From 67fbc7aa24cf0f4b5322b6f99fb3856bb9a1ab08 Mon Sep 17 00:00:00 2001
From: Ameya Shenoy <shenoy.ameya@gmail.com>
Date: Fri, 31 May 2024 15:52:23 +0530
Subject: [PATCH] checks: add check to ensure Homebrew is installed

Co-Authored-By: Michael Hoang <enzime@users.noreply.github.com>
---
 modules/system/checks.nix | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/modules/system/checks.nix b/modules/system/checks.nix
index ec6e3b5..ab6ea19 100644
--- a/modules/system/checks.nix
+++ b/modules/system/checks.nix
@@ -28,6 +28,7 @@ let
     fi
   '';
 
+
   oldBuildUsers = ''
     if dscl . -list /Users | grep -q '^nixbld'; then
         echo "error: Detected old style nixbld users, aborting activation" >&2
@@ -283,6 +284,19 @@ let
         exit 2
     fi
   '';
+
+  homebrewInstalled = ''
+    if [[ ! -f ${escapeShellArg config.homebrew.brewPrefix}/brew ]]; then
+        echo "error: Using the homebrew module requires homebrew installed, aborting activation" >&2
+        echo "Homebrew doesn't seem to be installed. Please install homebrew separately." >&2
+        echo "You can install homebrew using the following command:" >&2
+        echo >&2
+        # shellcheck disable=SC2016
+        echo '    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"' >&2
+        echo >&2
+        exit 2
+    fi
+  '';
 in
 
 {
@@ -331,6 +345,7 @@ in
       nixInstaller
       (mkIf cfg.verifyNixPath nixPath)
       oldSshAuthorizedKeysDirectory
+      (mkIf config.homebrew.enable homebrewInstalled)
     ];
 
     system.activationScripts.checks.text = ''