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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "fileio.h"
#include "hostname-setup.h"
#include "hostname-util.h"
#include "log.h"
#include "macro.h"
#include "proc-cmdline.h"
#include "string-util.h"
#include "util.h"
int hostname_setup(void) {
_cleanup_free_ char *b = NULL;
const char *hn = NULL;
bool enoent = false;
int r;
r = proc_cmdline_get_key("systemd.hostname", 0, &b);
if (r < 0)
log_warning_errno(r, "Failed to retrieve system hostname from kernel command line, ignoring: %m");
else if (r > 0) {
if (hostname_is_valid(b, true))
hn = b;
else {
log_warning("Hostname specified on kernel command line is invalid, ignoring: %s", b);
b = mfree(b);
}
}
if (!hn) {
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");
} 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;
}
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