Get file owner/group

[Torrance Hodgson]

Hi all, I must be missing something simple here! :)

How do I find the owner and group of a file? Either as a integer or name?

I can see all sorts of methods in package os that allow me to set both the owner and group, but not to read it. Is it buried somewhere in os.FileInfo or os.FileMode and I'm simply missing it?

And as an aside, is there a nice way to translate a user or group name to its integer value?

Thanks!
Torrance

[Caleb Spare]

On Wed, Feb 19, 2014 at 3:47 PM, Torrance Hodgson <torra...@gmail.com> wrote:

Hi all, I must be missing something simple here! :)

How do I find the owner and group of a file? Either as a integer or name?

I can see all sorts of methods in package os that allow me to set both the owner and group, but not to read it. Is it buried somewhere in os.FileInfo

yes: https://groups.google.com/forum/#!topic/golang-nuts/ywS7xQYJkHY

 

or os.FileMode and I'm simply missing it?

And as an aside, is there a nice way to translate a user or group name to its integer value?

Thanks!
Torrance

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[Torrance Hodgson]

On 20/02/2014, at 12:53 pm, Caleb Spare <ces...@gmail.com> wrote:

yes: https://groups.google.com/forum/#!topic/golang-nuts/ywS7xQYJkHY

Thanks, i saw that reply earlier but thought there must be a cross-platform way to do it.

Why can we change file ownership/group safely across platforms, but not read ownership/group information?

[Michael Hofmann]

On Thursday, February 20, 2014 1:01:08 AM UTC+1, Torrance Hodgson wrote:

Why can we change file ownership/group safely across platforms [...]

You can't, actually. os.Chown doesn't work on Windows (and neither on Plan9 I believe).

Which leads to the question why this function is part of package os. Shouldn't it rather be in syscall? 

[Gyepi SAM]

chown is part of the posix standard.

I know some Windows versions were posix compliant, but I don't know about
more recent versions; I stopped at NT and 2K, which were.

You're right about Plan9.

-Gyepi

[Michael Hofmann]

On Saturday, February 22, 2014 8:22:07 AM UTC+1, Gyepi SAM wrote:

chown is part of the posix standard.

I know some Windows versions were posix compliant, but I don't know about
more recent versions; I stopped at NT and 2K, which were.

Anyway, package os is meant to be platform independent and thus shouldn't depend on POSIX functionality. To quote the package documentation:

"The os interface is intended to be uniform across all operating systems. Features not generally available appear in the system-specific package syscall."

Chmod isn't generally available and neither are Getuid and friends and maybe some other functions that I've overlooked. I know this isn't terribly important and couldn't be changed before Go 2.0 anyway. I think it's just important to know that package os is not as platform independent as it's documentation suggests.