I seem to be confused about how external works. I tried:

data "external" "local_key" {
  program = [
    "ssh-keygen", "-y", "-f ~/.ssh/id_rsa"
  ]
}

This gives me:

failed to execute "ssh-keygen": ~/.ssh/id_rsa: No such file or directory

Which presumably happens because ~ expansion doesn't. ssh-keygen -y -f ~/.ssh/id_rsa works normally. So instead I tried invoking bash like:

data "external" "local_key" {
  program = [
    "bash"
  ]

  query {
    "-c" = "ssh-keygen -y -f ~/.ssh/id_rsa"
  }
}

I'm still getting the same issue. I realize I can just pass it as a var to terraform from the outside, but I'm still curious what the solution is.

I seem to be confused about how external works. I tried:

data "external" "local_key" {
  program = [
    "ssh-keygen", "-y", "-f ~/.ssh/id_rsa"
  ]
}

This gives me:

failed to execute "ssh-keygen": ~/.ssh/id_rsa: No such file or directory

Which presumably happens because ~ expansion doesn't. ssh-keygen -y -f ~/.ssh/id_rsa works normally. So instead I tried invoking bash like:

data "external" "local_key" {
  program = [
    "bash"
  ]

  query {
    "-c" = "ssh-keygen -y -f ~/.ssh/id_rsa"
  }
}

I'm still getting the same issue. I realize I can just pass the output as a var to terraform from the outside, but I'm still curious what the solution is.