* Support adding the closure of a set of store paths to the ISO

image (along with an /init symlink for stage 2 of the boot
  process).

svn path=/nixu/trunk/; revision=6944

test/make-iso9660-image.nix

@@ -9,6 +9,15 @@
   # grafted in the file system at path `target'.
   contents
 
+, # In addition to `contents', the closure of the store paths listed
+  # in `packages' are also placed in the file system.
+  packages ? []
+
+, # `init' should be a store path, the closure of which is added to
+  # the image, just like `packages'.  However, in addition, a symlink
+  # `/init' to `init' will be created.
+  init ? null
+
   # Whether this should be an El-Torito bootable CD.
 , bootable ? false
 
@@ -23,6 +32,7 @@ stdenv.mkDerivation {
   name = "iso9660-image";
   builder = ./make-iso9660-image.sh;
   buildInputs = [cdrtools];
-  inherit isoName bootable bootImage;
+  inherit isoName packages init bootable bootImage;
-  graftList = map ({source, target}: target + "=" + source) contents;
+  sources = map ({source, target}: source) contents;
+  targets = map ({source, target}: target) contents;
 }

test/make-iso9660-image.sh

@@ -6,5 +6,26 @@ if test -n "$bootable"; then
     bootFlags="-b $bootImage -c boot.cat -no-emul-boot -boot-load-size 4"
 fi
 
+graftList=
+sources_=($sources)
+targets_=($targets)
+for ((i = 0; i < ${#targets_[@]}; i++)); do
+    graftList="$graftList ${targets_[$i]}=$(readlink -f ${sources_[$i]})"
+done
+
+# !!! Just as with make-initrd.nix, the call to Nix here needs to be
+# fixed.
+packagesClosure=$(/nix/bin/nix-store -qR $packages $init)
+
+for i in $packagesClosure; do
+    graftList="$graftList ${i:1}=$i"
+done
+
+if test -n "$init"; then
+    ln -s $init init
+    graftList="$graftList init=init"
+fi
+
 # !!! -f is a quick hack.
-mkisofs -r -J -f -o $out/$isoName $bootFlags -graft-points $graftList
+mkisofs -r -J -o $out/$isoName $bootFlags \
+    -graft-points $graftList

test/rescue-system.nix

@@ -76,6 +76,8 @@ rec {
         target = "isolinux/initrd";
       }
     ];
+
+    init = pkgs.bash + "/bin/sh";
     
     bootable = true;
     bootImage = "isolinux/isolinux.bin";