Improved resilience of the VirtualBox driver delete_unused_host_only_networks function by

ignoring VMs that may have been deleted between the calls to
'vboxmanage list vms' and 'vboxmanage showvminfo'

plugins/providers/virtualbox/driver/version_4_0.rb

@@ -85,12 +85,19 @@ module VagrantPlugins
 
           execute("list", "vms").split("\n").each do |line|
             if vm_name = line[/^".+?"\s+\{(.+?)\}$/, 1]
+              begin
                 info = execute("showvminfo", vm_name, "--machinereadable", retryable: true)
                 info.split("\n").each do |line|
                   if network_name = line[/^hostonlyadapter\d+="(.+?)"$/, 1]
                     networks.delete(network_name)
                   end
                 end
+              rescue Vagrant::Errors::VBoxManageError => e
+                raise if !e.extra_data[:stderr].include?("VBOX_E_OBJECT_NOT_FOUND")
+
+                # VirtualBox could not find the vm. It may have been deleted
+                # by another process after we called 'vboxmanage list vms'? Ignore this error.
+              end
             end
           end
 

plugins/providers/virtualbox/driver/version_4_1.rb

@@ -176,12 +176,19 @@ module VagrantPlugins
 
           execute("list", "vms").split("\n").each do |line|
             if vm = line[/^".+?"\s+\{(.+?)\}$/, 1]
+              begin
                 info = execute("showvminfo", vm, "--machinereadable", retryable: true)
                 info.split("\n").each do |line|
                   if adapter = line[/^hostonlyadapter\d+="(.+?)"$/, 1]
                     networks.delete(adapter)
                   end
                 end
+              rescue Vagrant::Errors::VBoxManageError => e
+                raise if !e.extra_data[:stderr].include?("VBOX_E_OBJECT_NOT_FOUND")
+
+                # VirtualBox could not find the vm. It may have been deleted
+                # by another process after we called 'vboxmanage list vms'? Ignore this error.
+              end
             end
           end
 

plugins/providers/virtualbox/driver/version_4_2.rb

@@ -83,12 +83,19 @@ module VagrantPlugins
 
           execute("list", "vms").split("\n").each do |line|
             if line =~ /^".+?"\s+\{(.+?)\}$/
+              begin
                 info = execute("showvminfo", $1.to_s, "--machinereadable", retryable: true)
                 info.split("\n").each do |inner_line|
                   if inner_line =~ /^hostonlyadapter\d+="(.+?)"$/
                     networks.delete($1.to_s)
                   end
                 end
+              rescue Vagrant::Errors::VBoxManageError => e
+                raise if !e.extra_data[:stderr].include?("VBOX_E_OBJECT_NOT_FOUND")
+
+                # VirtualBox could not find the vm. It may have been deleted
+                # by another process after we called 'vboxmanage list vms'? Ignore this error.
+              end
             end
           end
 

plugins/providers/virtualbox/driver/version_4_3.rb

@@ -180,12 +180,19 @@ module VagrantPlugins
 
           execute("list", "vms", retryable: true).split("\n").each do |line|
             if line =~ /^".+?"\s+\{(.+?)\}$/
+              begin
                 info = execute("showvminfo", $1.to_s, "--machinereadable", retryable: true)
                 info.split("\n").each do |inner_line|
                   if inner_line =~ /^hostonlyadapter\d+="(.+?)"$/
                     networks.delete($1.to_s)
                   end
                 end
+              rescue Vagrant::Errors::VBoxManageError => e
+                raise if !e.extra_data[:stderr].include?("VBOX_E_OBJECT_NOT_FOUND")
+
+                # VirtualBox could not find the vm. It may have been deleted
+                # by another process after we called 'vboxmanage list vms'? Ignore this error.
+              end
             end
           end
 

plugins/providers/virtualbox/driver/version_5_0.rb

@@ -176,12 +176,19 @@ module VagrantPlugins
 
           execute("list", "vms", retryable: true).split("\n").each do |line|
             if line =~ /^".+?"\s+\{(.+?)\}$/
+              begin
                 info = execute("showvminfo", $1.to_s, "--machinereadable", retryable: true)
                 info.split("\n").each do |inner_line|
                   if inner_line =~ /^hostonlyadapter\d+="(.+?)"$/
                     networks.delete($1.to_s)
                   end
                 end
+              rescue Vagrant::Errors::VBoxManageError => e
+                raise if !e.extra_data[:stderr].include?("VBOX_E_OBJECT_NOT_FOUND")
+
+                # VirtualBox could not find the vm. It may have been deleted
+                # by another process after we called 'vboxmanage list vms'? Ignore this error.
+              end
             end
           end