On Mon, Sep 07, 2015 at 05:25:03PM +0000, Serge Hallyn wrote: > Quoting Christian Brauner (christianvanbrau...@gmail.com): > > 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) { > > This doesn't match what was advertised - < 0 should also mean > ephemeral. (I really think a boolean makes the most sense, > enforced in the conffile as must be 0|1.)
Ok. > > > + /* Only destroy when rootfs is overlayfs or aufs for now. The > > + * function however, works for other bdev types as well. */ > > What is the reason for that limitation? So far we only seem to use it for overlayfs and aufs based containers and I didn't want to be hasty making it usable for any kind of container. > > > + 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); > > + } > > + } > > + 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) > > The one in lxccontainers.c should somehow be shared. We can put it in bdev.c and bdev.h > > > +{ > > + 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) > > Hm, I guess it's easier just to keep this one static in > the two places like you're doing. Ok. > > > +{ > > + char *arg = (char *) data; > > + return lxc_rmdir_onedev(arg, NULL); > > +} > > + > > -- > > 2.5.1 > >
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