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cgpath.c
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cgpath.c
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/* liblxcapi
*
* Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
* Copyright © 2012 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <lxc/lxccontainer.h>
#include <limits.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include "cgroup.h"
#include "commands.h"
#include "lxc.h"
#include "lxctest.h"
#include "utils.h"
#ifndef HAVE_STRLCPY
#include "include/strlcpy.h"
#endif
#define MYNAME "lxctest1"
#define TSTERR(fmt, ...) do { \
fprintf(stderr, "%s:%d " fmt "\n", __FILE__, __LINE__, ##__VA_ARGS__); \
} while (0)
/*
* test_running_container: test cgroup functions against a running container
*
* @name : name of the container
*/
static int test_running_container(const char *lxcpath, const char *name)
{
__do_close int fd_log = -EBADF;
int ret = -1;
struct lxc_container *c = NULL;
struct lxc_log log = {};
char template[sizeof(P_tmpdir"/attach_XXXXXX")];
char *cgrelpath;
char relpath[PATH_MAX+1];
char value[NAME_MAX], value_save[NAME_MAX];
call_cleaner(cgroup_exit) struct cgroup_ops *cgroup_ops = NULL;
(void)strlcpy(template, P_tmpdir"/attach_XXXXXX", sizeof(template));
fd_log = lxc_make_tmpfile(template, false);
if (fd_log < 0) {
lxc_error("Failed to create temporary log file for container %s\n", name);
exit(EXIT_FAILURE);
}
log.name = name;
log.file = template;
log.level = "TRACE";
log.prefix = "cgpath";
log.quiet = false;
log.lxcpath = NULL;
if (lxc_log_init(&log))
goto err1;
sprintf(relpath, DEFAULT_PAYLOAD_CGROUP_PREFIX "%s", name);
if ((c = lxc_container_new(name, lxcpath)) == NULL) {
TSTERR("container %s couldn't instantiate", name);
goto err1;
}
if (!c->is_defined(c)) {
TSTERR("container %s does not exist", name);
goto err2;
}
cgrelpath = lxc_cmd_get_cgroup_path(c->name, c->config_path, "freezer");
if (!cgrelpath) {
TSTERR("lxc_cmd_get_cgroup_path returned NULL");
goto err2;
}
if (!strstr(cgrelpath, relpath)) {
TSTERR("lxc_cmd_get_cgroup_path %s not in %s", relpath, cgrelpath);
goto err3;
}
cgroup_ops = cgroup_init(c->lxc_conf);
if (!cgroup_ops)
goto err3;
/* test get/set value using memory.soft_limit_in_bytes file */
ret = cgroup_ops->get(cgroup_ops, "pids.max", value, sizeof(value),
c->name, c->config_path);
if (ret < 0) {
TSTERR("cgroup_get failed");
goto err3;
}
(void)strlcpy(value_save, value, NAME_MAX);
ret = cgroup_ops->set(cgroup_ops, "pids.max", "10000",
c->name, c->config_path);
if (ret < 0) {
TSTERR("cgroup_set failed %d %d", ret, errno);
goto err3;
}
ret = cgroup_ops->get(cgroup_ops, "pids.max", value,
sizeof(value), c->name, c->config_path);
if (ret < 0) {
TSTERR("cgroup_get failed");
goto err3;
}
if (strcmp(value, "10000\n")) {
TSTERR("cgroup_set_bypath failed to set value >%s<", value);
goto err3;
}
/* restore original value */
ret = cgroup_ops->set(cgroup_ops, "pids.max",
value_save, c->name, c->config_path);
if (ret < 0) {
TSTERR("cgroup_set failed");
goto err3;
}
ret = 0;
err3:
free(cgrelpath);
err2:
lxc_container_put(c);
err1:
if (ret != 0) {
char buf[4096];
ssize_t buflen;
while ((buflen = read(fd_log, buf, 1024)) > 0) {
buflen = write(STDERR_FILENO, buf, buflen);
if (buflen <= 0)
break;
}
}
(void)unlink(template);
return ret;
}
static int test_container(const char *lxcpath, const char *name,
const char *template)
{
int ret;
struct lxc_container *c = NULL;
if (lxcpath) {
ret = mkdir(lxcpath, 0755);
if (ret < 0 && errno != EEXIST) {
TSTERR("failed to mkdir %s %s", lxcpath, strerror(errno));
goto out1;
}
}
ret = -1;
if ((c = lxc_container_new(name, lxcpath)) == NULL) {
TSTERR("instantiating container %s", name);
goto out1;
}
if (c->is_defined(c)) {
c->stop(c);
c->destroy(c);
c = lxc_container_new(name, lxcpath);
}
c->set_config_item(c, "lxc.net.0.type", "empty");
if (!c->createl(c, template, NULL, NULL, 0, NULL)) {
TSTERR("creating container %s", name);
goto out2;
}
c->load_config(c, NULL);
c->want_daemonize(c, true);
if (!c->startl(c, 0, NULL)) {
TSTERR("starting container %s", name);
goto out3;
}
ret = test_running_container(lxcpath, name);
c->stop(c);
out3:
c->destroy(c);
out2:
lxc_container_put(c);
out1:
return ret;
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
/* won't require privilege necessarily once users are classified by
* pam_cgroup */
if (geteuid() != 0) {
TSTERR("requires privilege");
exit(EXIT_SUCCESS);
}
#if TEST_ALREADY_RUNNING_CT
/*
* This is useful for running with valgrind to test for memory
* leaks. The container should already be running, we can't start
* the container ourselves because valgrind gets confused by lxc's
* internal calls to clone.
*/
if (test_running_container(NULL, "bb01") < 0)
goto out;
printf("Running container cgroup tests...Passed\n");
#else
if (test_container(NULL, MYNAME, "busybox") < 0)
goto out;
printf("Container creation tests...Passed\n");
if (test_container("/var/lib/lxctest2", MYNAME, "busybox") < 0)
goto out;
printf("Container creation with LXCPATH tests...Passed\n");
#endif
ret = EXIT_SUCCESS;
out:
return ret;
}