diff --git a/action.yml b/action.yml
index 2aa828b..dc1e7a3 100644
--- a/action.yml
+++ b/action.yml
@@ -4,6 +4,10 @@ branding:
   color: "purple"
 description: "Free, no-configuration Nix cache. Cut CI time by 50% or more by caching to GitHub Actions' cache."
 inputs:
+  use-gha-cache:
+    description: "Whether to upload build results to the GitHub Actions cache."
+    default: true
+    required: false
   listen:
     description: The host and port to listen on.
     default: 127.0.0.1:37515
@@ -19,6 +23,7 @@ inputs:
   source-pr:
     description: The PR of `magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
+    default: 1
   source-revision:
     description: The revision of `nix-magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
@@ -31,6 +36,16 @@ inputs:
   diagnostic-endpoint:
     description: "Diagnostic endpoint url where diagnostics and performance data is sent. To disable set this to an empty string."
     default: "https://install.determinate.systems/magic-nix-cache/perf"
+  use-flakehub:
+    description: "Whether to upload build results to FlakeHub."
+    default: true
+    required: false
+  flakehub-cache-server:
+    description: "The FlakeHub binary cache server."
+    default: "https://attic-test.fly.dev"
+  flakehub-api-server:
+    description: "The FlakeHub API server."
+    default: "https://api.flakehub.com"
 
 runs:
   using: "node16"
diff --git a/bun.lockb b/bun.lockb
index 93764e1..5f50faf 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/dist/index.js b/dist/index.js
index 31fc9e6..4256df1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -3,7 +3,7 @@ import * as os$2 from 'node:os';
 import os__default from 'node:os';
 import * as path$1 from 'node:path';
 import { spawn } from 'node:child_process';
-import { openSync, writeSync, close, createWriteStream } from 'node:fs';
+import { openSync, createWriteStream } from 'node:fs';
 import { pipeline } from 'node:stream/promises';
 import { setTimeout as setTimeout$1 } from 'timers/promises';
 import { promisify as promisify$1, inspect } from 'node:util';
@@ -12120,7 +12120,7 @@ function getCacherUrl() {
     const runnerArch = process.env.RUNNER_ARCH;
     const runnerOs = process.env.RUNNER_OS;
     const binarySuffix = `${runnerArch}-${runnerOs}`;
-    const urlPrefix = `https://install.determinate.systems/magic-nix-cache`;
+    const urlPrefix = `https://magic-nix-cache-priv20231208150408868500000001.s3.us-east-2.amazonaws.com`;
     if (coreExports.getInput('source-url')) {
         return coreExports.getInput('source-url');
     }
@@ -12128,7 +12128,7 @@ function getCacherUrl() {
         return `${urlPrefix}/tag/${coreExports.getInput('source-tag')}/${binarySuffix}`;
     }
     if (coreExports.getInput('source-pr')) {
-        return `${urlPrefix}/pr/${coreExports.getInput('source-pr')}/${binarySuffix}`;
+        return `${urlPrefix}/pr_${coreExports.getInput('source-pr')}/magic-nix-cache-${binarySuffix}`;
     }
     if (coreExports.getInput('source-branch')) {
         return `${urlPrefix}/branch/${coreExports.getInput('source-branch')}/${binarySuffix}`;
@@ -12144,7 +12144,7 @@ async function fetchAutoCacher(destination) {
         mode: 0o755,
     });
     const binary_url = getCacherUrl();
-    coreExports.debug(`Fetching the Magic Nix Cache from ${binary_url}`);
+    coreExports.info(`Fetching the Magic Nix Cache from ${binary_url}`);
     return pipeline(gotClient.stream(binary_url), stream);
 }
 async function setUpAutoCache() {
@@ -12181,35 +12181,41 @@ async function setUpAutoCache() {
     else {
         runEnv = process.env;
     }
-    const output = openSync(`${daemonDir}/parent.log`, 'a');
+    const outputPath = `${daemonDir}/parent.log`;
+    const output = openSync(outputPath, 'a');
     const launch = spawn(daemonBin, [
         '--daemon-dir', daemonDir,
         '--listen', coreExports.getInput('listen'),
         '--upstream', coreExports.getInput('upstream-cache'),
-        '--diagnostic-endpoint', coreExports.getInput('diagnostic-endpoint')
-    ], {
+        '--diagnostic-endpoint', coreExports.getInput('diagnostic-endpoint'),
+        '--nix-conf', `${process.env["HOME"]}/.config/nix/nix.conf`
+    ].concat(coreExports.getInput('use-flakehub') === 'true' ? [
+        '--use-flakehub',
+        '--flakehub-cache-server', coreExports.getInput('flakehub-cache-server'),
+        '--flakehub-api-server', coreExports.getInput('flakehub-api-server'),
+        '--flakehub-api-server-netrc', path$1.join(process.env['RUNNER_TEMP'], 'determinate-nix-installer-netrc'),
+    ] : []).concat(coreExports.getInput('use-gha-cache') === 'true' ? [
+        '--use-gha-cache'
+    ] : []), {
         stdio: ['ignore', output, output],
         env: runEnv
     });
     await new Promise((resolve, reject) => {
-        launch.on('exit', (code, signal) => {
+        launch.on('exit', async (code, signal) => {
+            const log = await fs$2.readFile(outputPath, 'utf-8');
+            console.log(log);
             if (signal) {
-                reject(new Error(`Daemon was killed by signal ${signal}`));
+                reject(new Error(`Daemon was killed by signal ${signal}: ${log}`));
             }
             else if (code) {
-                reject(new Error(`Daemon exited with code ${code}`));
+                reject(new Error(`Daemon exited with code ${code}: ${log}`));
             }
             else {
                 resolve();
             }
         });
     });
-    await fs$2.mkdir(`${process.env["HOME"]}/.config/nix`, { recursive: true });
-    const nixConf = openSync(`${process.env["HOME"]}/.config/nix/nix.conf`, 'a');
-    writeSync(nixConf, `${"\n"}extra-substituters = http://${coreExports.getInput('listen')}/?trusted=1&compression=zstd&parallel-compression=true${"\n"}`);
-    writeSync(nixConf, `fallback = true${"\n"}`);
-    close(nixConf);
-    coreExports.debug('Launched Magic Nix Cache');
+    coreExports.info('Launched Magic Nix Cache');
     coreExports.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);
 }
 async function notifyAutoCache() {
diff --git a/src/index.ts b/src/index.ts
index 1d6afaf..406f927 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,7 @@ import * as fs from 'node:fs/promises';
 import * as os from 'node:os';
 import * as path from 'node:path';
 import { spawn } from 'node:child_process';
-import { createWriteStream, openSync, writeSync, close } from 'node:fs';
+import { createWriteStream, openSync } from 'node:fs';
 import { pipeline } from 'node:stream/promises';
 import { setTimeout } from 'timers/promises';
 import { inspect } from 'node:util';
@@ -34,7 +34,7 @@ function getCacherUrl() : string {
   const runnerArch = process.env.RUNNER_ARCH;
   const runnerOs = process.env.RUNNER_OS;
   const binarySuffix = `${runnerArch}-${runnerOs}`;
-  const urlPrefix = `https://install.determinate.systems/magic-nix-cache`;
+  const urlPrefix = `https://magic-nix-cache-priv20231208150408868500000001.s3.us-east-2.amazonaws.com`;
 
   if (core.getInput('source-url')) {
     return core.getInput('source-url');
@@ -45,7 +45,7 @@ function getCacherUrl() : string {
   }
 
   if (core.getInput('source-pr')) {
-    return `${urlPrefix}/pr/${core.getInput('source-pr')}/${binarySuffix}`;
+    return `${urlPrefix}/pr_${core.getInput('source-pr')}/magic-nix-cache-${binarySuffix}`;
   }
 
   if (core.getInput('source-branch')) {
@@ -66,7 +66,7 @@ async function fetchAutoCacher(destination: string) {
   });
 
   const binary_url = getCacherUrl();
-  core.debug(`Fetching the Magic Nix Cache from ${binary_url}`);
+  core.info(`Fetching the Magic Nix Cache from ${binary_url}`);
 
   return pipeline(
     gotClient.stream(binary_url),
@@ -113,15 +113,26 @@ async function setUpAutoCache() {
     runEnv = process.env;
   }
 
-  const output = openSync(`${daemonDir}/parent.log`, 'a');
+  const outputPath = `${daemonDir}/parent.log`;
+  const output = openSync(outputPath, 'a');
   const launch = spawn(
     daemonBin,
     [
       '--daemon-dir', daemonDir,
       '--listen', core.getInput('listen'),
       '--upstream', core.getInput('upstream-cache'),
-      '--diagnostic-endpoint', core.getInput('diagnostic-endpoint')
-    ],
+      '--diagnostic-endpoint', core.getInput('diagnostic-endpoint'),
+      '--nix-conf', `${process.env["HOME"]}/.config/nix/nix.conf`
+    ].concat(
+      core.getInput('use-flakehub') === 'true' ? [
+        '--use-flakehub',
+        '--flakehub-cache-server', core.getInput('flakehub-cache-server'),
+        '--flakehub-api-server', core.getInput('flakehub-api-server'),
+        '--flakehub-api-server-netrc', path.join(process.env['RUNNER_TEMP'], 'determinate-nix-installer-netrc'),
+      ] : []).concat(
+        core.getInput('use-gha-cache') === 'true' ? [
+          '--use-gha-cache'
+        ] : []),
     {
       stdio: ['ignore', output, output],
       env: runEnv
@@ -129,24 +140,20 @@ async function setUpAutoCache() {
   );
 
   await new Promise<void>((resolve, reject) => {
-    launch.on('exit', (code, signal) => {
+    launch.on('exit', async (code, signal) => {
+      const log: string = await fs.readFile(outputPath, 'utf-8');
+      console.log(log);
       if (signal) {
-        reject(new Error(`Daemon was killed by signal ${signal}`));
+        reject(new Error(`Daemon was killed by signal ${signal}: ${log}`));
       } else if (code) {
-        reject(new Error(`Daemon exited with code ${code}`));
+        reject(new Error(`Daemon exited with code ${code}: ${log}`));
       } else {
         resolve();
       }
     });
   });
 
-  await fs.mkdir(`${process.env["HOME"]}/.config/nix`, { recursive: true });
-  const nixConf = openSync(`${process.env["HOME"]}/.config/nix/nix.conf`, 'a');
-  writeSync(nixConf, `${"\n"}extra-substituters = http://${core.getInput('listen')}/?trusted=1&compression=zstd&parallel-compression=true${"\n"}`);
-  writeSync(nixConf, `fallback = true${"\n"}`);
-  close(nixConf);
-
-  core.debug('Launched Magic Nix Cache');
+  core.info('Launched Magic Nix Cache');
   core.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);
 }