/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2010 Lennart Poettering ***/ #include #include #include #include "alloc-util.h" #include "fileio.h" #include "hostname-setup.h" #include "hostname-util.h" #include "log.h" #include "macro.h" #include "string-util.h" #include "util.h" int hostname_setup(void) { _cleanup_free_ char *b = NULL; bool enoent = false; const char *hn; int r; r = read_etc_hostname(NULL, &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 = FALLBACK_HOSTNAME; } 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; }