diff options
Diffstat (limited to 'src/getty-generator/getty-generator.c')
| -rw-r--r-- | src/getty-generator/getty-generator.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/getty-generator/getty-generator.c b/src/getty-generator/getty-generator.c new file mode 100644 index 0000000000..58ad8a6635 --- /dev/null +++ b/src/getty-generator/getty-generator.c @@ -0,0 +1,183 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + 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 <string.h> +#include <errno.h> +#include <unistd.h> + +#include "log.h" +#include "util.h" +#include "mkdir.h" +#include "unit-name.h" +#include "virt.h" + +static const char *arg_dest = "/tmp"; + +static int add_symlink(const char *fservice, const char *tservice) { + char *from = NULL, *to = NULL; + int r; + + assert(fservice); + assert(tservice); + + asprintf(&from, SYSTEM_DATA_UNIT_PATH "/%s", fservice); + asprintf(&to, "%s/getty.target.wants/%s", arg_dest, tservice); + + if (!from || !to) { + log_error("Out of memory"); + r = -ENOMEM; + goto finish; + } + + mkdir_parents(to, 0755); + + r = symlink(from, to); + if (r < 0) { + if (errno == EEXIST) + /* In case console=hvc0 is passed this will very likely result in EEXIST */ + r = 0; + else { + log_error("Failed to create symlink from %s to %s: %m", from, to); + r = -errno; + } + } + +finish: + + free(from); + free(to); + + return r; +} + +static int add_serial_getty(const char *tty) { + char *n; + int r; + + assert(tty); + + log_debug("Automatically adding serial getty for /dev/%s.", tty); + + n = unit_name_replace_instance("serial-getty@.service", tty); + if (!n) { + log_error("Out of memory"); + return -ENOMEM; + } + + r = add_symlink("serial-getty@.service", n); + free(n); + + return r; +} + +int main(int argc, char *argv[]) { + + static const char virtualization_consoles[] = + "hvc0\0" + "xvc0\0" + "hvsi0\0"; + + int r = EXIT_SUCCESS; + char *active; + const char *j; + + if (argc > 2) { + log_error("This program takes one or no arguments."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + if (argc > 1) + arg_dest = argv[1]; + + if (detect_container(NULL) > 0) { + log_debug("Automatically adding console shell."); + + if (add_symlink("console-shell.service", "console-shell.service") < 0) + r = EXIT_FAILURE; + + /* Don't add any further magic if we are in a container */ + goto finish; + } + + if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { + const char *tty; + + tty = strrchr(active, ' '); + if (tty) + tty ++; + else + tty = active; + + /* Automatically add in a serial getty on the kernel + * console */ + if (tty_is_vc(tty)) + free(active); + else { + int k; + + /* We assume that gettys on virtual terminals are + * started via manual configuration and do this magic + * only for non-VC terminals. */ + + k = add_serial_getty(tty); + free(active); + + if (k < 0) { + r = EXIT_FAILURE; + goto finish; + } + } + } + + /* Automatically add in a serial getty on the first + * virtualizer console */ + NULSTR_FOREACH(j, virtualization_consoles) { + char *p; + int k; + + if (asprintf(&p, "/sys/class/tty/%s", j) < 0) { + log_error("Out of memory"); + r = EXIT_FAILURE; + goto finish; + } + + k = access(p, F_OK); + free(p); + + if (k < 0) + continue; + + k = add_serial_getty(j); + if (k < 0) { + r = EXIT_FAILURE; + goto finish; + } + } + +finish: + return r; +} |