fix[work]: fix aws,cdr commands, easier git switch in emacs

pkgs/flake/swarsel-deploy/default.nix

@@ -0,0 +1,123 @@
+# heavily inspired from https://github.com/oddlama/nix-config/blob/d42cbde676001a7ad8a3cace156e050933a4dcc3/pkgs/deploy.nix
+{ name, bc, nix-output-monitor, writeShellApplication, ... }:
+writeShellApplication {
+  runtimeInputs = [ bc nix-output-monitor ];
+  inherit name;
+  text = ''
+    set -euo pipefail
+    shopt -s lastpipe # allow cmd | readarray
+
+    function die() {
+        echo "error: $*" >&2
+        exit 1
+    }
+    function show_help() {
+        echo 'Usage: deploy [OPTIONS] <host,...> [ACTION]'
+        echo "Builds, pushes and activates nixosConfigurations on target systems."
+        echo ""
+        echo 'ACTION:'
+        echo '  switch          [default] Switch immediately to the new configuration and make it the boot default'
+        echo '  boot            Make the configuration the new boot default'
+        echo "  test            Activate the configuration but don't make it the boot default"
+        echo "  dry-activate    Don't activate, just show what would be done"
+        echo ""
+        echo 'OPTIONS: [passed to nix build]'
+    }
+
+    function time_start() {
+        T_START=$(date +%s.%N)
+    }
+
+    function time_next() {
+        T_END=$(date +%s.%N)
+        T_LAST=$(${bc}/bin/bc <<< "scale=1; ($T_END - $T_START)/1")
+        T_START="$T_END"
+    }
+
+    USER_FLAKE_DIR=$(git rev-parse --show-toplevel 2> /dev/null || pwd) ||
+        die "Could not determine current working directory. Something went very wrong."
+    [[ -e "$USER_FLAKE_DIR/flake.nix" ]] ||
+        die "Could not determine location of your project's flake.nix. Please run this at or below your main directory containing the flake.nix."
+    cd "$USER_FLAKE_DIR"
+
+    [[ $# -gt 0 ]] || {
+        show_help
+        exit 1
+    }
+
+    OPTIONS=()
+    POSITIONAL_ARGS=()
+    while [[ $# -gt 0 ]]; do
+        case "$1" in
+        "help" | "--help" | "-help" | "-h")
+            show_help
+            exit 1
+            ;;
+
+        -*) OPTIONS+=("$1") ;;
+        *) POSITIONAL_ARGS+=("$1") ;;
+        esac
+        shift
+    done
+
+    [[ ''${#POSITIONAL_ARGS[@]} -ge 1 ]] ||
+        die "Missing argument: <hosts...>"
+    [[ ''${#POSITIONAL_ARGS[@]} -le 2 ]] ||
+        die "Too many arguments given."
+
+    tr , '\n' <<< "''${POSITIONAL_ARGS[0]}" | sort -u | readarray -t HOSTS
+    ACTION="''${POSITIONAL_ARGS[1]-switch}"
+
+    # Expand flake paths for hosts definitions
+    declare -A TOPLEVEL_FLAKE_PATHS
+    for host in "''${HOSTS[@]}"; do
+        TOPLEVEL_FLAKE_PATHS["$host"]=".#nixosConfigurations.$host.config.system.build.toplevel"
+    done
+
+    time_start
+
+    # Get outputs of all derivations (should be cached)
+    declare -A TOPLEVEL_STORE_PATHS
+    for host in "''${HOSTS[@]}"; do
+        toplevel="''${TOPLEVEL_FLAKE_PATHS["$host"]}"
+        # Make sudo call to get prompt out of the way
+        sudo echo "    Building 📦 $host"
+        nix build --no-link "''${OPTIONS[@]}" --show-trace --log-format internal-json -v "$toplevel" |& ${nix-output-monitor}/bin/nom --json ||
+            die "Failed to get derivation path for $host from ''${TOPLEVEL_FLAKE_PATHS["$host"]}"
+        TOPLEVEL_STORE_PATHS["$host"]=$(nix build --no-link --print-out-paths "''${OPTIONS[@]}" "$toplevel")
+        time_next
+        echo "       Built ✅ $host ''${TOPLEVEL_STORE_PATHS["$host"]} in ''${T_LAST}s"
+    done
+
+    current_host=$(hostname)
+
+    for host in "''${HOSTS[@]}"; do
+        store_path="''${TOPLEVEL_STORE_PATHS["$host"]}"
+
+        if [ "$host" = "$current_host" ]; then
+            echo -e "\033[1;36m    Running locally for $host... \033[m"
+            ssh_prefix="sudo"
+        else
+            echo -e "\033[1;36m     Copying \033[m➡️  \033[34m$host\033[m"
+            nix copy --to "ssh://$host" "$store_path"
+            time_next
+            echo -e "\033[1;32m      Copied \033[m✅  \033[34m$host\033[m \033[90min ''${T_LAST}s\033[m"
+            ssh_prefix="ssh $host --"
+        fi
+
+        echo -e "\033[1;36m    Applying \033[m⚙️  \033[34m$host\033[m"
+        prev_system=$($ssh_prefix readlink -e /nix/var/nix/profiles/system)
+        $ssh_prefix /run/current-system/sw/bin/nix-env --profile /nix/var/nix/profiles/system --set "$store_path" ||
+            die "Failed to set system profile"
+        $ssh_prefix "$store_path"/bin/switch-to-configuration "$ACTION" ||
+            echo "Error while activating new system" >&2
+
+        if [[ -n $prev_system ]]; then
+            $ssh_prefix nvd --color always diff "$prev_system" "$store_path" || true
+        fi
+
+        time_next
+        echo -e "\033[1;32m     Applied \033[m✅  \033[34m$host\033[m \033[90min ''${T_LAST}s\033[m"
+    done
+  '';
+}