nix-super/corepkgs/fetchurl/fetchurl.sh
Eelco Dolstra 249988a787 * Allow the output/expression id to be forced to a certain
value; this potentially dangerous feature enables better 
  sharing for those paths for which the content is known in 
  advance (e.g., because a content hash is given).
* Fast builds: if we can expand all output paths of a derive 
  expression, we don't have to build.
2003-07-21 20:07:12 +00:00

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#! /bin/sh
echo "downloading $url into $out..."
wget "$url" -O "$out" || exit 1
actual=$(md5sum -b $out | cut -c1-32)
if ! test "$actual" == "$md5"; then
echo "hash is $actual, expected $md5"
exit 1
fi