1 files changed, 21 insertions, 0 deletions
diff --git a/pkgs/build-support/fetchurl/builder.sh b/pkgs/build-support/fetchurl/builder.sh
new file mode 100755
index 0000000000000..4560017220f93
--- /dev/null
+++ b/pkgs/build-support/fetchurl/builder.sh
@@ -0,0 +1,21 @@
+#! /bin/sh
+
+. $stdenv/setup
+
+echo "downloading $url into $out..."
+
+#prefetch=@prefix@/store/nix-prefetch-url-$md5
+prefetch=/nix/store/nix-prefetch-url-$md5
+if test -f "$prefetch"; then
+    echo "using prefetched $prefetch";
+    mv $prefetch $out || exit 1
+else
+    wget --passive-ftp "$url" -O "$out" || exit 1
+fi
+
+#actual=$(@bindir@/nix-hash --flat $out)
+actual=$(/nix/bin/nix-hash --flat $out)
+if test "$actual" != "$md5"; then
+    echo "hash is $actual, expected $md5"
+    exit 1
+fi