bug: running commands on stacks from outside dir breaks

[katcipis]

Using:

terrastack run -b <full path> <command>

From outside the stack base dir breaks, while inside the stack base dir it works, here is a small script that reproduces the problem:

#!/bin/bash

set -o errexit
set -o nounset

stack_absolute_path=$(mktemp -d)

cd "${stack_absolute_path}"

mkdir stack1
touch stack1/terrastack

mkdir stack2
touch stack2/terrastack

# Running with absolute path basedir, inside stack, works:
terrastack run -b "${stack_absolute_path}" ls

# Running with absolute path basedir, outside stack, breaks:
cd ..
terrastack run -b "${stack_absolute_path}" ls

Running this script on a empty dir results in:

Running on all stacks:
[stack1] running /bin/ls
terrastack

[stack2] running /bin/ls
terrastack

Running on all stacks:
[stack1] running /bin/ls
2021/11/05 19:41:38 warn: failed to execute command: chdir stack1: no such file or directory

[stack2] running /bin/ls
2021/11/05 19:41:38 warn: failed to execute command: chdir stack2: no such file or directory

2021/11/05 19:41:38 warn: some (2) commands failed

Version:

terrastack version
0.0.1

Which I don't think is precise since we didn't release terrastack yet =P, so here is the git reference used to build (latest at the time I'm writing this): 489c57e2a40c6a0965424a762b4c8f78b4dc838a.

Kudos to @i4ki for finding the bug, I just reproduced/reported it.