Go version

go version go1.24.0 darwin/arm64

Output of go env in your module/workspace:

AR='ar'
CC='cc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='c++'
GCCGO='gccgo'
GO111MODULE=''
GOARCH='arm64'
GOARM64='v8.0'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/Users/shubham/Library/Caches/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/Users/shubham/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/6x/n9kd7_ps7wd6cd_2p44mkwsm0000gn/T/go-build2818074136=/tmp/go-build -gno-record-gcc-switches -fno-common'
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMOD='/Users/shubham/xyzabc/golang-experiments/go.mod'
GOMODCACHE='/Users/shubham/go/pkg/mod'
GONOPROXY='github.com/xxxxx/*,github.com/cshubhamrao/*'
GONOSUMDB='github.com/xxxxx/*,github.com/cshubhamrao/*'
GOOS='darwin'
GOPATH='/Users/shubham/go'
GOPRIVATE='github.com/xxxxx/*,github.com/cshubhamrao/*'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.24.0/libexec'
GOSUMDB='sum.golang.org'
GOTELEMETRY='on'
GOTELEMETRYDIR='/Users/shubham/Library/Application Support/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.24.0/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.24.0'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Original report? #50603 (comment)

• Create empty git repo,
• run go mod init github.com/cshubhamrao/golang-experiments
• create a directory subfolder; run go mod init github.com/cshubhamrao/golang-experiments/subfolder
• commit code, tag git tag subfolder/v0.0.5 and git tag v0.0.2
• Run this main.go twice, one at repo root and once inside subfolder

  (...)
  info, ok := debug.ReadBuildInfo()
  if !ok {
          fmt.Println("No build info")
          return
  }
  fmt.Println("Module:", info.Main.Path)
  fmt.Println("Version:", info.Main.Version)
  (...)

Code: https://github.com/cshubhamrao/golang-experiments/

commits and tags:

❯ git --no-pager log --pretty=oneline
090bb9c9161d4b45adfe5d4e683b869d57827c53 (HEAD -> main, tag: v0.0.2, tag: subfolder/v0.0.5, origin/main) subfolder
ef5321f41bb258c2b3a5bc93ed9f449d6f709980 (tag: v0.0.1) try not having a nested module
cc5ab004573866cc22a41d3ccf4089f1442e737c read build info
b45d30a70b2aaf45394e266d7553af70c57bc92f initial commit

What did you see happen?

• go run from repo root

  ❯ go run -buildvcs=true ./cmd
  H
  Module: github.com/cshubhamrao/golang-experiments
  Version: v0.0.2
  Sum:
  GoVersion: go1.24.0
  Dependencies:
     -buildmode exe
     -compiler gc
     CGO_ENABLED 1
     CGO_CFLAGS
     CGO_CPPFLAGS
     CGO_CXXFLAGS
     CGO_LDFLAGS
     GOARCH arm64
     GOOS darwin
     GOARM64 v8.0
     vcs git
     vcs.revision 090bb9c9161d4b45adfe5d4e683b869d57827c53
     vcs.time 2025-02-14T07:59:06Z
     vcs.modified false
• go run from subfolder

  (...)
  ❯ pushd subfolder; go run -buildvcs=true ./cmd; popd
  H
  Module: github.com/cshubhamrao/golang-experiments/subfolder
  Version: v0.0.2
  Sum:
  GoVersion: go1.24.0
  Dependencies:
     -buildmode exe
     -compiler gc
     -trimpath true
     CGO_ENABLED 1
     GOARCH arm64
     GOOS darwin
     GOARM64 v8.0
     vcs git
     vcs.revision 090bb9c9161d4b45adfe5d4e683b869d57827c53
     vcs.time 2025-02-14T07:59:06Z
     vcs.modified false
  (...)

What did you expect to see?

When run from subfolder, the module version reported should be v0.0.5 as the repo is also git-tagged as subfolder/v0.0.5