fix: use golang.org/x/sys/execabs (#224)

Closes https://github.com/ooni/probe-engine/issues/1195

cmd/ooniprobe/internal/autorun/autorun_darwin.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"os/exec"
 	"strconv"
 	"strings"
 	"text/template"
@@ -14,6 +13,7 @@ import (
 	"github.com/apex/log"
 	"github.com/ooni/probe-cli/v3/cmd/ooniprobe/internal/utils"
 	"github.com/ooni/probe-cli/v3/internal/engine/shellx"
+	"golang.org/x/sys/execabs"
 	"golang.org/x/sys/unix"
 )
 
@@ -55,7 +55,7 @@ func runQuiteQuietly(name string, arg ...string) error {
 }
 
 func darwinVersionMajor() (int, error) {
-	out, err := exec.Command("uname", "-r").Output()
+	out, err := execabs.Command("uname", "-r").Output()
 	if err != nil {
 		return 0, err
 	}
@@ -129,7 +129,7 @@ func (m managerDarwin) Start() error {
 }
 
 func (managerDarwin) stop() error {
-	var failure *exec.ExitError
+	var failure *execabs.ExitError
 	err := runQuiteQuietly("launchctl", "bootout", serviceTarget)
 	if errors.As(err, &failure) && failure.ExitCode() == int(unix.ESRCH) {
 		err = nil
@@ -158,7 +158,7 @@ func (m managerDarwin) Stop() error {
 
 func (m managerDarwin) Status() (string, error) {
 	err := runQuiteQuietly("launchctl", "kill", "SIGINFO", serviceTarget)
-	var failure *exec.ExitError
+	var failure *execabs.ExitError
 	if errors.As(err, &failure) {
 		switch failure.ExitCode() {
 		case int(unix.ESRCH):

cmd/ooniprobe/internal/utils/homedir/homedir.go

@@ -6,12 +6,13 @@ import (
 	"bytes"
 	"errors"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
 	"sync"
+
+	"golang.org/x/sys/execabs"
 )
 
 // DisableCache will disable caching of the home directory. Caching is enabled
@@ -103,7 +104,7 @@ func dirDarwin() (string, error) {
 	var stdout bytes.Buffer
 
 	// If that fails, try OS specific commands
-	cmd := exec.Command("sh", "-c", `dscl -q . -read /Users/"$(whoami)" NFSHomeDirectory | sed 's/^[^ ]*: //'`)
+	cmd := execabs.Command("sh", "-c", `dscl -q . -read /Users/"$(whoami)" NFSHomeDirectory | sed 's/^[^ ]*: //'`)
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		result := strings.TrimSpace(stdout.String())
@@ -114,7 +115,7 @@ func dirDarwin() (string, error) {
 
 	// try the shell
 	stdout.Reset()
-	cmd = exec.Command("sh", "-c", "cd && pwd")
+	cmd = execabs.Command("sh", "-c", "cd && pwd")
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		result := strings.TrimSpace(stdout.String())
@@ -125,7 +126,7 @@ func dirDarwin() (string, error) {
 
 	// try to figure out the user and check the default location
 	stdout.Reset()
-	cmd = exec.Command("whoami")
+	cmd = execabs.Command("whoami")
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		user := strings.TrimSpace(stdout.String())
@@ -150,7 +151,7 @@ func dirUnix() (string, error) {
 	var stdout bytes.Buffer
 
 	// If that fails, try OS specific commands
-	cmd := exec.Command("getent", "passwd", strconv.Itoa(os.Getuid()))
+	cmd := execabs.Command("getent", "passwd", strconv.Itoa(os.Getuid()))
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		if passwd := strings.TrimSpace(stdout.String()); passwd != "" {
@@ -164,7 +165,7 @@ func dirUnix() (string, error) {
 
 	// If all else fails, try the shell
 	stdout.Reset()
-	cmd = exec.Command("sh", "-c", "cd && pwd")
+	cmd = execabs.Command("sh", "-c", "cd && pwd")
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		result := strings.TrimSpace(stdout.String())
@@ -175,7 +176,7 @@ func dirUnix() (string, error) {
 
 	// try to figure out the user and check the default location
 	stdout.Reset()
-	cmd = exec.Command("whoami")
+	cmd = execabs.Command("whoami")
 	cmd.Stdout = &stdout
 	if err := cmd.Run(); err == nil {
 		user := strings.TrimSpace(stdout.String())

internal/cmd/e2epostprocess/main.go

@@ -7,9 +7,10 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
+
+	"golang.org/x/sys/execabs"
 )
 
 func fatalOnError(err error) {
@@ -70,7 +71,7 @@ func main() {
 				options = append(options, *entry.Input)
 			}
 			log.Printf("run: go %s", strings.Join(options, " "))
-			cmd := exec.Command("go", options...)
+			cmd := execabs.Command("go", options...)
 			cmd.Stdout, cmd.Stderr = os.Stdout, os.Stderr
 			err = cmd.Run()
 			fatalOnError(err)

internal/cmd/jafar/iptables/iptables_integration_test.go

@@ -7,12 +7,13 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
-	"os/exec"
 	"runtime"
 	"strings"
 	"testing"
 	"time"
 
+	"golang.org/x/sys/execabs"
+
 	"github.com/apex/log"
 	"github.com/ooni/probe-cli/v3/internal/cmd/jafar/resolver"
 	"github.com/ooni/probe-cli/v3/internal/cmd/jafar/uncensored"
@@ -295,7 +296,7 @@ func TestHijackHTTP(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected an error here")
 	}
-	var exitErr *exec.ExitError
+	var exitErr *execabs.ExitError
 	if !errors.As(err, &exitErr) {
 		t.Fatal("not the error type we expected")
 	}
@@ -335,7 +336,7 @@ func TestHijackHTTPS(t *testing.T) {
 		t.Fatal("expected an error here")
 	}
 	t.Log(err)
-	var exitErr *exec.ExitError
+	var exitErr *execabs.ExitError
 	if !errors.As(err, &exitErr) {
 		t.Fatal("not the error type we expected")
 	}

internal/cmd/jafar/main.go

@@ -10,11 +10,12 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"os/exec"
 	"os/signal"
 	"strings"
 	"syscall"
 
+	"golang.org/x/sys/execabs"
+
 	"github.com/apex/log"
 	"github.com/apex/log/handlers/cli"
 	"github.com/miekg/dns"
@@ -243,7 +244,7 @@ func mustx(err error, message string, osExit func(int)) {
 	if err != nil {
 		var (
 			exitcode = 1
-			exiterr  *exec.ExitError
+			exiterr  *execabs.ExitError
 		)
 		if errors.As(err, &exiterr) {
 			exitcode = exiterr.ExitCode()

internal/engine/shellx/shellx.go

@@ -4,9 +4,10 @@ package shellx
 import (
 	"errors"
 	"os"
-	"os/exec"
 	"strings"
 
+	"golang.org/x/sys/execabs"
+
 	"github.com/apex/log"
 	"github.com/google/shlex"
 	"github.com/ooni/probe-cli/v3/internal/engine/model"
@@ -22,7 +23,7 @@ type runconfig struct {
 
 func run(config runconfig) error {
 	config.loginfof("exec: %s %s", config.name, strings.Join(config.args, " "))
-	cmd := exec.Command(config.name, config.args...)
+	cmd := execabs.Command(config.name, config.args...)
 	cmd.Stdout = config.stdout
 	cmd.Stderr = config.stderr
 	err := cmd.Run()