./tools/notsd-move

1 files changed, 233 insertions, 0 deletions

diff --git a/src/systemd-getty-generator/getty-generator.c b/src/systemd-getty-generator/getty-generator.c
new file mode 100644
index 0000000000..6e60cbab4f
--- /dev/null
+++ b/src/systemd-getty-generator/getty-generator.c
@@ -0,0 +1,233 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/terminal-util.h"
+#include "systemd-basic/unit-name.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/virt.h"
+
+static const char *arg_dest = "/tmp";
+
+static int add_symlink(const char *fservice, const char *tservice) {
+        char *from, *to;
+        int r;
+
+        assert(fservice);
+        assert(tservice);
+
+        from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice);
+        to = strjoina(arg_dest, "/getty.target.wants/", tservice);
+
+        mkdir_parents_label(to, 0755);
+
+        r = symlink(from, to);
+        if (r < 0) {
+                /* In case console=hvc0 is passed this will very likely result in EEXIST */
+                if (errno == EEXIST)
+                        return 0;
+
+                return log_error_errno(errno, "Failed to create symlink %s: %m", to);
+        }
+
+        return 0;
+}
+
+static int add_serial_getty(const char *tty) {
+        _cleanup_free_ char *n = NULL;
+        int r;
+
+        assert(tty);
+
+        log_debug("Automatically adding serial getty for /dev/%s.", tty);
+
+        r = unit_name_from_path_instance("serial-getty", tty, ".service", &n);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate service name: %m");
+
+        return add_symlink("serial-getty@.service", n);
+}
+
+static int add_container_getty(const char *tty) {
+        _cleanup_free_ char *n = NULL;
+        int r;
+
+        assert(tty);
+
+        log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
+
+        r = unit_name_from_path_instance("container-getty", tty, ".service", &n);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate service name: %m");
+
+        return add_symlink("container-getty@.service", n);
+}
+
+static int verify_tty(const char *name) {
+        _cleanup_close_ int fd = -1;
+        const char *p;
+
+        /* Some TTYs are weird and have been enumerated but don't work
+         * when you try to use them, such as classic ttyS0 and
+         * friends. Let's check that and open the device and run
+         * isatty() on it. */
+
+        p = strjoina("/dev/", name);
+
+        /* O_NONBLOCK is essential here, to make sure we don't wait
+         * for DCD */
+        fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW);
+        if (fd < 0)
+                return -errno;
+
+        errno = 0;
+        if (isatty(fd) <= 0)
+                return errno > 0 ? -errno : -EIO;
+
+        return 0;
+}
+
+int main(int argc, char *argv[]) {
+
+        static const char virtualization_consoles[] =
+                "hvc0\0"
+                "xvc0\0"
+                "hvsi0\0"
+                "sclp_line0\0"
+                "ttysclp0\0"
+                "3270!tty1\0";
+
+        _cleanup_free_ char *active = NULL;
+        const char *j;
+        int r;
+
+        if (argc > 1 && argc != 4) {
+                log_error("This program takes three or no arguments.");
+                return EXIT_FAILURE;
+        }
+
+        if (argc > 1)
+                arg_dest = argv[1];
+
+        log_set_target(LOG_TARGET_SAFE);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        if (detect_container() > 0) {
+                _cleanup_free_ char *container_ttys = NULL;
+
+                log_debug("Automatically adding console shell.");
+
+                if (add_symlink("console-getty.service", "console-getty.service") < 0)
+                        return EXIT_FAILURE;
+
+                /* When $container_ttys is set for PID 1, spawn
+                 * gettys on all ptys named therein. Note that despite
+                 * the variable name we only support ptys here. */
+
+                r = getenv_for_pid(1, "container_ttys", &container_ttys);
+                if (r > 0) {
+                        const char *word, *state;
+                        size_t l;
+
+                        FOREACH_WORD(word, l, container_ttys, state) {
+                                const char *t;
+                                char tty[l + 1];
+
+                                memcpy(tty, word, l);
+                                tty[l] = 0;
+
+                                /* First strip off /dev/ if it is specified */
+                                t = path_startswith(tty, "/dev/");
+                                if (!t)
+                                        t = tty;
+
+                                /* Then, make sure it's actually a pty */
+                                t = path_startswith(t, "pts/");
+                                if (!t)
+                                        continue;
+
+                                if (add_container_getty(t) < 0)
+                                        return EXIT_FAILURE;
+                        }
+                }
+
+                /* Don't add any further magic if we are in a container */
+                return EXIT_SUCCESS;
+        }
+
+        if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
+                const char *word, *state;
+                size_t l;
+
+                /* Automatically add in a serial getty on all active
+                 * kernel consoles */
+                FOREACH_WORD(word, l, active, state) {
+                        _cleanup_free_ char *tty = NULL;
+
+                        tty = strndup(word, l);
+                        if (!tty) {
+                                log_oom();
+                                return EXIT_FAILURE;
+                        }
+
+                        if (isempty(tty) || tty_is_vc(tty))
+                                continue;
+
+                        if (verify_tty(tty) < 0)
+                                continue;
+
+                        /* We assume that gettys on virtual terminals are
+                         * started via manual configuration and do this magic
+                         * only for non-VC terminals. */
+
+                        if (add_serial_getty(tty) < 0)
+                                return EXIT_FAILURE;
+                }
+        }
+
+        /* Automatically add in a serial getty on the first
+         * virtualizer console */
+        NULSTR_FOREACH(j, virtualization_consoles) {
+                char *p;
+
+                p = strjoina("/sys/class/tty/", j);
+                if (access(p, F_OK) < 0)
+                        continue;
+
+                if (add_serial_getty(j) < 0)
+                        return EXIT_FAILURE;
+        }
+
+        return EXIT_SUCCESS;
+}