diff --git a/pkgs/applications/networking/browsers/chromium/update.sh b/pkgs/applications/networking/browsers/chromium/update.sh
index 066cd1c147f..c9dd69df9a2 100755
--- a/pkgs/applications/networking/browsers/chromium/update.sh
+++ b/pkgs/applications/networking/browsers/chromium/update.sh
@@ -1,34 +1,50 @@
 #!/bin/sh
 
+channels_url="http://omahaproxy.appspot.com/";
 bucket_url="http://commondatastorage.googleapis.com/chromium-browser-official/";
+output_file="$(cd "$(dirname "$0")" && pwd)/sources.nix";
 
-get_newest_version()
+get_channels()
 {
-    curl -s "$bucket_url" | sed -ne ' H;/<[Kk][Ee][Yy]>chromium-[^<]*</h;${
-    g;s/^.*<Key>chromium-\([^<.]\+\(\.[^<.]\+\)\+\)\.tar\.bz2<.*$/\1/p
-    }';
+    for chline in $(echo "$1" | cut -d, -f-2);
+    do
+        channel="${chline%%,*}";
+        version="${chline##*,}";
+
+        url="${bucket_url%/}/chromium-$version.tar.bz2";
+
+        sha256="$(nix-prefetch-url "$url")";
+
+        echo "  $channel = {";
+        echo "    version = \"$version\";";
+        echo "    url = \"$url\";";
+        echo "    sha256 = \"$sha256\";";
+        echo "  };";
+    done;
 }
 
 cd "$(dirname "$0")";
 
-version="$(get_newest_version)";
+versions="$(curl -s "$channels_url" | sed -n -e 's/^linux,\(\([^,]\+,\)\{2\}\).*$/\1/p')";
 
-if [ -e source.nix ]; then
-    oldver="$(sed -n 's/^ *version *= *"\([^"]\+\)".*$/\1/p' source.nix)";
-    if [ "x$oldver" = "x$version" ]; then
-        echo "Already the newest version: $version" >&2;
+if [ -e "$output_file" ];
+then
+    vhash="$(echo "$versions" | sha256sum | cut -d' ' -f1)";
+    old_vhash="$(sed -n 's/# *VHASH: *//p' "$output_file")";
+
+    if [ "x$vhash" = "x$old_vhash" ];
+    then
+        echo "$output_file is already up to date, bailing out." >&2;
         exit 1;
     fi;
 fi;
 
-url="${bucket_url%/}/chromium-$version.tar.bz2";
+channels="$(get_channels "$versions")";
 
-sha256="$(nix-prefetch-url "$url")";
-
-cat > source.nix <<EOF
+cat > "$output_file" <<-EOF
+# This file is autogenerated from update.sh in the same directory.
+# VHASH: $vhash
 {
-  version = "$version";
-  url = "$url";
-  sha256 = "$sha256";
+$channels
 }
 EOF