From: "Daniel P. Berrange" <berrange@redhat.com> For a root filesystem with type=file or type=block, the LXC container was forgetting to actually mount it, before doing the pivot root step. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> --- src/lxc/lxc_container.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c index be9bc6c..002dba1 100644 --- a/src/lxc/lxc_container.c +++ b/src/lxc/lxc_container.c @@ -105,6 +105,9 @@ struct __lxc_child_argv { int handshakefd; }; +static int lxcContainerMountFSBlock(virDomainFSDefPtr fs, + const char *srcprefix); + /* * reboot(LINUX_REBOOT_CMD_CAD_ON) will return -EINVAL @@ -406,6 +409,51 @@ static int lxcContainerChildMountSort(const void *a, const void *b) # define MS_SLAVE (1<<19) #endif +static int lxcContainerPrepareRoot(virDomainDefPtr def, + virDomainFSDefPtr root) +{ + char *dst; + char *tmp; + + if (root->type == VIR_DOMAIN_FS_TYPE_MOUNT) + return 0; + + if (root->type == VIR_DOMAIN_FS_TYPE_FILE) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Unexpected root filesystem without loop device")); + return -1; + } + + if (root->type != VIR_DOMAIN_FS_TYPE_BLOCK) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Unsupported root filesystem type %s"), + virDomainFSTypeToString(root->type)); + return -1; + } + + if (virAsprintf(&dst, "%s/%s.root", + LXC_STATE_DIR, def->name) < 0) { + virReportOOMError(); + return -1; + } + + tmp = root->dst; + root->dst = dst; + + if (lxcContainerMountFSBlock(root, "") < 0) { + root->dst = tmp; + VIR_FREE(dst); + return -1; + } + + root->dst = tmp; + root->type = VIR_DOMAIN_FS_TYPE_MOUNT; + VIR_FREE(root->src); + root->src = dst; + + return 0; +} + static int lxcContainerPivotRoot(virDomainFSDefPtr root) { int ret; @@ -1926,6 +1974,10 @@ static int lxcContainerSetupPivotRoot(virDomainDefPtr vmDef, if (lxcContainerIdentifyCGroups(&mounts, &nmounts, &cgroupRoot) < 0) goto cleanup; + /* Ensure the root filesystem is mounted */ + if (lxcContainerPrepareRoot(vmDef, root) < 0) + goto cleanup; + /* Gives us a private root, leaving all parent OS mounts on /.oldroot */ if (lxcContainerPivotRoot(root) < 0) goto cleanup; -- 1.7.11.7