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systemd/0008-util-introduce-sethostname_idempotent.patch

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Based on 605f81a8968b2df8a28cca2cf11db99ab948a2af Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Tue, 21 Oct 2014 18:17:54 +0200
Subject: [PATCH] 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.
---
src/core/hostname-setup.c | 2 +-
src/hostname/hostnamed.c | 2 +-
src/nspawn/nspawn.c | 2 +-
src/shared/util.c | 20 ++++++++++++++++++++
src/shared/util.h | 2 ++
5 files changed, 25 insertions(+), 3 deletions(-)
--- src/core/hostname-setup.c
+++ src/core/hostname-setup.c 2014-10-29 00:00:00.000000000 +0000
@@ -99,7 +99,7 @@ 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;
}
--- src/hostname/hostnamed.c
+++ src/hostname/hostnamed.c 2014-10-29 14:13:26.124337751 +0000
@@ -244,7 +244,7 @@ static int context_write_data_hostname(C
else
hn = c->data[PROP_HOSTNAME];
- if (sethostname(hn, strlen(hn)) < 0)
+ if (sethostname_idempotent(hn) < 0)
return -errno;
return 0;
--- src/nspawn/nspawn.c
+++ src/nspawn/nspawn.c 2014-10-29 00:00:00.000000000 +0000
@@ -981,7 +981,7 @@ static int setup_hostname(void) {
if (arg_share_system)
return 0;
- if (sethostname(arg_machine, strlen(arg_machine)) < 0)
+ if (sethostname_idempotent(arg_machine) < 0)
return -errno;
return 0;
--- src/shared/util.c
+++ src/shared/util.c 2014-10-29 00:00:00.000000000 +0000
@@ -6451,6 +6451,26 @@ int fd_warn_permissions(const char *path
return 0;
}
+int sethostname_idempotent(const char *s) {
+ int r;
+ char buf[HOST_NAME_MAX + 1] = {};
+
+ assert(s);
+
+ r = gethostname(buf, sizeof(buf));
+ if (r < 0)
+ return -errno;
+
+ if (streq(buf, s))
+ return 0;
+
+ r = sethostname(buf, strlen(buf));
+ if (r < 0)
+ return -errno;
+
+ return 1;
+}
+
unsigned long personality_from_string(const char *p) {
/* Parse a personality specifier. We introduce our own
--- src/shared/util.h
+++ src/shared/util.h 2014-10-29 14:14:15.764337717 +0000
@@ -899,3 +899,5 @@ union file_handle_union {
};
int umount_recursive(const char *target, int flags);
+
+int sethostname_idempotent(const char *s);