From 01f3685d9b7a241c272320b4839c2b6105ca5396 Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Thu, 6 May 2021 00:50:24 +0200
Subject: [PATCH] nixos-module/server/lxc-containers: add shortenNetName

---
 nix/nixos-module/server/lxc-containers.nix | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/nix/nixos-module/server/lxc-containers.nix b/nix/nixos-module/server/lxc-containers.nix
index 145981f..cc2cbff 100644
--- a/nix/nixos-module/server/lxc-containers.nix
+++ b/nix/nixos-module/server/lxc-containers.nix
@@ -11,6 +11,12 @@ let
 
   enabled = containers != {};
 
+  # linux iface name max length = 15
+  shortenNetName = name:
+    if builtins.match "priv(.*)" name != null
+    then "pr" + builtins.substring 4 9 name
+    else name;
+
   # `lxc.net.*` formatter for lxc.container.conf files
   netConfig = ctName: interfaces:
     let
@@ -25,7 +31,7 @@ let
                    then ifData.hwaddr
                    else "0A:14:48:xx:xx:xx";
         } // (lib.optionalAttrs (ifData.type == "veth") {
-          veth.pair = "${ctName}-${netName}";
+          veth.pair = "${ctName}-${shortenNetName netName}";
           veth.mode = "bridge";
           link = "${netName}";
         }) // (lib.optionalAttrs (ifData.type == "phys") {