Add scripts to check the status of nix_builder.

nix/configuration/roles/hydra/default.nix

@@ -10,6 +10,19 @@
   ...
 }:
 
+let
+  patchScriptBin =
+    filename: contents:
+    ((pkgs.writeScriptBin filename contents).overrideAttrs (old: {
+      buildCommand = "${old.buildCommand}\n patchShebangs $out";
+    }));
+  cache_status_full = (
+    patchScriptBin "cache_status_full" (builtins.readFile ./files/cache_status_full.bash)
+  );
+  cache_status_latest = (
+    patchScriptBin "cache_status_latest" (builtins.readFile ./files/cache_status_latest.bash)
+  );
+in
 {
   imports = [ ];
 
@@ -26,6 +39,8 @@
     environment.systemPackages = with pkgs; [
       nix_builder.packages.x86_64-linux.default
       sqlite # For manually inspecting the database.
+      cache_status_full
+      cache_status_latest
     ];
 
     environment.persistence."/persist" = lib.mkIf (config.me.mountPersistence) {

nix/configuration/roles/hydra/files/cache_status_full.bash

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+#
+# Shows the status of all builds in nix_builder.
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+doas -u nixworker env NIX_REMOTE='local?root=/.disk/root' RUST_BACKTRACE=1 RUST_LOG=nix_builder=DEBUG sqlite3 -header -box /home/nixworker/persist/nix_builder/nix_builder.sqlite "select * from (select build.id, datetime(build.start_time, 'unixepoch') as start_time, datetime(build.end_time, 'unixepoch') as end_time, build.status, build.target, flake_inputs.rev from build left outer join flake_inputs on build.id=flake_inputs.build_id and flake_inputs.input_name='nixpkgs' order by build.id desc
+limit 45) order by id asc;"

nix/configuration/roles/hydra/files/cache_status_latest.bash

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+#
+# Shows the status of all builds in nix_builder.
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+doas -u nixworker env NIX_REMOTE='local?root=/.disk/root' RUST_BACKTRACE=1 RUST_LOG=nix_builder=DEBUG sqlite3 -header -box /home/nixworker/persist/nix_builder/nix_builder.sqlite "select * from (select build.id, datetime(build.start_time, 'unixepoch') as start_time, datetime(build.end_time, 'unixepoch') as end_time, build.status, build.target, flake_inputs.rev from build left outer join flake_inputs on build.id=flake_inputs.build_id and flake_inputs.input_name='nixpkgs' order by build.id desc
+limit 45) order by id asc;"