From 50672e10e87fa90f9ded5065aa4bc4ce0afaf730 Mon Sep 17 00:00:00 2001
From: Benedikt Peetz <benedikt.peetz@b-peetz.de>
Date: Wed, 25 Dec 2024 01:34:17 +0100
Subject: [WIP] Setup `deploy-rs` and add networking detection script

---
 scripts/deploy.sh            |  3 +-
 scripts/mk_network_config.sh | 86 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100755 scripts/mk_network_config.sh

(limited to 'scripts')

diff --git a/scripts/deploy.sh b/scripts/deploy.sh
index 9d27e5a..00e9011 100755
--- a/scripts/deploy.sh
+++ b/scripts/deploy.sh
@@ -11,6 +11,7 @@ root="$(git rev-parse --show-toplevel)"
 nix run github:numtide/nixos-anywhere -- \
     --flake ".#$host_name" \
     --target-host "$ssh_url" \
-    --generate-hardware-config nixos-facter "$root/hardware_config_$host_name.nix"
+    --generate-hardware-config nixos-generate-config "$root/hardware_config_$host_name.nix" \
+    --generate-hardware-config nixos-facter "$root/hardware_config_$host_name.json"
 
 # vim: ft=sh
diff --git a/scripts/mk_network_config.sh b/scripts/mk_network_config.sh
new file mode 100755
index 0000000..d929530
--- /dev/null
+++ b/scripts/mk_network_config.sh
@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+
+# Taken from: https://github.com/elitak/nixos-infect
+set -e -o pipefail
+
+makeNetworkingConf() {
+    # XXX It'd be better if we used procfs for all this...
+    local IFS=$'\n'
+    eth0_name=$(ip address show | grep '^2:' | awk -F': ' '{print $2}')
+    eth0_ip4s=$(ip address show dev "$eth0_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
+    eth0_ip6s=$(ip address show dev "$eth0_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || true)
+    gateway=$(ip route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9.]+).*|\1|')
+    gateway6=$(ip -6 route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9a-f:]+).*|\1|' || true)
+    ether0=$(ip address show dev "$eth0_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
+
+    eth1_name=$(ip address show | grep '^3:' | awk -F': ' '{print $2}') || true
+    if [ -n "$eth1_name" ]; then
+        eth1_ip4s=$(ip address show dev "$eth1_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
+        eth1_ip6s=$(ip address show dev "$eth1_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || true)
+        ether1=$(ip address show dev "$eth1_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
+        interfaces1=$(
+            cat <<EOF
+      $eth1_name = {
+        ipv4.addresses = [$(for a in "${eth1_ip4s[@]}"; do echo -n "
+          $a"; done)
+        ];
+        ipv6.addresses = [$(for a in "${eth1_ip6s[@]}"; do echo -n "
+          $a"; done)
+        ];
+        };
+EOF
+        )
+        extraRules1="ATTR{address}==\"${ether1}\", NAME=\"${eth1_name}\""
+    else
+        interfaces1=""
+        extraRules1=""
+    fi
+
+    readarray nameservers < <(grep ^nameserver /etc/resolv.conf | sed -r \
+        -e 's/^nameserver[[:space:]]+([0-9.a-fA-F:]+).*/"\1"/' \
+        -e 's/127[0-9.]+/8.8.8.8/' \
+        -e 's/::1/8.8.8.8/')
+
+    if [[ "$eth0_name" = eth* ]]; then
+        predictable_inames="usePredictableInterfaceNames = lib.mkForce false;"
+    else
+        predictable_inames="usePredictableInterfaceNames = lib.mkForce true;"
+    fi
+    cat <<EOF
+{ lib, ... }: {
+  # This file was populated at runtime with the networking
+  # details gathered from the active system.
+  networking = {
+    nameservers = [ ${nameservers[@]} ];
+    defaultGateway = "${gateway}";
+    defaultGateway6 = {
+      address = "${gateway6}";
+      interface = "${eth0_name}";
+    };
+    dhcpcd.enable = false;
+    $predictable_inames
+    interfaces = {
+      $eth0_name = {
+        ipv4.addresses = [$(for a in "${eth0_ip4s[@]}"; do echo -n "
+          $a"; done)
+        ];
+        ipv6.addresses = [$(for a in "${eth0_ip6s[@]}"; do echo -n "
+          $a"; done)
+        ];
+        ipv4.routes = [ { address = "${gateway}"; prefixLength = 32; } ];
+        ipv6.routes = [ { address = "${gateway6}"; prefixLength = 128; } ];
+      };
+      $interfaces1
+    };
+  };
+  services.udev.extraRules = ''
+    ATTR{address}=="${ether0}", NAME="${eth0_name}"
+    $extraRules1
+  '';
+}
+EOF
+}
+
+makeNetworkingConf
+
+# vim: ft=sh
-- 
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