systemd,systemctl: export condition status and show failing condition

$ systemctl --user status hoohoo
hoohoo.service
   Loaded: loaded (/home/zbyszek/.config/systemd/user/hoohoo.service; static)
   Active: inactive (dead)
           start condition failed at Tue 2013-06-25 18:08:42 EDT; 1s ago
           ConditionPathExists=/tmp/hoo was not met

Full information is exported over D-Bus:
  [(condition, trigger, negate, param, state),...]
where state is one of "failed" (<0), "untested" (0), "OK" (>0).
I've decided to use 0 for "untested", because it might be useful to
differentiate different types of failure later on, without breaking
compatibility.

systemctl shows the failing condition, if there was a non-trigger
failing condition, or says "none of the trigger conditions were met",
because there're often many trigger conditions, and they must all
fail for the condition to fail, so printing them all would consume
a lot of space, and bring unnecessary attention to something that is
quite low-level.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/core/condition.h b/src/core/condition.h
index 2ad77876e4..1813b735a5 100644
--- a/src/core/condition.h
+++ b/src/core/condition.h
@@ -48,11 +48,14 @@ typedef enum ConditionType {
 
 typedef struct Condition {
         ConditionType type;
-        char *parameter;
 
         bool trigger:1;
         bool negate:1;
 
+        char *parameter;
+
+        int state;
+
         LIST_FIELDS(struct Condition, conditions);
 } Condition;
 
@@ -60,7 +63,6 @@ Condition* condition_new(ConditionType type, const char *parameter, bool trigger
 void condition_free(Condition *c);
 void condition_free_list(Condition *c);
 
-bool condition_test(Condition *c);
 bool condition_test_list(const char *unit, Condition *c);
 
 void condition_dump(Condition *c, FILE *f, const char *prefix);