### Terraform Version ```shell Terraform v1.15.8 on darwin_arm64 Your version of Terraform is out of date! The latest version is 1.15.9. You can update by downloading from https://developer.hashicorp.com/terraform/install --- Also tested and reproducible with versions `1.13.5` and `1.15.9`, same OS/arch. ``` ### Terraform Configuration Files ```terraform module "fixture" { source = "git::file:///absolute/path/to/fixture-module.git" } ``` ### Debug Output Trace: ``` 2026-08-21T15:42:32.379+0100 [INFO] Terraform version: 1.15.8 2026-08-21T15:42:32.379+0100 [DEBUG] using github.com/hashicorp/go-tfe v1.105.0 2026-08-21T15:42:32.379+0100 [DEBUG] using github.com/hashicorp/hcl/v2 v2.24.0 2026-08-21T15:42:32.379+0100 [DEBUG] using github.com/hashicorp/terraform-svchost v0.2.1 2026-08-21T15:42:32.379+0100 [DEBUG] using github.com/zclconf/go-cty v1.18.0 2026-08-21T15:42:32.379+0100 [INFO] Go runtime version: go1.26.5 2026-08-21T15:42:32.379+0100 [INFO] CLI args: []string{"terraform", "init", "-input=false"} 2026-08-21T15:42:32.379+0100 [TRACE] Stdout is not a terminal 2026-08-21T15:42:32.379+0100 [TRACE] Stderr is not a terminal 2026-08-21T15:42:32.379+0100 [TRACE] Stdin is not a terminal 2026-08-21T15:42:32.379+0100 [DEBUG] Attempting to open CLI config file: /.terraformrc 2026-08-21T15:42:32.379+0100 [INFO] Loading CLI configuration from /.terraformrc 2026-08-21T15:42:32.379+0100 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2026-08-21T15:42:32.379+0100 [DEBUG] ignoring non-existing provider search directory /.terraform.d/plugins 2026-08-21T15:42:32.379+0100 [DEBUG] ignoring non-existing provider search directory /Library/Application Support/io.terraform/plugins 2026-08-21T15:42:32.379+0100 [DEBUG] ignoring non-existing provider search directory /Library/Application Support/io.terraform/plugins 2026-08-21T15:42:32.379+0100 [INFO] CLI command args: []string{"init", "-input=false"} 2026-08-21T15:42:32.381+0100 [TRACE] Meta.Backend: no config given or present on disk, so returning nil config 2026-08-21T15:42:32.381+0100 [TRACE] Meta.Backend: backend has not previously been initialized in this working directory 2026-08-21T15:42:32.381+0100 [TRACE] Meta.Backend: using default local state only (no backend configuration, and no existing initialized backend) 2026-08-21T15:42:32.381+0100 [TRACE] Meta.Backend: instantiated backend of type 2026-08-21T15:42:32.381+0100 [DEBUG] checking for provisioner in "." 2026-08-21T15:42:32.381+0100 [DEBUG] checking for provisioner in "//bin" 2026-08-21T15:42:32.381+0100 [TRACE] Meta.Backend: backend does not support operations, so wrapping it in a local backend 2026-08-21T15:42:32.381+0100 [TRACE] backend/local: state manager for workspace "default" will: - read initial snapshot from terraform.tfstate - write new snapshots to terraform.tfstate - create any backup at terraform.tfstate.backup 2026-08-21T15:42:32.381+0100 [TRACE] statemgr.Filesystem: reading initial snapshot from terraform.tfstate 2026-08-21T15:42:32.381+0100 [TRACE] statemgr.Filesystem: snapshot file has nil snapshot, but that's okay 2026-08-21T15:42:32.381+0100 [TRACE] statemgr.Filesystem: read nil snapshot 2026-08-21T15:42:32.381+0100 [TRACE] ModuleInstaller: installing child modules for . into .terraform/modules 2026-08-21T15:42:32.381+0100 [TRACE] terraform.NewContext: starting 2026-08-21T15:42:32.381+0100 [TRACE] terraform.NewContext: complete 2026-08-21T15:42:32.381+0100 [TRACE] building graph for terraform dependencies 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.RootVariableTransformer 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.ModuleTransformer 2026-08-21T15:42:32.381+0100 [TRACE] ModuleTransformer: Added module.fixture as *terraform.nodeInstallModule 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.LocalTransformer 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.ReferenceTransformer 2026-08-21T15:42:32.381+0100 [DEBUG] ReferenceTransformer: "module.fixture" references: [] 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.TransformFilter 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.variableValidationTransformer 2026-08-21T15:42:32.381+0100 [TRACE] variableValidationTransformer: adding validation nodes for any existing variable evaluation nodes 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.RootTransformer 2026-08-21T15:42:32.381+0100 [TRACE] Executing graph transform *terraform.TransitiveReductionTransformer 2026-08-21T15:42:32.381+0100 [TRACE] Completed graph transform: module.fixture - *terraform.nodeInstallModule root - terraform.graphNodeRoot module.fixture - *terraform.nodeInstallModule ------ 2026-08-21T15:42:32.381+0100 [DEBUG] Starting graph walk: walkInit 2026-08-21T15:42:32.381+0100 [TRACE] vertex "module.fixture": starting visit (*terraform.nodeInstallModule) 2026-08-21T15:42:32.382+0100 [TRACE] vertex "module.fixture": belongs to 2026-08-21T15:42:32.382+0100 [DEBUG] Module installer: begin fixture 2026-08-21T15:42:37.383+0100 [TRACE] dag/walk: vertex "root" is waiting for "module.fixture" ``` Error: ``` Initializing the backend... Initializing modules... SIGQUIT: quit PC=0x18f26350c m=0 sigcode=0 goroutine 46 [runnable]: github.com/hashicorp/go-version.(*Version).bytes(0x0) github.com/hashicorp/go-version@v1.9.0/version.go:442 github.com/hashicorp/go-version.(*Version).String(...) github.com/hashicorp/go-version@v1.9.0/version.go:437 fmt.(*pp).handleMethods(...) fmt.(*pp).printArg(...) fmt.(*pp).doPrintf(...) log.Printf(...) github.com/hashicorp/terraform/internal/initwd.(*ModuleInstaller).moduleInstallWalker.func2(...) github.com/hashicorp/terraform/internal/initwd/module_install.go:284 github.com/hashicorp/terraform/internal/terraform.(*nodeInstallModule).Execute(...) ``` ### Expected Behavior A second `terraform init` should reuse the installed Git module and complete successfully. ### Actual Behavior The first initialization succeeds. The second initialization hangs after: ```shell Initializing the backend... Initializing modules... ``` ### Steps to Reproduce ```shell work="$(mktemp -d)" repo="$work/fixture-module.git" module="$work/module" root="$work/root" mkdir -p "$module" "$root" git init --bare "$repo" git -C "$module" init printf 'terraform {}\n' > "$module/main.tf" git -C "$module" add main.tf git -C "$module" -c user.name=fixture -c user.email=fixture@example.invalid commit -m fixture git -C "$module" remote add origin "file://$repo" git -C "$module" push origin HEAD:main printf 'module "fixture" {\n source = "git::file://%s"\n}\n' "$repo" > "$root/main.tf" terraform -chdir="$root" init -input=false terraform -chdir="$root" init -input=false ``` ### Additional Context Please take this with a grain of salt; while I'm a long time `terraform` user this is one of the few times I actually looked at the code. It seems like this might have been an issue for some time, but I only recently noticed it after upgrading to `terragrunt v1`. I'm not 100% sure of the mechanism that triggered the behavior, but seems to be tied to the new `.terragrunt-cache` directory. The module manifest generated by Terraform has no `Version` field for the `git::` source (I'm not sure this is to be expected for a non-registry module, or is a possible defect). I actually got around the problem in a local build by guarding the version check against `nil`, something like: ```go if record.Version != nil { log.Printf( "[TRACE] ModuleInstaller: Module installer: %s %s already installed in %s", key, record.Version, record.Dir, ) } else { log.Printf( "[TRACE] ModuleInstaller: Module installer: %s already installed in %s", key, record.Dir, ) } ``` Another way I found to bypass the problem is to run `terraform init -get=false` whenever I don't actually need provider refreshes. ### References _No response_ ### Generative AI / LLM assisted development? Investigation and local fix done manually, test config produced with Copilot.