pkgs/update-from-hydra: Add script that updates paths based on hydra builds

pkgs/overlay.nix

@@ -8,6 +8,7 @@ self: super: {
   nixfiles-update-ssh-host-keys = self.callPackage ./nixfiles/nixfiles-update-ssh-host-keys.nix {};
   pyexcel-xlsx = self.python3.pkgs.callPackage ./pyexcel-xlsx {};
   pyexcel-webio = self.python3.pkgs.callPackage ./pyexcel-webio {};
+  update-from-hydra = self.callPackage ./update-from-hydra {};
   uptimestatus = self.python3.pkgs.callPackage ./uptimestatus {};
   wetter = self.python3.pkgs.callPackage ./wetter {
     inherit (self) pkg-config libsass;

pkgs/update-from-hydra/default.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.writeShellApplication {
+  name = "update-from-hydra";
+  text = builtins.readFile ./update-from-hydra.sh;
+  runtimeInputs = with pkgs; [
+    curl
+    jq
+    nix
+  ];
+}
+

pkgs/update-from-hydra/update-from-hydra.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+while [[ $# -gt 0 ]]; do
+	case $1 in
+		--hydra-url)
+			HYDRA_URL="$2"
+			shift
+			shift
+			;;
+		--hydra-project)
+			HYDRA_PROJECT="$2"
+			shift
+			shift
+			;;
+		--hydra-jobset)
+			HYDRA_JOBSET="$2"
+			shift
+			shift
+			;;
+		--hydra-job)
+			HYDRA_JOB="$2"
+			shift
+			shift
+			;;
+		--nix-store-uri)
+			NIX_STORE_URI="$2"
+			shift
+			shift
+			;;
+		--gcroot-name)
+			GCROOT_NAME="$2"
+			shift
+			shift
+			;;
+		-*)
+			echo "Unknown option $1"
+			exit 1
+			;;
+		*)
+			ARGS+=("$1")
+			shift
+			;;
+	esac
+done
+
+set -- "${ARGS[@]}"
+
+HYDRA_JOB_URL="${HYDRA_URL}/job/${HYDRA_PROJECT}/${HYDRA_JOBSET}/${HYDRA_JOB}/latest-finished"
+RESULT_PATH="$1"
+
+echo "Updating ${RESULT_PATH} from ${HYDRA_PROJECT}:${HYDRA_JOBSET}:${HYDRA_JOB}"
+
+echo "Make sure symlink directory exist"
+mkdir -p "$(dirname "${RESULT_PATH}")"
+
+echo "Fetching job output"
+STORE_PATH="$(curl -s -L -H "Accept: application/json" "${HYDRA_JOB_URL}" | jq -r .buildoutputs.out.path)"
+
+echo "Copying path"
+nix copy --from "${NIX_STORE_URI}" "${STORE_PATH}"
+
+echo "Activate path"
+ln -fsn "${STORE_PATH}" "${RESULT_PATH}"
+
+if [[ -n $GCROOT_NAME ]]; then
+	GCROOT_PATH="/nix/var/nix/gcroots/update-from-hydra/${GCROOT_NAME}"
+	echo "Add to gcroot ${GCROOT_PATH}"
+	mkdir -p "$(dirname "${GCROOT_PATH}")"
+
+	ln -fsn "${RESULT_PATH}" "${GCROOT_PATH}"
+fi
+