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nspawn: move container into its own name=systemd cgroup

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This commit is contained in:
Lennart Poettering 2011-03-14 22:33:31 +01:00
parent e03ae6615a
commit 04d391dabc
2 changed files with 36 additions and 6 deletions
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6
Makefile.am
View file

@ -985,13 +985,15 @@ systemd_cgls_LDADD = \
libsystemd-basic.la
systemd_nspawn_SOURCES = \
src/nspawn.c
src/nspawn.c \
src/cgroup-util.c
systemd_nspawn_CFLAGS = \
$(AM_CFLAGS)
systemd_nspawn_LDADD = \
libsystemd-basic.la
libsystemd-basic.la \
libsystemd-daemon.la
systemd_stdio_bridge_SOURCES = \
src/bridge.c

36
src/nspawn.c
View file

@ -37,6 +37,8 @@
#include "log.h"
#include "util.h"
#include "missing.h"
#include "cgroup-util.h"
#include "sd-daemon.h"
static char *arg_directory = NULL;
@ -347,7 +349,8 @@ static int is_os_tree(const char *path) {
int main(int argc, char *argv[]) {
pid_t pid = 0;
int r = EXIT_FAILURE;
int r = EXIT_FAILURE, k;
char *oldcg = NULL, *newcg = NULL;
log_parse_environment();
log_open();
@ -376,6 +379,11 @@ int main(int argc, char *argv[]) {
goto finish;
}
if (sd_booted() <= 0) {
log_error("Not running on a systemd system.");
goto finish;
}
if (path_equal(arg_directory, "/")) {
log_error("Spawning container on root directory not supported.");
goto finish;
@ -388,6 +396,21 @@ int main(int argc, char *argv[]) {
log_info("Spawning namespace container on %s.", arg_directory);
if ((k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg)) < 0) {
log_error("Failed to determine current cgroup: %s", strerror(-k));
goto finish;
}
if (asprintf(&newcg, "%s/nspawn-%lu", oldcg, (unsigned long) getpid()) < 0) {
log_error("Failed to allocate cgroup path.");
goto finish;
}
if ((k = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, newcg, 0)) < 0) {
log_error("Failed to create cgroup: %s", strerror(-k));
goto finish;
}
if ((pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS, NULL)) < 0) {
log_error("clone() failed: %m");
goto finish;
@ -453,10 +476,15 @@ int main(int argc, char *argv[]) {
r = EXIT_FAILURE;
finish:
free(arg_directory);
if (oldcg)
cg_attach(SYSTEMD_CGROUP_CONTROLLER, oldcg, 0);
if (pid > 0)
kill(pid, SIGTERM);
if (newcg)
cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, newcg, true);
free(arg_directory);
free(oldcg);
free(newcg);
return r;
}