Surface error messages from underlying git commands

[yorinasub17]

Describe the bug Boilerplate doesn't surface git errors to the user, making it difficult to understand some error messages.

To Reproduce Run boilerplate targeting a remote template without any git credentials loaded. In this scenario, the error message reported by boilerplate looks like the following:

ERROR: Could not find boilerplate.yml in https:/github.com:<org>/<repo>/templates/additional-apps?ref=v0.4.2/boilerplate.yml and the missing-config-action flag is set to exit

[yorinasub17]

After some testing, I was not able to reproduce this error. As far as I can tell, we are bubbling up the underlying git error code.

I tried a few things:

• Directly passing in a --template-url:

  %~> boilerplate --template-url https://github.com/yorinasub17/i-dont-exist//templates/additional-apps\?ref\=v0.4.2 --output-folder ./out
  [boilerplate] 2022/08/02 12:37:47 Downloading templates from https://github.com/yorinasub17/i-dont-exist//templates/additional-apps?ref=v0.4.2 to /var/folders/36/ljcx66pj73zd3sq1r1tsr_300000gn/T/boilerplate-cache2375334331
  [boilerplate] 2022/08/02 12:37:48 Cleaning up working directory.
  ERROR: bad response code: 404

• Passing a template that has a dependency that is a 404

  %~> boilerplate --template-url ./examples/test --output-folder out
  [boilerplate] 2022/08/02 12:39:05 Loading boilerplate config from examples/test/boilerplate.yml
  [boilerplate] 2022/08/02 12:39:05 Loading boilerplate config from examples/test/boilerplate.yml
  This boilerplate template has a dependency! Run boilerplate on dependency docs with template folder https://github.com/yorinasub17/i-dont-exist//templates/additional-apps?ref=v0.5.2 and output folder ./docs? (y/n) : y
  [boilerplate] 2022/08/02 12:39:09 Processing dependency docs, with template folder  and output folder out/docs
  [boilerplate] 2022/08/02 12:39:09 Downloading templates from https://github.com/yorinasub17/i-dont-exist//templates/additional-apps?ref=v0.5.2 to /var/folders/36/ljcx66pj73zd3sq1r1tsr_300000gn/T/boilerplate-cache359587952
  [boilerplate] 2022/08/02 12:39:09 Cleaning up working directory.
  ERROR: bad response code: 404

That said, the 404 error message can probably be improved.

[mansoshaik-deloitte]

@yorinasub17 I'm using boilerplate version v0.4.3

dependencies:
  - name: guestbook
    output-folder: './guestbook'
    template-url: git@github.com/JDoe/guestbook.git//nginx?ref=v0.1.0

The above configuration failed due to malformed Git SSH Url where the separator between the domain name and the organization should be : but the error thrown by boilerplate is misleading.

boilerplate] 2022/08/08 13:53:05 Processing dependency guestbook, with template folder git@github.com/JDoe/guestbook.git//nginx?ref=v0.1.0 and output folder guestbook
[boilerplate] 2022/08/08 13:53:05 Loading boilerplate config from boilerplate.yml
ERROR: Could not find boilerplate.yml in git@github.com/JDoe/guestbook.git//nginx?ref=v0.1.0/boilerplate.yml and the missing-config-action flag is set to exit

[yorinasub17]

Thank you for the reproducible case. That makes more sense as to what you were seeing. I'll work on adding some better checks for this case!