feat(build): Print config logs on build failure if debug verbosity enabled

This improves diagnosability for failed builds by surfacing relevant logs automatically when debug verbosity is enabled, reducing the need for manual inspection.

Author: jhheider

build/build.ts

@@ -6,7 +6,7 @@ import fix_up from "brewkit/porcelain/fix-up.ts"
 import { Command } from "cliffy/command/mod.ts"
 import fetch from "brewkit/porcelain/fetch.ts"
 import get_config, { platform_cache } from "brewkit/config.ts"
-import { Path, hooks, utils } from "pkgx"
+import { Path, hooks, utils, Verbosity, verbosity } from "pkgx"
 import * as YAML from "deno/yaml/mod.ts"
 const { useConfig } = hooks
 const { host } = utils
@@ -134,7 +134,23 @@ platform_cache(() => config.path.home).mkdir('p')  // we’ve indeed found thing
 
 const proc = new Deno.Command(script.string, {clearEnv: true, env}).spawn()
 const rv = await proc.status
-if (!rv.success) throw new Error(`UR BUILD FAILED WITH CODE ${rv.code} & SIGNAL ${rv.signal}`)
+if (!rv.success) {
+  // if DEBUG=1 or RUNNER_DEBUG=1, we’ll see the config tool output in the logs
+  if (verbosity >= Verbosity.debug) {
+    const wanted = new Set(['config.log', 'CMakeError.log', 'CMakeOutput.log', 'meson-log.txt'])
+    try {
+      console.debug("\n==== CONFIG LOGS ====")
+      for await (const [path, { isFile }] of config.path.build.walk()) {
+        if (isFile && wanted.has(path.basename())) {
+          console.debug(`==== START ${path} ====`)
+          console.debug(await path.read())
+          console.debug(`==== END ${path} ====`)
+        }
+      }
+    } catch { console.warn("failed to read config logs") }
+  }
+  throw new Error(`UR BUILD FAILED WITH CODE ${rv.code} & SIGNAL ${rv.signal}`)
+}
 
 /// move installation products to destination
 await gum(`rsync install to final path`)

lib/pkgx.ts

@@ -34,9 +34,9 @@ export enum Verbosity {
   trace = 3
 }
 
-(() => {
-  const verbosity = getVerbosity(Deno.env.toObject())
+export const verbosity = getVerbosity(Deno.env.toObject())
 
+;(() => {
   function noop() {}
   if (verbosity < Verbosity.debug) console.debug = noop
   if (verbosity < Verbosity.normal) {