providers/docker: fix crash if host VM file can't be foundJ:wq

gs

CHANGELOG.md

@@ -88,6 +88,8 @@ BUG FIXES:
   - plugins/login: allow users to login with a token [GH-5145]
   - providers/docker: Build image from `/var/lib/docker` for more disk
       space on some systems. [GH-5302]
+  - providers/docker: Fix crash that could occur in some scenarios when
+      the host VM path changed.
   - providers/hyperv: allow users to configure memory, cpu count, and vmname [GH-5183]
   - providers/hyperv: import respects secure boot. [GH-5209]
   - providers/hyperv: only set EFI secure boot for gen 2 machines [GH-5538]

plugins/providers/docker/errors.rb

@@ -44,6 +44,10 @@ module VagrantPlugins
       class SyncedFolderNonDocker < DockerError
         error_key(:synced_folder_non_docker)
       end
+
+      class VagrantfileNotFound < DockerError
+        error_key(:vagrantfile_not_found)
+      end
     end
   end
 end

plugins/providers/docker/provider.rb

@@ -89,6 +89,10 @@ module VagrantPlugins
             vagrantfile_name: vf_file,
           )
 
+          # If there is no root path, then the Vagrantfile wasn't found
+          # and it is an error...
+          raise Errors::VagrantfileNotFound if !host_env.root_path
+
           host_env.machine(
             host_machine_name,
             host_env.default_provider(
@@ -149,8 +153,14 @@ module VagrantPlugins
       def state
         state_id = nil
         state_id = :not_created if !@machine.id
-        state_id = :host_state_unknown if !state_id && \
-          host_vm? && !host_vm.communicate.ready?
+
+        begin
+          state_id = :host_state_unknown if !state_id && \
+            host_vm? && !host_vm.communicate.ready?
+        rescue Errors::VagrantfileNotFound
+          state_id = :host_state_unknown
+        end
+
         state_id = :not_created if !state_id && \
           (!@machine.id || !driver.created?(@machine.id))
         state_id = driver.state(@machine.id) if @machine.id && !state_id

templates/locales/providers_docker.yml

@@ -196,3 +196,7 @@ en:
         The "docker" synced folder type can't be used because the  provider
         in use is not Docker. This synced folder type only works with the
         Docker provider. The provider this machine is using is: %{provider}
+      vagrantfile_not_found: |-
+        The configured host VM Vagrantfile could not be found. Please fix
+        the Vagrantfile for this Docker environment to point to a valid
+        host VM.