Get file owners (uid/gid)

[W944]

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

-bash-4.1# go version
go version go1.5.1 linux/amd64

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

-bash-4.1# go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH=""
GORACE=""
GOROOT="/usr/lib/golang"
GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_amd64"
GO15VENDOREXPERIMENT=""
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
CXX="g++"
CGO_ENABLED="1"

1. What did you do?

I can not find a way to read the owner uid/gid of a file.
Looking a the OS functions, I see chmod and chown, but there is no corresponding functions to actually see the current values.
https://golang.org/pkg/os/

1. What did you expect to see?

A way to read the uid/gid owener of a file.

1. What did you see instead?

Such a function is not present.

[bradfitz]

Let's move this to https://golang.org/wiki/Questions

[techtonik]

So where is the answer there? (I don't see any search for wiki)

[bradfitz]

The page explains where to ask questions. It doesn't contain the answer to your question itself.

The answer is os.Stat's FileInfo.Sys.

[techtonik]

os.File.Stat FileInfo.Sys and it is not cross-platform.

[minux]

(Numerical) Uid and Gid are not portable across all systems supported by Go anyway.

[techtonik]

Not portable even between two remote Linux systems. Or if filesystem doesn't support them. What is the return value of gid, uid if filesystem doesn't support them? Documentation doesn't mention that (or hides it too deep).

[minux]

not all systems use numerical uid/gids.

[techtonik]

How to detect what kind of uid/gid is used by the system (and filesystem FWIW)?

[minux]

Please ask questions on other mediums, see https://golang.org/wiki/Questions .