nixpkgs/maintainers/scripts/evacuate-urls.sh

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#! /bin/sh -e
find . -name "*.nix" | while read fn; do
grep -E '^ *url = ' "$fn" | while read line; do
if oldURL=$(echo "$line" | sed 's^url = \(.*\);^\1^'); then
if ! echo "$oldURL" | grep -q -E ".cs.uu.nl|.stratego-language.org|java.sun.com|ut2004|linuxq3a|RealPlayer|Adbe"; then
base=$(basename $oldURL)
newURL="http://catamaran.labs.cs.uu.nl/dist/tarballs/$base"
newPath="/mnt/scratchy/eelco/public_html/tarballs/$base"
echo "$fn: $oldURL -> $newURL"
if ! test -e "$newPath"; then
curl --fail --location --max-redirs 20 "$oldURL" > "$newPath".tmp
mv -f "$newPath".tmp "$newPath"
fi
sed "s^$oldURL^$newURL^" < "$fn" > "$fn".tmp
mv -f "$fn".tmp "$fn"
fi
fi
done
done