1 files changed, 68 insertions, 0 deletions
diff --git a/src/grp-system/libcore/src/hostname-setup.c b/src/grp-system/libcore/src/hostname-setup.c
new file mode 100644
index 0000000000..6170d5e030
--- /dev/null
+++ b/src/grp-system/libcore/src/hostname-setup.c
@@ -0,0 +1,68 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "core/hostname-setup.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/hostname-util.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/util.h"
+
+int hostname_setup(void) {
+        int r;
+        _cleanup_free_ char *b = NULL;
+        const char *hn;
+        bool enoent = false;
+
+        r = read_hostname_config("/etc/hostname", &b);
+        if (r < 0) {
+                if (r == -ENOENT)
+                        enoent = true;
+                else
+                        log_warning_errno(r, "Failed to read configured hostname: %m");
+
+                hn = NULL;
+        } else
+                hn = b;
+
+        if (isempty(hn)) {
+                /* Don't override the hostname if it is already set
+                 * and not explicitly configured */
+                if (hostname_is_set())
+                        return 0;
+
+                if (enoent)
+                        log_info("No hostname configured.");
+
+                hn = "localhost";
+        }
+
+        r = sethostname_idempotent(hn);
+        if (r < 0)
+                return log_warning_errno(r, "Failed to set hostname to <%s>: %m", hn);
+
+        log_info("Set hostname to <%s>.", hn);
+        return 0;
+}