From c580fe0fbbe9af298b4d6d4a925b70ad574c6ae5 Mon Sep 17 00:00:00 2001
From: teutat3s <teutates@mailbox.org>
Date: Tue, 23 Apr 2024 16:32:11 +0200
Subject: [PATCH] ci: prevent flake inputs from GC as well

---
 .forgejo/workflows/check.yml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/.forgejo/workflows/check.yml b/.forgejo/workflows/check.yml
index f18c8bd..0968832 100644
--- a/.forgejo/workflows/check.yml
+++ b/.forgejo/workflows/check.yml
@@ -58,4 +58,14 @@ jobs:
             nix --print-build-logs --verbose --accept-flake-config --access-tokens '' \
               build --out-link ./result-$target ".#nixosConfigurations.${target}.config.system.build.toplevel"
           done
+
           nix --print-build-logs --verbose --accept-flake-config --access-tokens '' flake check
+
+          # Add GC roots for flake inputs, too
+          # https://github.com/NixOS/nix/issues/4250#issuecomment-1146878407
+          mkdir --parents "$NIX_USER_PROFILE_DIR"
+          gc_root_prefix="$NIX_USER_PROFILE_DIR"/infra-flake-
+          echo "Adding gcroots flake inputs with prefix $gc_root_prefix ..."
+          nix flake archive --json 2>/dev/null | jq --raw-output '.inputs | to_entries[] | "ln --force --symbolic --no-target-directory "+.value.path+" \"'"$gc_root_prefix"'"+.key+"\""' | while read -r line; do
+            eval "$line"
+          done