Allow piping into kamal exec #1485

lib/kamal/commands/accessory.rb

@@ -55,14 +55,14 @@ class Kamal::Commands::Accessory < Kamal::Commands::Base
 
   def execute_in_existing_container(*command, interactive: false)
     docker :exec,
-      ("-it" if interactive),
+      (docker_interactive_args if interactive),
       service_name,
       *command
   end
 
   def execute_in_new_container(*command, interactive: false)
     docker :run,
-      ("-it" if interactive),
+      (docker_interactive_args if interactive),
       "--rm",
       *network_args,
       *env_args,

lib/kamal/commands/app/execution.rb

@@ -1,7 +1,7 @@
 module Kamal::Commands::App::Execution
   def execute_in_existing_container(*command, interactive: false, env:)
     docker :exec,
-      ("-it" if interactive),
+      (docker_interactive_args if interactive),
       *argumentize("--env", env),
       container_name,
       *command
@@ -9,7 +9,7 @@ module Kamal::Commands::App::Execution
 
   def execute_in_new_container(*command, interactive: false, detach: false, env:)
     docker :run,
-      ("-it" if interactive),
+      (docker_interactive_args if interactive),
       ("--detach" if detach),
       ("--rm" unless detach),
       "--network", "kamal",

lib/kamal/commands/base.rb

@@ -122,5 +122,9 @@ module Kamal::Commands
       def ensure_local_buildx_installed
         docker :buildx, "version"
       end
+
+      def docker_interactive_args
+        STDIN.isatty ? "-it" : "-i"
+      end
   end
 end