lxc_destroy.c revision 5a21336025eec5b4228994d0efece129257411bd
/*
*
* Copyright © 2013 Serge Hallyn <serge.hallyn@ubuntu.com>.
* Copyright © 2013 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.
*/
#define _GNU_SOURCE
#include "config.h"
#include <libgen.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <lxc/lxccontainer.h>
#include "arguments.h"
#include "log.h"
#include "lxc.h"
#include "utils.h"
lxc_log_define(lxc_destroy_ui, lxc);
static int my_parser(struct lxc_arguments* args, int c, char* arg);
static bool quiet;
static const struct option my_longopts[] = {
{"force", no_argument, 0, 'f'},
{"snapshots", no_argument, 0, 's'},
LXC_COMMON_OPTIONS
};
static struct lxc_arguments my_args = {
.progname = "lxc-destroy",
.help = "\
--name=NAME [-f] [-P lxcpath]\n\
\n\
lxc-destroy destroys a container with the identifier NAME\n\
\n\
Options :\n\
-n, --name=NAME NAME of the container\n\
-s, --snapshots destroy including all snapshots\n\
-f, --force wait for the container to shut down\n",
.options = my_longopts,
.parser = my_parser,
.checker = NULL,
.task = DESTROY,
};
static bool do_destroy(struct lxc_container *c);
static bool do_destroy_with_snapshots(struct lxc_container *c);
int main(int argc, char *argv[])
{
struct lxc_container *c;
bool bret;
if (lxc_arguments_parse(&my_args, argc, argv))
exit(EXIT_FAILURE);
if (!my_args.log_file)
my_args.log_file = "none";
if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
my_args.progname, my_args.quiet, my_args.lxcpath[0]))
exit(EXIT_FAILURE);
lxc_log_options_no_override();
if (my_args.quiet)
quiet = true;
c = lxc_container_new(my_args.name, my_args.lxcpath[0]);
if (!c) {
if (!quiet)
fprintf(stderr, "System error loading container\n");
exit(EXIT_FAILURE);
}
if (!c->may_control(c)) {
if (!quiet)
fprintf(stderr, "Insufficent privileges to control %s\n", my_args.name);
lxc_container_put(c);
exit(EXIT_FAILURE);
}
if (!c->is_defined(c)) {
if (!quiet)
fprintf(stderr, "Container is not defined\n");
lxc_container_put(c);
exit(EXIT_FAILURE);
}
if (my_args.task == SNAP) {
bret = do_destroy_with_snapshots(c);
if (bret && !quiet)
printf("Destroyed container %s including snapshots \n", my_args.name);
} else {
bret = do_destroy(c);
if (bret && !quiet)
printf("Destroyed container %s\n", my_args.name);
}
lxc_container_put(c);
if (bret)
exit(EXIT_SUCCESS);
exit(EXIT_FAILURE);
}
static int my_parser(struct lxc_arguments *args, int c, char *arg)
{
switch (c) {
case 'f': args->force = 1; break;
case 's': args->task = SNAP; break;
}
return 0;
}
static bool do_destroy(struct lxc_container *c)
{
bool bret = true;
char path[MAXPATHLEN];
/* First check whether the container has dependent clones or snapshots. */
int ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, c->name);
if (ret < 0 || ret >= MAXPATHLEN)
return false;
if (file_exists(path)) {
if (!quiet)
fprintf(stdout, "Destroying %s failed: %s has clones.\n", c->name, c->name);
return false;
}
ret = snprintf(path, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name);
if (ret < 0 || ret >= MAXPATHLEN)
return false;
if (dir_exists(path)) {
if (!quiet)
fprintf(stdout, "Destroying %s failed: %s has snapshots.\n", c->name, c->name);
return false;
}
if (c->is_running(c)) {
if (!my_args.force && !quiet) {
fprintf(stderr, "%s is running\n", my_args.name);
return false;
}
/* If the container was ephemeral it will be removed on shutdown. */
c->stop(c);
}
/* If the container was ephemeral we have already removed it when we
* stopped it. */
if (c->is_defined(c) && !c->lxc_conf->ephemeral)
bret = c->destroy(c);
if (!bret) {
if (!quiet)
fprintf(stderr, "Destroying %s failed\n", my_args.name);
return false;
}
return true;
}
static bool do_destroy_with_snapshots(struct lxc_container *c)
{
struct lxc_container *c1;
struct stat fbuf;
bool bret = false;
char path[MAXPATHLEN];
char *buf = NULL;
char *lxcpath = NULL;
char *lxcname = NULL;
char *scratch = NULL;
int fd;
int ret;
int counter = 0;
/* Destroy clones. */
ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, c->name);
if (ret < 0 || ret >= MAXPATHLEN)
return false;
fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd >= 0) {
ret = fstat(fd, &fbuf);
if (ret < 0) {
close(fd);
return false;
}
/* Make sure that the string is \0 terminated. */
buf = calloc(fbuf.st_size + 1, sizeof(char));
if (!buf) {
SYSERROR("failed to allocate memory");
close(fd);
return false;
}
ret = read(fd, buf, fbuf.st_size);
if (ret < 0) {
ERROR("could not read %s", path);
close(fd);
free(buf);
return false;
}
close(fd);
while ((lxcpath = strtok_r(!counter ? buf : NULL, "\n", &scratch))) {
if (!(lxcname = strtok_r(NULL, "\n", &scratch)))
break;
c1 = lxc_container_new(lxcname, lxcpath);
if (!c1) {
counter++;
continue;
}
/* We do not destroy recursively. If a clone of a clone
* has clones or snapshots the user should remove it
* explicitly. */
if (!do_destroy(c1)) {
lxc_container_put(c1);
free(buf);
return false;
}
lxc_container_put(c1);
counter++;
}
free(buf);
}
/* Destroy snapshots located in the containers snap/ folder. */
ret = snprintf(path, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name);
if (ret < 0 || ret >= MAXPATHLEN)
return false;
if (dir_exists(path))
bret = c->destroy_with_snapshots(c);
else
bret = do_destroy(c);
return bret;
}