Terraform 1.4+ issues

[nitrocode]

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The new terraform 1.4.x has a few problems that users may run into

• output is hidden if there are no changes by default Atlantis plan with terraform 1.4.0 returns zero output when nothing is changed #3200
• terraform lock files are mandatory unless an env variable is set provider cache becomes ineffective with 1.4.0-alpha release hashicorp/terraform#32205
• tbd

If 1.4.x is desired and committing the lockfile is desired then do the following

terraform providers lock \
  -platform=linux_arm64 \ 
  -platform=linux_amd64 \
  -platform=darwin_amd64 \
  -platform=darwin_arm64

If 1.4.x is desired but locking is not desired, then set the env var

TF_PLUGIN_CACHE_MAY_BREAK_DEPENDENCY_LOCK_FILE=true

If 1.3.x pinning is desired, do all of the following

1. set flag ATLANTIS_DEFAULT_TF_VERSION=1.3.9

   • This will only apply to dirs that do NOT have a required_version set in hcl

2. If using required_version then also set to ~> 1.3.0 per dir

   # versions.tf
   terraform {
     required_version = "~> 1.3.0"
   }

   • The atlantis version will need to be 0.23.0 or later for the above to work (fix: Use hashicorp/go-version to resolve ~> 1.0 to 1.x instead of 1.0.x #3153)
   • The required_version always overrides the default version. See more details here.
   • The patch is relevant in ~> 1.3.0 to ensure it matches on only 1.3.x whereas ~> 1.3 may match to 1.4
   • Unable to override required_version terraform version using a flag #3199