core: fix support for transient resource limit properties

Make sure we can properly process resource limit properties. Specifically, allow transient configuration of both the
soft and hard limit, the same way from the unit files. Previously, only the the hard rlimits could be configured but
they'd implicitly spill into the soft hard rlimits.

This also updates the client-side code to be able to parse hard/soft resource limit specifications. Since we need to
serialize two properties in bus_append_unit_property_assignment() now, the marshalling of the container around it is
now moved into the function itself. This has the benefit of shortening the calling code.

As a side effect this now beefs up the rlimit parser of "systemctl set-property" to understand time and disk sizes
where that's appropriate.

1 files changed, 38 insertions, 29 deletions

diff --git a/src/shared/bus-util.c b/src/shared/bus-util.c
index 76356a6e31..9bd7db9aaa 100644
--- a/src/shared/bus-util.c
+++ b/src/shared/bus-util.c
@@ -1398,7 +1398,7 @@ int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
 
 int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) {
         const char *eq, *field;
-        int r;
+        int r, rl;
 
         assert(m);
         assert(assignment);
@@ -1409,6 +1409,10 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                 return -EINVAL;
         }
 
+        r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
+        if (r < 0)
+                return bus_log_create_error(r);
+
         field = strndupa(assignment, eq - assignment);
         eq ++;
 
@@ -1430,20 +1434,14 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                         return -EINVAL;
                 }
 
-                if (r < 0)
-                        return bus_log_create_error(r);
-
-                return 0;
+                goto finish;
 
         } else if (streq(field, "EnvironmentFile")) {
 
                 r = sd_bus_message_append(m, "sv", "EnvironmentFiles", "a(sb)", 1,
                                           eq[0] == '-' ? eq + 1 : eq,
                                           eq[0] == '-');
-                if (r < 0)
-                        return bus_log_create_error(r);
-
-                return 0;
+                goto finish;
 
         } else if (STR_IN_SET(field, "AccuracySec", "RandomizedDelaySec")) {
                 char *n;
@@ -1461,17 +1459,38 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                 /* Change suffix Sec → USec */
                 strcpy(mempcpy(n, field, l - 3), "USec");
                 r = sd_bus_message_append(m, "sv", n, "t", t);
-                if (r < 0)
-                        return bus_log_create_error(r);
-
-                return 0;
+                goto finish;
         }
 
         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
         if (r < 0)
                 return bus_log_create_error(r);
 
-        if (STR_IN_SET(field,
+        rl = rlimit_from_string(field);
+        if (rl >= 0) {
+                const char *sn;
+                struct rlimit l;
+
+                r = rlimit_parse(rl, eq, &l);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse resource limit: %s", eq);
+
+                r = sd_bus_message_append(m, "v", "t", l.rlim_max);
+                if (r < 0)
+                        return bus_log_create_error(r);
+
+                r = sd_bus_message_close_container(m);
+                if (r < 0)
+                        return bus_log_create_error(r);
+
+                r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
+                if (r < 0)
+                        return bus_log_create_error(r);
+
+                sn = strjoina(field, "Soft");
+                r = sd_bus_message_append(m, "sv", sn, "t", l.rlim_cur);
+
+        } else if (STR_IN_SET(field,
                        "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting",
                        "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies",
                        "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit",
@@ -1652,21 +1671,6 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                         r = sd_bus_message_append(m, "v", "a(st)", path, u);
                 }
 
-        } else if (rlimit_from_string(field) >= 0) {
-                uint64_t rl;
-
-                if (streq(eq, "infinity"))
-                        rl = (uint64_t) -1;
-                else {
-                        r = safe_atou64(eq, &rl);
-                        if (r < 0) {
-                                log_error("Invalid resource limit: %s", eq);
-                                return -EINVAL;
-                        }
-                }
-
-                r = sd_bus_message_append(m, "v", "t", rl);
-
         } else if (streq(field, "Nice")) {
                 int32_t i;
 
@@ -1849,6 +1853,11 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                 return -EINVAL;
         }
 
+finish:
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_close_container(m);
         if (r < 0)
                 return bus_log_create_error(r);