ttyの `/ etc / issue`の前の改行を削除します
ttyのログインプロンプトで/etc/issueのコンテンツの前に挿入されたデフォルトの改行を削除したいと思います。 agettyとsystemdを使用しています。
--nonewlineオプションを[email protected]に追加しようとしました：
ExecStart=/sbin/agetty --nonewline --noclear %I $TERM
その結果：
# systemctl status -l [email protected]
● [email protected] - Getty on tty5
Loaded: loaded (/usr/lib/systemd/system/[email protected]; disabled)
Active: failed (Result: start-limit) since sam. 2014-05-17 23:50:13 CEST; 56s ago
Docs: man:agetty(8)
man:systemd-getty-generator(8)
http://0pointer.de/blog/projects/serial-console.html
Process: 14538 ExecStart=/sbin/agetty --nonewline --noclear %I $TERM (code=exited, status=1/FAILURE)
Main PID: 14538 (code=exited, status=1/FAILURE)
systemd[1]: [email protected] has no holdoff time, scheduling restart.
systemd[1]: Stopping Getty on tty5...
systemd[1]: Starting Getty on tty5...
systemd[1]: [email protected] start request repeated too quickly, refusing to start.
systemd[1]: Failed to start Getty on tty5.
systemd[1]: Unit [email protected] entered failed state.
そして私は得る：
# journalctl --no-pager -b -u [email protected]
-- Logs begin at sam. 2013-10-12 00:20:12 CEST, end at sam. 2014-05-17 23:52:49 CEST. --
systemd[1]: Starting Getty on tty5...
systemd[1]: Started Getty on tty5.
agetty[14497]: Usage:
agetty[14497]: agetty [options] <line> [<baud_rate>,...] [<termtype>]
agetty[14497]: agetty [options] <baud_rate>,... <line> [<termtype>]
agetty[14497]: Options:
agetty[14497]: -8, --8bits assume 8-bit tty
agetty[14497]: -a, --autologin <user> login the specified user automatically
agetty[14497]: -c, --noreset do not reset control mode
agetty[14497]: -E, --remote use -r <hostname> for login(1)
agetty[14497]: -f, --issue-file <file> display issue file
agetty[14497]: -h, --flow-control enable hardware flow control
agetty[14497]: -H, --Host <hostname> specify login Host
agetty[14497]: -i, --noissue do not display issue file
agetty[14497]: -I, --init-string <string> set init string
agetty[14497]: -l, --login-program <file> specify login program
agetty[14497]: -L, --local-line[=<mode>] control the local line flag
agetty[14497]: -m, --extract-baud extract baud rate during connect
agetty[14497]: -n, --skip-login do not Prompt for login
agetty[14497]: -o, --login-options <opts> options that are passed to login
agetty[14497]: -p, --login-pause wait for any key before the login
agetty[14497]: -r, --chroot <dir> change root to the directory
agetty[14497]: -R, --hangup do virtually hangup on the tty
agetty[14497]: -s, --keep-baud try to keep baud rate after break
agetty[14497]: -t, --timeout <number> login process timeout
agetty[14497]: -U, --detect-case detect uppercase terminal
agetty[14497]: -w, --wait-cr wait carriage-return
agetty[14497]: --noclear do not clear the screen before Prompt
agetty[14497]: --nohints do not print hints
agetty[14497]: --nonewline do not print a newline before issue
agetty[14497]: --nohostname no hostname at all will be shown
agetty[14497]: --long-hostname show full qualified hostname
agetty[14497]: --erase-chars <string> additional backspace chars
agetty[14497]: --kill-chars <string> additional kill chars
agetty[14497]: --help display this help and exit
agetty[14497]: --version output version information and exit
agetty[14497]: For more details see agetty(8).
systemd[1]: [email protected] has no holdoff time, scheduling restart.
systemd[1]: Stopping Getty on tty5...
なぜagettyはオプションを認識したくないのですか？それを行う別の方法はありますか？
バグが発生しました。あります F_NONLソースに見られるように、agettyバイナリで呼び出されることのないディレクティブ：
...
#define F_NONL (1<<17) /* No newline before issue */
...
/* Parse command-line arguments. */
static void parse_args(int argc, char **argv, struct options *op)
{
int c;
enum {
VERSION_OPTION = CHAR_MAX + 1,
NOHINTS_OPTION,
NOHOSTNAME_OPTION,
LONGHOSTNAME_OPTION,
HELP_OPTION,
ERASE_CHARS_OPTION,
KILL_CHARS_OPTION,
};
const struct option longopts[] = {
{ "8bits", no_argument, 0, '8' },
{ "autologin", required_argument, 0, 'a' },
...
{ "skip-login", no_argument, 0, 'n' },
{ "nonewline", no_argument, 0, 'N' },
while ((c = getopt_long(argc, argv,
"8a:cC:d:Ef:hH:iI:Jl:L::mnNo:pP:r:Rst:Uw", longopts,
NULL)) != -1) {
switch (c) {
case '8':
op->flags |= F_EIGHTBITS;
break;
case 'a':
op->autolog = optarg;
break;
case 'c':
op->flags |= F_KEEPCFLAGS;
break;
case 'C':
op->chdir = optarg;
break;
case 'd':
op->delay = atoi(optarg);
break;
case 'E':
op->flags |= F_REMOTE;
break;
case 'f':
op->flags |= F_CUSTISSUE;
op->issue = optarg;
break;
case 'h':
op->flags |= F_RTSCTS;
break;
case 'H':
fakehost = optarg;
break;
case 'i':
op->flags &= ~F_ISSUE;
break;
case 'I':
init_special_char(optarg, op);
op->flags |= F_INITSTRING;
break;
case 'J':
op->flags |= F_NOCLEAR;
break;
case 'l':
op->login = optarg;
break;
case 'L':
/* -L and -L=always have the same meaning */
op->clocal = CLOCAL_MODE_ALWAYS;
if (optarg) {
if (strcmp(optarg, "=always") == 0)
op->clocal = CLOCAL_MODE_ALWAYS;
else if (strcmp(optarg, "=never") == 0)
op->clocal = CLOCAL_MODE_NEVER;
else if (strcmp(optarg, "=auto") == 0)
op->clocal = CLOCAL_MODE_AUTO;
else
log_err(_("invalid argument of --local-line"));
}
break;
case 'm':
op->flags |= F_PARSE;
break;
case 'n':
op->flags |= F_NOPROMPT;
break;
case 'o':
op->logopt = optarg;
break;
case 'p':
op->flags |= F_LOGINPAUSE;
break;
case 'P':
op->Nice = atoi(optarg);
break;
case 'r':
op->chroot = optarg;
break;
case 'R':
op->flags |= F_HANGUP;
break;
case 's':
op->flags |= F_KEEPSPEED;
break;
case 't':
if ((op->timeout = atoi(optarg)) <= 0)
log_err(_("bad timeout value: %s"), optarg);
break;
case 'U':
op->flags |= F_LCUC;
break;
case 'w':
op->flags |= F_WAITCRLF;
break;
case NOHINTS_OPTION:
op->flags |= F_NOHINTS;
break;
case NOHOSTNAME_OPTION:
op->flags |= F_NOHOSTNAME;
break;
case LONGHOSTNAME_OPTION:
op->flags |= F_LONGHNAME;
break;
case ERASE_CHARS_OPTION:
op->erasechars = optarg;
break;
case KILL_CHARS_OPTION:
op->killchars = optarg;
break;
case VERSION_OPTION:
printf(_("%s from %s\n"), program_invocation_short_name,
PACKAGE_STRING);
exit(EXIT_SUCCESS);
case HELP_OPTION:
usage(stdout);
default:
usage(stderr);
}
}
Whileループには、以下のようなブロックがありますが、これは欠落しています。
case 'N':
op->flags |= F_NONL;
break;
追加するのは簡単なパッチだと思います。完全なソースコードは GitHub または kernel.org で確認できます。