Fixes for the return value checks. On Sun, Sep 06, 2015 at 10:38:21AM +0200, Christian Brauner wrote: > Now we can e.g. implement ephemeral containers in a consistent way. > > Signed-off-by: Christian Brauner <christianvanbrau...@gmail.com> > > 100.0% src/lxc/ > diff --git a/src/lxc/start.c b/src/lxc/start.c > index ffb8d12..1179d2c 100644 > --- a/src/lxc/start.c > +++ b/src/lxc/start.c > @@ -83,6 +83,11 @@ const struct ns_info ns_info[LXC_NS_MAX] = { > [LXC_NS_NET] = {"net", CLONE_NEWNET} > }; > > +static int bdev_destroy_wrapper(void *data); > +static int lxc_rmdir_onedev_wrapper(void *data); > +static void lxc_destroy_container_on_signal(struct lxc_handler *handler, > + const char *name); > + > static void print_top_failing_dir(const char *path) > { > size_t len = strlen(path); > @@ -495,6 +500,13 @@ void lxc_fini(const char *name, struct lxc_handler > *handler) > close(handler->ttysock[0]); > close(handler->ttysock[1]); > } > + if (handler->conf->ephemeral > 0) { > + /* Only destroy when rootfs is overlayfs or aufs for now. The > + * function however, works for other bdev types as well. */ > + if ((strncmp(handler->conf->rootfs.path, "overlayfs:", 10) == > 0) || > + (strncmp(handler->conf->rootfs.path, "aufs:", 5) == 0)) > + lxc_destroy_container_on_signal(handler, name); > + } > cgroup_destroy(handler); > free(handler); > } > @@ -1291,3 +1303,61 @@ int lxc_start(const char *name, char *const argv[], > struct lxc_conf *conf, > conf->need_utmp_watch = 1; > return __lxc_start(name, conf, &start_ops, &start_arg, lxcpath, > backgrounded); > } > + > +static void lxc_destroy_container_on_signal(struct lxc_handler *handler, > + const char *name) > +{ > + char destroy[MAXPATHLEN]; > + bool bret = true; > + int ret = 0; > + if (handler->conf && handler->conf->rootfs.path && > handler->conf->rootfs.mount) { > + if (am_unpriv()) > + ret = userns_exec_1(handler->conf, > bdev_destroy_wrapper, handler->conf); > + else > + bret = bdev_destroy(handler->conf); > + if (ret < 0 || !bret) { > + ERROR("Error destroying rootfs for %s", name); > + } else { > + INFO("Destroyed rootfs for %s", name); > + } > + }
The check for the return value here is wrong but it is fixed in the PR on github. > + ret = snprintf(destroy, MAXPATHLEN, "%s/%s", handler->lxcpath, name); > + if (ret < 0 || ret >= MAXPATHLEN) > + ERROR("Error creating string"); > + if (am_unpriv()) > + ret = userns_exec_1(handler->conf, lxc_rmdir_onedev_wrapper, > destroy); > + else > + ret = lxc_rmdir_onedev(destroy, NULL); > + if (ret < 0) { > + ERROR("Error destroying container directory for %s", name); > + } else { > + INFO("Destroyed directory for %s", name); > + } > +} > + > +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; > + } > + if (!bdev_destroy(conf)) > + return -1; > + else > + return 0; > +} > + > +static int lxc_rmdir_onedev_wrapper(void *data) > +{ > + char *arg = (char *) data; > + return lxc_rmdir_onedev(arg, NULL); > +} > + > -- > 2.5.1 > On Sun, Sep 06, 2015 at 10:38:20AM +0200, Christian Brauner wrote: > Signed-off-by: Christian Brauner <christianvanbrau...@gmail.com> > > 100.0% src/lxc/ > diff --git a/src/lxc/lxccontainer.c b/src/lxc/lxccontainer.c > index 2103437..9f22fdc 100644 > --- a/src/lxc/lxccontainer.c > +++ b/src/lxc/lxccontainer.c > @@ -2213,21 +2213,6 @@ static int lxc_rmdir_onedev_wrapper(void *data) > return lxc_rmdir_onedev(arg, "snaps"); > } > > -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; > @@ -2242,13 +2227,16 @@ static int bdev_destroy_wrapper(void *data) > ERROR("Failed to setuid to 0"); > return -1; > } > - return do_bdev_destroy(conf); > + if (!bdev_destroy(conf)) > + return -1; > + else > + return 0; > } > > static bool container_destroy(struct lxc_container *c) > { > bool bret = false; > - int ret; > + int ret = 0; > struct lxc_conf *conf; > > if (!c || !do_lxcapi_is_defined(c)) > @@ -2304,8 +2292,8 @@ static bool container_destroy(struct lxc_container *c) > if (am_unpriv()) > ret = userns_exec_1(conf, bdev_destroy_wrapper, conf); > else > - ret = do_bdev_destroy(conf); > - if (ret < 0) { > + bret = bdev_destroy(conf); > + if (ret < 0 || !bret) { > ERROR("Error destroying rootfs for %s", c->name); > goto out; > } The check for the return value here is wrong but it is fixed in the PR on github. > -- > 2.5.1 >
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