x/vgo: build doesn't work

[YoshikiShibata]

Please answer these questions before submitting your issue. Thanks!

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.

1. At first, get oak
go get github.com/YoshikiShibata/oak
2. move to the directory where oak is installed.
3. Try vgo build

vgo build fails and the contents of go.mod is modified to a wrong version:

YoshikinoMacBook-Pro:oak yoshiki$ pwd
/Users/yoshiki/gocode/src/github.com/YoshikiShibata/oak
YoshikinoMacBook-Pro:oak yoshiki$ cat go.mod
module "github.com/YoshikiShibata/oak"

require "github.com/YoshikiShibata/tools" v1.0
YoshikinoMacBook-Pro:oak yoshiki$ vgo build
vgo: finding github.com/YoshikiShibata/tools v1.0.0
vgo: github.com/YoshikiShibata/tools v1.0.0: unexpected status (https://api.github.com/repos/YoshikiShibata/tools/git/refs/tags/v1.0.0): 404 Not Found
vgo: finding github.com/YoshikiShibata/tools v1.0.0
vgo: github.com/YoshikiShibata/tools v1.0.0: unexpected status (https://api.github.com/repos/YoshikiShibata/tools/git/refs/tags/v1.0.0): 404 Not Found
vgo: unexpected status (https://api.github.com/repos/YoshikiShibata/tools/git/refs/tags/v1.0.0): 404 Not Found
YoshikinoMacBook-Pro:oak yoshiki$ cat go.mod
module "github.com/YoshikiShibata/oak"

require "github.com/YoshikiShibata/tools" v1.0.0
YoshikinoMacBook-Pro:oak yoshiki$ 

4. try vgo get -u

YoshikinoMacBook-Pro:oak yoshiki$ vgo get -u
vgo: finding github.com/YoshikiShibata/tools latest
YoshikinoMacBook-Pro:oak yoshiki$ cat go.mod
module "github.com/YoshikiShibata/oak"

require "github.com/YoshikiShibata/tools" v1.0

Somehow, vgo build decides that the version of "github.com/YoshikiShibata/tools" is v1.0.0, but vgo get -u decides that the version is v1.0. Actually there is no tag of v1.0.0.

What did you expect to see?

vgo build doesn't fail.

What did you see instead?

vgo build fails.

Does this issue reproduce with the latest release (go1.10)?

System details

YoshikinoMacBook-Pro:oak yoshiki$ vgo version
go version devel +4338518da8 Thu Mar 1 00:16:20 2018 +0000 darwin/amd64 vgo:2018-02-20.1

go version devel +4338518da8 Thu Mar 1 00:16:20 2018 +0000 darwin/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/yoshiki/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/yoshiki/gocode"
GORACE=""
GOROOT="/Users/yoshiki/tools/go"
GOTMPDIR=""
GOTOOLDIR="/Users/yoshiki/tools/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/rk/f21ym6ks1ydfj0rf1kqt1ctc0000gn/T/go-build391222562=/tmp/go-build -gno-record-gcc-switches -fno-common"
VGOMODROOT=""
GOROOT/bin/go version: go version devel +4338518da8 Thu Mar 1 00:16:20 2018 +0000 darwin/amd64
GOROOT/bin/go tool compile -V: compile version devel +4338518da8 Thu Mar 1 00:16:20 2018 +0000
uname -v: Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64
ProductName:	Mac OS X
ProductVersion:	10.13.3
BuildVersion:	17D102
lldb --version: lldb-900.0.64
  Swift-4.0

[kardianos]

Two problems:

1. vgo sees v1.0 and takes it. This is issue x/vgo: confused by v1.1 tag in repo #23954
2. The tag is formatted incorrectly, it should be "v1.0.0".

Probably a duplicate.