From 5f97342120aff51bc043f27562393f71f87b4b9b Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Thu, 16 Jan 2020 11:30:34 +0100
Subject: [dnbd3-rootfs] fallback for missing slxsrv in kcl

---
 builder/modules.d/dnbd3-rootfs/hooks/fetch-config.sh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/builder/modules.d/dnbd3-rootfs/hooks/fetch-config.sh b/builder/modules.d/dnbd3-rootfs/hooks/fetch-config.sh
index a1f8995c..2b63f917 100755
--- a/builder/modules.d/dnbd3-rootfs/hooks/fetch-config.sh
+++ b/builder/modules.d/dnbd3-rootfs/hooks/fetch-config.sh
@@ -17,6 +17,20 @@ slx_server="$(getarg slxsrv=)"
 slx_server_base="$(getarg slxbase=)"
 exceptions.activate
 
+# if no slxsrv was specified, use the server the kernel was
+# downloaded from as fallback. Mostly for legacy PXE boot.
+if [ -z "$slx_server" ]; then
+    slx_server="$(getarg BOOT_IMAGE= | awk -F[/:] '{print $4}')"
+fi
+if [ -z "$slx_server" ]; then
+    # use tftp server from ip parameter
+    slx_server="$(getarg ip= | awk -F: '{print $2}' )"
+fi
+if [ -z "$slx_server" ]; then
+    # we have a problem :/
+    emergency_shell "Failed to determine SLX server to fetch config from."
+fi
+
 # build config_url
 config_url="http://${slx_server#@}/${slx_server_base}/config"
 
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