Reintroduce shell_command; resolves #19

Thus we are no longer dependent on global bash.

CHANGELOG.md

@@ -2,7 +2,9 @@
 
 ## Unreleased
 
-- Add `testScript` option for adding flake checks based on nixosTest library.
+- #18: Add `testScript` option for adding flake checks based on nixosTest library.
+- Fixes
+    - #19: Add pkgs.bash to process-compose's path, so a global bash is not required.
 
 ## 0.1.0 (Jun 12, 2023)
 

nix/process-compose/settings/default.nix

@@ -41,15 +41,29 @@ in
             example = "./pc.log";
           };
 
+          shell = {
+            shell_argument = mkOption {
+              type = types.str;
+              default = "-c";
+              example = "-c";
+            };
+            shell_command = mkOption {
+              type = types.str;
+              description = ''
+                The shell to use to run the process `command`s.
+
+                For reproducibility across systems, by default this uses
+                `pkgs.bash`.
+              '';
+              default = lib.getExe pkgs.bash;
+            };
+          };
+
           version = mkOption {
             type = types.nullOr types.str;
             default = null;
             example = "0.5";
           };
-
-          # NOTE: We don't allow the `shell` option because it meaningless in
-          # lieu of our use of pkgs.writeShellApplication (see command.nix).
-
         };
       };
       example =

nix/process-compose/test.nix

@@ -17,12 +17,11 @@ in
     };
     outputs.check = mkOption {
       type = types.nullOr types.package;
-      default = if config.testScript == null then null else 
+      default = if config.testScript == null then null else
         pkgs.nixosTest {
           inherit (config) testScript;
           name = "process-compose-${name}-test";
           nodes.machine = {
-            environment.systemPackages = [ pkgs.bash ]; # process-compose requires it.
             systemd.services.process-compose = {
               enable = true;
               wantedBy = [ "default.target" ];
@@ -32,9 +31,7 @@ in
                   name = "process-compose-${name}";
                   text = ''
                     set -x
-                    echo "Launching procese-compose on ${name} ..."
-                    # make bash available to process-compose
-                    export PATH=/run/current-system/sw/bin:$PATH
+                    echo "Launching process-compose on ${name} ..."
                     ${lib.getExe config.outputs.package} -t=false
                   '';
                 });
@@ -42,6 +39,6 @@ in
             };
           };
         };
-    }; 
+    };
   };
-}
+}