"permission denied" errors when doing `gopherjs build` of sample program.

[dmitshur]

First of all, this looks like a really cool project and it's great to see how far you got! I tried it just got the following problem.

$ cat play_js.go 
package main

import "fmt"

func main() {
    alert("Hello, JavaScript")
    fmt.Println("Hello, playground")
}

func alert(msg string) {}

const js_alert = `window.alert(msg);`
$ gopherjs build play_js.go 
/Users/Dmitri/Desktop/play_js.go:3:8: could not import fmt (/usr/local/go/src/pkg/fmt/print.go:10:2: could not import os (/usr/local/go/src/pkg/os/dir_unix.go:11:2: could not import syscall (/usr/local/go/src/pkg/syscall/exec_bsd.go:10:2: could not import runtime (open /usr/local/go/src/pkg/runtime/zgoarch_js.go: permission denied))))
$ ls -la /usr/local/go/src/pkg/fmt/print.go
-rw-r--r--  1 root  wheel  30639 28 Nov 13:42 /usr/local/go/src/pkg/fmt/print.go

Any idea why that'd be? The files in my GOROOT are readable by user, group, others.

Running go version go1.2 darwin/amd64 on OS X 10.9.

[neelance]

Thanks for the issue report.

Please check /usr/local/go/src/pkg/runtime/zgoarch_js.go . GopherJS should create that file. Is it even existing and if yes, what are the file's permissions compared to the other files in that directory?

[dmitshur]

My /usr/local/go/ folder is read-only. That file most certainly didn't get created there.

Is it absolutely necessary for you to modify GOROOT contents rather than GOPATH? It may be, I'm just checking.

Given that's pretty non-standard, it should be mentioned in the README, under installation.

[neelance]

Yes, you are right that this is non-standard. As for the zgoarch_js.go file, I can try to find a better solution. Still, GopherJS writes packages files for core packages to their respective path, e.g. $GOROOT/pkg/$GOOS_js/...
Go itself is creating those package files on installation and does not need to change them later. Maybe I can add a fallback to also put those files into GOPATH. Do you think this is a good idea?

[neelance]

First half is done: There is no zgoarch_js.go file any more as of f9c0b26

[neelance]

And second half: 272d772
Falling back to GOPAHT now if GOROOT is not writable. Can you please check if this issue is resolved for you now?

[dmitshur]

Thanks, I will check when I get home tonight.

[dmitshur]

Confirmed, that works! 👍

I would still add a mention about the fact that it tries to make modifications within GOROOT in the readme, just so people are not caught off guard. You could say that running the gopherjs binary once with sudo installs some files for future use.

Other than that, feel free to close the issue.

[neelance]

I've added a note to the README. Thanks again for your feedback and have fun with GopherJS.