#include "monitor.h"
#include "namespace.h"
#include "lxclock.h"
+#include "sync.h"
#if HAVE_IFADDRS_H
#include <ifaddrs.h>
lxc_log_define(lxc_container, lxc);
-static bool file_exists(const char *f)
-{
- struct stat statbuf;
-
- return stat(f, &statbuf) == 0;
-}
-
static bool config_file_exists(const char *lxcpath, const char *cname)
{
/* $lxcpath + '/' + $cname + '/config' + \0 */
{
if (!c->lxc_conf)
c->lxc_conf = lxc_conf_init();
- if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf))
- return true;
- return false;
+ if (!c->lxc_conf)
+ return false;
+ if (lxc_config_read(fname, c->lxc_conf, false) != 0)
+ return false;
+ if (!clone_update_unexp_network(c->lxc_conf))
+ return false;
+ return true;
}
static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file)
FILE *pid_fp = NULL;
char *default_args[] = {
"/sbin/init",
- '\0',
+ NULL,
};
/* container exists */
SYSERROR("Error chdir()ing to /.");
return false;
}
+ lxc_check_inherited(conf, -1);
close(0);
close(1);
close(2);
reboot:
conf->reboot = 0;
ret = lxc_start(c->name, argv, conf, c->config_path);
+ c->error_num = ret;
if (conf->reboot) {
INFO("container requested reboot");
return ret == 0;
}
+static int do_create_container_dir(const char *path, struct lxc_conf *conf)
+{
+ int ret = -1, lasterr;
+ char *p = alloca(strlen(path)+1);
+ mode_t mask = umask(0002);
+ ret = mkdir(path, 0770);
+ lasterr = errno;
+ umask(mask);
+ errno = lasterr;
+ if (ret) {
+ if (errno == EEXIST)
+ ret = 0;
+ else {
+ SYSERROR("failed to create container path %s", path);
+ return -1;
+ }
+ }
+ strcpy(p, path);
+ if (!lxc_list_empty(&conf->id_map) && chown_mapped_root(p, conf) != 0) {
+ ERROR("Failed to chown container dir");
+ ret = -1;
+ }
+ return ret;
+}
+
/*
* create the standard expected container dir
*/
free(s);
return false;
}
- ret = mkdir(s, 0755);
- if (ret) {
- if (errno == EEXIST)
- ret = 0;
- else
- SYSERROR("failed to create container path for %s", c->name);
- }
+ ret = do_create_container_dir(s, c->lxc_conf);
free(s);
return ret == 0;
}
/* if we are not root, chown the rootfs dir to root in the
* target uidmap */
- if (geteuid() != 0) {
+ if (geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) {
if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) {
ERROR("Error chowning %s to container root", bdev->dest);
+ suggest_default_idmap();
bdev_put(bdev);
return NULL;
}
if (strncmp(src, "aufs:", 5) == 0)
src = overlay_getlower(src+5);
- bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL);
+ bdev = bdev_init(c->lxc_conf, src, c->lxc_conf->rootfs.mount, NULL);
if (!bdev) {
ERROR("Error opening rootfs");
exit(1);
exit(1);
}
if (detect_shared_rootfs()) {
- if (mount("", "", NULL, MS_SLAVE|MS_REC, 0)) {
+ if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) {
SYSERROR("Failed to make / rslave to run template");
ERROR("Continuing...");
}
}
}
- if (strcmp(bdev->type, "dir") != 0) {
+ if (strcmp(bdev->type, "dir") && strcmp(bdev->type, "btrfs")) {
if (geteuid() != 0) {
- ERROR("non-root users can only create directory-backed containers");
+ ERROR("non-root users can only create btrfs and directory-backed containers");
exit(1);
}
if (bdev->ops->mount(bdev) < 0) {
* and we append "--mapped-uid x", where x is the mapped uid
* for our geteuid()
*/
- if (geteuid() != 0 && !lxc_list_empty(&conf->id_map)) {
+ if (!lxc_list_empty(&conf->id_map)) {
int n2args = 1;
char txtuid[20];
char txtgid[20];
fprintf(f, "%02x", md_value[i]);
fprintf(f, "\n");
#endif
- fprintf(f, "# For additional config options, please look at lxc.conf(5)\n");
+ fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n");
if (fwrite(contents, 1, flen, f) != flen) {
SYSERROR("Writing original contents");
free(contents);
static void lxcapi_clear_config(struct lxc_container *c)
{
- if (c && c->lxc_conf) {
- lxc_conf_free(c->lxc_conf);
- c->lxc_conf = NULL;
+ if (c) {
+ if (c->lxc_conf) {
+ lxc_conf_free(c->lxc_conf);
+ c->lxc_conf = NULL;
+ }
}
}
static bool lxcapi_destroy(struct lxc_container *c);
+static bool container_destroy(struct lxc_container *c);
+static bool get_snappath_dir(struct lxc_container *c, char *snappath);
/*
* lxcapi_create:
* create a container with the given parameters.
remove_partial(c, partial_fd);
out:
if (!ret && c)
- lxcapi_destroy(c);
+ container_destroy(c);
free_tpath:
if (tpath)
free(tpath);
return bret;
}
+static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key)
+{
+ if (strcmp(key, "lxc.cgroup") == 0)
+ clear_unexp_config_line(conf, key, true);
+ else if (strcmp(key, "lxc.network") == 0)
+ clear_unexp_config_line(conf, key, true);
+ else if (strcmp(key, "lxc.hook") == 0)
+ clear_unexp_config_line(conf, key, true);
+ else
+ clear_unexp_config_line(conf, key, false);
+ if (!do_append_unexp_config_line(conf, key, ""))
+ WARN("Error clearing configuration for %s", key);
+}
+
static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key)
{
int ret;
if (container_mem_lock(c))
return false;
ret = lxc_clear_config_item(c->lxc_conf, key);
+ if (!ret)
+ do_clear_unexp_config_line(c->lxc_conf, key);
container_mem_unlock(c);
return ret == 0;
}
init_pid = c->init_pid(c);
/* Switch to new userns */
- if (geteuid() && access("/proc/self/ns/user", F_OK) == 0) {
+ if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) {
ret = snprintf(new_userns_path, MAXPATHLEN, "/proc/%d/ns/user", init_pid);
if (ret < 0 || ret >= MAXPATHLEN)
goto out;
fclose(f);
}
-static bool has_snapshots(struct lxc_container *c)
+static bool has_fs_snapshots(struct lxc_container *c)
{
char path[MAXPATHLEN];
int ret, v;
return bret;
}
+static bool has_snapshots(struct lxc_container *c)
+{
+ char path[MAXPATHLEN];
+ struct dirent dirent, *direntp;
+ int count=0;
+ DIR *dir;
+
+ if (!get_snappath_dir(c, path))
+ return false;
+ dir = opendir(path);
+ if (!dir)
+ return false;
+ while (!readdir_r(dir, &dirent, &direntp)) {
+ if (!direntp)
+ break;
+
+ if (!strcmp(direntp->d_name, "."))
+ continue;
+
+ if (!strcmp(direntp->d_name, ".."))
+ continue;
+ count++;
+ break;
+ }
+ closedir(dir);
+ return count > 0;
+}
+
static int lxc_rmdir_onedev_wrapper(void *data)
{
char *arg = (char *) data;
- return lxc_rmdir_onedev(arg);
+ return lxc_rmdir_onedev(arg, "snaps");
}
-// do we want the api to support --force, or leave that to the caller?
-static bool lxcapi_destroy(struct lxc_container *c)
+static int do_bdev_destroy(struct lxc_conf *conf)
+{
+ struct bdev *r;
+ int ret = 0;
+
+ r = bdev_init(conf, conf->rootfs.path, conf->rootfs.mount, NULL);
+ if (!r)
+ return -1;
+
+ if (r->ops->destroy(r) < 0)
+ ret = -1;
+ bdev_put(r);
+ return ret;
+}
+
+static int bdev_destroy_wrapper(void *data)
+{
+ struct lxc_conf *conf = data;
+
+ if (setgid(0) < 0) {
+ ERROR("Failed to setgid to 0");
+ return -1;
+ }
+ if (setgroups(0, NULL) < 0)
+ WARN("Failed to clear groups");
+ if (setuid(0) < 0) {
+ ERROR("Failed to setuid to 0");
+ return -1;
+ }
+ return do_bdev_destroy(conf);
+}
+
+static bool container_destroy(struct lxc_container *c)
{
- struct bdev *r = NULL;
bool bret = false;
int ret;
goto out;
}
- if (c->lxc_conf && has_snapshots(c)) {
- ERROR("container %s has dependent snapshots", c->name);
- goto out;
- }
-
- if (!am_unpriv() && c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) {
- r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
- if (r) {
- if (r->ops->destroy(r) < 0) {
- bdev_put(r);
- ERROR("Error destroying rootfs for %s", c->name);
- goto out;
- }
- bdev_put(r);
+ if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) {
+ if (am_unpriv())
+ ret = userns_exec_1(c->lxc_conf, bdev_destroy_wrapper, c->lxc_conf);
+ else
+ ret = do_bdev_destroy(c->lxc_conf);
+ if (ret < 0) {
+ ERROR("Error destroying rootfs for %s", c->name);
+ goto out;
}
}
if (am_unpriv())
ret = userns_exec_1(c->lxc_conf, lxc_rmdir_onedev_wrapper, path);
else
- ret = lxc_rmdir_onedev(path);
+ ret = lxc_rmdir_onedev(path, "snaps");
if (ret < 0) {
ERROR("Error destroying container directory for %s", c->name);
goto out;
return bret;
}
+static bool lxcapi_destroy(struct lxc_container *c)
+{
+ if (!c || !lxcapi_is_defined(c))
+ return false;
+ if (has_snapshots(c)) {
+ ERROR("Container %s has snapshots; not removing", c->name);
+ return false;
+ }
+
+ if (has_fs_snapshots(c)) {
+ ERROR("container %s has snapshots on its rootfs", c->name);
+ return false;
+ }
+
+ return container_destroy(c);
+}
+
+static bool lxcapi_snapshot_destroy_all(struct lxc_container *c);
+
+static bool lxcapi_destroy_with_snapshots(struct lxc_container *c)
+{
+ if (!c || !lxcapi_is_defined(c))
+ return false;
+ if (!lxcapi_snapshot_destroy_all(c)) {
+ ERROR("Error deleting all snapshots");
+ return false;
+ }
+ return lxcapi_destroy(c);
+}
+
static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v)
{
struct lxc_config_t *config;
config = lxc_getconfig(key);
if (!config)
return false;
- return (0 == config->cb(key, v, c->lxc_conf));
+ if (config->cb(key, v, c->lxc_conf) != 0)
+ return false;
+ return do_append_unexp_config_line(c->lxc_conf, key, v);
}
static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v)
}
}
+ if (!clone_update_unexp_hooks(c->lxc_conf)) {
+ ERROR("Error saving new hooks in clone");
+ return -1;
+ }
c->save_config(c, NULL);
return 0;
}
if (!oldpath)
return 0;
+ clear_unexp_config_line(c->lxc_conf, "lxc.mount", false);
+
char *p = strrchr(oldpath, '/');
if (!p)
return -1;
ERROR("error: allocating pathname");
return -1;
}
+ if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount", newpath)) {
+ ERROR("error saving new lxctab");
+ return -1;
+ }
return 0;
}
ERROR("Out of memory while setting storage path");
return -1;
}
+ // We will simply append a new lxc.rootfs entry to the unexpanded config
+ clear_unexp_config_line(c->lxc_conf, "lxc.rootfs", false);
+ if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs", c->lxc_conf->rootfs.path)) {
+ ERROR("Error saving new rootfs to cloend config");
+ return -1;
+ }
if (flags & LXC_CLONE_SNAPSHOT)
copy_rdepends(c, c0);
if (need_rdep) {
if (unshare(CLONE_NEWNS) < 0)
return -1;
- bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
+ bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
if (!bdev)
return -1;
if (strcmp(bdev->type, "dir") != 0) {
if (unshare(CLONE_NEWNS) < 0) {
ERROR("error unsharing mounts");
+ bdev_put(bdev);
return -1;
}
- if (bdev->ops->mount(bdev) < 0)
+ if (detect_shared_rootfs()) {
+ if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) {
+ SYSERROR("Failed to make / rslave");
+ ERROR("Continuing...");
+ }
+ }
+ if (bdev->ops->mount(bdev) < 0) {
+ bdev_put(bdev);
return -1;
+ }
} else { // TODO come up with a better way
if (bdev->dest)
free(bdev->dest);
if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) {
ERROR("Error executing clone hook for %s", c->name);
+ bdev_put(bdev);
return -1;
}
}
if (!(flags & LXC_CLONE_KEEPNAME)) {
ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest);
+ bdev_put(bdev);
+
if (ret < 0 || ret >= MAXPATHLEN)
return -1;
if (!file_exists(path))
if (fclose(fout) < 0)
return -1;
}
+ else
+ bdev_put(bdev);
+
return 0;
}
only rootfs gets converted (copied/snapshotted) on clone.
*/
-static int create_file_dirname(char *path)
+static int create_file_dirname(char *path, struct lxc_conf *conf)
{
char *p = strrchr(path, '/');
- int ret;
+ int ret = -1;
if (!p)
return -1;
*p = '\0';
- ret = mkdir(path, 0755);
- if (ret && errno != EEXIST)
- SYSERROR("creating container path %s", path);
+ ret = do_create_container_dir(path, conf);
*p = '/';
return ret;
}
struct lxc_container *c2 = NULL;
char newpath[MAXPATHLEN];
int ret, storage_copied = 0;
- const char *n, *l;
+ char *origroot = NULL;
struct clone_update_data data;
FILE *fout;
pid_t pid;
}
// Make sure the container doesn't yet exist.
- n = newname ? newname : c->name;
- l = lxcpath ? lxcpath : c->get_config_path(c);
- ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n);
+ if (!newname)
+ newname = c->name;
+ if (!lxcpath)
+ lxcpath = c->get_config_path(c);
+ ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname);
if (ret < 0 || ret >= MAXPATHLEN) {
SYSERROR("clone: failed making config pathname");
goto out;
goto out;
}
- ret = create_file_dirname(newpath);
+ ret = create_file_dirname(newpath, c->lxc_conf);
if (ret < 0 && errno != EEXIST) {
ERROR("Error creating container dir for %s", newpath);
goto out;
}
// copy the configuration, tweak it as needed,
+ if (c->lxc_conf->rootfs.path) {
+ origroot = c->lxc_conf->rootfs.path;
+ c->lxc_conf->rootfs.path = NULL;
+ }
fout = fopen(newpath, "w");
if (!fout) {
SYSERROR("open %s", newpath);
}
write_config(fout, c->lxc_conf);
fclose(fout);
+ c->lxc_conf->rootfs.path = origroot;
- sprintf(newpath, "%s/%s/rootfs", l, n);
+ sprintf(newpath, "%s/%s/rootfs", lxcpath, newname);
if (mkdir(newpath, 0755) < 0) {
SYSERROR("error creating %s", newpath);
goto out;
}
}
- c2 = lxc_container_new(n, l);
+ c2 = lxc_container_new(newname, lxcpath);
if (!c2) {
- ERROR("clone: failed to create new container (%s %s)", n, l);
+ ERROR("clone: failed to create new container (%s %s)", newname,
+ lxcpath);
goto out;
}
+ // copy/snapshot rootfs's
+ ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize);
+ if (ret < 0)
+ goto out;
+
+ clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false);
+
// update utsname
if (!set_config_item_locked(c2, "lxc.utsname", newname)) {
ERROR("Error setting new hostname");
}
// update macaddrs
- if (!(flags & LXC_CLONE_KEEPMACADDR))
+ if (!(flags & LXC_CLONE_KEEPMACADDR)) {
network_new_hwaddrs(c2);
-
- // copy/snapshot rootfs's
- ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize);
- if (ret < 0)
- goto out;
+ if (!clone_update_unexp_network(c2->lxc_conf)) {
+ ERROR("Error updating network for clone");
+ goto out;
+ }
+ }
// We've now successfully created c2's storage, so clear it out if we
// fail after this
struct bdev *bdev;
struct lxc_container *newc;
- if (!c || !c->name || !c->config_path)
+ if (!c || !c->name || !c->config_path || !c->lxc_conf)
return false;
- bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
+ if (has_fs_snapshots(c) || has_snapshots(c)) {
+ ERROR("Renaming a container with snapshots is not supported");
+ return false;
+ }
+ bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
if (!bdev) {
ERROR("Failed to find original backing store type");
return false;
if (newc && lxcapi_is_defined(newc))
lxc_container_put(newc);
- if (!lxcapi_destroy(c)) {
+ if (!container_destroy(c)) {
ERROR("Could not destroy existing container %s", c->name);
return false;
}
}
}
+static bool get_snappath_dir(struct lxc_container *c, char *snappath)
+{
+ int ret;
+ /*
+ * If the old style snapshot path exists, use it
+ * /var/lib/lxc -> /var/lib/lxcsnaps
+ */
+ ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path);
+ if (ret < 0 || ret >= MAXPATHLEN)
+ return false;
+ if (dir_exists(snappath)) {
+ ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
+ if (ret < 0 || ret >= MAXPATHLEN)
+ return false;
+ return true;
+ }
+
+ /*
+ * Use the new style path
+ * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
+ */
+ ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name);
+ if (ret < 0 || ret >= MAXPATHLEN)
+ return false;
+ return true;
+}
+
static int lxcapi_snapshot(struct lxc_container *c, const char *commentfile)
{
int i, flags, ret;
struct lxc_container *c2;
char snappath[MAXPATHLEN], newname[20];
- // /var/lib/lxc -> /var/lib/lxcsnaps \0
- ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
- if (ret < 0 || ret >= MAXPATHLEN)
+ if (!c || !lxcapi_is_defined(c))
+ return -1;
+
+ if (!bdev_can_backup(c->lxc_conf)) {
+ ERROR("%s's backing store cannot be backed up.", c->name);
+ ERROR("Your container must use another backing store type.");
+ return -1;
+ }
+
+ if (!get_snappath_dir(c, snappath))
return -1;
+
i = get_next_index(snappath, c->name);
if (mkdir_p(snappath, 0755) < 0) {
*/
flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME |
LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT;
- if (bdev_is_dir(c->lxc_conf->rootfs.path)) {
+ if (bdev_is_dir(c->lxc_conf, c->lxc_conf->rootfs.path)) {
ERROR("Snapshot of directory-backed container requested.");
ERROR("Making a copy-clone. If you do want snapshots, then");
ERROR("please create an aufs or overlayfs clone first, snapshot that");
static int lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps)
{
char snappath[MAXPATHLEN], path2[MAXPATHLEN];
- int dirlen, count = 0, ret;
+ int count = 0, ret;
struct dirent dirent, *direntp;
struct lxc_snapshot *snaps =NULL, *nsnaps;
DIR *dir;
if (!c || !lxcapi_is_defined(c))
return -1;
- // snappath is ${lxcpath}snaps/${lxcname}/
- dirlen = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
- if (dirlen < 0 || dirlen >= MAXPATHLEN) {
+ if (!get_snappath_dir(c, snappath)) {
ERROR("path name too long");
return -1;
}
static bool lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname)
{
char clonelxcpath[MAXPATHLEN];
- int ret;
+ int flags = 0;
struct lxc_container *snap, *rest;
struct bdev *bdev;
bool b = false;
if (!c || !c->name || !c->config_path)
return false;
- bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
+ if (has_fs_snapshots(c)) {
+ ERROR("container rootfs has dependent snapshots");
+ return false;
+ }
+
+ bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
if (!bdev) {
ERROR("Failed to find original backing store type");
return false;
if (!newname)
newname = c->name;
- if (strcmp(c->name, newname) == 0) {
- if (!lxcapi_destroy(c)) {
- ERROR("Could not destroy existing container %s", newname);
- bdev_put(bdev);
- return false;
- }
- }
- ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
- if (ret < 0 || ret >= MAXPATHLEN) {
+
+ if (!get_snappath_dir(c, clonelxcpath)) {
bdev_put(bdev);
return false;
}
return false;
}
- rest = lxcapi_clone(snap, newname, c->config_path, 0, bdev->type, NULL, 0, NULL);
+ if (strcmp(c->name, newname) == 0) {
+ if (!container_destroy(c)) {
+ ERROR("Could not destroy existing container %s", newname);
+ lxc_container_put(snap);
+ bdev_put(bdev);
+ return false;
+ }
+ }
+
+ if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0)
+ flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT;
+ rest = lxcapi_clone(snap, newname, c->config_path, flags,
+ bdev->type, NULL, 0, NULL);
bdev_put(bdev);
if (rest && lxcapi_is_defined(rest))
b = true;
return b;
}
-static bool lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname)
+static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath)
{
- int ret;
- char clonelxcpath[MAXPATHLEN];
struct lxc_container *snap = NULL;
-
- if (!c || !c->name || !c->config_path)
- return false;
-
- ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
- if (ret < 0 || ret >= MAXPATHLEN)
- goto err;
+ bool bret = false;
snap = lxc_container_new(snapname, clonelxcpath);
- if (!snap || !lxcapi_is_defined(snap)) {
+ if (!snap) {
ERROR("Could not find snapshot %s", snapname);
goto err;
}
ERROR("Could not destroy snapshot %s", snapname);
goto err;
}
- lxc_container_put(snap);
+ bret = true;
- return true;
err:
if (snap)
lxc_container_put(snap);
- return false;
+ return bret;
+}
+
+static bool remove_all_snapshots(const char *path)
+{
+ DIR *dir;
+ struct dirent dirent, *direntp;
+ bool bret = true;
+
+ dir = opendir(path);
+ if (!dir) {
+ SYSERROR("opendir on snapshot path %s", path);
+ return false;
+ }
+ while (!readdir_r(dir, &dirent, &direntp)) {
+ if (!direntp)
+ break;
+ if (!strcmp(direntp->d_name, "."))
+ continue;
+ if (!strcmp(direntp->d_name, ".."))
+ continue;
+ if (!do_snapshot_destroy(direntp->d_name, path)) {
+ bret = false;
+ continue;
+ }
+ }
+
+ closedir(dir);
+
+ if (rmdir(path))
+ SYSERROR("Error removing directory %s", path);
+
+ return bret;
+}
+
+static bool lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname)
+{
+ char clonelxcpath[MAXPATHLEN];
+
+ if (!c || !c->name || !c->config_path || !snapname)
+ return false;
+
+ if (!get_snappath_dir(c, clonelxcpath))
+ return false;
+
+ return do_snapshot_destroy(snapname, clonelxcpath);
+}
+
+static bool lxcapi_snapshot_destroy_all(struct lxc_container *c)
+{
+ char clonelxcpath[MAXPATHLEN];
+
+ if (!c || !c->name || !c->config_path)
+ return false;
+
+ if (!get_snappath_dir(c, clonelxcpath))
+ return false;
+
+ return remove_all_snapshots(clonelxcpath);
}
static bool lxcapi_may_control(struct lxc_container *c)
if (ret < 0 || ret >= MAXPATHLEN)
return false;
- if (chdir(chrootpath) < 0)
+ if (chroot(chrootpath) < 0)
exit(1);
- if (chroot(".") < 0)
+ if (chdir("/") < 0)
exit(1);
/* remove path if it exists */
if(faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW) == 0) {
return add_remove_device_node(c, src_path, dest_path, false);
}
+struct criu_opts {
+ /* The type of criu invocation, one of "dump" or "restore" */
+ char *action;
+
+ /* The directory to pass to criu */
+ char *directory;
+
+ /* The container to dump */
+ struct lxc_container *c;
+
+ /* Enable criu verbose mode? */
+ bool verbose;
+
+ /* dump: stop the container or not after dumping? */
+ bool stop;
+
+ /* restore: the file to write the init process' pid into */
+ char *pidfile;
+};
+
+/*
+ * @out must be 128 bytes long
+ */
+static int read_criu_file(const char *directory, const char *file, int netnr, char *out)
+{
+ char path[PATH_MAX];
+ int ret;
+ FILE *f;
+
+ ret = snprintf(path, PATH_MAX, "%s/%s%d", directory, file, netnr);
+ if (ret < 0 || ret >= PATH_MAX) {
+ ERROR("%s: path too long", __func__);
+ return -1;
+ }
+
+ f = fopen(path, "r");
+ if (!f)
+ return -1;
+
+ ret = fscanf(f, "%127s", out);
+ fclose(f);
+ if (ret <= 0)
+ return -1;
+
+ return 0;
+}
+
+static void exec_criu(struct criu_opts *opts)
+{
+ char **argv, log[PATH_MAX];
+ int static_args = 13, argc = 0, i, ret;
+
+ /* The command line always looks like:
+ * criu $(action) --tcp-established --file-locks --link-remap --manage-cgroups \
+ * --action-script foo.sh -D $(directory) -o $(directory)/$(action).log
+ * +1 for final NULL */
+
+ if (strcmp(opts->action, "dump") == 0) {
+ /* -t pid */
+ static_args += 2;
+
+ /* --leave-running */
+ if (!opts->stop)
+ static_args++;
+ } else if (strcmp(opts->action, "restore") == 0) {
+ /* --root $(lxc_mount_point) --restore-detached --pidfile $foo */
+ static_args += 5;
+ } else {
+ return;
+ }
+
+ if (opts->verbose)
+ static_args++;
+
+ ret = snprintf(log, PATH_MAX, "%s/%s.log", opts->directory, opts->action);
+ if (ret < 0 || ret >= PATH_MAX) {
+ ERROR("logfile name too long\n");
+ return;
+ }
+
+ argv = malloc(static_args * sizeof(*argv));
+ if (!argv)
+ return;
+
+ memset(argv, 0, static_args * sizeof(*argv));
+
+#define DECLARE_ARG(arg) \
+ do { \
+ argv[argc++] = strdup(arg); \
+ if (!argv[argc-1]) \
+ goto err; \
+ } while (0)
+
+ argv[argc++] = on_path("criu", NULL);
+ if (!argv[argc-1]) {
+ ERROR("Couldn't find criu binary\n");
+ goto err;
+ }
+
+ DECLARE_ARG(opts->action);
+ DECLARE_ARG("--tcp-established");
+ DECLARE_ARG("--file-locks");
+ DECLARE_ARG("--link-remap");
+ DECLARE_ARG("--manage-cgroups");
+ DECLARE_ARG("--action-script");
+ DECLARE_ARG(LIBEXECDIR "/lxc/lxc-restore-net");
+ DECLARE_ARG("-D");
+ DECLARE_ARG(opts->directory);
+ DECLARE_ARG("-o");
+ DECLARE_ARG(log);
+
+ if (opts->verbose)
+ DECLARE_ARG("-vvvvvv");
+
+ if (strcmp(opts->action, "dump") == 0) {
+ char pid[32];
+
+ if (sprintf(pid, "%d", lxcapi_init_pid(opts->c)) < 0)
+ goto err;
+
+ DECLARE_ARG("-t");
+ DECLARE_ARG(pid);
+ if (!opts->stop)
+ DECLARE_ARG("--leave-running");
+ } else if (strcmp(opts->action, "restore") == 0) {
+ int netnr = 0;
+ struct lxc_list *it;
+
+ DECLARE_ARG("--root");
+ DECLARE_ARG(opts->c->lxc_conf->rootfs.mount);
+ DECLARE_ARG("--restore-detached");
+ DECLARE_ARG("--pidfile");
+ DECLARE_ARG(opts->pidfile);
+
+ lxc_list_for_each(it, &opts->c->lxc_conf->network) {
+ char eth[128], veth[128], buf[257];
+ void *m;
+
+ if (read_criu_file(opts->directory, "veth", netnr, veth))
+ goto err;
+ if (read_criu_file(opts->directory, "eth", netnr, eth))
+ goto err;
+ ret = snprintf(buf, 257, "%s=%s", eth, veth);
+ if (ret < 0 || ret >= 257)
+ goto err;
+
+ /* final NULL and --veth-pair eth0:vethASDF */
+ m = realloc(argv, (argc + 1 + 2) * sizeof(*argv));
+ if (!m)
+ goto err;
+ argv = m;
+
+ DECLARE_ARG("--veth-pair");
+ DECLARE_ARG(buf);
+ argv[argc] = NULL;
+
+ netnr++;
+ }
+ }
+
+#undef DECLARE_ARG
+
+ execv(argv[0], argv);
+err:
+ for (i = 0; argv[i]; i++)
+ free(argv[i]);
+ free(argv);
+}
+
+/* Check and make sure the container has a configuration that we know CRIU can
+ * dump. */
+static bool criu_ok(struct lxc_container *c)
+{
+ struct lxc_list *it;
+ bool found_deny_rule = false;
+
+ if (geteuid()) {
+ ERROR("Must be root to checkpoint\n");
+ return false;
+ }
+
+ /* We only know how to restore containers with veth networks. */
+ lxc_list_for_each(it, &c->lxc_conf->network) {
+ struct lxc_netdev *n = it->elem;
+ if (n->type != LXC_NET_VETH && n->type != LXC_NET_NONE) {
+ ERROR("Found network that is not VETH or NONE\n");
+ return false;
+ }
+ }
+
+ // These requirements come from http://criu.org/LXC
+ if (c->lxc_conf->console.path &&
+ strcmp(c->lxc_conf->console.path, "none") != 0) {
+ ERROR("lxc.console must be none\n");
+ return false;
+ }
+
+ if (c->lxc_conf->tty != 0) {
+ ERROR("lxc.tty must be 0\n");
+ return false;
+ }
+
+ lxc_list_for_each(it, &c->lxc_conf->cgroup) {
+ struct lxc_cgroup *cg = it->elem;
+ if (strcmp(cg->subsystem, "devices.deny") == 0 &&
+ strcmp(cg->value, "c 5:1 rwm") == 0) {
+
+ found_deny_rule = true;
+ break;
+ }
+ }
+
+ if (!found_deny_rule) {
+ ERROR("couldn't find devices.deny = c 5:1 rwm");
+ return false;
+ }
+
+ return true;
+}
+
+static bool lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose)
+{
+ int netnr, status;
+ struct lxc_list *it;
+ bool error = false;
+ pid_t pid;
+
+ if (!criu_ok(c))
+ return false;
+
+ if (mkdir(directory, 0700) < 0 && errno != EEXIST)
+ return false;
+
+ netnr = 0;
+ lxc_list_for_each(it, &c->lxc_conf->network) {
+ char *veth = NULL, *bridge = NULL, veth_path[PATH_MAX], eth[128];
+ struct lxc_netdev *n = it->elem;
+ int pret;
+
+ pret = snprintf(veth_path, PATH_MAX, "lxc.network.%d.veth.pair", netnr);
+ if (pret < 0 || pret >= PATH_MAX) {
+ error = true;
+ goto out;
+ }
+
+ veth = lxcapi_get_running_config_item(c, veth_path);
+ if (!veth) {
+ /* criu_ok() checks that all interfaces are
+ * LXC_NET{VETH,NONE}, and VETHs should have this
+ * config */
+ assert(n->type == LXC_NET_NONE);
+ break;
+ }
+
+ pret = snprintf(veth_path, PATH_MAX, "lxc.network.%d.link", netnr);
+ if (pret < 0 || pret >= PATH_MAX) {
+ error = true;
+ goto out;
+ }
+
+ bridge = lxcapi_get_running_config_item(c, veth_path);
+ if (!bridge) {
+ error = true;
+ goto out;
+ }
+
+ pret = snprintf(veth_path, PATH_MAX, "%s/veth%d", directory, netnr);
+ if (pret < 0 || pret >= PATH_MAX || print_to_file(veth_path, veth) < 0) {
+ error = true;
+ goto out;
+ }
+
+ pret = snprintf(veth_path, PATH_MAX, "%s/bridge%d", directory, netnr);
+ if (pret < 0 || pret >= PATH_MAX || print_to_file(veth_path, bridge) < 0) {
+ error = true;
+ goto out;
+ }
+
+ if (n->name) {
+ if (strlen(n->name) >= 128) {
+ error = true;
+ goto out;
+ }
+ strncpy(eth, n->name, 128);
+ } else
+ sprintf(eth, "eth%d", netnr);
+
+ pret = snprintf(veth_path, PATH_MAX, "%s/eth%d", directory, netnr);
+ if (pret < 0 || pret >= PATH_MAX || print_to_file(veth_path, eth) < 0)
+ error = true;
+
+out:
+ free(veth);
+ free(bridge);
+ if (error)
+ return false;
+ }
+
+ pid = fork();
+ if (pid < 0)
+ return false;
+
+ if (pid == 0) {
+ struct criu_opts os;
+
+ os.action = "dump";
+ os.directory = directory;
+ os.c = c;
+ os.stop = stop;
+ os.verbose = verbose;
+
+ /* exec_criu() returning is an error */
+ exec_criu(&os);
+ exit(1);
+ } else {
+ pid_t w = waitpid(pid, &status, 0);
+ if (w == -1) {
+ perror("waitpid");
+ return false;
+ }
+
+ if (WIFEXITED(status)) {
+ return !WEXITSTATUS(status);
+ }
+
+ return false;
+ }
+}
+
+static bool lxcapi_restore(struct lxc_container *c, char *directory, bool verbose)
+{
+ pid_t pid;
+ struct lxc_list *it;
+ struct lxc_rootfs *rootfs;
+ char pidfile[L_tmpnam];
+
+ if (!criu_ok(c))
+ return false;
+
+ if (geteuid()) {
+ ERROR("Must be root to restore\n");
+ return false;
+ }
+
+ if (!tmpnam(pidfile))
+ return false;
+
+ struct lxc_handler *handler;
+
+ handler = lxc_init(c->name, c->lxc_conf, c->config_path);
+ if (!handler)
+ return false;
+
+ pid = fork();
+ if (pid < 0)
+ return false;
+
+ if (pid == 0) {
+ struct criu_opts os;
+
+ if (unshare(CLONE_NEWNS))
+ return false;
+
+ /* CRIU needs the lxc root bind mounted so that it is the root of some
+ * mount. */
+ rootfs = &c->lxc_conf->rootfs;
+
+ if (rootfs_is_blockdev(c->lxc_conf)) {
+ if (do_rootfs_setup(c->lxc_conf, c->name, c->config_path) < 0)
+ return false;
+ }
+ else {
+ if (mkdir(rootfs->mount, 0755) < 0 && errno != EEXIST)
+ return false;
+
+ if (mount(rootfs->path, rootfs->mount, NULL, MS_BIND, NULL) < 0) {
+ rmdir(rootfs->mount);
+ return false;
+ }
+ }
+
+ os.action = "restore";
+ os.directory = directory;
+ os.c = c;
+ os.pidfile = pidfile;
+ os.verbose = verbose;
+
+ /* exec_criu() returning is an error */
+ exec_criu(&os);
+ umount(rootfs->mount);
+ rmdir(rootfs->mount);
+ exit(1);
+ } else {
+ int status;
+ pid_t w = waitpid(pid, &status, 0);
+
+ if (w == -1) {
+ perror("waitpid");
+ return false;
+ }
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status)) {
+ return false;
+ }
+ else {
+ int netnr = 0, ret;
+ bool error = false;
+ FILE *f = fopen(pidfile, "r");
+ if (!f) {
+ perror("reading pidfile");
+ ERROR("couldn't read restore's init pidfile %s\n", pidfile);
+ return false;
+ }
+
+ ret = fscanf(f, "%d", (int*) &handler->pid);
+ fclose(f);
+ if (ret != 1) {
+ ERROR("reading restore pid failed");
+ return false;
+ }
+
+ if (container_mem_lock(c))
+ return false;
+
+ lxc_list_for_each(it, &c->lxc_conf->network) {
+ char eth[128], veth[128];
+ struct lxc_netdev *netdev = it->elem;
+
+ if (read_criu_file(directory, "veth", netnr, veth)) {
+ error = true;
+ goto out_unlock;
+ }
+ if (read_criu_file(directory, "eth", netnr, eth)) {
+ error = true;
+ goto out_unlock;
+ }
+ netdev->priv.veth_attr.pair = strdup(veth);
+ if (!netdev->priv.veth_attr.pair) {
+ error = true;
+ goto out_unlock;
+ }
+ netnr++;
+ }
+out_unlock:
+ container_mem_unlock(c);
+ if (error)
+ return false;
+
+ if (lxc_set_state(c->name, handler, RUNNING))
+ return false;
+ }
+ }
+
+ if (lxc_poll(c->name, handler)) {
+ lxc_abort(c->name, handler);
+ return false;
+ }
+ }
+
+ return true;
+}
+
static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...)
{
va_list ap;
{
struct lxc_container *c;
+ if (!name)
+ return NULL;
+
c = malloc(sizeof(*c));
if (!c) {
fprintf(stderr, "failed to malloc lxc_container\n");
c->config_path = strdup(lxc_global_config_value("lxc.lxcpath"));
if (!c->config_path) {
- fprintf(stderr, "Out of memory");
+ fprintf(stderr, "Out of memory\n");
goto err;
}
if (ongoing_create(c) == 2) {
ERROR("Error: %s creation was not completed", c->name);
- lxcapi_destroy(c);
+ container_destroy(c);
lxcapi_clear_config(c);
}
c->daemonize = true;
c->wait = lxcapi_wait;
c->set_config_item = lxcapi_set_config_item;
c->destroy = lxcapi_destroy;
+ c->destroy_with_snapshots = lxcapi_destroy_with_snapshots;
c->rename = lxcapi_rename;
c->save_config = lxcapi_save_config;
c->get_keys = lxcapi_get_keys;
c->snapshot_list = lxcapi_snapshot_list;
c->snapshot_restore = lxcapi_snapshot_restore;
c->snapshot_destroy = lxcapi_snapshot_destroy;
+ c->snapshot_destroy_all = lxcapi_snapshot_destroy_all;
c->may_control = lxcapi_may_control;
c->add_device_node = lxcapi_add_device_node;
c->remove_device_node = lxcapi_remove_device_node;
+ c->checkpoint = lxcapi_checkpoint;
+ c->restore = lxcapi_restore;
/* we'll allow the caller to update these later */
if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) {
projects / mirror_lxc.git / blobdiff