x/mobile: gomobile install fails when using a vendor directory

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go1.9 linux/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

linux/amd64 (arch linux)

What did you do?

running gomobile install <package name> fails when using a vendor directory to manage deps with the following error:

gomobile: gitlab.com/stackmesh/network does not import "golang.org/x/mobile/app"

This has been tested for both the included x/mobile examples and custom projects.

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

https://play.golang.org/p/HMsmNBlfwJ
run glide init && glide update (should place a vendor dir in the project root),
run gomobile install <package name/gopath>

What did you expect to see?

The normal apk building messages and the upload logging.

What did you see instead?

gomobile: gitlab.com/stackmesh/network does not import "golang.org/x/mobile/app"

[aYosukeAkatsuka]

From https://github.com/golang/mobile/blob/master/cmd/gomobile/build.go#L137 ,

var nmRE = regexp.MustCompile(`[0-9a-f]{8} t (golang.org/x.*/[^.]*)`)

This regex is used to lookup "golang.org/x/..." package from shared object generated by gomobile using nm, but I guess it is not consider the "golang/x/..." package is placed under vendor directory.
I don't see any reason why the package cannot be placed on vendor directory. I guess this should be like this to allow put them under vendor.

var nmRE = regexp.MustCompile(`[0-9a-f]{8} t .*(golang.org/x.*/[^.]*)`)

If it is acceptable change, I'll create CL. :)
Thanks!

[eliasnaur]

That seems like a reasonable change. Please send a CL.

[eliasnaur]

Dup of: #18903

[gopherbot]

Change https://golang.org/cl/102095 mentions this issue: cmd/gomobile: allow to put "golang.org/x/..." package under vendor

[pankona]

@eliasnaur
Thank you for your comment!
I just sent a CL, please check it 💯