by matti

Run (exec) a command in shell and capture the output (stdout, stderr) and status code (exit status)

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A workaround for https://github.com/hashicorp/terraform/issues/610 <-- please 👍, meanwhile:

This module runs a command as a

and makes the stdout, stderr and exit status available as outputs (stored in triggers map). See an external data source version with more features at https://github.com/matti/terraform-shell-outputs (that runs on every apply, this one only runs once when the resource is created and if command is changed).


module "files" {
  source  = "matti/resource/shell"
  command = "ls -l"

output "my_files" { value = module.files.stdout }

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.


my_files = total 16 -rw-r--r-- 1 mpa staff 112 Feb 9 09:06 main.tf -rw-r--r-- 1 mpa staff 1007 Feb 9 09:07 terraform.tfstate

Full usage

module "first" {
  source = "matti/resource/shell"

command = ">/tmp/first echo I was here first" }

module "greeting" { source = "matti/resource/shell"

workaround for missing depends_on in modules

depends = [ module.first.id ]

environment = { GREETING = "hello" }

command = "echo $GREETING world from $(pwd) where /tmp/first has content: $(cat /tmp/first)" command_when_destroy = "echo $GREETING and good bye from $(pwd)"

runs on every apply

trigger = timestamp()

working_dir = "/tmp" }

output "greeting" { value = module.greeting.stdout }

Apply complete! Resources: 6 added, 0 changed, 0 destroyed.


greeting = hello world from /private/tmp where /tmp/first has content: I was here first

Additional examples

See tests and examples

Related issues:

  • https://github.com/hashicorp/terraform/issues/610
  • https://github.com/hashicorp/terraform/issues/17337
  • https://github.com/hashicorp/terraform/issues/6830
  • https://github.com/hashicorp/terraform/issues/17034
  • https://github.com/hashicorp/terraform/issues/10878
  • https://github.com/hashicorp/terraform/issues/8136
  • https://github.com/hashicorp/terraform/issues/18197
  • https://github.com/hashicorp/terraform/issues/17862

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