add support for default configuration in flake.nix

CHANGELOG.md

@@ -21,6 +21,9 @@
   and `config` and `extraModules` are now combined into `modules`
 * Add option `environment.motd` to edit the startup message that is printed in
   every shell
+* For flake setups, the output `nixOnDroidConfigurations.default` will be used
+  when `nix-on-droid switch --flake path/to/flake` is called without attribute
+  name
 
 ## Release 22.05
 

README.md

@@ -192,7 +192,7 @@ A minimal example could look like the following:
 
   outputs = { self, nixpkgs, nix-on-droid }: {
 
-    nixOnDroidConfigurations.deviceName = nix-on-droid.lib.nixOnDroidConfiguration {
+    nixOnDroidConfigurations.default = nix-on-droid.lib.nixOnDroidConfiguration {
       modules = [ ./nix-on-droid.nix ];
     };
 
@@ -208,8 +208,9 @@ nix flake init --template github:t184256/nix-on-droid#advanced
 
 ### Usage with `nix-on-droid`
 
-Use `nix-on-droid switch --flake .#device` to build and activate your configuration (`.#device` will expand to
-`.#nixOnDroidConfigurations.device`).
+Use `nix-on-droid switch --flake path/to/flake#device` to build and activate your configuration (`path/to/flake#device`
+will expand to `.#nixOnDroidConfigurations.device`). If you run `nix-on-droid switch --flake path/to/flake`, the
+`default` configuration will be used.
 
 **Note:** Currently, nix-on-droid can not be built with an pure flake build because of hardcoded store paths for proot.
 Therefore, every evaluation of a flake configuration will be executed with `--impure` flag. (This behaviour will be

modules/environment/login/login-inner.nix

@@ -89,7 +89,7 @@ writeText "login-inner" ''
         ''}
 
         echo "Installing first nix-on-droid generation..."
-        ${nixCmd} run ${config.build.flake.nix-on-droid} -- switch --flake ${config.user.home}/.config/nix-on-droid#deviceName
+        ${nixCmd} run ${config.build.flake.nix-on-droid} -- switch --flake ${config.user.home}/.config/nix-on-droid
 
         . "${config.user.home}/.nix-profile/etc/profile.d/nix-on-droid-session-init.sh"
 

nix-on-droid/nix-on-droid.sh

@@ -58,7 +58,8 @@ function doHelp() {
     echo "  -n|--dry-run      Do a dry run, only prints what actions would be taken"
     echo "  -v|--verbose      Verbose output"
     echo "  -f|--file FILE    Path to config file"
-    echo "  -F|--flake FLAKE  Path to flake and device name (e.g. path/to/flake#device)"
+    echo "  -F|--flake FLAKE  Path to flake and device name (e.g. path/to/flake#device),"
+    echo "                    device 'default' will be used if no attribute name is given"
     echo
     echo "Options passed on to nix build"
     echo
@@ -139,7 +140,12 @@ while [[ $# -gt 0 ]]; do
             PASSTHROUGH_OPTS+=(--extra-experimental-features "flakes nix-command")
             # add "nixOnDroidConfigurations." as prefix in attribute name, e.g.
             # /path/to/flake#device -> /path/to/flake#nixOnDroidConfigurations.device
-            FLAKE_CONFIG_URI="${1%#*}#nixOnDroidConfigurations.${1#*#}"
+            # if no attribute name given, use "default"
+            if [[ "$1" =~ \# ]]; then
+                FLAKE_CONFIG_URI="${1%#*}#nixOnDroidConfigurations.${1#*#}"
+            else
+                FLAKE_CONFIG_URI="${1}#nixOnDroidConfigurations.default"
+            fi
             shift
             ;;
         -h|--help)

templates/advanced/flake.nix

@@ -18,7 +18,7 @@
 
   outputs = { self, nixpkgs, home-manager, nix-on-droid }: {
 
-    nixOnDroidConfigurations.deviceName = nix-on-droid.lib.nixOnDroidConfiguration {
+    nixOnDroidConfigurations.default = nix-on-droid.lib.nixOnDroidConfiguration {
       modules = [
         ./nix-on-droid.nix
 

templates/home-manager/flake.nix

@@ -18,7 +18,7 @@
 
   outputs = { self, nixpkgs, home-manager, nix-on-droid }: {
 
-    nixOnDroidConfigurations.deviceName = nix-on-droid.lib.nixOnDroidConfiguration {
+    nixOnDroidConfigurations.default = nix-on-droid.lib.nixOnDroidConfiguration {
       modules = [ ./nix-on-droid.nix ];
     };
 

templates/minimal/flake.nix

@@ -12,7 +12,7 @@
 
   outputs = { self, nixpkgs, nix-on-droid }: {
 
-    nixOnDroidConfigurations.deviceName = nix-on-droid.lib.nixOnDroidConfiguration {
+    nixOnDroidConfigurations.default = nix-on-droid.lib.nixOnDroidConfiguration {
       modules = [ ./nix-on-droid.nix ];
     };
 

tests/on-device/config-flake-default.nix

@@ -0,0 +1,17 @@
+{
+  description = "nix-on-droid configuration";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/release-22.05";
+    nix-on-droid.url = "<<FLAKE_URL>>";
+    nix-on-droid.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { nix-on-droid, ... }: {
+    nixOnDroidConfigurations = {
+      default = nix-on-droid.lib.nixOnDroidConfiguration {
+        modules = [ ./nix-on-droid.nix ];
+      };
+    };
+  };
+}

tests/on-device/config-flake.bats

@@ -1,8 +1,11 @@
-# Copyright (c) 2019-2021, see AUTHORS. Licensed under MIT License, see LICENSE.
+# Copyright (c) 2019-2022, see AUTHORS. Licensed under MIT License, see LICENSE.
 
 load lib
 
-@test 'flake example works' {
+function flake_example() {
+  local flake_url="$1"
+  local flake_file_name="$2"
+
   # assertions to verify initial state is as expected
   assert_command vi
   assert_no_command unzip
@@ -15,10 +18,10 @@ load lib
     > ~/.config/nixpkgs/nix-on-droid.nix
 
   _sed "s|<<FLAKE_URL>>|$FLAKE_URL|g" \
-    "$ON_DEVICE_TESTS_DIR/config-flake.nix" \
+    "$ON_DEVICE_TESTS_DIR/$flake_file_name" \
     > ~/.config/nixpkgs/flake.nix
 
-  nix-on-droid switch --flake ~/.config/nixpkgs#device
+  nix-on-droid switch --flake "$flake_url"
 
   # test presence of several crucial commands
   assert_command nix-on-droid nix-shell bash
@@ -32,3 +35,11 @@ load lib
   assert_command vi
   assert_no_command unzip
 }
+
+@test 'flake example works' {
+  flake_example ~/.config/nixpkgs#device config-flake.nix
+}
+
+@test 'flake with default config works' {
+  flake_example ~/.config/nixpkgs config-flake-default.nix
+}