some NIX_ROOT fixes

svn path=/nixpkgs/trunk/; revision=6015

pkgs/misc/nix-unstable/default.nix

@@ -16,4 +16,8 @@ stdenv.mkDerivation {
   };
   buildInputs = [aterm bdb perl curl];
   inherit storeDir stateDir aterm bdb;
+
+  # uncomment if you want to be able to use nix-prefetch-url when NIX_ROOT
+  # is set
+  #patches = [./nix-0.10pre5679.patch];
 }

pkgs/misc/nix-unstable/nix-0.10pre5679.patch

@@ -0,0 +1,25 @@
+diff -ruN nix-0.10pre5679/scripts/nix-prefetch-url.in nix-0.10pre5679.new/scripts/nix-prefetch-url.in
+--- nix-0.10pre5679/scripts/nix-prefetch-url.in	2006-07-11 13:24:20.000000000 +0200
++++ nix-0.10pre5679.new/scripts/nix-prefetch-url.in	2006-08-01 11:54:02.000000000 +0200
+@@ -39,10 +39,10 @@
+ 
+     tmpPath=/tmp/nix-prefetch-url-$$ # !!! security?
+     tmpFile=$tmpPath/$name
+-    mkdir $tmpPath
++    mkdir -p $NIX_ROOT/$tmpPath
+ 
+     # Perform the download.
+-    @curl@ --fail --location --max-redirs 20 "$url" > $tmpFile
++    @curl@ --fail --location --max-redirs 20 "$url" > $NIX_ROOT/$tmpFile
+ 
+     # Compute the hash.
+     hash=$(@bindir@/nix-hash --type "$hashType" $hashFormat --flat $tmpFile)
+@@ -51,7 +51,7 @@
+     # Add the downloaded file to the Nix store.
+     finalPath=$(@bindir@/nix-store --add-fixed "$hashType" $tmpFile)
+ 
+-    if test -n "$tmpPath"; then rm -rf $tmpPath || true; fi
++    if test -n "$NIX_ROOT/$tmpPath"; then rm -rf $NIX_ROOT/$tmpPath || true; fi
+ 
+     if test -n "$expHash" -a "$expHash" != "$hash"; then
+         echo "hash mismatch for URL \`$url'"