src/tests/shortlived.c

   1 /* liblxcapi
   2  *
   3  * Copyright © 2017 Christian Brauner <christian.brauner@ubuntu.com>.
   4  * Copyright © 2017 Canonical Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19 #include <lxc/lxccontainer.h>
  20
  21 #include <unistd.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30
  31 #include "lxctest.h"
  32 #include "utils.h"
  33
  34 #ifndef HAVE_STRLCPY
  35 #include "include/strlcpy.h"
  36 #endif
  37
  38 #define MYNAME "shortlived"
  39
  40 static int destroy_container(void)
  41 {
  42         int status, ret;
  43         pid_t pid = fork();
  44
  45         if (pid < 0) {
  46                 perror("fork");
  47                 return -1;
  48         }
  49         if (pid == 0) {
  50                 execlp("lxc-destroy", "lxc-destroy", "-f", "-n", MYNAME, NULL);
  51                 exit(EXIT_FAILURE);
  52         }
  53 again:
  54         ret = waitpid(pid, &status, 0);
  55         if (ret == -1) {
  56                 if (errno == EINTR)
  57                         goto again;
  58                 perror("waitpid");
  59                 return -1;
  60         }
  61         if (ret != pid)
  62                 goto again;
  63         if (!WIFEXITED(status))  { // did not exit normally
  64                 fprintf(stderr, "%d: lxc-create exited abnormally\n", __LINE__);
  65                 return -1;
  66         }
  67         return WEXITSTATUS(status);
  68 }
  69
  70 static int create_container(void)
  71 {
  72         int status, ret;
  73         pid_t pid = fork();
  74
  75         if (pid < 0) {
  76                 perror("fork");
  77                 return -1;
  78         }
  79         if (pid == 0) {
  80                 execlp("lxc-create", "lxc-create", "-t", "busybox", "-n", MYNAME, NULL);
  81                 exit(EXIT_FAILURE);
  82         }
  83 again:
  84         ret = waitpid(pid, &status, 0);
  85         if (ret == -1) {
  86                 if (errno == EINTR)
  87                         goto again;
  88                 perror("waitpid");
  89                 return -1;
  90         }
  91         if (ret != pid)
  92                 goto again;
  93         if (!WIFEXITED(status))  { // did not exit normally
  94                 fprintf(stderr, "%d: lxc-create exited abnormally\n", __LINE__);
  95                 return -1;
  96         }
  97         return WEXITSTATUS(status);
  98 }
  99
 100 int main(int argc, char *argv[])
 101 {
 102         int fd, i;
 103         const char *s;
 104         bool b;
 105         struct lxc_container *c;
 106         struct lxc_log log;
 107         char template[sizeof(P_tmpdir"/shortlived_XXXXXX")];
 108         int ret = EXIT_FAILURE;
 109
 110         (void)strlcpy(template, P_tmpdir"/shortlived_XXXXXX", sizeof(template));
 111
 112         i = lxc_make_tmpfile(template, false);
 113         if (i < 0) {
 114                 lxc_error("Failed to create temporary log file for container %s\n", MYNAME);
 115                 exit(EXIT_FAILURE);
 116         } else {
 117                 lxc_debug("Using \"%s\" as temporary log file for container %s\n", template, MYNAME);
 118                 close(i);
 119         }
 120
 121         log.name = MYNAME;
 122         log.file = template;
 123         log.level = "TRACE";
 124         log.prefix = "shortlived";
 125         log.quiet = false;
 126         log.lxcpath = NULL;
 127         if (lxc_log_init(&log))
 128                 exit(EXIT_FAILURE);
 129
 130         /* test a real container */
 131         c = lxc_container_new(MYNAME, NULL);
 132         if (!c) {
 133                 fprintf(stderr, "%d: error creating lxc_container %s\n", __LINE__, MYNAME);
 134                 goto out;
 135         }
 136
 137         if (c->is_defined(c)) {
 138                 fprintf(stderr, "%d: %s thought it was defined\n", __LINE__, MYNAME);
 139                 goto out;
 140         }
 141
 142         if (create_container() < 0) {
 143                 fprintf(stderr, "%d: failed to create a container\n", __LINE__);
 144                 goto out;
 145         }
 146
 147         b = c->is_defined(c);
 148         if (!b) {
 149                 fprintf(stderr, "%d: %s thought it was not defined\n", __LINE__, MYNAME);
 150                 goto out;
 151         }
 152
 153         s = c->state(c);
 154         if (!s || strcmp(s, "STOPPED")) {
 155                 fprintf(stderr, "%d: %s is in state %s, not in STOPPED.\n", __LINE__, c->name, s ? s : "undefined");
 156                 goto out;
 157         }
 158
 159         b = c->load_config(c, NULL);
 160         if (!b) {
 161                 fprintf(stderr, "%d: %s failed to read its config\n", __LINE__, c->name);
 162                 goto out;
 163         }
 164
 165         if (!c->set_config_item(c, "lxc.init.cmd", "echo hello")) {
 166                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 167                 goto out;
 168         }
 169
 170         if (!c->set_config_item(c, "lxc.execute.cmd", "echo hello")) {
 171                 fprintf(stderr, "%d: failed setting lxc.execute.cmd\n", __LINE__);
 172                 goto out;
 173         }
 174
 175         c->want_daemonize(c, true);
 176
 177         /* Test whether we can start a really short-lived daemonized container. */
 178         for (i = 0; i < 10; i++) {
 179                 if (!c->startl(c, 0, NULL)) {
 180                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 181                         goto out;
 182                 }
 183
 184                 if (!c->wait(c, "STOPPED", 30)) {
 185                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 186                         goto out;
 187                 }
 188         }
 189
 190         /* Test whether we can start a really short-lived daemonized container with lxc-init. */
 191         for (i = 0; i < 10; i++) {
 192                 if (!c->startl(c, 1, NULL)) {
 193                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 194                         goto out;
 195                 }
 196
 197                 if (!c->wait(c, "STOPPED", 30)) {
 198                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 199                         goto out;
 200                 }
 201         }
 202
 203         if (!c->set_config_item(c, "lxc.init.cmd", "you-shall-fail")) {
 204                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 205                 goto out;
 206         }
 207
 208         if (!c->set_config_item(c, "lxc.execute.cmd", "you-shall-fail")) {
 209                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 210                 goto out;
 211         }
 212
 213         /* Test whether we can start a really short-lived daemonized container. */
 214         for (i = 0; i < 10; i++) {
 215                 if (c->startl(c, 0, NULL)) {
 216                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 217                         goto out;
 218                 }
 219
 220                 if (!c->wait(c, "STOPPED", 30)) {
 221                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 222                         goto out;
 223                 }
 224         }
 225
 226         /* Test whether we can start a really short-lived daemonized container with lxc-init. */
 227         for (i = 0; i < 10; i++) {
 228                 /* An container started with lxc-init will always start
 229                  * succesfully unless lxc-init has a bug.
 230                  */
 231                 if (!c->startl(c, 1, NULL)) {
 232                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 233                         goto out;
 234                 }
 235
 236                 if (!c->wait(c, "STOPPED", 30)) {
 237                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 238                         goto out;
 239                 }
 240         }
 241
 242         c->stop(c);
 243
 244         fprintf(stderr, "all lxc_container tests passed for %s\n", c->name);
 245         ret = 0;
 246
 247 out:
 248         if (c) {
 249                 c->stop(c);
 250                 destroy_container();
 251         }
 252         lxc_container_put(c);
 253
 254         if (ret != 0) {
 255                 fd = open(template, O_RDONLY);
 256                 if (fd >= 0) {
 257                         char buf[4096];
 258                         ssize_t buflen;
 259                         while ((buflen = read(fd, buf, 1024)) > 0) {
 260                                 buflen = write(STDERR_FILENO, buf, buflen);
 261                                 if (buflen <= 0)
 262                                         break;
 263                         }
 264                         close(fd);
 265                 }
 266         }
 267
 268         unlink(template);
 269         exit(ret);
 270 }