README: add deploy-flake.sh for non-nixos users

README.md

@@ -46,7 +46,17 @@ for example: `nix run c3d2#glotzbert-nixos-rebuild switch`. Use `nix flake show
 to show what is available. Note that the deploy scripts only work if
 the target machines already has flakes enabled.
 
+### Remote deployment from non-NixOS
 
+A shell script that copies the current working tree, and runs
+`nixos-rebuild switch` on the target:
+
+```shell
+./deploy-flake.sh hydra.hq.c3d2.de
+```
+
+It cannot not lookup hostnames in `host-registry.nix`.
+It will not take extra care of the *secrets*.
 
 ## Mit NixOps
 

deploy-flake.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+
+TARGET=$1
+if [ -z "$TARGET" ]; then
+    echo "Usage: $0 <host.hq.c3d2.de>"
+    exit 1
+fi
+HOSTNAME=$(echo $TARGET|cut -d . -f 1)
+
+rsync -az $(dirname $0) root@$TARGET:nix-config
+
+echo "$HOSTNAME> nixos-rebuild switch"
+exec ssh root@$TARGET "nixos-rebuild --flake ./nix-config#$HOSTNAME switch"