sd-bus: introduce new match type "arg0has=" for matching arrays of strings

Previously, sd-bus inofficially already supported bus matches that
tested a string against an array of strings ("as"). This was done via an
enhanced way to interpret "arg0=" matches. This is problematic however,
since clients have no way to determine if their respective
implementation understood strv matches or not, thus allowing invalid
matches to be installed without a way to detect that.

This patch changes the logic to only allow such matches with a new
"arg0has=" syntax. This has the benefit that non-conforming
implementations will return a parse error and a client application may
thus efficiently detect support for the match type.

Matches of this type are useful for "udev"-like systems that "tag" objects
with a number of strings, and clients need to be able to match against
any of these "tags".

The name "has" takes inspiration from Python's ".has_key()" construct.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libsystemd/sd-bus/bus-message.h b/src/libsystemd/sd-bus/bus-message.h
index 088d5b1109..ff25003461 100644
--- a/src/libsystemd/sd-bus/bus-message.h
+++ b/src/libsystemd/sd-bus/bus-message.h
@@ -218,7 +218,8 @@ int bus_message_from_malloc(
                 const char *label,
                 sd_bus_message **ret);
 
-int bus_message_get_arg(sd_bus_message *m, unsigned i, const char **str, char ***strv);
+int bus_message_get_arg(sd_bus_message *m, unsigned i, const char **str);
+int bus_message_get_arg_strv(sd_bus_message *m, unsigned i, char ***strv);
 
 int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);