Upgrading GO version to 1.13 is not a cakewalk!!!

Why?

Be aware that upgrading the version of Go from older versions to 1.13 is not so easy, it comes with new difficulties due to these recent changes:

• Version validation:
  • In 1.13 Go performs additional validation on the requested version string. The +incompatible version annotation bypasses the requirement of semantic import versioning for repositories that predate the introduction of modules. The go command now verifies that such a version does not include an explicit go.mod file. Refer for more info https://golang.org/doc/go1.13#/version-validation
• Changes to the Environment Variable https://golang.org/doc/go1.13#/proxy-vars
• Proxy Servers:
  • If your company having private repositories then you need to set these below environment variables
    • go env -w GONOSUMDB="****" # use your github or bitbucket repo base url
    • go env -w GONOPROXY="****" # use your github or bitbucket repo base url
    • go env -w GOPROXY="https://proxy.golang.org,direct" #this should already be the default
    • go env -w GOPRIVATE="****" # use your github or bitbucket repo base url

Before start upgrading first clean your mod cache:
GO111MODULE=on go clean -modcache

I will be listing out the possible errors and it's respective solutions as well.

#1: If you are using go-micro framework

go: bitbucket.org/****/**** requires
    github.com/micro/go-plugins@v0.25.0 requires
    gocloud.dev@v0.10.0 requires
    contrib.go.opencensus.io/exporter/ocagent@v0.4.2 requires
    github.com/census-instrumentation/opencensus-proto@v0.1.0-0.20181214143942-ba49f56771b8: invalid pseudo-version: version before v0.1.0 would have   negative patch number

fix:

Add this at last in your `go.mod` file
replace github.com/census-instrumentation/opencensus-proto v0.1.0-0.20181214143942-ba49f56771b8 => github.com/census-instrumentation/opencensus-proto v0.0.3-0.20181214143942-ba49f56771b8

#2: Protobuf related problems

go: k8s.io/api@v0.0.0-20190726022912-69e1bce1dad5 requires
    github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9: invalid pseudo-version: revision is shorter than canonical (65acae22fc9d)
S

fix:

Add this at last in your `go.mod` file
replace github.com/gogo/protobuf v0.0.0-20190410021324-65acae22fc9 => github.com/gogo/protobuf v0.0.0-20190723190241-65acae22fc9d

#3: github.com/instana/go-sensor related

fix:

Add this at last in your `go.mod` file
replace github.com/instana/go-sensor => github.com/instana/golang-sensor v1.5.0

#4: Issue with mailgun-go

fix:

Add this at last in your `go.mod` file
replace github.com/mailgun/mailgun-go => github.com/mailgun/mailgun-go v0.0.0-20180718145431-bbe57f98d550

#5: Issue with hashicorp ambiguous import issue

cannot load github.com/hashicorp/consul/api: ambiguous import: found github.com/hashicorp/consul/api in multiple modules:
        github.com/hashicorp/consul v1.4.4 (/Users/vasubabujinagam/go/pkg/mod/github.com/hashicorp/consul@v1.4.4/api)
        github.com/hashicorp/consul/api v1.1.0 (/Users/vasubabujinagam/go/pkg/mod/github.com/hashicorp/consul/api@v1.1.0)
S

fix:

Add this at last in your `go.mod` file
replace github.com/hashicorp/consul => github.com/hashicorp/consul v1.5.1

if you are facing anything other than this, please post in the comment section.