From 78d46de2564ada5729e2d2eaf4a07b386a7c93c2 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Thu, 24 Oct 2024 15:11:08 +0200
Subject: [PATCH] build.py: Require --etc-portage on non-Gentoo hosts

---
 binary_gentoo/internal/cli/build.py            | 7 ++++++-
 binary_gentoo/internal/cli/tests/test_build.py | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/binary_gentoo/internal/cli/build.py b/binary_gentoo/internal/cli/build.py
index 4c8b598..e21f162 100644
--- a/binary_gentoo/internal/cli/build.py
+++ b/binary_gentoo/internal/cli/build.py
@@ -164,8 +164,13 @@ def parse_command_line(argv):
         "--etc-portage",
         dest="host_etc_portage",
         metavar="DIR",
+        required=not HOST_IS_GENTOO,
         default="/etc/portage",
-        help='enforce specific location for /etc/portage (default: "%(default)s")',
+        help=(
+            'enforce specific location for /etc/portage (default: "%(default)s")'
+            if HOST_IS_GENTOO
+            else "specify /etc/portage location (required)"
+        ),
     )
 
     parser_group_flavors_or_image = parser.add_mutually_exclusive_group()
diff --git a/binary_gentoo/internal/cli/tests/test_build.py b/binary_gentoo/internal/cli/tests/test_build.py
index 9c1bfea..01893c9 100644
--- a/binary_gentoo/internal/cli/tests/test_build.py
+++ b/binary_gentoo/internal/cli/tests/test_build.py
@@ -107,6 +107,7 @@ def _run_gentoo_build_with_subprocess_mocked(
             TemporaryDirectory() as temp_pkgdir,
             TemporaryDirectory() as temp_portdir,
             TemporaryDirectory() as temp_logdir,
+            TemporaryDirectory() as temp_etcportagedir,
         ):
             argv = (
                 [
@@ -119,6 +120,8 @@ def _run_gentoo_build_with_subprocess_mocked(
                     temp_portdir,
                     "--logdir",
                     temp_logdir,
+                    "--etc-portage",
+                    temp_etcportagedir,
                     "--gentoo-profile",
                     "default/linux/profile123",
                     "--cflags",