nixpkgs/pkgs/development/compilers/gcc-4.4/update-gcc.sh

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#!/bin/sh
if [ $# -ne 1 ]
then
echo "Usage: $(basename $0) VERSION"
echo
echo "Download and GPG-check component tarballs for GCC VERSION."
exit 1
fi
version="$1"
set -e
out="sources.nix"
declare -A options
options["core"]="/* langC */ true"
options["g++"]="langCC"
options["fortran"]="langFortran"
options["java"]="langJava"
cat > "$out"<<EOF
/* Automatically generated by \`$(basename $0)', do not edit.
For GCC ${version}. */
{ fetchurl, optional, version, langC, langCC, langFortran, langJava }:
assert version == "${version}";
EOF
for component in core g++ fortran java
do
dir="ftp.gnu.org/gnu/gcc/gcc-${version}"
file="gcc-${component}-${version}.tar.bz2"
url="${dir}/${file}"
path_and_hash="$(nix-prefetch-url "$url" 2>&1 | grep -E '^(hash|path) is')"
path="$(echo $path_and_hash | sed -e's/^.*path is \([^ ]\+\).*$/\1/g')"
hash="$(echo $path_and_hash | sed -e's/^.*hash is \([^ ]\+\).*$/\1/g')"
rm -f "${url}.sig"
wget "${url}.sig"
gpg --verify "${file}.sig" "${path}"
rm "${file}.sig"
cat >> "$out" <<EOF
optional ${options[$component]} (fetchurl {
url = "mirror://gcc/releases/gcc-\${version}/gcc-${component}-\${version}.tar.bz2";
sha256 = "${hash}";
}) ++
EOF
done
cat >> "$out" <<EOF
[]
EOF
echo "result stored in \`$out'"