Merge pull request #271 from botherder/master

Obtain executable path from macOS process (fix #270)

internal/common/common.go

@@ -341,3 +341,46 @@ func WaitTimeout(c *exec.Cmd, timeout time.Duration) error {
 		return ErrTimeout
 	}
 }
+
+// https://gist.github.com/kylelemons/1525278
+func Pipeline(cmds ...*exec.Cmd) ([]byte, []byte, error) {
+        // Require at least one command
+        if len(cmds) < 1 { 
+                return nil, nil, nil
+        }
+
+        // Collect the output from the command(s)
+        var output bytes.Buffer
+        var stderr bytes.Buffer
+
+        last := len(cmds) - 1
+        for i, cmd := range cmds[:last] {
+                var err error
+                // Connect each command's stdin to the previous command's stdout
+                if cmds[i+1].Stdin, err = cmd.StdoutPipe(); err != nil {
+                        return nil, nil, err
+                }
+                // Connect each command's stderr to a buffer
+                cmd.Stderr = &stderr
+        }
+
+        // Connect the output and error for the last command
+        cmds[last].Stdout, cmds[last].Stderr = &output, &stderr
+
+        // Start each command
+        for _, cmd := range cmds {
+                if err := cmd.Start(); err != nil {
+                        return output.Bytes(), stderr.Bytes(), err
+                }
+        }
+
+        // Wait for each command to complete
+        for _, cmd := range cmds {
+                if err := cmd.Wait(); err != nil {
+                        return output.Bytes(), stderr.Bytes(), err
+                }
+        }
+
+        // Return the pipeline output and the collected standard error
+        return output.Bytes(), stderr.Bytes(), nil
+}

process/process_darwin.go

@@ -80,7 +80,34 @@ func (p *Process) Name() (string, error) {
 	return common.IntToString(k.Proc.P_comm[:]), nil
 }
 func (p *Process) Exe() (string, error) {
-	return "", common.ErrNotImplementedError
+	lsof_bin, err := exec.LookPath("lsof")
+	if err != nil {
+		return "", err
+	}
+
+	awk_bin, err := exec.LookPath("awk")
+	if err != nil {
+		return "", err
+	}
+
+	sed_bin, err := exec.LookPath("sed")
+	if err != nil {
+		return "", err
+	}
+
+	lsof := exec.Command(lsof_bin, "-p", strconv.Itoa(int(p.Pid)), "-Fn")
+	awk := exec.Command(awk_bin, "NR==3{print}")
+	sed := exec.Command(sed_bin, "s/n\\//\\//")
+
+	output, _, err := common.Pipeline(lsof, awk, sed)
+
+	if err != nil {
+		return "", err
+	}
+
+	ret := strings.TrimSpace(string(output))
+
+	return ret, nil
 }
 
 // Cmdline returns the command line arguments of the process as a string with