cassandra: Add updateScript

pkgs/servers/nosql/cassandra/3.0.nix

@@ -1,5 +1,4 @@
 { callPackage, ... } @ args:
-
 callPackage ./generic.nix (args // {
   version = "3.0.26";
   sha256 = "09wim1w2yizcqpja62jk64fhaw3jgnrgrjlrm4kgmcc3g3bsmw6i";

pkgs/servers/nosql/cassandra/3.11.nix

@@ -1,5 +1,4 @@
 { callPackage, ... } @ args:
-
 callPackage ./generic.nix (args // {
   version = "3.11.12";
   sha256 = "16j58l7r47qrfh8q7fm92y935ykgvnbj3qn984c42qda15x92hkw";

pkgs/servers/nosql/cassandra/generic.nix

@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     inherit sha256;
-    url = "mirror://apache/cassandra/${version}/apache-${pname}-${version}-bin.tar.gz";
+    url = "mirror://apache/cassandra/${version}/apache-cassandra-${version}-bin.tar.gz";
   };
 
   nativeBuildInputs = [ makeWrapper coreutils ];
@@ -113,6 +113,8 @@ stdenv.mkDerivation rec {
           assert test.testPackage.version == version;
           test;
       };
+
+    updateScript = ./update.sh;
   };
 
   meta = with lib; {

pkgs/servers/nosql/cassandra/update.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash
+#!nix-shell -p git
+
+cd "$(dirname "$0")"
+set -eux -o pipefail
+
+tmp="$(mktemp -d)"
+cleanup() {
+  rm -rf "$tmp"
+}
+trap cleanup EXIT
+
+# get numeric-only versions, sort them latest first
+git ls-remote --tags https://github.com/apache/cassandra \
+  | awk '{ if (match($0, /refs.tags.cassandra-([0-9.]*)$/, m)) print m[1] }' \
+  | sort -V \
+  | tac >$tmp/versions
+
+version="$(grep -E '3[.]11[.]' <$tmp/versions | head -n 1)"
+hash="$(nix-prefetch-url "mirror://apache/cassandra/${version}/apache-cassandra-${version}-bin.tar.gz")"
+cat >3.11.nix <<EOF
+# GENERATED BY update.sh
+{ callPackage, ... } @ args:
+callPackage ./generic.nix (args // {
+  version = "$version";
+  sha256 = "$hash";
+  generation = "3_11";
+})
+EOF
+
+version="$(grep -E '3[.]0[.]' <$tmp/versions | head -n 1)"
+hash="$(nix-prefetch-url "mirror://apache/cassandra/${version}/apache-cassandra-${version}-bin.tar.gz")"
+cat >3.0.nix <<EOF
+# GENERATED BY update.sh
+{ callPackage, ... } @ args:
+callPackage ./generic.nix (args // {
+  version = "$version";
+  sha256 = "$hash";
+  generation = "3_0";
+})
+EOF