cmd/go: 'go tool cover' fails when import path has a '.go' suffix

[shuLhan]

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

Go 1.11rc1 and bf80e3b

Does this issue reproduce with the latest release?

If by latest release means stable release, then no.

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/ms/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/ms/go"
GOPROXY=""
GORACE=""
GOROOT="/home/ms/Programs/go"
GOTMPDIR=""
GOTOOLDIR="/home/ms/Programs/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build787046816=/tmp/go-build -gno-record-gcc-switches"

What did you do?

• Create a directory named "gotoolcover.go"
• Create source and test file, for example, main.go

package main

func printHello() {
        println("Hello")
}

and main_test.go

package main

import "testing"

func TestPrintHello(t *testing.T) {
        printHello()
}

• Run test with profile coverage,

$ go test -count=1 -coverprofile=cover.out ./...

• Convert test profile to HTML,

$ go tool cover -html=cover.out -o cover.html

What did you expect to see?

No error.

What did you see instead?

cover: cannot run go list: exit status 1
stat bug/gotoolcover.go: no such file or directory

Notes

• If I change the directory name to any text, i.e. ".any", it run successfully.

16:03 ~/tmp/sandbox/go/src/bug/gotoolcover.go
master ms 1 % cd ..

16:04 ~/tmp/sandbox/go/src/bug
master ms 0 % mv gotoolcover.go gotoolcover.any

16:04 ~/tmp/sandbox/go/src/bug
master ms 2 % cd gotoolcover.any

16:04 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 % go test -count=1 -coverprofile=cover.out ./...
ok      bug/gotoolcover.any     0.001s  coverage: 100.0% of statements

16:04 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 % go tool cover -html=cover.out -o cover.html

• This is not an issue in Go 1.10.3,

16:06 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 % go version
go version go1.10.3 linux/amd64

16:06 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 % go test -count=1 -coverprofile=cover.out ./...
ok      bug/gotoolcover.any     0.001s  coverage: 100.0% of statements

16:06 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 % go tool cover -html=cover.out -o cover.html

16:06 ~/tmp/sandbox/go/src/bug/gotoolcover.any
master ms 0 %

[iamtyler]

I ran into this as well. This has pushed me back to 1.10 for code coverage analysis.

@shuLhan FYI in your 1.10.3 example the directory suffix should be .go instead of .any to show it does work in 1.10.3. 😄

[andybons]

@rsc @bcmills

[derekcollison]

Any update in this for a fix? We renamed our NATS.io client to nats.go and are getting support issues ourselves.

[bcmills]

@derekcollison, work on this issue is unplanned (per its milestone).

[derekcollison]

Hmm well that's not good ;)

Seems like should be a one line fix in the Go tooling no?

[bcmills]

@derekcollison, if you have a one-line fix then please send it. 🙂
(https://golang.org/doc/contribute.html)

(CC @jayconrod)

[derekcollison]

I have used that line before to for https://nats.io 🙂

[agnivade]

This is fixed now:

11:29:22-agniva-/tmp/gotoolcover.go$ll
total 72
drwxr-xr-x   2 agniva agniva  4096 Oct 22 11:29 ./
drwxrwxrwt 107 root   root   57344 Oct 22 11:29 ../
-rw-r--r--   1 agniva agniva    63 Oct 22 11:21 main.go
-rw-r--r--   1 agniva agniva    92 Oct 22 11:21 main_test.go
11:29:23-agniva-/tmp/gotoolcover.go$gotip test -count=1 -coverprofile=cover.out ./...
ok  	_/tmp/gotoolcover.go	0.001s	coverage: 100.0% of statements
11:29:26-agniva-/tmp/gotoolcover.go$