Use database locking to prevent concurrent Terraform jobs

Currently, the Terraform code uses chdir in the Ruby process to change
to the right working directory. This affects all threads in the
process, and thus means that all Terraform jobs conflict with each
other.

It would be good to fix this somehow, e.g. not changing directory, and
just specifying the directory in which to run Terraform when starting
it, but for now, use the advisory locks to force the jobs to run
sequentially.

4 files changed, 4 insertions, 4 deletions

diff --git a/app/models/backends/terraform_aws/backend_methods.rb b/app/models/backends/terraform_aws/backend_methods.rb
index 5ade46c..ca2bd83 100644
--- a/app/models/backends/terraform_aws/backend_methods.rb
+++ b/app/models/backends/terraform_aws/backend_methods.rb
@@ -80,7 +80,7 @@ module Backends::TerraformAws::BackendMethods
 
   def within_backend_terraform_working_directory(&block)
     with_advisory_lock(
-      "aws_backend_terraform_working_directory/#{id}"
+      "terraform"
     ) do
       TerraformWorkingDirectory.new(
         terraform_state_id,
diff --git a/app/models/backends/terraform_aws/mini_environment_methods.rb b/app/models/backends/terraform_aws/mini_environment_methods.rb
index 36fd70d..d0a8ab5 100644
--- a/app/models/backends/terraform_aws/mini_environment_methods.rb
+++ b/app/models/backends/terraform_aws/mini_environment_methods.rb
@@ -82,7 +82,7 @@ module Backends::TerraformAws::MiniEnvironmentMethods
 
   def within_terraform_working_directory(mini_environment, &block)
     with_advisory_lock(
-      "aws_mini_environment_terraform_working_directory/#{mini_environment.id}"
+      "terraform"
     ) do
       TerraformWorkingDirectory.new(
         mini_environment_state_id(mini_environment),
diff --git a/app/models/backends/terraform_libvirt/backend_methods.rb b/app/models/backends/terraform_libvirt/backend_methods.rb
index 06b89e4..d14affa 100644
--- a/app/models/backends/terraform_libvirt/backend_methods.rb
+++ b/app/models/backends/terraform_libvirt/backend_methods.rb
@@ -56,7 +56,7 @@ module Backends::TerraformLibvirt::BackendMethods
 
   def within_backend_terraform_working_directory(&block)
     with_advisory_lock(
-      "libvirt_backend_terraform_working_directory/#{id}"
+      "terraform"
     ) do
       TerraformWorkingDirectory.new(
         terraform_state_id,
diff --git a/app/models/backends/terraform_libvirt/mini_environment_methods.rb b/app/models/backends/terraform_libvirt/mini_environment_methods.rb
index 9b68d49..ef2b4c1 100644
--- a/app/models/backends/terraform_libvirt/mini_environment_methods.rb
+++ b/app/models/backends/terraform_libvirt/mini_environment_methods.rb
@@ -79,7 +79,7 @@ module Backends::TerraformLibvirt::MiniEnvironmentMethods
 
   def within_terraform_working_directory(mini_environment, &block)
     with_advisory_lock(
-      "libvirt_mini_environment_terraform_working_directory/#{mini_environment.id}"
+      "terraform"
     ) do
       TerraformWorkingDirectory.new(
         mini_environment_state_id(mini_environment),