Using WSL Ubuntu 20.04.5 LTS

[Kuchiriel]

go get github.com/ericchiang/pup

golang.org/x/sys/unix

go/src/golang.org/x/sys/unix/syscall.go:83:16: undefined: unsafe.Slice
go/src/golang.org/x/sys/unix/syscall_linux.go:2256:9: undefined: unsafe.Slice
go/src/golang.org/x/sys/unix/syscall_unix.go:118:7: undefined: unsafe.Slice
go/src/golang.org/x/sys/unix/sysvshm_unix.go:33:7: undefined: unsafe.Slice

[ernstki]

Unsafe.slice was added in Go 1.17. There appears to be nothing you can do except find a way to get Go ≥ 1.17 on your system.

Update: See below.

Here are the steps I used, as a normal user, using /usr/bin/go which was version 1.13:

# temporary; you will want to add $HOME/go/bin to PATH in your login scripts
PATH=$HOME/go/bin:$PATH

# get a more recent release
GO111MODULE=on go get golang.org/dl/go1.18.9@latest

# download the full SDK
go1.18.9 download

# get pup
go1.18.9 install github.com/ericchiang/pup@latest

# make sure it worked
which pup
# result: /home/me/go/bin/pup

As a disclaimer, I am not a Go developer, and I don't claim to understand why GO111MODULE is required, why @latest seems to be required, nor why (for the second-to-last step), go get no longer works "outside a module." I just tried several things until I found something that got me a pup. I hope this can still help you, though.

References

1. https://stackoverflow.com/questions/74049351/gcloud-functions-deploy-go-runtime-error-undefined-unsafe-slice-error-id-2f5#comment130746093_74049351
2. https://go.dev/doc/manage-install
3. https://stackoverflow.com/questions/54415733/getting-gopath-error-go-cannot-use-pathversion-syntax-in-gopath-mode-in-ubun/56249926#56249926

[ernstki]

At the time, I didn't realize that there were other versions of golang in the Ubuntu 20.04 repositories. Here's an alternative, using packages already available in the repositories:

sudo apt install golang-1.18

Then, in your ~/.profile (assuming the default shell on Debian/Ubuntu):

# this is just a personal preference; the default on Unix is ~/go
export GOPATH=$HOME/.local/go
export GOROOT=/usr/lib/go-1.18
export PATH="$GOROOT/bin:$GOPATH/bin:$PATH"

Log out and back in, or . ~/.profile in your current shell session, then:

go install -v github.com/ericchiang/pup@latest

Test to make sure it worked:

$ which pup
/home/yourusername/.local/go/bin/pup

$ pup --help