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cmd/nm: use the test binary as 'nm' instead of rebuilding it

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This not only reduces the latency of the test, but also respects
build flags like '-race' and '-cover' passed to the 'go test' command.

Change-Id: Iffdc60d444a9ff1d4ff5e688bca1c2ef0dfa03c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/450703
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Bryan C. Mills 2022-11-15 10:30:10 -05:00 committed by Gopher Robot
parent 0b82b670ed
commit 5e73f6a029
1 changed files with 32 additions and 36 deletions
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62
src/cmd/nm/nm_test.go
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@ -5,52 +5,48 @@
package main
import (
"fmt"
"internal/obscuretestdata"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"sync"
"testing"
"text/template"
)
var testnmpath string // path to nm command created for testing purposes
// The TestMain function creates a nm command for testing purposes and
// deletes it after the tests have been run.
// TestMain executes the test binary as the nm command if
// GO_NMTEST_IS_NM is set, and runs the tests otherwise.
func TestMain(m *testing.M) {
os.Exit(testMain(m))
if os.Getenv("GO_NMTEST_IS_NM") != "" {
main()
os.Exit(0)
}
func testMain(m *testing.M) int {
if !testenv.HasGoBuild() {
return 0
os.Setenv("GO_NMTEST_IS_NM", "1") // Set for subprocesses to inherit.
os.Exit(m.Run())
}
tmpDir, err := os.MkdirTemp("", "TestNM")
if err != nil {
fmt.Println("TempDir failed:", err)
return 2
}
defer os.RemoveAll(tmpDir)
// nmPath returns the path to the "nm" binary to run.
func nmPath(t testing.TB) string {
t.Helper()
testenv.MustHaveExec(t)
testnmpath = filepath.Join(tmpDir, "testnm.exe")
gotool, err := testenv.GoTool()
if err != nil {
fmt.Println("GoTool failed:", err)
return 2
nmPathOnce.Do(func() {
nmExePath, nmPathErr = os.Executable()
})
if nmPathErr != nil {
t.Fatal(nmPathErr)
}
out, err := exec.Command(gotool, "build", "-o", testnmpath, "cmd/nm").CombinedOutput()
if err != nil {
fmt.Printf("go build -o %v cmd/nm: %v\n%s", testnmpath, err, string(out))
return 2
return nmExePath
}
return m.Run()
}
var (
nmPathOnce sync.Once
nmExePath string
nmPathErr error
)
func TestNonGoExecs(t *testing.T) {
t.Parallel()
@ -77,7 +73,7 @@ func TestNonGoExecs(t *testing.T) {
exepath = tf
}
cmd := exec.Command(testnmpath, exepath)
cmd := testenv.Command(t, nmPath(t), exepath)
out, err := cmd.CombinedOutput()
if err != nil {
t.Errorf("go tool nm %v: %v\n%s", exepath, err, string(out))
@ -116,12 +112,12 @@ func testGoExec(t *testing.T, iscgo, isexternallinker bool) {
args = append(args, "-ldflags", "-linkmode="+linkmode)
}
args = append(args, src)
out, err := exec.Command(testenv.GoToolPath(t), args...).CombinedOutput()
out, err := testenv.Command(t, testenv.GoToolPath(t), args...).CombinedOutput()
if err != nil {
t.Fatalf("building test executable failed: %s %s", err, out)
}
out, err = exec.Command(exe).CombinedOutput()
out, err = testenv.Command(t, exe).CombinedOutput()
if err != nil {
t.Fatalf("running test executable failed: %s %s", err, out)
}
@ -151,7 +147,7 @@ func testGoExec(t *testing.T, iscgo, isexternallinker bool) {
runtimeSyms["runtime.epclntab"] = "D"
}
out, err = exec.Command(testnmpath, exe).CombinedOutput()
out, err = testenv.Command(t, nmPath(t), exe).CombinedOutput()
if err != nil {
t.Fatalf("go tool nm: %v\n%s", err, string(out))
}
@ -250,7 +246,7 @@ func testGoLib(t *testing.T, iscgo bool) {
t.Fatal(err)
}
cmd := exec.Command(testenv.GoToolPath(t), "build", "-buildmode=archive", "-o", "mylib.a", ".")
cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-buildmode=archive", "-o", "mylib.a", ".")
cmd.Dir = libpath
cmd.Env = append(os.Environ(), "GOPATH="+gopath)
out, err := cmd.CombinedOutput()
@ -259,7 +255,7 @@ func testGoLib(t *testing.T, iscgo bool) {
}
mylib := filepath.Join(libpath, "mylib.a")
out, err = exec.Command(testnmpath, mylib).CombinedOutput()
out, err = testenv.Command(t, nmPath(t), mylib).CombinedOutput()
if err != nil {
t.Fatalf("go tool nm: %v\n%s", err, string(out))
}