From 9edda48c7263f2f02d289267be2ae750a6909214 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 6 Oct 2019 18:06:15 -0400
Subject: for nested kvm, increment the MAC address

---
 src/qemu.sh | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/qemu.sh')

diff --git a/src/qemu.sh b/src/qemu.sh
index 2ae982d..130b688 100755
--- a/src/qemu.sh
+++ b/src/qemu.sh
@@ -30,7 +30,20 @@ kcmdline_CDROM='boot=samizdat components quiet splash'
 kcmdline_CDROM_NET="${kcmdline_CDROM} nbdroot=,${nbd_filename}, nbddev=/dev/nbd0 ip=dhcp"
 kcmdline_NET="${kcmdline_CDROM_NET} netkeys"
 
-MAC='52-54-00-12-34-56'
+find_mac()
+{
+  start_mac=$1
+  for mac in $(ip link show | grep link/ether | (read _ mac _; echo $mac | tr : -)); do
+    if [ "${mac%??}" = "${start_mac%??}" ]; then
+      prefix=${mac%??}
+      suffix=$(printf %x $(( 0x${mac##*-} + 1 )))
+      MAC=${prefix}${suffix}
+      return
+    fi
+  done
+  MAC=$start_mac
+}
+find_mac 52-54-00-12-34-56
 
 kcmdline_BOOTIF="BOOTIF=01-$MAC"
 
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