go generate fails with mdatagen error

[jlg-io]

Component(s)

receiver/vcenter

What happened?

Description

Trying to add a new metric for an existing receiver (vcenterreceiver) following CONTRIBUTING.md and got the following error :

doc.go:4: running "mdatagen": exec: "mdatagen": executable file not found in $PATH

Steps to Reproduce

• Run cd receiver/redisreceiver
• Run go generate ./...

Expected Result

It should update documentation and the generated_* files

Actual Result

doc.go:4: running "mdatagen": exec: "mdatagen": executable file not found in $PATH

Additional tests

I also tried to run make generate from the root directory, it fails with a similar error:

running go generate ./... in ./cmd/telemetrygen
config.go:5: running "mdatagen": exec: "mdatagen": executable file not found in $PATH
make[1]: *** [Makefile:158: for-all] Error 1
make[1]: Leaving directory '/<MY_DEV_DIR>/opentelemetry-collector-contrib'
make: *** [Makefile:287: generate] Error 2

Collector version

v0.102-2.0

Environment information

Environment

OS: Ubuntu 20.04 in WSL2 (Windows 11)

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

This open issue may be related: open-telemetry/opentelemetry-collector#9281

[github-actions]

Pinging code owners:

• receiver/vcenter: @djaglowski @schmikei @StefanKurek

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[crobert-1]

Hello @jlg-io, it looks like you need to add GOBIN to your shell's PATH. mdatagen is installed to your GOBIN directory when you run make generate.

GOBIN documentation

[jlg-io]

Thanks @crobert-1, my GOBIN env was empty... Here what I've added to $HOME/.zshrc (I use zsh, would be different if you bash), in case it can help someone else:

export GOPATH=$HOME/go
export GOBIN=$GOPATH/bin
export PATH=$PATH:$GOPATH
export PATH=$PATH:$GOBIN