sd_login: Write notes on cgroup structure; realize how to simplify the code.

I'm not sure that the most appropriate error is returned in all cases.

1 files changed, 10 insertions, 8 deletions

diff --git a/sd_login/util_valid.go b/sd_login/util_valid.go
index 46493b3..1837a8f 100644
--- a/sd_login/util_valid.go
+++ b/sd_login/util_valid.go
@@ -15,21 +15,23 @@
 package sd_login
 
 import (
+	"strconv"
 	"strings"
 )
 
-func valid_session_name(id string) bool {
-	if id == "" {
-		return false
-	}
-
-	return strings.TrimLeft(id, letters+digits) == ""
-}
-
 func valid_slice_name(s string) bool {
 	return strings.HasSuffix(s, ".slice") && valid_unit_name(s) == unit_name_plain
 }
 
+func valid_user_tree(unit string) bool {
+	sessStr, sessOk := trimPrefixSuffix(unit, "session-", ".scope")
+
+	ownerStr, ownerOk := trimPrefixSuffix(unit, "user@", ".service")
+	_, ownerErr := strconv.Atoi(ownerStr)
+
+	return (sessOk && (SessionName(sessStr).isValid())) || (ownerOk && ownerErr == nil)
+}
+
 func valid_filename(s string) bool {
 	switch s {
 	case "", ".", "..":