From 86ad25625f7fb6867e515cb09d1da40834f75a9a Mon Sep 17 00:00:00 2001
From: Nikolay Amiantov <ab@fmap.me>
Date: Thu, 7 Jul 2016 00:44:02 +0300
Subject: [PATCH] nixos stage-1: add custom pre failure dialog commands

---
 nixos/modules/system/boot/stage-1-init.sh |  2 ++
 nixos/modules/system/boot/stage-1.nix     | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/system/boot/stage-1-init.sh b/nixos/modules/system/boot/stage-1-init.sh
index d4277ebd80c..7705dcb2d12 100644
--- a/nixos/modules/system/boot/stage-1-init.sh
+++ b/nixos/modules/system/boot/stage-1-init.sh
@@ -14,6 +14,8 @@ export LVM_SUPPRESS_FD_WARNINGS=true
 fail() {
     if [ -n "$panicOnFail" ]; then exit 1; fi
 
+    @preFailCommands@
+
     # If starting stage 2 failed, allow the user to repair the problem
     # in an interactive shell.
     cat <<EOF
diff --git a/nixos/modules/system/boot/stage-1.nix b/nixos/modules/system/boot/stage-1.nix
index 56a9c38b8f2..4b1d3efb411 100644
--- a/nixos/modules/system/boot/stage-1.nix
+++ b/nixos/modules/system/boot/stage-1.nix
@@ -208,7 +208,7 @@ let
     inherit (config.boot) resumeDevice devSize runSize;
 
     inherit (config.boot.initrd) checkJournalingFS
-      preLVMCommands preDeviceCommands postDeviceCommands postMountCommands kernelModules;
+      preLVMCommands preDeviceCommands postDeviceCommands postMountCommands preFailCommands kernelModules;
 
     resumeDevices = map (sd: if sd ? device then sd.device else "/dev/disk/by-label/${sd.label}")
                     (filter (sd: (sd ? label || hasPrefix "/dev/" sd.device) && !sd.randomEncryption) config.swapDevices);
@@ -336,6 +336,14 @@ in
       '';
     };
 
+    boot.initrd.preFailCommands = mkOption {
+      default = "";
+      type = types.lines;
+      description = ''
+        Shell commands to be executed before the failure prompt is shown.
+      '';
+    };
+
     boot.initrd.extraUtilsCommands = mkOption {
       internal = true;
       default = "";