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archive/tar: Writer produces bad tar files on Windows #34839

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DeedleFake opened this issue Oct 11, 2019 · 4 comments
Closed

archive/tar: Writer produces bad tar files on Windows #34839

DeedleFake opened this issue Oct 11, 2019 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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@DeedleFake
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DeedleFake commented Oct 11, 2019 •
edited

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

$ go version
go version go1.13.1 windows/amd64

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

go env Output
$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=$HOME\AppData\Local\go-build
set GOENV=$APPDATA\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=$HOME\Devel\Go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=$HOME\scoop\apps\go\current
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=$HOME\scoop\apps\go\current\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=$TEMP\tmp.a13440\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=$TEMP\go-build061456054=/tmp/go-build -gno-record-gcc-switches

What did you do?

https://play.golang.org/p/dmkEunM6jGX

Running this on Linux or Darwin produces a tar file containing two files, Test and Other, as expected. Running this on Windows, however, produces a file which the file command identifies as data, not a tar file, and running any tar command against it results in errors. Running tar -t with the GNU tar command yields

tar: This does not look like a tar archive
tar: Skipping to next header
tar: A lone zero block at 4
tar: Exiting with failure status due to previous errors

while bsdtar, which the tar.exe that comes with Windows is a port of, yields

tar : tar.exe: Error opening archive: Unrecognized archive format
@DeedleFake DeedleFake mentioned this issue Oct 11, 2019
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@ianlancetaylor
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CC @dsnet

@mattn
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mattn commented Oct 11, 2019

I confirmed generated files on Linux/Windows are both same. The problem is that the generated tar file seems not friendly for Windows. Using tar.exe bundled in msys2/mingw

image

Using bsdtar.exe bundled in msys2/mingw

image

@smasher164 smasher164 added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Oct 11, 2019
@DeedleFake
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DeedleFake commented Oct 11, 2019 •
edited

The same GNU tar installation on the same Linux that could read the ones produced on Linux for be was unable to read the files produced on Windows.

I haven't done a binary comparison between the two. Since file reports different things for each I just assumed it was different. I'll try that when I get a chance.

@DeedleFake
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DeedleFake commented Oct 11, 2019 •
edited

It was different, but...

False alarm. Sorry about that. It looks like this is a problem with PowerShell. The | and > operators appear to be corrupting the data somehow, so go run test.go > test.tar was creating a bad tar file. It works fine in the CMD, though.

Edit: If anyone stumbles across this at some point, see https://brianreiter.org/2010/01/29/powershells-object-pipeline-corrupts-piped-binary-data/. Apparently it converts everything to UTF-16 by default instead of just piping it through. There doesn't seem to be a generic way around it, unfortunately.

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@mattn @DeedleFake @ianlancetaylor @gopherbot @smasher164