fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree.

[Sean Dooley]

We have the following setup at work which we have had working in the past.

Go Server - installed on a Mac mini
Go Agent - installed on a Mac mini
Go Agent - installed on a Windows machine

Recently we had to re-install our setup, and everything is working okay on the Go Server and the Mac mini Go Agent. Yet on the Windows Go Agent, I am getting the following error for all git repositories.

09:06:08.071 [go] Job Started: 2017-07-07 09:06:08 BST

09:06:08.071 [go] Start to prepare XXX/61/build/4/build on WinBuildMachine [C:\Go Agent]
09:06:08.086 [go] Start to update materials.

09:06:08.087 [go] Start updating files at revision XXXXXX from https://github.com/XXX/XXX.git
09:06:08.128 Error performing command: --- Command ---
git rev-parse --abbrev-ref HEAD
--- Environment ---
{}
--- INPUT ----


--OUTPUT ---
HEAD
--- ERROR ---
STDERR: fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree.
STDERR: Use '--' to separate paths from revisions, like this:
STDERR: 'git <command> [<revision>...] -- [<file>...]'
---

09:06:08.158 [go] Job completed XXX/61/build/4/build on WinBuildMachine [C:\Go Agent]

I have the Go Agent installed in C:\Go Agent.
I've had the Go Agent log on as a local service and an administrator user account.
Using Git Bash manually, I'm able to clone a private remote repository into C:\Go Agent\pipelines.

Installed software

Go Server 16.7.0
Go Agent 16.7.0
Git for Windows version 2.13.2

I'm unsure what else to try at this point so any help would be greatly appreciated.

[Sean Dooley]

After setting the Go Agent to run using a system account, and granting that system account full permissions to the Go Agent directory the pipeline has started working again.

Prior to this, I did manually clone one of the Git repositories into the pipeline directory, C:\Go Agent\pipelines, before re-running the pipeline. Whether that has made a difference, I'm not sure.