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nixpkgs/pkgs/applications/editors/eclipse/update.sh

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#!/usr/bin/env nix-shell
#! nix-shell -i bash --pure -p curl cacert libxml2 yq nix jq
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/3c7487575d9445185249a159046cc02ff364bff8.tar.gz
# ^
# |
# nixos-unstable ~ 2023-07-06 -----------------/
set -o errexit
set -o nounset
# scrape the downloads page for release info
curl -s -o eclipse-dl.html https://download.eclipse.org/eclipse/downloads/
trap "rm eclipse-dl.html" EXIT
dlquery() {
q=$1
xmllint --html eclipse-dl.html --xmlout 2>/dev/null | xq -r ".html.body.main.div.table[3].tr[1].td[0].a${q}";
}
# extract release info from download page HTML
platform_major=$(dlquery '."#text" | split(".") | .[0]' -r);
platform_minor=$(dlquery '."#text" | split(".") | .[1]' -r);
year=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[0:4]')
buildmonth=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[4:6]')
builddaytime=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[6:12]')
timestamp="${year}${buildmonth}${builddaytime}";
# account for possible release-month vs. build-month mismatches
month=$buildmonth;
case "$buildmonth" in
'02'|'04') month='03' ;;
'05'|'07') month='06' ;;
'08'|'10') month='09' ;;
'11'|'01') month='12' ;;
esac
cat <<EOF
paste the following into the 'let' block near the top of pkgs/applications/editors/eclipse/default.nix:
platform_major = "${platform_major}";
platform_minor = "${platform_minor}";
year = "${year}";
month = "${month}"; #release month
buildmonth = "${buildmonth}"; #sometimes differs from release month
timestamp = "\${year}\${buildmonth}${builddaytime}";
EOF
# strip existing download hashes
sed -i 's/64 = ".*";$/64 = "";/g' pkgs/applications/editors/eclipse/default.nix
# prefetch new download hashes
echo;
echo "paste the following url + hash blocks into pkgs/applications/editors/eclipse/default.nix:";
for url in $(grep 'url = ' pkgs/applications/editors/eclipse/default.nix | grep arch | cut -d '"' -f 2); do
u=$(echo "$url" | sed 's/&/\\&/g');
echo;
echo " url = \"${url}\";";
echo " hash = {";
for arch in x86_64 aarch64; do
us=$(eval echo "$u");
h=$(nix store prefetch-file --json "$us" | jq -r .hash);
echo " $arch = \"${h}\";";
done
echo ' }.${arch};';
done