use local eval and copy-closure to the target

nixos-remote

@@ -65,6 +65,38 @@ timeout_ssh_() {
 ssh_() {
   ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no "$ssh_connection" "$@"
 }
+nixCopy() {
+  NIX_SSHOPTS='-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no' nix copy --extra-experimental-features nix-command "$@"
+}
+nix_build() {
+  nix \
+    --experimental-features flakes build \
+    --extra-experimental-features nix-command \
+    --no-write-lock-file \
+    --print-out-paths \
+    "$@"
+}
+
+nixos_system=""
+# parse flake nixos-install style syntax, get the system attr
+if [[ ! -z "${flake+x}" ]]; then
+  if [[ $flake =~ ^(.*)\#([^\#\"]*)$ ]]; then
+   flake="${BASH_REMATCH[1]}"
+   flakeAttr="${BASH_REMATCH[2]}"
+  fi
+  if [[ -z "$flakeAttr" ]]; then
+    echo "Please specify the name of the NixOS configuration to be installed, as a URI fragment in the flake-uri."
+    echo "For example, to use the output nixosConfigurations.foo from the flake.nix, append \"#foo\" to the flake-uri."
+    exit 1
+  fi
+  disko_script=$(nix_build "${flake}#nixosConfigurations.${flakeAttr}.config.system.build.disko")
+  nixos_system=$(nix_build "${flake}#nixosConfigurations.${flakeAttr}.config.system.build.toplevel")
+else
+  abort "flake must be set"
+fi
+
+# wait for machine to become reachable (possibly forever)
+until ssh_ -o ConnectTimeout=10 -- exit 0; do sleep 5; done
 
 # first check if the remote system is kexec booted
 if $(ssh_ -- test -e /etc/is_kexec); then
@@ -109,20 +141,12 @@ SSH
   until ssh_ -o ConnectTimeout=10 -- exit 0; do sleep 5; done
 fi
 
+nixCopy --to "ssh://$ssh_connection" "$disko_script"
+ssh_ $disko_script
 
+nixCopy --to "ssh://$ssh_connection?remote-store=local?root=/mnt" "$nixos_system"
 ssh_ << SSH
-set -efux
-$(declare -p nix_args)
-nix --extra-experimental-features nix-command --extra-experimental-features flakes \
-  run github:nix-community/disko \
-  --no-write-lock-file -- \
-    --debug -m create "\${nix_args[@]}" --flake "$flake"
-
-nix --extra-experimental-features nix-command --extra-experimental-features flakes \
-  run github:nix-community/disko \
-  --no-write-lock-file -- \
-    --debug -m mount "\${nix_args[@]}" --flake "$flake"
-
-nixos-install --flake "$flake"
+set -efu
+nixos-install --no-root-passwd --no-channel-copy --system "$nixos_system"
 reboot
 SSH