Build an app on Heroku using Go Module. change the root directory

Question

I choose the way Go Module Specifics to build my Go app.

When I set the directory like below, it works well.

main.go
go.mod
go.sum
README.md

where go.mod

module xxx

// +heroku goVersion go1.18
go 1.18
...

But I want to put the all source code in the src folder. and push to Heroku, it will wrong

README.md
📂 src
  - main.go
  - go.mod
  - go.sum

Is there a way to do this?

Answer 1

Your go.mod (and go.sum ) files need to be in the codebase root directory . Buildpack will search the codebase for main package(s) and compile them all. You can override this behavior (what get's build) by using +heroku install build directive:

When using go modules, this buildpack will search the code base for main packages, ignoring any in vendor/, and will automatically compile those packages. If this isn't what you want you can specify specific package spec(s) via the go.mod file's // +heroku install directive (see below).

README.md
- go.mod
- go.sum
📂 src
  - main.go

I don't think you can use Go Module Specifics with go.mod file on deeper level than root in Heroku but your code can indeed be in subdirectory.