From 8002e2926c94ba482ce191f90defe28e8c0485b5 Mon Sep 17 00:00:00 2001
From: Jon Seager <jon@sgrs.uk>
Date: Wed, 9 Apr 2025 14:28:58 +0100
Subject: [PATCH] parca: add update script

---
 pkgs/by-name/pa/parca/package.nix |  5 +++
 pkgs/by-name/pa/parca/update.sh   | 53 +++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100755 pkgs/by-name/pa/parca/update.sh

diff --git a/pkgs/by-name/pa/parca/package.nix b/pkgs/by-name/pa/parca/package.nix
index a2dfc4668591..9f115f8dd184 100644
--- a/pkgs/by-name/pa/parca/package.nix
+++ b/pkgs/by-name/pa/parca/package.nix
@@ -68,6 +68,11 @@ buildGoModule rec {
     cp -r ${ui}/share/parca/ui/* ui/packages/app/web/build
   '';
 
+  passthru = {
+    inherit ui;
+    updateScript = ./update.sh;
+  };
+
   meta = {
     mainProgram = "parca";
     description = "Continuous profiling for analysis of CPU and memory usage";
diff --git a/pkgs/by-name/pa/parca/update.sh b/pkgs/by-name/pa/parca/update.sh
new file mode 100755
index 000000000000..a20292a935e0
--- /dev/null
+++ b/pkgs/by-name/pa/parca/update.sh
@@ -0,0 +1,53 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -I nixpkgs=./. -i bash -p curl jq git pnpm_9
+# shellcheck shell=bash
+set -euo pipefail
+nixpkgs="$(pwd)"
+cd $(readlink -e $(dirname "${BASH_SOURCE[0]}"))
+
+# Update the hash of the parca source code in the Nix expression.
+update_parca_source() {
+    local version; version="$1"
+    echo "Updating parca source"
+
+    old_version="$(nix eval --json --impure --expr "(import $nixpkgs/default.nix {}).parca.version" | jq -r)"
+    sed -i "s|${old_version}|${version}|g" package.nix
+
+    old_hash="$(nix eval --json --impure --expr "(import $nixpkgs/default.nix {}).parca.src.outputHash" | jq -r)"
+    new_hash="$(nix-build --impure --expr "let src = (import $nixpkgs/default.nix {}).parca.src; in (src.overrideAttrs or (f: src // f src)) (_: { outputHash = \"\"; outputHashAlgo = \"sha256\"; })" 2>&1 | tr -s ' ' | grep -Po "got: \K.+$")" || true
+
+    sed -i "s|${old_hash}|${new_hash}|g" package.nix
+}
+
+# Update the hash of the parca ui pnpm dependencies in the Nix expression.
+update_pnpm_deps_hash() {
+    echo "Updating parca ui pnpm deps hash"
+
+    old_hash="$(nix eval --json --impure --expr "(import $nixpkgs/default.nix {}).parca.ui.pnpmDeps.outputHash" | jq -r)"
+    new_hash="$(nix-build --impure --expr "let src = (import $nixpkgs/default.nix {}).parca.ui.pnpmDeps; in (src.overrideAttrs or (f: src // f src)) (_: { outputHash = \"\"; outputHashAlgo = \"sha256\"; })" 2>&1 | tr -s ' ' | grep -Po "got: \K.+$")" || true
+
+    sed -i "s|${old_hash}|${new_hash}|g" package.nix
+}
+
+# Update the hash of the parca go dependencies in the Nix expression.
+update_go_deps_hash() {
+    echo "Updating parca go deps hash"
+
+    old_hash="$(nix eval --json --impure --expr "(import $nixpkgs/default.nix {}).parca.vendorHash" | jq -r)"
+    new_hash="$(nix-build --impure --expr "let src = (import $nixpkgs/default.nix {}).parca; in (src.overrideAttrs { vendorHash = \"\"; })" 2>&1 | tr -s ' ' | grep -Po "got: \K.+$")" || true
+
+    sed -i "s|${old_hash}|${new_hash}|g" package.nix
+}
+
+LATEST_TAG="$(curl -s ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} https://api.github.com/repos/parca-dev/parca/releases/latest | jq -r '.tag_name')"
+LATEST_VERSION="$(expr "$LATEST_TAG" : 'v\(.*\)')"
+CURRENT_VERSION="$(nix eval --json --impure --expr "(import $nixpkgs/default.nix {}).parca.version" | jq -r)"
+
+if [[ "$CURRENT_VERSION" == "$LATEST_VERSION" ]]; then
+    echo "parca is up to date: ${CURRENT_VERSION}"
+    exit 0
+fi
+
+update_parca_source "$LATEST_VERSION"
+update_pnpm_deps_hash
+update_go_deps_hash