Efficient development with the bosh-agent

[anshrupani]

This PR provides suggestions on how to test local changes in the bosh-agent in development environments. Any feedback or ideas are welcome :)

[mvach]

nice

[ten4o]

Hi @anshrupani, I'm an apple silicon user and I don't understand why enabling CGO_ENABLE is significant. Can you elaborate a little bit more? It seems more relevant for me to mention that I should build with GOOS=linux and GOARCH=amd64.

[jpalermo]

I'd agree, although I'm not super knowledgable in the details of CGO, if you're on apple silicon you'll need to be building binaries for linux if you want to use them on a VM, and CGO gets disabled when cross compiling.

It does seem that building with CGO disabled fails on apple silicon if you are targeting apple silicon as the OS, but I don't see anything in the dev docs about why you'd want to be building an apple silicon agent.

[anshrupani]

I am not very familiar with cross-compiling across various architectures, but weirdly enough I found the exact same issue I faced (with CGO_ENABLED = 0) on a github issue reported towards cloudfoundry/gosigar. I followed the suggestion there, and it worked for me. However, setting GOOS=linux and GOARCH=amd64 does not work for me. Here's the error I get in general without setting CGO_ENABLED = 0:

Building with go version go1.20.6 darwin/arm64...
# github.com/cloudfoundry/gosigar
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:20:12: cpuUsage.Get undefined (type Cpu has no field or method Get)
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:30:14: cpuUsage.Get undefined (type Cpu has no field or method Get)
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:49:11: l.Get undefined (type LoadAverage has no field or method Get)
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:55:11: m.Get undefined (type Mem has no field or method Get)
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:61:11: m.GetIgnoringCGroups undefined (type Mem has no field or method GetIgnoringCGroups)
vendor/github.com/cloudfoundry/gosigar/concrete_sigar.go:67:11: s.Get undefined (type Swap has no field or method Get)
vendor/github.com/cloudfoundry/gosigar/sigar_shared.go:12:21: procTime.Get undefined (type *ProcTime has no field or method Get)