go: cmd/go: build inside a Windows container does not find the sources in mounted volume

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

go version go1.8beta2 windows/amd64

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

set GOARCH=amd64
set GOBIN=
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\gopath
set GORACE=
set GOROOT=c:\go
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
set CXX=g++
set CGO_ENABLED=1
set PKG_CONFIG=pkg-config
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2

What did you do?

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

I tried to compile Go sources inside a Windows container by mounting the sources from the Windows Docker host into the Windows container.

On the Windows Docker host I did:

mkdir test
cd test
notepad webserver.go
docker run -it -v "$(pwd):C:\code" golang:1.8-nanoserver powershell

Now inside the PowerShell session in the Windows container I did:

cd c:\code
go build webserver.go

What did you expect to see?

It should find the Go source in the folder C:\code and build it.

I know there is https://github.com/golang/go/issues/15978 with the fix https://github.com/golang/go/commit/e65bce7144dbced232df8842ef6825d7e45f094e in Go 1.8. That’s why I tried it with the latest version.

What did you see instead?

PS C:\code> go build webserver.go
go build command-line-arguments: c:\go\pkg\tool\windows_amd64\compile.exe: chdir \ContainerMappedDirectories\F12A85AF-6803-4A43-A97B-BAFA93BDC334: The system cannot find the path specified.

Some more details about the mounted volume / reparse point C:\code in the container:

PS C:\> cmd /c dir
 Volume in drive C has no label.
 Volume Serial Number is 1A3C-1F59

 Directory of C:\

01/07/2017  01:35 AM    <SYMLINKD>     code [\\?\ContainerMappedDirectories\F12A85AF-6803-4A43-A97B-BAFA93BDC334]
01/07/2017  01:36 AM    <DIR>          go
01/07/2017  01:35 AM    <DIR>          gopath
11/20/2016  03:32 AM             1,894 License.txt
01/07/2017  01:35 AM    <DIR>          Program Files
07/16/2016  04:09 AM    <DIR>          Program Files (x86)
01/07/2017  01:35 AM    <DIR>          Users
01/07/2017  01:41 AM    <DIR>          Windows
               1 File(s)          1,894 bytes
               7 Dir(s)  21,231,828,992 bytes free
PS C:\> fsutil reparsepoint query c:\code
Reparse Tag Value : 0xa000000c
Tag value: Microsoft
Tag value: Name Surrogate
Tag value: Symbolic Link

Reparse Data Length: 0x00000116
Reparse Data:
0000:  00 00 80 00 82 00 86 00  00 00 00 00 5c 00 43 00  ............\.C.
0010:  6f 00 6e 00 74 00 61 00  69 00 6e 00 65 00 72 00  o.n.t.a.i.n.e.r.
0020:  4d 00 61 00 70 00 70 00  65 00 64 00 44 00 69 00  M.a.p.p.e.d.D.i.
0030:  72 00 65 00 63 00 74 00  6f 00 72 00 69 00 65 00  r.e.c.t.o.r.i.e.
0040:  73 00 5c 00 46 00 31 00  32 00 41 00 38 00 35 00  s.\.F.1.2.A.8.5.
0050:  41 00 46 00 2d 00 36 00  38 00 30 00 33 00 2d 00  A.F.-.6.8.0.3.-.
0060:  34 00 41 00 34 00 33 00  2d 00 41 00 39 00 37 00  4.A.4.3.-.A.9.7.
0070:  42 00 2d 00 42 00 41 00  46 00 41 00 39 00 33 00  B.-.B.A.F.A.9.3.
0080:  42 00 44 00 43 00 33 00  33 00 34 00 00 00 5c 00  B.D.C.3.3.4...\.
0090:  5c 00 3f 00 5c 00 43 00  6f 00 6e 00 74 00 61 00  \.?.\.C.o.n.t.a.
00a0:  69 00 6e 00 65 00 72 00  4d 00 61 00 70 00 70 00  i.n.e.r.M.a.p.p.
00b0:  65 00 64 00 44 00 69 00  72 00 65 00 63 00 74 00  e.d.D.i.r.e.c.t.
00c0:  6f 00 72 00 69 00 65 00  73 00 5c 00 46 00 31 00  o.r.i.e.s.\.F.1.
00d0:  32 00 41 00 38 00 35 00  41 00 46 00 2d 00 36 00  2.A.8.5.A.F.-.6.
00e0:  38 00 30 00 33 00 2d 00  34 00 41 00 34 00 33 00  8.0.3.-.4.A.4.3.
00f0:  2d 00 41 00 39 00 37 00  42 00 2d 00 42 00 41 00  -.A.9.7.B.-.B.A.
0100:  46 00 41 00 39 00 33 00  42 00 44 00 43 00 33 00  F.A.9.3.B.D.C.3.
0110:  33 00 34 00 00 00                                 3.4...
PS C:\>