diff options
Diffstat (limited to 'libpod')
| -rw-r--r-- | libpod/container_validate.go | 99 | ||||
| -rw-r--r-- | libpod/options.go | 87 | ||||
| -rw-r--r-- | libpod/runtime_ctr.go | 28 |
3 files changed, 107 insertions, 107 deletions
diff --git a/libpod/container_validate.go b/libpod/container_validate.go new file mode 100644 index 000000000..b7f0aadff --- /dev/null +++ b/libpod/container_validate.go @@ -0,0 +1,99 @@ +package libpod + +import ( + "github.com/containers/libpod/libpod/define" + "github.com/containers/libpod/pkg/rootless" + spec "github.com/opencontainers/runtime-spec/specs-go" + "github.com/pkg/errors" +) + +// Validate that the configuration of a container is valid. +func (c *Container) validate() error { + imageIDSet := c.config.RootfsImageID != "" + imageNameSet := c.config.RootfsImageName != "" + rootfsSet := c.config.Rootfs != "" + + // If one of RootfsImageIDor RootfsImageName are set, both must be set. + if (imageIDSet || imageNameSet) && !(imageIDSet && imageNameSet) { + return errors.Wrapf(define.ErrInvalidArg, "both RootfsImageName and RootfsImageID must be set if either is set") + } + + // Cannot set RootfsImageID and Rootfs at the same time + if imageIDSet && rootfsSet { + return errors.Wrapf(define.ErrInvalidArg, "cannot set both an image ID and rootfs for a container") + } + + // Must set at least one of RootfsImageID or Rootfs + if !(imageIDSet || rootfsSet) { + return errors.Wrapf(define.ErrInvalidArg, "must set root filesystem source to either image or rootfs") + } + + // Cannot make a network namespace if we are joining another container's + // network namespace + if c.config.CreateNetNS && c.config.NetNsCtr != "" { + return errors.Wrapf(define.ErrInvalidArg, "cannot both create a network namespace and join another container's network namespace") + } + + // Not creating cgroups has a number of requirements, mostly related to + // the PID namespace. + if c.config.NoCgroups || c.config.CgroupsMode == "disabled" { + if c.config.PIDNsCtr != "" { + return errors.Wrapf(define.ErrInvalidArg, "cannot join another container's PID namespace if not creating cgroups") + } + + if c.config.CgroupParent != "" { + return errors.Wrapf(define.ErrInvalidArg, "cannot set cgroup parent if not creating cgroups") + } + + // Ensure we have a PID namespace + if c.config.Spec.Linux == nil { + return errors.Wrapf(define.ErrInvalidArg, "must provide Linux namespace configuration in OCI spec when using NoCgroups") + } + foundPid := false + for _, ns := range c.config.Spec.Linux.Namespaces { + if ns.Type == spec.PIDNamespace { + foundPid = true + if ns.Path != "" { + return errors.Wrapf(define.ErrInvalidArg, "containers not creating CGroups must create a private PID namespace - cannot use another") + } + break + } + } + if !foundPid { + return errors.Wrapf(define.ErrInvalidArg, "containers not creating CGroups must create a private PID namespace") + } + } + + // Rootless has some requirements, compared to networks. + if rootless.IsRootless() { + if len(c.config.Networks) > 0 { + return errors.Wrapf(define.ErrInvalidArg, "cannot join CNI networks if running rootless") + } + + // TODO: Should we make sure network mode is set to Slirp if set + // at all? + } + + // Can only set static IP or MAC is creating a network namespace. + if !c.config.CreateNetNS && (c.config.StaticIP != nil || c.config.StaticMAC != nil) { + return errors.Wrapf(define.ErrInvalidArg, "cannot set static IP or MAC address if not creating a network namespace") + } + + // Cannot set static IP or MAC if joining >1 CNI network. + if len(c.config.Networks) > 1 && (c.config.StaticIP != nil || c.config.StaticMAC != nil) { + return errors.Wrapf(define.ErrInvalidArg, "cannot set static IP or MAC address if joining more than one CNI network") + } + + // Using image resolv.conf conflicts with various DNS settings. + if c.config.UseImageResolvConf && + (len(c.config.DNSSearch) > 0 || len(c.config.DNSServer) > 0 || + len(c.config.DNSOption) > 0) { + return errors.Wrapf(define.ErrInvalidArg, "cannot configure DNS options if using image's resolv.conf") + } + + if c.config.UseImageHosts && len(c.config.HostAdd) > 0 { + return errors.Wrapf(define.ErrInvalidArg, "cannot add to /etc/hosts if using image's /etc/hosts") + } + + return nil +} diff --git a/libpod/options.go b/libpod/options.go index d01e8a85f..98de71af2 100644 --- a/libpod/options.go +++ b/libpod/options.go @@ -599,13 +599,6 @@ func WithRootFSFromImage(imageID string, imageName string) CtrCreateOption { return define.ErrCtrFinalized } - if ctr.config.RootfsImageID != "" || ctr.config.RootfsImageName != "" { - return errors.Wrapf(define.ErrInvalidArg, "container already configured with root filesystem") - } - if ctr.config.Rootfs != "" { - return errors.Wrapf(define.ErrInvalidArg, "cannot set both an image ID and a rootfs for a container") - } - ctr.config.RootfsImageID = imageID ctr.config.RootfsImageName = imageName @@ -815,10 +808,6 @@ func WithNetNSFrom(nsCtr *Container) CtrCreateOption { return err } - if ctr.config.CreateNetNS { - return errors.Wrapf(define.ErrInvalidArg, "cannot join another container's net ns as we are making a new net ns") - } - ctr.config.NetNsCtr = nsCtr.ID() return nil @@ -839,10 +828,6 @@ func WithPIDNSFrom(nsCtr *Container) CtrCreateOption { return err } - if ctr.config.NoCgroups { - return errors.Wrapf(define.ErrInvalidArg, "container has disabled creation of CGroups, which is incompatible with sharing a PID namespace") - } - ctr.config.PIDNsCtr = nsCtr.ID() return nil @@ -921,16 +906,8 @@ func WithDependencyCtrs(ctrs []*Container) CtrCreateOption { deps := make([]string, 0, len(ctrs)) for _, dep := range ctrs { - if !dep.valid { - return errors.Wrapf(define.ErrCtrRemoved, "container %s is not valid", dep.ID()) - } - - if dep.ID() == ctr.ID() { - return errors.Wrapf(define.ErrInvalidArg, "must specify another container") - } - - if ctr.config.Pod != "" && dep.config.Pod != ctr.config.Pod { - return errors.Wrapf(define.ErrInvalidArg, "container has joined pod %s and dependency container %s is not a member of the pod", ctr.config.Pod, dep.ID()) + if err := checkDependencyContainer(dep, ctr); err != nil { + return err } deps = append(deps, dep.ID()) @@ -952,20 +929,6 @@ func WithNetNS(portMappings []ocicni.PortMapping, postConfigureNetNS bool, netmo return define.ErrCtrFinalized } - if rootless.IsRootless() { - if len(networks) > 0 { - return errors.Wrapf(define.ErrInvalidArg, "cannot use CNI networks with rootless containers") - } - } - - if len(networks) > 1 && (ctr.config.StaticIP != nil || ctr.config.StaticMAC != nil) { - return errors.Wrapf(define.ErrInvalidArg, "cannot join more than one CNI network if configuring a static IP or MAC address") - } - - if ctr.config.NetNsCtr != "" { - return errors.Wrapf(define.ErrInvalidArg, "container is already set to join another container's net ns, cannot create a new net ns") - } - ctr.config.PostConfigureNetNS = postConfigureNetNS ctr.config.NetMode = namespaces.NetworkMode(netmode) ctr.config.CreateNetNS = true @@ -988,14 +951,6 @@ func WithStaticIP(ip net.IP) CtrCreateOption { return define.ErrCtrFinalized } - if !ctr.config.CreateNetNS { - return errors.Wrapf(define.ErrInvalidArg, "cannot set a static IP if the container is not creating a network namespace") - } - - if len(ctr.config.Networks) > 1 { - return errors.Wrapf(define.ErrInvalidArg, "cannot set a static IP if joining more than 1 CNI network") - } - ctr.config.StaticIP = ip return nil @@ -1013,14 +968,6 @@ func WithStaticMAC(mac net.HardwareAddr) CtrCreateOption { return define.ErrCtrFinalized } - if !ctr.config.CreateNetNS { - return errors.Wrapf(define.ErrInvalidArg, "cannot set a static MAC if the container is not creating a network namespace") - } - - if len(ctr.config.Networks) > 1 { - return errors.Wrapf(define.ErrInvalidArg, "cannot set a static MAC if joining more than 1 CNI network") - } - ctr.config.StaticMAC = mac return nil @@ -1114,10 +1061,6 @@ func WithCgroupParent(parent string) CtrCreateOption { return errors.Wrapf(define.ErrInvalidArg, "cgroup parent cannot be empty") } - if ctr.config.NoCgroups { - return errors.Wrapf(define.ErrInvalidArg, "CgroupParent conflicts with NoCgroups") - } - ctr.config.CgroupParent = parent return nil @@ -1130,9 +1073,6 @@ func WithDNSSearch(searchDomains []string) CtrCreateOption { if ctr.valid { return define.ErrCtrFinalized } - if ctr.config.UseImageResolvConf { - return errors.Wrapf(define.ErrInvalidArg, "cannot add DNS search domains if container will not create /etc/resolv.conf") - } ctr.config.DNSSearch = searchDomains return nil } @@ -1144,9 +1084,6 @@ func WithDNS(dnsServers []string) CtrCreateOption { if ctr.valid { return define.ErrCtrFinalized } - if ctr.config.UseImageResolvConf { - return errors.Wrapf(define.ErrInvalidArg, "cannot add DNS servers if container will not create /etc/resolv.conf") - } var dns []net.IP for _, i := range dnsServers { result := net.ParseIP(i) @@ -1166,9 +1103,6 @@ func WithDNSOption(dnsOptions []string) CtrCreateOption { if ctr.valid { return define.ErrCtrFinalized } - if ctr.config.UseImageResolvConf { - return errors.Wrapf(define.ErrInvalidArg, "cannot add DNS options if container will not create /etc/resolv.conf") - } ctr.config.DNSOption = dnsOptions return nil } @@ -1181,10 +1115,6 @@ func WithHosts(hosts []string) CtrCreateOption { return define.ErrCtrFinalized } - if ctr.config.UseImageHosts { - return errors.Wrapf(define.ErrInvalidArg, "cannot add hosts if container will not create /etc/hosts") - } - ctr.config.HostAdd = hosts return nil } @@ -1282,9 +1212,6 @@ func WithRootFS(rootfs string) CtrCreateOption { if _, err := os.Stat(rootfs); err != nil { return errors.Wrapf(err, "error checking path %q", rootfs) } - if ctr.config.RootfsImageID != "" { - return errors.Wrapf(define.ErrInvalidArg, "cannot set both an image ID and a rootfs for a container") - } ctr.config.Rootfs = rootfs return nil } @@ -1314,12 +1241,6 @@ func WithUseImageResolvConf() CtrCreateOption { return define.ErrCtrFinalized } - if len(ctr.config.DNSServer) != 0 || - len(ctr.config.DNSSearch) != 0 || - len(ctr.config.DNSOption) != 0 { - return errors.Wrapf(define.ErrInvalidArg, "not creating resolv.conf conflicts with DNS options") - } - ctr.config.UseImageResolvConf = true return nil @@ -1334,10 +1255,6 @@ func WithUseImageHosts() CtrCreateOption { return define.ErrCtrFinalized } - if len(ctr.config.HostAdd) != 0 { - return errors.Wrapf(define.ErrInvalidArg, "not creating /etc/hosts conflicts with adding to the hosts file") - } - ctr.config.UseImageHosts = true return nil diff --git a/libpod/runtime_ctr.go b/libpod/runtime_ctr.go index 39284026c..de93fdce7 100644 --- a/libpod/runtime_ctr.go +++ b/libpod/runtime_ctr.go @@ -133,7 +133,12 @@ func (r *Runtime) newContainer(ctx context.Context, rSpec *spec.Spec, options .. return r.setupContainer(ctx, ctr) } -func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (c *Container, err error) { +func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Container, err error) { + // Validate the container + if err := ctr.validate(); err != nil { + return nil, err + } + // Allocate a lock for the container lock, err := r.lockManager.AllocateLock() if err != nil { @@ -190,27 +195,6 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (c *Contai ctr.config.Name = name } - // If CGroups are disabled, we MUST create a PID namespace. - // Otherwise, the OCI runtime won't be able to stop our container. - if ctr.config.NoCgroups { - if ctr.config.Spec.Linux == nil { - return nil, errors.Wrapf(define.ErrInvalidArg, "must provide Linux namespace configuration in OCI spec when using NoCgroups") - } - foundPid := false - for _, ns := range ctr.config.Spec.Linux.Namespaces { - if ns.Type == spec.PIDNamespace { - foundPid = true - if ns.Path != "" { - return nil, errors.Wrapf(define.ErrInvalidArg, "containers not creating CGroups must create a private PID namespace - cannot use another") - } - break - } - } - if !foundPid { - return nil, errors.Wrapf(define.ErrInvalidArg, "containers not creating CGroups must create a private PID namespace") - } - } - // Check CGroup parent sanity, and set it if it was not set. // Only if we're actually configuring CGroups. if !ctr.config.NoCgroups { |