Unix/linux system filepath.VolumeName(`\host\share\foo`) return "" #41201

junhaideng · 2020-09-03T02:00:16Z

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

$ go version
go version go1.14.7 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/linux/.cache/go-build"
GOENV="/home/linux/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/linux/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"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build771253865=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I ran the following code

fmt.Println(filepath.VolumeName(`\host\share\foo`))

What did you expect to see?

the result should be \host\share like the doc says

What did you see instead?

the result is ""

I have seen the source code, such as
path.go

// VolumeName returns leading volume name.
// Given "C:\foo\bar" it returns "C:" on Windows.
// Given "\\host\share\foo" it returns "\\host\share".
// On other platforms it returns "".
func VolumeName(path string) string {
	return path[:volumeNameLen(path)]
}

path_unix.go

// volumeNameLen returns length of the leading volume name on Windows.
// It returns 0 elsewhere.
func volumeNameLen(path string) int {
	return 0
}

so, in unix/linux system, volumeNameLen should be 0, and then VolumeName should be "", so is the doc wrong, or I got it wrong?
Thanks for solving my question

The text was updated successfully, but these errors were encountered:

davecheney · 2020-09-03T02:42:35Z

Doesn’t you mean \host\share?

junhaideng · 2020-09-03T02:52:07Z

Doesn’t you mean \host\share?

I am so sorry that I can not understand your words, I just can not get the right output of fmt.Println(filepath.VolumeName(\host\share\foo)) as the doc says

mattn · 2020-09-03T03:24:11Z

\host\share\foo is not an UNC paths. It should be \\host\share\foo.

networkimprov · 2020-09-03T03:28:17Z

Are you running the code on Linux or Windows? It's only effective on Windows.

junhaideng · 2020-09-03T03:41:09Z

\host\share\foo is not an UNC paths. It should be \\host\share\foo.

I have tried the following ones, but all of them are ""

Can you give me the right code, thanks a lot !

junhaideng · 2020-09-03T03:43:00Z

Are you running the code on Linux or Windows? It's only effective on Windows.

Yep, I ran it on the Linux machine with VMware WorksStation

rsc · 2020-09-03T03:54:53Z

On non-Windows systems, VolumeName always returns "".
The docs you quoted say:

// On other platforms it returns "".

That seems to be the behavior you are observing.

junhaideng · 2020-09-03T04:08:46Z

On non-Windows systems, VolumeName always returns "".
The docs you quoted say:
// On other platforms it returns "".
That seems to be the behavior you are observing.

Oh, I got it wrong by others doc, thinking that \host\share\foo is a path on unix 😢 , thank all of you for your help ❤️

junhaideng closed this as completed Sep 3, 2020

junhaideng mentioned this issue Sep 3, 2020

修改VolumeName描述错误 polaris1119/pkgdoc#15

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golang locked and limited conversation to collaborators Sep 3, 2021

gopherbot added the FrozenDueToAge label Sep 3, 2021

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Unix/linux system filepath.VolumeName(`\host\share\foo`) return "" #41201

Unix/linux system filepath.VolumeName(`\host\share\foo`) return "" #41201

junhaideng commented Sep 3, 2020 •

edited

davecheney commented Sep 3, 2020

junhaideng commented Sep 3, 2020

mattn commented Sep 3, 2020

networkimprov commented Sep 3, 2020

junhaideng commented Sep 3, 2020

junhaideng commented Sep 3, 2020

rsc commented Sep 3, 2020

junhaideng commented Sep 3, 2020 •

edited

Unix/linux system filepath.VolumeName(\host\share\foo) return "" #41201

Unix/linux system filepath.VolumeName(\host\share\foo) return "" #41201

Comments

junhaideng commented Sep 3, 2020 • edited

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

Does this issue reproduce with the latest release?

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

What did you do?

What did you expect to see?

What did you see instead?

davecheney commented Sep 3, 2020

junhaideng commented Sep 3, 2020

mattn commented Sep 3, 2020

networkimprov commented Sep 3, 2020

junhaideng commented Sep 3, 2020

junhaideng commented Sep 3, 2020

rsc commented Sep 3, 2020

junhaideng commented Sep 3, 2020 • edited

Unix/linux system filepath.VolumeName(`\host\share\foo`) return "" #41201

Unix/linux system filepath.VolumeName(`\host\share\foo`) return "" #41201

junhaideng commented Sep 3, 2020 •

edited

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

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

junhaideng commented Sep 3, 2020 •

edited