shared/sleep-config: return a custom message when not enough swap for hibernation

$ sudo swapoff -av
swapoff /dev/vda4
$ sudo systemctl hibernate
Failed to hibernate system via logind: Not enough swap space for hibernation

Fixes #6729.

1 files changed, 8 insertions, 5 deletions

diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
index 73be87b19..6bc76464c 100644
--- a/src/login/logind-dbus.c
+++ b/src/login/logind-dbus.c
@@ -1907,14 +1907,17 @@ static int method_do_shutdown_or_sleep(
         if (sleep_verb) {
 #if 0 /// Within elogind the manager m must be provided, too
                 r = can_sleep(sleep_verb);
+                if (r == -ENOSPC)
+                        return sd_bus_error_set(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
+                                                "Not enough swap space for hibernation");
+                if (r == 0)
+                        return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
+                                                 "Sleep verb \"%s\" not supported", sleep_verb);
 #else
                 r = can_sleep(m, sleep_verb);
 #endif // 0
                 if (r < 0)
                         return r;
-
-                if (r == 0)
-                        return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED, "Sleep verb not supported");
         }
 
 #if 0 /// Within elogind it does not make sense to verify shutdown creds when suspending
@@ -2401,13 +2404,13 @@ static int method_can_shutdown_or_sleep(
         if (sleep_verb) {
 #if 0 /// elogind needs to have the manager being passed
                 r = can_sleep(sleep_verb);
+                if (IN_SET(r,  0, -ENOSPC))
+                        return sd_bus_reply_method_return(message, "s", "na");
 #else
                 r = can_sleep(m, sleep_verb);
 #endif // 0
                 if (r < 0)
                         return r;
-                if (r == 0)
-                        return sd_bus_reply_method_return(message, "s", "na");
         }
 
         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);