cmd/go: vcs info not stamped when built listing .go files directly

[mlcdf]

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

$ go version
go version go1.18rc1 windows/amd64

Does this issue reproduce with the latest release?

N/A

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=C:\Users\max\AppData\Local\go-build
set GOENV=C:\Users\max\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\max\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\max\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Users\max\sdk\go1.18rc1
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Users\max\sdk\go1.18rc1\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.18rc1
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\max\Code\go-vcs-issue-repro\go.mod
set GOWORK=
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\max\AppData\Local\Temp\go-build2053103368=/tmp/go-build -gno-record-gcc-switches

What did you do?

git clone https://github.com/mlcdf/go-vcs-issue-repro.git
cd go-vcs-issue-repro
go1.18rc1 build main.go
.\main.exe

What did you expect to see?

VCS info appearing in the console :
[{-compiler gc} {CGO_ENABLED 1} {CGO_CFLAGS } {CGO_CPPFLAGS } {CGO_CXXFLAGS } {CGO_LDFLAGS } {GOARCH amd64} {GOOS windows} {GOAMD64 v1} {vcs git} {vcs.revision 2d1c081410d0f5f23fd1dd7e08794041955a2119} {vcs.time 2022-02-20T11:01:47Z} {vcs.modified false}]

What did you see instead?

[{-compiler gc} {CGO_ENABLED 1} {CGO_CFLAGS } {CGO_CPPFLAGS } {CGO_CXXFLAGS } {CGO_LDFLAGS } {GOARCH amd64} {GOOS windows} {GOAMD64 v1}]

If I run go1.18rc1 build instead of go1.18rc1 build main.go and run the .\go-vcs-issue-repro.exe binary, it works fine. Is it expected behavior?

[seankhliao]

cc @bcmills @matloob

[bcmills]

In general we stamp the VCS metadata only if the requested package is within a module in the workspace:
https://cs.opensource.google/go/go/+/master:src/cmd/go/internal/load/pkg.go;l=2362;drc=master

Since CL 339170 (CC @matloob), the fake package constructed from a list of source files is not considered to be in a module, because its source files are not in general guaranteed to be scanned by go mod tidy or go mod vendor.

Perhaps we could adjust that check to instead compare the package's directory with the directories containing the modules in the workspace.

[module17]

Not seeing the VCS metadata being populated with go 1.19.2 darwin/amd64 as well.