localed: skip verification when libxkbcommon is not installed

When compliled without libxkbcommon, we do no verification and accept the
arguments as given. When compliled against with, if dlopen() works, we do the
verification. But if dlopen() fails, we would refuse the call and return
SD_BUS_ERROR_INVALID_ARGS. 5de344704df64d8f31448f1222432bc87ddcfbef added things
this way when converting to dlopen(), but it seems not very useful: it can be
expected that when the library is supported but missing at runtime, we degrade
softly, and that the behaviour is something inbetween the cases of hard disable
at compilation time and full support. But right now we behave more strictly then
if disabled at compilation. Change the code to just warn if dlopen fails, but
accept the arguments.

(There are various minimization scenarios where forcing the installation of
libxkbcommon is not useful. E.g. a small installation where we want to set the
keymap via logind, but the configuration is managed by a configuration
management system and is known to be valid. Verification via libxkbcommon is
just overhead in this case.)

800f65f827c9828d4c872d44b19ca8a008505690 moved the check earlier, so now even
a noop case of setting the values that were already in place can fail.
C.f. https://bugzilla.redhat.com/show_bug.cgi?id=2175244.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/locale/localed.c b/src/locale/localed.c
index 267f27635b..0e1680d72a 100644
--- a/src/locale/localed.c
+++ b/src/locale/localed.c
@@ -614,13 +614,13 @@ static int method_set_x11_keyboard(sd_bus_message *m, void *userdata, sd_bus_err
 
         r = verify_xkb_rmlvo(in.model, in.layout, in.variant, in.options);
         if (r < 0) {
-                log_error_errno(r, "Cannot compile XKB keymap for new x11 keyboard layout ('%s' / '%s' / '%s' / '%s'): %m",
-                                strempty(in.model), strempty(in.layout), strempty(in.variant), strempty(in.options));
+                log_full_errno(r == -EOPNOTSUPP ? LOG_NOTICE : LOG_ERR, r,
+                               "Cannot compile XKB keymap for new x11 keyboard layout ('%s' / '%s' / '%s' / '%s'): %m",
+                               strempty(in.model), strempty(in.layout), strempty(in.variant), strempty(in.options));
 
-                if (r == -EOPNOTSUPP)
-                        return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Local keyboard configuration not supported on this system.");
-
-                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Specified keymap cannot be compiled, refusing as invalid.");
+                if (r != -EOPNOTSUPP)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
+                                                 "Specified keymap cannot be compiled, refusing as invalid.");
         }
 
         r = vconsole_read_data(c, m);