From cc7d3a6b454fad2b11438a1beb1052a8b0109d92 Mon Sep 17 00:00:00 2001
From: bin456789 <bin456789@gmail.com>
Date: Thu, 22 Aug 2024 00:03:38 +0800
Subject: [PATCH] =?UTF-8?q?nixos:=20=E4=B8=8D=E4=BD=BF=E7=94=A8=20grub-mkc?=
 =?UTF-8?q?onfig?=
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grub-mkconfig -o /boot/grub/grub.cfg 会丢失系统启动条目
---
 reinstall.sh | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/reinstall.sh b/reinstall.sh
index 9ec1386..0647f8a 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -3224,7 +3224,21 @@ if is_use_grub; then
         else
             error_and_exit "grub not found"
         fi
-        $grub-mkconfig -o $grub_cfg
+
+        # nixos 手动执行 grub-mkconfig -o /boot/grub/grub.cfg 会丢失系统启动条目
+        # 正确的方法是修改 configuration.nix 的 boot.loader.grub.extraEntries
+        # 但是修改 configuration.nix 不是很好，因此改成修改 grub.cfg
+        if [ -x /nix/var/nix/profiles/system/bin/switch-to-configuration ]; then
+            # 生成 grub.cfg
+            /nix/var/nix/profiles/system/bin/switch-to-configuration boot
+            # 手动启用 41_custom
+            nixos_grub_home="$(dirname "$(readlink -f "$(get_cmd_path grub-mkconfig)")")/.."
+            $nixos_grub_home/etc/grub.d/41_custom >>$grub_cfg
+        elif is_have_cmd update-grub; then
+            update-grub
+        else
+            $grub-mkconfig -o $grub_cfg
+        fi
     fi
 
     # 选择用 custom.cfg (linux-bios) 还是 grub.cfg (win/linux-efi)