first commit

internal/user/user.go

@@ -0,0 +1,41 @@
+/*
+© 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.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package user
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// User holds information on primary and supplemental OS groups
+type User struct {
+	UID             int
+	PrimaryGID      int
+	SupplementalGID []int
+}
+
+// GetUser returns the current user and group information
+func GetUser() (User, error) {
+	u := User{
+		UID:        unix.Geteuid(),
+		PrimaryGID: unix.Getgid(),
+	}
+	groups, err := unix.Getgroups()
+	if err != nil {
+		return u, err
+	}
+	u.SupplementalGID = groups
+	return u, nil
+}