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lxc-init: log to /dev/console

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-10-14 22:22:21 +02:00
parent 519825b1f1
commit b30b7eea56
No known key found for this signature in database
GPG Key ID: 8EB056D53EECB12D
3 changed files with 47 additions and 109 deletions
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1
src/lxc/Makefile.am
View File

@ -344,7 +344,6 @@ init_lxc_SOURCES = cmd/lxc_init.c \
compiler.h \
error.h \
initutils.c initutils.h \
log.c log.h \
parse.c parse.h \
raw_syscalls.c raw_syscalls.h \
string_utils.c string_utils.h

114
src/lxc/cmd/lxc_init.c
View File

@ -26,6 +26,7 @@
#endif
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <libgen.h>
#include <limits.h>
@ -46,7 +47,6 @@
#include "config.h"
#include "error.h"
#include "initutils.h"
#include "log.h"
#include "parse.h"
#include "raw_syscalls.h"
#include "string_utils.h"
@ -58,8 +58,6 @@
#define QUOTE(macro) #macro
#define QUOTEVAL(macro) QUOTE(macro)
lxc_log_define(lxc_init, lxc);
static sig_atomic_t was_interrupted;
static void interrupt_handler(int sig)
@ -74,8 +72,6 @@ static struct option long_options[] = {
{ "usage", no_argument, 0, OPT_USAGE },
{ "version", no_argument, 0, OPT_VERSION },
{ "quiet", no_argument, 0, 'q' },
{ "logfile", required_argument, 0, 'o' },
{ "logpriority", required_argument, 0, 'l' },
{ "lxcpath", required_argument, 0, 'P' },
{ 0, 0, 0, 0 }
};
@ -86,8 +82,6 @@ struct arguments {
const char *shortopts;
const char *name;
char *log_file;
char *log_priority;
bool quiet;
const char *lxcpath;
@ -142,19 +136,21 @@ static void prevent_forking(void)
ret = snprintf(path, sizeof(path),
"/sys/fs/cgroup/pids/%s/pids.max", p2);
if (ret < 0 || (size_t)ret >= sizeof(path)) {
ERROR("Failed to create string");
if (my_args.quiet)
fprintf(stderr, "Failed to create string\n");
goto on_error;
}
fd = open(path, O_WRONLY);
if (fd < 0) {
SYSERROR("Failed to open \"%s\"", path);
if (my_args.quiet)
fprintf(stderr, "Failed to open \"%s\"\n", path);
goto on_error;
}
ret = write(fd, "1", 1);
if (ret != 1)
SYSERROR("Failed to write to \"%s\"", path);
if (ret != 1 && !my_args.quiet)
fprintf(stderr, "Failed to write to \"%s\"\n", path);
close(fd);
break;
@ -173,13 +169,15 @@ static void kill_children(pid_t pid)
ret = snprintf(path, sizeof(path), "/proc/%d/task/%d/children", pid, pid);
if (ret < 0 || (size_t)ret >= sizeof(path)) {
ERROR("Failed to create string");
if (my_args.quiet)
fprintf(stderr, "Failed to create string\n");
return;
}
f = fopen(path, "r");
if (!f) {
SYSERROR("Failed to open %s", path);
if (my_args.quiet)
fprintf(stderr, "Failed to open %s\n", path);
return;
}
@ -187,7 +185,8 @@ static void kill_children(pid_t pid)
pid_t pid;
if (fscanf(f, "%d ", &pid) != 1) {
ERROR("Failed to retrieve pid");
if (my_args.quiet)
fprintf(stderr, "Failed to retrieve pid\n");
fclose(f);
return;
}
@ -206,51 +205,33 @@ static void remove_self(void)
char path[PATH_MAX] = {0};
n = readlink("/proc/self/exe", path, sizeof(path));
if (n < 0 || n >= PATH_MAX) {
SYSDEBUG("Failed to readlink \"/proc/self/exe\"");
if (n < 0 || n >= PATH_MAX)
return;
}
path[n] = '\0';
ret = umount2(path, MNT_DETACH);
if (ret < 0) {
SYSDEBUG("Failed to unmount \"%s\"", path);
if (ret < 0)
return;
}
ret = unlink(path);
if (ret < 0) {
SYSDEBUG("Failed to unlink \"%s\"", path);
if (ret < 0)
return;
}
}
int main(int argc, char *argv[])
{
int i, ret;
pid_t pid, sid;
int i, logfd, ret;
pid_t pid;
struct sigaction act;
struct lxc_log log;
sigset_t mask, omask;
int have_status = 0, exit_with = 1, shutdown = 0;
if (arguments_parse(&my_args, argc, argv))
exit(EXIT_FAILURE);
log.prefix = "lxc-init";
log.name = my_args.name;
log.file = my_args.log_file;
log.level = my_args.log_priority;
log.quiet = my_args.quiet;
log.lxcpath = my_args.lxcpath;
ret = lxc_log_init(&log);
if (ret < 0)
exit(EXIT_FAILURE);
lxc_log_options_no_override();
if (!my_args.argc) {
ERROR("Please specify a command to execute");
if (my_args.quiet)
fprintf(stderr, "Please specify a command to execute\n");
exit(EXIT_FAILURE);
}
@ -319,7 +300,8 @@ int main(int argc, char *argv[])
if (errno == EINVAL)
continue;
SYSERROR("Failed to change signal action");
if (my_args.quiet)
fprintf(stderr, "Failed to change signal action\n");
exit(EXIT_FAILURE);
}
}
@ -340,34 +322,34 @@ int main(int argc, char *argv[])
continue;
sigerr = signal(i, SIG_DFL);
if (sigerr == SIG_ERR) {
SYSDEBUG("Failed to reset to default action "
"for signal \"%d\": %d", i, pid);
}
if (sigerr == SIG_ERR && !my_args.quiet)
fprintf(stderr, "Failed to reset to default action for signal \"%d\": %d\n", i, pid);
}
ret = pthread_sigmask(SIG_SETMASK, &omask, NULL);
if (ret < 0) {
SYSERROR("Failed to set signal mask");
if (my_args.quiet)
fprintf(stderr, "Failed to set signal mask\n");
exit(EXIT_FAILURE);
}
sid = setsid();
if (sid < 0)
DEBUG("Failed to make child session leader");
(void)setsid();
if (ioctl(STDIN_FILENO, TIOCSCTTY, 0) < 0)
DEBUG("Failed to set controlling terminal");
NOTICE("Exec'ing \"%s\"", my_args.argv[0]);
(void)ioctl(STDIN_FILENO, TIOCSCTTY, 0);
ret = execvp(my_args.argv[0], my_args.argv);
SYSERROR("Failed to exec \"%s\"", my_args.argv[0]);
if (my_args.quiet)
fprintf(stderr, "Failed to exec \"%s\"\n", my_args.argv[0]);
exit(ret);
}
logfd = open("/dev/console", O_WRONLY | O_NOCTTY | O_CLOEXEC);
if (logfd >= 0) {
ret = dup3(logfd, STDERR_FILENO, O_CLOEXEC);
if (ret < 0)
exit(EXIT_FAILURE);
}
INFO("Attempting to set proc title to \"init\"");
setproctitle("init");
(void)setproctitle("init");
/* Let's process the signals now. */
ret = sigdelset(&omask, SIGALRM);
@ -376,7 +358,8 @@ int main(int argc, char *argv[])
ret = pthread_sigmask(SIG_SETMASK, &omask, NULL);
if (ret < 0) {
SYSERROR("Failed to set signal mask");
if (my_args.quiet)
fprintf(stderr, "Failed to set signal mask\n");
exit(EXIT_FAILURE);
}
@ -413,8 +396,8 @@ int main(int argc, char *argv[])
kill_children(mypid);
} else {
ret = kill(-1, SIGTERM);
if (ret < 0)
SYSDEBUG("Failed to send SIGTERM to all children");
if (ret < 0 && !my_args.quiet)
fprintf(stderr, "Failed to send SIGTERM to all children\n");
}
alarm(1);
}
@ -427,15 +410,13 @@ int main(int argc, char *argv[])
kill_children(mypid);
} else {
ret = kill(-1, SIGKILL);
if (ret < 0)
SYSDEBUG("Failed to send SIGTERM to all children");
if (ret < 0 && !my_args.quiet)
fprintf(stderr, "Failed to send SIGTERM to all children\n");
}
break;
}
default:
ret = kill(pid, was_interrupted);
if (ret < 0)
SYSDEBUG("Failed to send signal \"%d\" to %d", was_interrupted, pid);
break;
}
ret = EXIT_SUCCESS;
@ -449,7 +430,8 @@ int main(int argc, char *argv[])
if (errno == EINTR)
continue;
SYSERROR("Failed to wait on child %d", pid);
if (my_args.quiet)
fprintf(stderr, "Failed to wait on child %d\n", pid);
goto out;
}
@ -475,7 +457,7 @@ __noreturn static void print_usage_exit(const struct option longopts[])
{
fprintf(stderr, "Usage: lxc-init [-n|--name=NAME] [-h|--help] [--usage] [--version]\n\
[-q|--quiet] [-o|--logfile=LOGFILE] [-l|--logpriority=LOGPRIORITY] [-P|--lxcpath=LXCPATH]\n");
[-q|--quiet] [-P|--lxcpath=LXCPATH]\n");
exit(0);
}
@ -494,8 +476,6 @@ Usage: lxc-init --name=NAME -- COMMAND\n\
\n\
Options :\n\
-n, --name=NAME NAME of the container\n\
-o, --logfile=FILE Output log to FILE instead of stderr\n\
-l, --logpriority=LEVEL Set log priority to LEVEL\n\
-q, --quiet Don't produce any output\n\
-P, --lxcpath=PATH Use specified container path\n\
-?, --help Give this help list\n\
@ -523,10 +503,8 @@ static int arguments_parse(struct arguments *args, int argc,
args->name = optarg;
break;
case 'o':
args->log_file = optarg;
break;
case 'l':
args->log_priority = optarg;
break;
case 'q':
args->quiet = true;

41
src/lxc/execute.c
View File

@ -44,10 +44,8 @@ static int execute_start(struct lxc_handler *handler, void* data)
{
int argc_add, j;
char **argv;
int argc = 0, i = 0, logfd = -1;
int argc = 0, i = 0;
struct execute_args *my_args = data;
char logfile[LXC_PROC_PID_FD_LEN];
bool is_privileged = lxc_list_empty(&handler->conf->id_map);
while (my_args->argv[argc++]);
@ -59,14 +57,6 @@ static int execute_start(struct lxc_handler *handler, void* data)
if (!handler->conf->rootfs.path)
argc_add += 2;
if (is_privileged) {
if (lxc_log_has_valid_level())
argc_add += 2;
if (current_config->logfd != -1 || lxc_log_fd != -1)
argc_add += 2;
}
argv = malloc((argc + argc_add) * sizeof(*argv));
if (!argv) {
SYSERROR("Allocating init args failed");
@ -81,32 +71,6 @@ static int execute_start(struct lxc_handler *handler, void* data)
argv[i++] = "-n";
argv[i++] = (char *)handler->name;
if (lxc_log_has_valid_level()) {
argv[i++] = "-l";
argv[i++] = (char *)lxc_log_priority_to_string(lxc_log_get_level());
}
if (is_privileged && (current_config->logfd != -1 || lxc_log_fd != -1)) {
int ret;
int to_dup = current_config->logfd;
if (current_config->logfd == -1)
to_dup = lxc_log_fd;
logfd = dup(to_dup);
if (logfd < 0) {
SYSERROR("Failed to duplicate log file descriptor");
goto out2;
}
ret = snprintf(logfile, sizeof(logfile), "/proc/self/fd/%d", logfd);
if (ret < 0 || (size_t)ret >= sizeof(logfile))
goto out3;
argv[i++] = "-o";
argv[i++] = logfile;
}
if (my_args->quiet)
argv[i++] = "--quiet";
@ -128,9 +92,6 @@ static int execute_start(struct lxc_handler *handler, void* data)
execvp(argv[0], argv);
SYSERROR("Failed to exec %s", argv[0]);
out3:
close(logfd);
out2:
free(argv);
out1:
return 1;