Add additional notes about users and groups

client.go

@@ -18,12 +18,14 @@ import (
 	"net"
 	"os"
 	"os/exec"
+	"os/user"
 	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
+	"syscall"
 	"time"
 
 	"github.com/hashicorp/go-hclog"
@@ -507,6 +509,27 @@ func additionalNotesAboutCommand(path string) string {
 	notes += "\nAdditional notes about plugin:\n"
 	notes += fmt.Sprintf("  Path: %s\n", path)
 	notes += fmt.Sprintf("  Mode: %s\n", stat.Mode())
+	statT, ok := stat.Sys().(*syscall.Stat_t)
+	if ok {
+		currentUsername := "?"
+		if u, err := user.LookupId(strconv.FormatUint(uint64(os.Getuid()), 10)); err == nil {
+			currentUsername = u.Username
+		}
+		currentGroup := "?"
+		if g, err := user.LookupGroupId(strconv.FormatUint(uint64(os.Getgid()), 10)); err == nil {
+			currentGroup = g.Name
+		}
+		username := "?"
+		if u, err := user.LookupId(strconv.FormatUint(uint64(statT.Uid), 10)); err == nil {
+			username = u.Username
+		}
+		group := "?"
+		if g, err := user.LookupGroupId(strconv.FormatUint(uint64(statT.Gid), 10)); err == nil {
+			group = g.Name
+		}
+		notes += fmt.Sprintf("  Owner: %d [%s] (current: %d [%s])\n", statT.Uid, username, os.Getuid(), currentUsername)
+		notes += fmt.Sprintf("  Group: %d [%s] (current: %d [%s])\n", statT.Gid, group, os.Getgid(), currentGroup)
+	}
 
 	if elfFile, err := elf.Open(path); err == nil {
 		notes += fmt.Sprintf("  ELF architecture: %s (current architecture: %s)\n", elfFile.Machine, runtime.GOARCH)