x/mobile: Error running gomobile init Go 1.17

[morningsend]

After recent changes with the way Go modules works in Go 1.16 and Go 1.17, we are seeing issues with gomobile.

$ go install golang.org/x/mobile/cmd/gomobile@latest
$ gomobile init
gomobile: go install golang.org/x/mobile/cmd/gobind failed: exit status 1
go install: version is required when current directory is not in a module
        Try 'go install golang.org/x/mobile/cmd/gobind@latest' to install the latest version

The line codde that related to this issue is:
https://github.com/golang/mobile/blob/master/cmd/gomobile/init.go#L81

i.e., installing a command now requires a version such as

go install golang.org/x/mobile/cmd/gobind@latest

If we try running gomobile init from a go module we also get an error:

$ mkdir -p /tmp/mobile_test
$ cd /tmp/mobile_test
$ go mod init mobile_test
$ go install golang.org/x/mobile/cmd/gomobile@latest
$ gomobile init
gomobile: go install golang.org/x/mobile/cmd/gobind failed: exit status 1
no required module provides package golang.org/x/mobile/cmd/gobind; to add it:
        go get golang.org/x/mobile/cmd/gobind

Go version:

$ go version
go version go1.17.6 linux/amd64

Go env:

# go env
GO111MODULE=""
GOARCH="amd64"
GOBIN="/go/bin"
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.6"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/tmp/mobile_test/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3067796960=/tmp/go-build -gno-record-gcc-switches"

[kordax]

Same issue here:
go version go1.17.6 linux/amd64
go install -v golang.org/x/mobile/cmd/gomobile@latest does nothing:
$ grep gomobile go.mod | wc -c 0

[zhangqibo]

I got the same problem.
go version go1.17.6 windows/amd64

[changkun]

As suggested, go get golang.org/x/mobile/cmd/gobind can solve the issue.

[morningsend]

As suggested, go get golang.org/x/mobile/cmd/gobind can solve the issue.

@changkun Do you suggest we create a dummy go module and run go get? Otherwise go prints the following warning:

$ go get golang.org/x/mobile/cmd/gobind
go: downloading golang.org/x/mobile v0.0.0-20220112015953-858099ff7816
go: downloading golang.org/x/tools v0.1.8-0.20211022200916-316ba0b74098
go get: installing executables with 'go get' in module mode is deprecated.
	Use 'go install pkg@version' instead.
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.

[changkun]

I think so. As far as I understood the issue, you are executing and running go install inside a go module. After my attempt to reproduce the issue, when receiving this error:

$ gomobile init
gomobile: go install golang.org/x/mobile/cmd/gobind failed: exit status 1
no required module provides package golang.org/x/mobile/cmd/gobind; to add it:
        go get golang.org/x/mobile/cmd/gobind

We can simply follow the suggestion go get golang.org/x/mobile/cmd/gobind to get rid of the error. Then gomobile init works smoothly.

[kordax]

I think so. As far as I understood the issue, you are executing and running go install inside a go module. After my attempt to reproduce the issue, when receiving this error:

$ gomobile init
gomobile: go install golang.org/x/mobile/cmd/gobind failed: exit status 1
no required module provides package golang.org/x/mobile/cmd/gobind; to add it:
        go get golang.org/x/mobile/cmd/gobind

We can simply follow the suggestion go get golang.org/x/mobile/cmd/gobind to get rid of the error. Then gomobile init works smoothly.

It won't work with vendoring.

$ gomobile init
gomobile: go install golang.org/x/mobile/cmd/gobind failed: exit status 1
cannot find package "." in:
/home/kordax/Projects/maxbet/ebiten-client/vendor/golang.org/x/mobile/cmd/gobind

[kordax]

Well, vendor mode is probably a different issue, without vendor mode "go get golang.org/x/mobile/cmd/gobind" works fine.

[changkun]

@kordax You are right that vendor mode is a different issue. If your vendor folder does not contain golang.org/x/mobile/cmd/gobind, then it certainly cannot find such a package and throw an error.

[kordax]

@changkun well, the vendor folder does not contain Gobind because it doesn't work properly with go mod vendor and is not explicitly mentioned I guess.

[morningsend]

Would this snippet fix the issue?

@@ -78,7 +78,7 @@ func runInit(cmd *command) error {
        }()
 
        // Make sure gobind is up to date.
-       if err := goInstall([]string{"golang.org/x/mobile/cmd/gobind"}, nil); err != nil {
+       if err := goInstall([]string{"golang.org/x/mobile/cmd/gobind@latest"}, nil); err != nil {
                return err
        }
 

[changkun]

I think so. Feel free to send a CL for that :)

[morningsend]

I think so. Feel free to send a CL for that :)

Thanks, will do so

[gopherbot]

Change https://go.dev/cl/384414 mentions this issue: cmd/gomobile: add missing latest tag to gobind