util: introduce sethostname_idempotent

Function queries system hostname and applies changes only when necessary. Also,
migrate all client of sethostname to sethostname_idempotent while at it.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/hostname-setup.c b/src/core/hostname-setup.c
index 8aa1cff1d..57baa7927 100644
--- a/src/core/hostname-setup.c
+++ b/src/core/hostname-setup.c
@@ -82,7 +82,7 @@ int hostname_setup(void) {
                 hn = "localhost";
         }
 
-        if (sethostname(hn, strlen(hn)) < 0) {
+        if (sethostname_idempotent(hn) < 0) {
                 log_warning("Failed to set hostname to <%s>: %m", hn);
                 return -errno;
         }