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 #define MYNAME "shortlived"
  35
  36 static int destroy_container(void)
  37 {
  38         int status, ret;
  39         pid_t pid = fork();
  40
  41         if (pid < 0) {
  42                 perror("fork");
  43                 return -1;
  44         }
  45         if (pid == 0) {
  46                 execlp("lxc-destroy", "lxc-destroy", "-f", "-n", MYNAME, NULL);
  47                 exit(EXIT_FAILURE);
  48         }
  49 again:
  50         ret = waitpid(pid, &status, 0);
  51         if (ret == -1) {
  52                 if (errno == EINTR)
  53                         goto again;
  54                 perror("waitpid");
  55                 return -1;
  56         }
  57         if (ret != pid)
  58                 goto again;
  59         if (!WIFEXITED(status))  { // did not exit normally
  60                 fprintf(stderr, "%d: lxc-create exited abnormally\n", __LINE__);
  61                 return -1;
  62         }
  63         return WEXITSTATUS(status);
  64 }
  65
  66 static int create_container(void)
  67 {
  68         int status, ret;
  69         pid_t pid = fork();
  70
  71         if (pid < 0) {
  72                 perror("fork");
  73                 return -1;
  74         }
  75         if (pid == 0) {
  76                 execlp("lxc-create", "lxc-create", "-t", "busybox", "-n", MYNAME, NULL);
  77                 exit(EXIT_FAILURE);
  78         }
  79 again:
  80         ret = waitpid(pid, &status, 0);
  81         if (ret == -1) {
  82                 if (errno == EINTR)
  83                         goto again;
  84                 perror("waitpid");
  85                 return -1;
  86         }
  87         if (ret != pid)
  88                 goto again;
  89         if (!WIFEXITED(status))  { // did not exit normally
  90                 fprintf(stderr, "%d: lxc-create exited abnormally\n", __LINE__);
  91                 return -1;
  92         }
  93         return WEXITSTATUS(status);
  94 }
  95
  96 int main(int argc, char *argv[])
  97 {
  98         int fd, i;
  99         const char *s;
 100         bool b;
 101         struct lxc_container *c;
 102         struct lxc_log log;
 103         char template[sizeof(P_tmpdir"/shortlived_XXXXXX")];
 104         int ret = EXIT_FAILURE;
 105
 106         strcpy(template, P_tmpdir"/shortlived_XXXXXX");
 107         i = lxc_make_tmpfile(template, false);
 108         if (i < 0) {
 109                 lxc_error("Failed to create temporary log file for container %s\n", MYNAME);
 110                 exit(EXIT_FAILURE);
 111         } else {
 112                 lxc_debug("Using \"%s\" as temporary log file for container %s\n", template, MYNAME);
 113                 close(i);
 114         }
 115
 116         log.name = MYNAME;
 117         log.file = template;
 118         log.level = "TRACE";
 119         log.prefix = "shortlived";
 120         log.quiet = false;
 121         log.lxcpath = NULL;
 122         if (lxc_log_init(&log))
 123                 exit(EXIT_FAILURE);
 124
 125         /* test a real container */
 126         c = lxc_container_new(MYNAME, NULL);
 127         if (!c) {
 128                 fprintf(stderr, "%d: error creating lxc_container %s\n", __LINE__, MYNAME);
 129                 goto out;
 130         }
 131
 132         if (c->is_defined(c)) {
 133                 fprintf(stderr, "%d: %s thought it was defined\n", __LINE__, MYNAME);
 134                 goto out;
 135         }
 136
 137         if (create_container() < 0) {
 138                 fprintf(stderr, "%d: failed to create a container\n", __LINE__);
 139                 goto out;
 140         }
 141
 142         b = c->is_defined(c);
 143         if (!b) {
 144                 fprintf(stderr, "%d: %s thought it was not defined\n", __LINE__, MYNAME);
 145                 goto out;
 146         }
 147
 148         s = c->state(c);
 149         if (!s || strcmp(s, "STOPPED")) {
 150                 fprintf(stderr, "%d: %s is in state %s, not in STOPPED.\n", __LINE__, c->name, s ? s : "undefined");
 151                 goto out;
 152         }
 153
 154         b = c->load_config(c, NULL);
 155         if (!b) {
 156                 fprintf(stderr, "%d: %s failed to read its config\n", __LINE__, c->name);
 157                 goto out;
 158         }
 159
 160         if (!c->set_config_item(c, "lxc.init.cmd", "echo hello")) {
 161                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 162                 goto out;
 163         }
 164
 165         if (!c->set_config_item(c, "lxc.execute.cmd", "echo hello")) {
 166                 fprintf(stderr, "%d: failed setting lxc.execute.cmd\n", __LINE__);
 167                 goto out;
 168         }
 169
 170         c->want_daemonize(c, true);
 171
 172         /* Test whether we can start a really short-lived daemonized container. */
 173         for (i = 0; i < 10; i++) {
 174                 if (!c->startl(c, 0, NULL)) {
 175                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 176                         goto out;
 177                 }
 178
 179                 if (!c->wait(c, "STOPPED", 30)) {
 180                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 181                         goto out;
 182                 }
 183         }
 184
 185         /* Test whether we can start a really short-lived daemonized container with lxc-init. */
 186         for (i = 0; i < 10; i++) {
 187                 if (!c->startl(c, 1, NULL)) {
 188                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 189                         goto out;
 190                 }
 191
 192                 if (!c->wait(c, "STOPPED", 30)) {
 193                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 194                         goto out;
 195                 }
 196         }
 197
 198         if (!c->set_config_item(c, "lxc.init.cmd", "you-shall-fail")) {
 199                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 200                 goto out;
 201         }
 202
 203         if (!c->set_config_item(c, "lxc.execute.cmd", "you-shall-fail")) {
 204                 fprintf(stderr, "%d: failed setting lxc.init.cmd\n", __LINE__);
 205                 goto out;
 206         }
 207
 208         /* Test whether we can start a really short-lived daemonized container. */
 209         for (i = 0; i < 10; i++) {
 210                 if (c->startl(c, 0, NULL)) {
 211                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 212                         goto out;
 213                 }
 214
 215                 if (!c->wait(c, "STOPPED", 30)) {
 216                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 217                         goto out;
 218                 }
 219         }
 220
 221         /* Test whether we can start a really short-lived daemonized container with lxc-init. */
 222         for (i = 0; i < 10; i++) {
 223                 /* An container started with lxc-init will always start
 224                  * succesfully unless lxc-init has a bug.
 225                  */
 226                 if (!c->startl(c, 1, NULL)) {
 227                         fprintf(stderr, "%d: %s failed to start on %dth iteration\n", __LINE__, c->name, i);
 228                         goto out;
 229                 }
 230
 231                 if (!c->wait(c, "STOPPED", 30)) {
 232                         fprintf(stderr, "%d: %s failed to wait on %dth iteration\n", __LINE__, c->name, i);
 233                         goto out;
 234                 }
 235         }
 236
 237         c->stop(c);
 238
 239         fprintf(stderr, "all lxc_container tests passed for %s\n", c->name);
 240         ret = 0;
 241
 242 out:
 243         if (c) {
 244                 c->stop(c);
 245                 destroy_container();
 246         }
 247         lxc_container_put(c);
 248
 249         if (ret != 0) {
 250                 fd = open(template, O_RDONLY);
 251                 if (fd >= 0) {
 252                         char buf[4096];
 253                         ssize_t buflen;
 254                         while ((buflen = read(fd, buf, 1024)) > 0) {
 255                                 buflen = write(STDERR_FILENO, buf, buflen);
 256                                 if (buflen <= 0)
 257                                         break;
 258                         }
 259                         close(fd);
 260                 }
 261         }
 262
 263         unlink(template);
 264         exit(ret);
 265 }