From 4ff6821a03680ad92db08701555be3a6f5c735e3 Mon Sep 17 00:00:00 2001
From: Marc Weber <marco-oweber@gmx.de>
Date: Thu, 17 Dec 2009 06:04:36 +0000
Subject: [PATCH] module creating /sbin/init

svn path=/nixos/trunk/; revision=19009
---
 .../init-script/init-script-builder.sh        | 89 +++++++++++++++++++
 modules/installer/init-script/init-script.nix | 51 +++++++++++
 modules/module-list.nix                       |  1 +
 .../activation/switch-to-configuration.sh     |  2 +
 modules/system/activation/top-level.nix       |  1 +
 5 files changed, 144 insertions(+)
 create mode 100644 modules/installer/init-script/init-script-builder.sh
 create mode 100644 modules/installer/init-script/init-script.nix

diff --git a/modules/installer/init-script/init-script-builder.sh b/modules/installer/init-script/init-script-builder.sh
new file mode 100644
index 000000000000..24128ae9abc9
--- /dev/null
+++ b/modules/installer/init-script/init-script-builder.sh
@@ -0,0 +1,89 @@
+
+#! @bash@/bin/sh -e
+
+shopt -s nullglob
+
+export PATH=/empty
+for i in @path@; do PATH=$PATH:$i/bin; done
+
+if test $# -ne 1; then
+    echo "Usage: grub-menu-builder.sh DEFAULT-CONFIG"
+    exit 1
+fi
+
+defaultConfig="$1"
+
+
+[ "$(stat -f -c '%i' /)" = "$(stat -f -c '%i' /boot)" ] || {
+  # see grub-menu-builder.sh
+  echo "WARNING: /boot being on a different filesystem not supported by init-script-builder.sh"
+}
+
+
+
+target="/sbin/init"
+targetOther="/boot/init-other-configurations-contents.txt"
+
+tmp="$target.tmp"
+tmpOther="$targetOther.tmp"
+
+
+configurationCounter=0
+numAlienEntries=`cat <<EOF | egrep '^[[:space:]]*title' | wc -l
+@extraEntries@
+EOF`
+
+
+
+
+# Add an entry to $targetOther
+addEntry() {
+    local name="$1"
+    local path="$2"
+    local shortSuffix="$3"
+
+    configurationCounter=$((configurationCounter + 1))
+
+    local stage2=$(readlink $path/init)
+
+    content="$(
+      echo "#!/bin/sh"
+      echo "# $name"
+      echo "# created by init-script-builder.sh"
+      echo "export systemConfig=$(readlink -f $path)"
+      echo "exec $stage2"
+    )"
+
+    [ "$path" != "$defaultConfig" ] || { 
+      echo "$content" > $tmp
+      echo "# older configurations: $targetOther" >> $tmp
+      chmod +x $tmp
+    }
+
+    echo -e "$content\n\n" >> $tmpOther
+}
+
+
+mkdir -p /boot /sbin
+
+addEntry "NixOS - Default" $defaultConfig ""
+
+# Add all generations of the system profile to the menu, in reverse
+# (most recent to least recent) order.
+for link in $((ls -d $defaultConfig/fine-tune/* ) | sort -n); do
+    date=$(stat --printf="%y\n" $link | sed 's/\..*//')
+    addEntry "NixOS - variation" $link ""
+done
+
+for generation in $(
+    (cd /nix/var/nix/profiles && ls -d system-*-link) \
+    | sed 's/system-\([0-9]\+\)-link/\1/' \
+    | sort -n -r); do
+    link=/nix/var/nix/profiles/system-$generation-link
+    date=$(stat --printf="%y\n" $link | sed 's/\..*//')
+    kernelVersion=$(cd $(dirname $(readlink -f $link/kernel))/lib/modules && echo *)
+    addEntry "NixOS - Configuration $generation ($date - $kernelVersion)" $link "$generation ($date)"
+done
+
+mv $tmpOther $targetOther
+mv $tmp $target
diff --git a/modules/installer/init-script/init-script.nix b/modules/installer/init-script/init-script.nix
new file mode 100644
index 000000000000..ff656b1c4429
--- /dev/null
+++ b/modules/installer/init-script/init-script.nix
@@ -0,0 +1,51 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  initScriptBuilder = pkgs.substituteAll {
+    src = ./init-script-builder.sh;
+    isExecutable = true;
+    inherit (pkgs) bash;
+    path = [pkgs.coreutils pkgs.gnused pkgs.gnugrep];
+  };
+  
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    boot.loader.initScript = {
+
+      enable = mkOption {
+        default = true;
+        description = ''
+          Some systems require a /sbin/init script which is started.
+          Or having it makes starting NixOS easier.
+          This applies to some kind of hosting services and user mode linux.
+
+          Additionaly this script will create
+          /boot/init-other-configurations-contents.txt containing
+          contents of remaining configurations. You can copy paste them into
+          /sbin/init manually running a recue system or such.
+        '';
+      };
+    };
+
+  };
+  
+
+  ###### implementation
+
+  config = {
+  
+    system.build.initScriptBuilder =
+       if config.boot.loader.initScript.enable then initScriptBuilder else "";
+
+  };
+  
+}
diff --git a/modules/module-list.nix b/modules/module-list.nix
index 62f8638020cb..702822f506ab 100644
--- a/modules/module-list.nix
+++ b/modules/module-list.nix
@@ -15,6 +15,7 @@
   ./hardware/network/rt73.nix 
   ./hardware/pcmcia.nix
   ./installer/grub/grub.nix
+  ./installer/init-script/init-script.nix
   ./installer/generations-dir/generations-dir.nix
   ./installer/tools/nixos-checkout.nix
   ./installer/tools/tools.nix
diff --git a/modules/system/activation/switch-to-configuration.sh b/modules/system/activation/switch-to-configuration.sh
index 86775ad62a81..2a8e29bb841d 100644
--- a/modules/system/activation/switch-to-configuration.sh
+++ b/modules/system/activation/switch-to-configuration.sh
@@ -49,6 +49,8 @@ if [ "$action" = "switch" -o "$action" = "boot" ]; then
     else
           echo "Warning: don't know how to make this configuration bootable; please enable a boot loader." 1>&2
     fi
+
+    @initScriptBuilder@ @out@
 fi
 
 # Activate the new configuration.
diff --git a/modules/system/activation/top-level.nix b/modules/system/activation/top-level.nix
index d2c20e909293..2fdaa6fd945a 100644
--- a/modules/system/activation/top-level.nix
+++ b/modules/system/activation/top-level.nix
@@ -108,6 +108,7 @@ let
     kernelParams =
       config.boot.kernelParams ++ config.boot.extraKernelParams;
     menuBuilder = config.system.build.menuBuilder;
+    initScriptBuilder = config.system.build.initScriptBuilder;
     # Most of these are needed by grub-install.
     path = [
       pkgs.coreutils