embed: go get and go.work disagree on what is included in an embed.FS

[jsteenb2]

Go version

go version go1.24.0 darwin/arm64

Output of go env in your module/workspace:

AR='ar'
CC='cc'
CXX='c++'
GCCGO='gccgo'
GO111MODULE='on'
GOARCH='arm64'
GOARM64='v8.0'
GOAUTH='netrc'
GOBIN='***'
GOCACHE='***'
GOCACHEPROG=''
GODEBUG=''
GOENV='***'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/nc/_09t16c10vl89ld5s0jkkg3h0000gn/T/go-build1473942521=/tmp/go-build -gno-record-gcc-switches -fno-common'
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='***'
GONOPROXY='***' # lists our local VCS
GONOSUMDB='***' # lists our local VCS
GOOS='darwin'
GOPATH='***'
GOPRIVATE='***' # lists our local VCS
GOPROXY='***' # lists our local VCS proxy
GOROOT='/opt/homebrew/Cellar/go/1.24.0/libexec'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOVCS=''
GOVERSION='go1.24.0'
GOWORK=''

What did you do?

When working with the //go:embed, I ran into an issue where it performed differently when working locally with go.work vs pulling the module using go get.

I have created a reproduction of the issue using a couple of modules:

• embedvendor - which houses the embed.FS desired
• getvendor - which consumes it

For context, the embedvendor is representing a server that we created for tests that acts like it is accessing a VCS server. We utilize this across other modules. There are no go files in the vendor directories.

What did you see happen?

I have the getvendor module that depends on embedvendor. Everything works as expected when working with go.work accessing it from my local development environment. However, when I use go get to pull the module, the embed.FS within embedvendor is missing entire paths that include **/vendor/** in it.

I set up a test in embedvendor/fs_test.go to validate the entire embed.FS is available. It passes as expected.

However, inside getvendor/fs_test.go, I get a failure indicating the paths with vendor/ in it are missing.

If you add the go.work into the getvendor module and wire in the embedvendor from your filesystem, the tests pass. This disagreement was jarring and took a good while to determine.

What did you expect to see?

I expected the getvendor to have access to the entire embed.FS.