
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+ withHeadlines.activate.text);
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};
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};
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};
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};
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system.activationScripts = defaultScripts;
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}
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