Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/permissions/user.go

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package permissions
+
+import (
+	"fmt"
+	"os/user"
+	"strconv"
+)
+
+func GetUserIdUints(u *user.User) (uid, gid uint32, err error) {
+	newUID, err := strconv.ParseUint(u.Uid, 10, 32)
+	if err != nil {
+		return 0, 0, fmt.Errorf("error parsing uid '%s': %w", u.Uid, err)
+	}
+
+	newGID, err := strconv.ParseUint(u.Gid, 10, 32)
+	if err != nil {
+		return 0, 0, fmt.Errorf("error parsing gid '%s': %w", u.Gid, err)
+	}
+
+	return uint32(newUID), uint32(newGID), nil
+}
+
+func GetUserIdInts(u *user.User) (uid, gid int, err error) {
+	newUID, err := strconv.ParseInt(u.Uid, 10, strconv.IntSize)
+	if err != nil {
+		return 0, 0, fmt.Errorf("error parsing uid '%s': %w", u.Uid, err)
+	}
+
+	newGID, err := strconv.ParseInt(u.Gid, 10, strconv.IntSize)
+	if err != nil {
+		return 0, 0, fmt.Errorf("error parsing gid '%s': %w", u.Gid, err)
+	}
+
+	return int(newUID), int(newGID), nil
+}
+
+func GetUser(username string) (u *user.User, err error) {
+	u, err = user.Lookup(username)
+	if err != nil {
+		return nil, fmt.Errorf("error looking up user '%s': %w", username, err)
+	}
+
+	return u, nil
+}