Terragrunt: "slice bounds out of range" error when no subcommand provided

[philsttr]

When terragrunt is called with a command that requires a subcommand, but no subcommand is provided, terragrunt errors with a "slice bounds out of range" error as below:

$ terragrunt state
[terragrunt] [**] 2017/06/21 11:37:48 Running command: terraform --version
[terragrunt] 2017/06/21 11:37:48 Reading Terragrunt config file at **/terraform.tfvars
[terragrunt] 2017/06/21 11:37:48 runtime.errorString runtime error: slice bounds out of range
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/errors/errors.go:72 (0x461801)
/usr/local/go/src/runtime/asm_amd64.s:479 (0x45632c)
        call32: NO_LOCAL_POINTERS;                      \
/usr/local/go/src/runtime/panic.go:458 (0x428b93)
        gopanic:
/usr/local/go/src/runtime/panic.go:34 (0x4274ed)
        panicslice: panicCheckMalloc(sliceError)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/cli/cli_app.go:202 (0x45cb01)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/cli/cli_app.go:182 (0x45c410)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/cli/cli_app.go:163 (0x45c105)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/vendor/github.com/urfave/cli/app.go:485 (0x48ac34)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/vendor/github.com/urfave/cli/app.go:259 (0x488a4f)
/home/ubuntu/.go_workspace/src/github.com/gruntwork-io/terragrunt/main.go:20 (0x4010c4)
/usr/local/go/src/runtime/proc.go:183 (0x42a864)
        main: }
/usr/local/go/src/runtime/asm_amd64.s:2086 (0x458e51)
        goexit: MOVQ DI, (R8)

[terragrunt] 2017/06/21 11:37:48 Unable to determine underlying exit code, so Terragrunt will exit with error code 1

This happens for the following commands

• terragrunt state
• terragrunt force-unlock
• terragrunt debug

[brikis98]

Ah, definitely a bug. Thanks for reporting. Probably a straight forward fix by checking bounds here: https://github.com/gruntwork-io/terragrunt/blob/master/cli/cli_app.go#L194-L207. PRs welcome, if anyone has a few minutes!

[kcrouch]

I was stuck on doing a "terragrunt force-unlock" and this helped be realize that you need to specify the lock ID as an argument to "terragrunt force-unlock". Cheers!

[woz5999]

+1

[sarkis]

Fixed with https://github.com/gruntwork-io/terragrunt/pull/420 and merged in as of terragrunt v0.14.1

[brikis98]

Thx @sarkis!