measureme: add update script

pkgs/by-name/me/measureme/package.nix

@@ -21,6 +21,8 @@ rustPlatform.buildRustPackage rec {
     ln -s ${./Cargo.lock} Cargo.lock
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = with lib; {
     description = "Support crate for rustc's self-profiling feature";
     homepage = "https://github.com/rust-lang/measureme";

pkgs/by-name/me/measureme/update.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p nix jq gnused curl nix-prefetch-git cargo
+
+set -eu -o pipefail
+
+package_dir="$(dirname "${BASH_SOURCE[0]}")"
+
+echo "Fetching latest version"
+version=$(curl -sfL ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} https://api.github.com/repos/rust-lang/measureme/releases/latest | jq -r '.tag_name')
+
+echo "Latest version is $version"
+if [[ "$UPDATE_NIX_OLD_VERSION" == "$version" ]]; then
+    echo "Already up to date!"
+    exit 0
+fi
+
+echo "Fetching source hash"
+hash="$(nix-prefetch-git https://github.com/rust-lang/measureme.git --quiet --rev "refs/tags/$version" | jq -r '.hash')"
+
+tmp=$(mktemp -d)
+trap "rm -rf $tmp" EXIT
+
+git clone --depth 1 --branch "$version" https://github.com/rust-lang/measureme.git "$tmp"
+pushd "$tmp"
+echo "Generating Cargo.lock"
+cargo update
+cp "Cargo.lock" "$package_dir/Cargo.lock"
+popd
+
+sed -i "s#hash = \".*\";#hash = \"$hash\";#g" "$package_dir/package.nix"
+sed -i "s#version = \".*\";#version = \"$version\";#g" "$package_dir/package.nix"