Build no longer works on modern go

[bobpaul]

I had to specify the *.go file to use.

Problem

$ make
go: cannot find main module, but found .git/config in /home/bobpaul/puntar
	to create a module there, run:
	go mod init
go: cannot find main module, but found .git/config in /home/bobpaul/puntar
	to create a module there, run:
	go mod init
Building: 
go build -trimpath
go: cannot find main module, but found .git/config in /home/bobpaul/puntar
	to create a module there, run:
	go mod init
make: *** [Makefile:8: puntar] Error 1

$ go version
go version go1.23.2 linux/ppc64le

$ go list -f '{{.GoFiles}}'
go: cannot find main module, but found .git/config in /home/bobpaul/aur/puntar
	to create a module there, run:
	go mod init

Work Around

Specify the required files. So for linux, do:

$ go build -trimpath np_linux.go puntar.go

$ ./puntar -help
Usage of ./puntar:
  -dir string
    	destination directory (default ".")
  -file string
    	tar file to extract
  -update
    	update existing target
  -verbose
    	enable verbose logging
  -workers uint
    	number of concurrent workers (default 4)

I'm not familiar with the go build system, but I know from other projects that there's a "go" way to do this such that make isn't even needed.

[bobpaul]

Looks like this project builds unmodified with go v1.13 - v1.15. building in docker I suppose is an easy way to get an older version. <= v12 don't recognize -trimpath and >= v16 don't know which files to build.

$ docker run --rm -it --volume ./:/usr/src/app --workdir /usr/src/app golang:1.15 make
$ mv app puntar
$ puntar --help
Building: np_linux.go puntar.go
go build -trimpath
Usage of puntar:
  -dir string
    	destination directory (default ".")
  -file string
    	tar file to extract
  -update
    	update existing target
  -verbose
    	enable verbose logging
  -workers uint
    	number of concurrent workers (default 4)

Sadly, regardless which version of go I use to build it on both x64-64 and ppc64le it does not work. puntar -verbose -dir . -file file.tar exits immediately with no errors and nothing is extracted.