Tty刪除 tty 中
刪除 tty 中 /etc/issue 之前的換行符
我想刪除
/etc/issue在登錄提示內容之前插入的預設換行符tty。我正在使用agetty和systemd。我試圖將
--nonewline選項添加到我的getty@tty5.service：ExecStart=/sbin/agetty --nonewline --noclear %I $TERM結果是：
# systemctl status -l getty@tty5.service ● getty@tty5.service - Getty on tty5 Loaded: loaded (/usr/lib/systemd/system/getty@.service; 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]: getty@tty5.service has no holdoff time, scheduling restart. systemd[1]: Stopping Getty on tty5... systemd[1]: Starting Getty on tty5... systemd[1]: getty@tty5.service start request repeated too quickly, refusing to start. systemd[1]: Failed to start Getty on tty5. systemd[1]: Unit getty@tty5.service entered failed state.我得到：
# journalctl --no-pager -b -u getty@tty5.service -- 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]: getty@tty5.service has no holdoff time, scheduling restart. systemd[1]: Stopping Getty on tty5...為什麼
agetty不想辨識選項？還有另一種方法嗎？
你遇到了一個錯誤！
F_NONL從原始碼中可以看出，有一個指令永遠不會在 agetty 二進製文件中被呼叫：... #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); } }在 while 循環中應該有一個像下面這樣的塊，它是缺失的。
case 'N': op->flags |= F_NONL; break;我認為這是一個微不足道的更新檔。您可以在GitHub或kernel.org中查看完整的原始碼。