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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
302e8c4c | 2 | |
302e8c4c | 3 | #include <errno.h> |
07630cea | 4 | #include <stdio.h> |
302e8c4c LP |
5 | #include <stdlib.h> |
6 | ||
b5efdb8a | 7 | #include "alloc-util.h" |
a5c32cff | 8 | #include "fileio.h" |
cf0fbc49 | 9 | #include "hostname-setup.h" |
958b66ea | 10 | #include "hostname-util.h" |
07630cea LP |
11 | #include "log.h" |
12 | #include "macro.h" | |
34293dfa | 13 | #include "proc-cmdline.h" |
07630cea LP |
14 | #include "string-util.h" |
15 | #include "util.h" | |
302e8c4c | 16 | |
302e8c4c | 17 | int hostname_setup(void) { |
46a2911b | 18 | _cleanup_free_ char *b = NULL; |
34293dfa | 19 | const char *hn = NULL; |
fb3d2b8f | 20 | bool enoent = false; |
8341d4fa | 21 | int r; |
302e8c4c | 22 | |
34293dfa LP |
23 | r = proc_cmdline_get_key("systemd.hostname", 0, &b); |
24 | if (r < 0) | |
25 | log_warning_errno(r, "Failed to retrieve system hostname from kernel command line, ignoring: %m"); | |
26 | else if (r > 0) { | |
27 | if (hostname_is_valid(b, true)) | |
28 | hn = b; | |
29 | else { | |
30 | log_warning("Hostname specified on kernel command line is invalid, ignoring: %s", b); | |
31 | b = mfree(b); | |
32 | } | |
33 | } | |
46a2911b | 34 | |
34293dfa LP |
35 | if (!hn) { |
36 | r = read_etc_hostname(NULL, &b); | |
37 | if (r < 0) { | |
38 | if (r == -ENOENT) | |
39 | enoent = true; | |
40 | else | |
41 | log_warning_errno(r, "Failed to read configured hostname: %m"); | |
42 | } else | |
43 | hn = b; | |
44 | } | |
302e8c4c | 45 | |
344de609 | 46 | if (isempty(hn)) { |
34293dfa | 47 | /* Don't override the hostname if it is already set and not explicitly configured */ |
344de609 | 48 | if (hostname_is_set()) |
46a2911b | 49 | return 0; |
9bec0b1e | 50 | |
fb3d2b8f LP |
51 | if (enoent) |
52 | log_info("No hostname configured."); | |
53 | ||
8341d4fa | 54 | hn = FALLBACK_HOSTNAME; |
9bec0b1e LP |
55 | } |
56 | ||
709f6e46 MS |
57 | r = sethostname_idempotent(hn); |
58 | if (r < 0) | |
59 | return log_warning_errno(r, "Failed to set hostname to <%s>: %m", hn); | |
302e8c4c | 60 | |
46a2911b LP |
61 | log_info("Set hostname to <%s>.", hn); |
62 | return 0; | |
302e8c4c | 63 | } |