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getty: move automatic serial getty logic into generator

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This commit is contained in:
Lennart Poettering 2011-03-15 00:44:13 +01:00
parent 2fc9784656
commit 2a796654b9
7 changed files with 144 additions and 73 deletions
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1
.gitignore vendored
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@ -1,3 +1,4 @@
systemd-getty-generator
systemd-nspawn
systemd-stdio-bridge
systemd-machine-id-setup

15
Makefile.am
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@ -143,11 +143,14 @@ rootlibexec_PROGRAMS = \
systemd-detect-virt \
systemd-sysctl
systemgenerator_PROGRAMS = \
systemd-getty-generator
if HAVE_LIBCRYPTSETUP
rootlibexec_PROGRAMS += \
systemd-cryptsetup
systemgenerator_PROGRAMS = \
systemgenerator_PROGRAMS += \
systemd-cryptsetup-generator
endif
@ -856,6 +859,16 @@ systemd_cryptsetup_generator_CFLAGS = \
systemd_cryptsetup_generator_LDADD = \
libsystemd-basic.la
systemd_getty_generator_SOURCES = \
src/getty-generator.c \
src/unit-name.c
systemd_getty_generator_CFLAGS = \
$(AM_CFLAGS)
systemd_getty_generator_LDADD = \
libsystemd-basic.la
systemd_user_sessions_SOURCES = \
src/user-sessions.c \
src/cgroup-util.c

2
TODO
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@ -24,8 +24,6 @@ F15:
* capability_bounding_set_drop not used.
* remove getty magic, move it into a generator
* recreate private socket on SIGUSR2
Features:

3
src/cryptsetup-generator.c
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@ -222,7 +222,8 @@ int main(int argc, char *argv[]) {
return EXIT_FAILURE;
}
arg_dest = argv[1];
if (argc > 1)
arg_dest = argv[1];
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
log_parse_environment();

127
src/getty-generator.c Normal file
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@ -0,0 +1,127 @@
/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU 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 "unit-name.h"
const char *arg_dest = "/tmp";
static int add_symlink(const char *fservice, const char *tservice) {
char *from = NULL, *to = NULL;
int r;
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);
if ((r = symlink(from, to)) < 0) {
log_error("Failed to create symlink from %s to %s: %m", from, to);
r = -errno;
}
finish:
free(from);
free(to);
return r;
}
int main(int argc, char *argv[]) {
int r = EXIT_SUCCESS;
char *active;
if (argc > 2) {
log_error("This program takes one or no arguments.");
return EXIT_FAILURE;
}
if (argc > 1)
arg_dest = argv[1];
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
log_parse_environment();
log_open();
if (detect_container(NULL) > 0) {
log_debug("Automatic 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;
truncate_nl(active);
if ((tty = strrchr(active, ' ')))
tty ++;
else
tty = active;
/* Automatically add in a serial getty on the kernel
* console */
if (!tty_is_vc(tty)) {
char *n;
/* We assume that gettys on virtual terminals are
* started via manual configuration and do this magic
* only for non-VC terminals. */
log_debug("Automatically adding serial getty for /dev/%s.", tty);
if (!(n = unit_name_replace_instance("serial-getty@.service", tty)) ||
add_symlink("serial-getty@.service", n) < 0)
r = EXIT_FAILURE;
free(n);
}
free(active);
}
/* Automatically add in a serial getty on the first
* virtualizer console */
if (access("/sys/class/tty/hvc0", F_OK) == 0) {
log_debug("Automatic adding serial getty for hvc0.");
if (add_symlink("serial-getty@.service", "serial-getty@hvc0.service") < 0)
r = EXIT_FAILURE;
}
finish:
return r;
}

2
src/special.h
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@ -63,8 +63,6 @@
#define SPECIAL_KEXEC_TARGET "kexec.target"
#define SPECIAL_DBUS_SERVICE "dbus.service"
#define SPECIAL_DBUS_SOCKET "dbus.socket"
#define SPECIAL_GETTY_TARGET "getty.target"
#define SPECIAL_SERIAL_GETTY_SERVICE "serial-getty@.service"
#define SPECIAL_REMOUNT_ROOTFS_SERVICE "remount-rootfs.service"
#ifndef SPECIAL_SYSLOG_SERVICE

67
src/target.c
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@ -83,70 +83,6 @@ static int target_add_default_dependencies(Target *t) {
return unit_add_dependency_by_name(UNIT(t), UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int target_add_getty_dependencies(Target *t) {
char *n, *active;
int r;
assert(t);
if (!unit_has_name(UNIT(t), SPECIAL_GETTY_TARGET))
return 0;
if (detect_container(NULL) > 0)
return 1;
if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
const char *tty;
truncate_nl(active);
if ((tty = strrchr(active, ' ')))
tty ++;
else
tty = active;
/* Automatically add in a serial getty on the kernel
* console */
if (!tty_is_vc(tty)) {
/* We assume that gettys on virtual terminals are
* started via manual configuration and do this magic
* only for non-VC terminals. */
log_debug("Automatically adding serial getty for /dev/%s", tty);
if (!(n = unit_name_replace_instance(SPECIAL_SERIAL_GETTY_SERVICE, tty))) {
free(active);
return -ENOMEM;
}
r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_WANTS, n, NULL, true);
free(n);
if (r < 0) {
free(active);
return r;
}
}
free(active);
}
/* Automatically add in a serial getty on the first
* virtualizer console */
if (access("/sys/class/tty/hvc0", F_OK) == 0) {
log_debug("Automatic adding serial getty for hvc0");
if (!(n = unit_name_replace_instance(SPECIAL_SERIAL_GETTY_SERVICE, "hvc0")))
return -ENOMEM;
r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_WANTS, n, NULL, true);
free(n);
if (r < 0)
return r;
}
return 0;
}
static int target_load(Unit *u) {
Target *t = TARGET(u);
int r;
@ -161,9 +97,6 @@ static int target_load(Unit *u) {
if (u->meta.default_dependencies)
if ((r = target_add_default_dependencies(t)) < 0)
return r;
if ((r = target_add_getty_dependencies(t)) < 0)
return r;
}
return 0;