From 2a107a1b7b19d1f349b176d1b3d4f60bb7212901 Mon Sep 17 00:00:00 2001
From: Chloe Kever <chloe.kever@platonic.systems>
Date: Tue, 15 Feb 2022 18:42:53 -0800
Subject: [PATCH] Add dry runs.

Co-authored-by: Mason Mackaman <masondeanm@aol.com>
---
 flake.nix | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/flake.nix b/flake.nix
index 9165584..a5f19d1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,7 +17,7 @@
           let
             machines = builtins.attrNames flake.nixosConfigurations;
             validMachines = final.lib.remove "" (final.lib.forEach machines (x: final.lib.optionalString (flake.nixosConfigurations."${x}"._module.args ? nixinate) "${x}" ));
-            mkDeployScript = machine: let
+            mkDeployScript = { machine, dryRun }: let
               inherit (builtins) abort;
 
               n = flake.nixosConfigurations.${machine}._module.args.nixinate;
@@ -25,6 +25,7 @@
               host = n.host;
               where = n.buildOn or "remote";
               remote = if where == "remote" then true else if where == "local" then false else abort "_module.args.nixinate.buildOn is not set to a valid value of 'local' or 'remote'";
+              switch = if dryRun then "dry-activate" else "switch";
               script = ''
                 set -e
                 echo "🚀 Deploying nixosConfigurations.${machine} from ${flake}"
@@ -34,10 +35,10 @@
                 echo "🚀 Sending flake to ${machine} via rsync:"
                 ( set -x; ${final.rsync}/bin/rsync -q -vz --recursive --zc=zstd ${flake}/* ${user}@${host}:/tmp/nixcfg/ )
                 echo "🤞 Activating configuration on ${machine} via ssh:"
-                ( set -x; ${final.openssh}/bin/ssh -t ${user}@${host} 'sudo nixos-rebuild switch --flake /tmp/nixcfg#${machine}' )
+                ( set -x; ${final.openssh}/bin/ssh -t ${user}@${host} 'sudo nixos-rebuild ${switch} --flake /tmp/nixcfg#${machine}' )
               '' else ''
                 echo "🔨 Building system closure locally, copying it to remote store and activating it:"
-                ( set -x; NIX_SSHOPTS="-t" ${final.nixos-rebuild}/bin/nixos-rebuild switch --flake ${flake}#${machine} --target-host ${user}@${host} --use-remote-sudo )
+                ( set -x; NIX_SSHOPTS="-t" ${final.nixos-rebuild}/bin/nixos-rebuild ${switch} --flake ${flake}#${machine} --target-host ${user}@${host} --use-remote-sudo )
               '');
             in final.writeScript "deploy-${machine}.sh" script;
           in
@@ -49,9 +50,23 @@
                    (x:
                      {
                        type = "app";
-                       program = toString (mkDeployScript x);
+                       program = toString (mkDeployScript {
+                         machine = x;
+                         dryRun = false;
+                       });
                      }
                    )
+                   // nixpkgs.lib.genAttrs
+                      (map (a: a + "-dry-run") validMachines)
+                      (x:
+                        {
+                          type = "app";
+                          program = toString (mkDeployScript {
+                            machine = x;
+                            dryRun = true;
+                          });
+                        }
+                      )
                );
           };
         };