Fixed user information logging

internal/user/user.go

@@ -1,5 +1,5 @@
 /*
-© Copyright IBM Corporation 2018, 2019
+© Copyright IBM Corporation 2018, 2020
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -16,66 +16,26 @@ limitations under the License.
 package user
 
 import (
-	"fmt"
-	"os/user"
-	"strings"
-
-	"github.com/ibm-messaging/mq-container/internal/command"
+	"golang.org/x/sys/unix"
 )
 
 // User holds information on primary and supplemental OS groups
 type User struct {
-	UID             string
-	Name            string
-	PrimaryGID      string
-	SupplementalGID []string
+	UID             int
+	PrimaryGID      int
+	SupplementalGID []int
 }
 
 // GetUser returns the current user and group information
 func GetUser() (User, error) {
-	u, err := user.Current()
+	u := User{
+		UID:        unix.Geteuid(),
+		PrimaryGID: unix.Getgid(),
+	}
+	groups, err := unix.Getgroups()
 	if err != nil {
-		return User{}, err
+		return u, err
 	}
-	g, err := getCurrentUserGroups()
-	if err != nil {
-		return User{}, err
-	}
-	if err != nil && len(g) == 0 {
-		return User{
-			UID:             u.Uid,
-			Name:            u.Name,
-			PrimaryGID:      u.Gid,
-			SupplementalGID: []string{},
-		}, nil
-	}
-	// Look for the primary group in the list of group IDs
-	for i, v := range g {
-		if v == u.Gid {
-			// Remove the element from the slice
-			g = append(g[:i], g[i+1:]...)
-		}
-	}
-	return User{
-		UID:             u.Uid,
-		Name:            u.Name,
-		PrimaryGID:      u.Gid,
-		SupplementalGID: g,
-	}, nil
-}
-
-func getCurrentUserGroups() ([]string, error) {
-	var nilArray []string
-	out, _, err := command.Run("id", "--groups")
-	if err != nil {
-		return nilArray, err
-	}
-
-	out = strings.TrimSpace(out)
-	if out == "" {
-		return nilArray, fmt.Errorf("Unable to determine groups for current user")
-	}
-
-	groups := strings.Split(out, " ")
-	return groups, nil
+	u.SupplementalGID = groups
+	return u, nil
 }

pkg/containerruntimelogger/logruntime.go

@@ -1,5 +1,5 @@
 /*
-© Copyright IBM Corporation 2017, 2019
+© Copyright IBM Corporation 2017, 2020
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -45,11 +45,14 @@ func LogContainerDetails(log *logger.Logger) error {
 		log.Printf("Base image: %v", bi)
 	}
 	u, err := user.GetUser()
+	if err != nil {
+		log.Printf("Error: %v\nUser:\n  uid: %v\n  gid: %v\n  supGid: %v", err, u.UID, u.PrimaryGID, u.SupplementalGID)
+	}
 	if err == nil {
 		if len(u.SupplementalGID) == 0 {
-			log.Printf("Running as user ID %v (%v) with primary group %v", u.UID, u.Name, u.PrimaryGID)
+			log.Printf("Running as user ID %v with primary group %v", u.UID, u.PrimaryGID)
 		} else {
-			log.Printf("Running as user ID %v (%v) with primary group %v, and supplementary groups %v", u.UID, u.Name, u.PrimaryGID, strings.Join(u.SupplementalGID, ","))
+			log.Printf("Running as user ID %v with primary group %v, and supplementary groups %v", u.UID, u.PrimaryGID, strings.Trim(strings.Join(strings.Fields(fmt.Sprint(u.SupplementalGID)), ","), "[]"))
 		}
 	}
 	caps, err := containerruntime.GetCapabilities()