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https://github.com/opencontainers/runc.git
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Make state.json 25% smaller
This makes the state.json file 1303 bytes or almost 25% smaller (when using the default spec, YMMV) by omitting default values. Before: 5496 bytes After: 4193 bytes (With cgroups#9 applied, the new size is 3424, which is almost 40% savings, compared to the original). Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin
@@ -92,69 +92,69 @@ type Syscall struct {
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// Config defines configuration options for executing a process inside a contained environment.
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type Config struct {
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// NoPivotRoot will use MS_MOVE and a chroot to jail the process into the container's rootfs
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// This is a common option when the container is running in ramdisk
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NoPivotRoot bool `json:"no_pivot_root"`
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// This is a common option when the container is running in ramdisk.
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NoPivotRoot bool `json:"no_pivot_root,omitempty"`
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// ParentDeathSignal specifies the signal that is sent to the container's process in the case
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// that the parent process dies.
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ParentDeathSignal int `json:"parent_death_signal"`
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ParentDeathSignal int `json:"parent_death_signal,omitempty"`
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// Path to a directory containing the container's root filesystem.
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Rootfs string `json:"rootfs"`
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// Umask is the umask to use inside of the container.
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Umask *uint32 `json:"umask"`
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Umask *uint32 `json:"umask,omitempty"`
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// Readonlyfs will remount the container's rootfs as readonly where only externally mounted
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// bind mounts are writtable.
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Readonlyfs bool `json:"readonlyfs"`
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Readonlyfs bool `json:"readonlyfs,omitempty"`
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// Specifies the mount propagation flags to be applied to /.
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RootPropagation int `json:"rootPropagation"`
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RootPropagation int `json:"rootPropagation,omitempty"`
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// Mounts specify additional source and destination paths that will be mounted inside the container's
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// rootfs and mount namespace if specified
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// rootfs and mount namespace if specified.
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Mounts []*Mount `json:"mounts"`
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// The device nodes that should be automatically created within the container upon container start. Note, make sure that the node is marked as allowed in the cgroup as well!
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Devices []*devices.Device `json:"devices"`
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MountLabel string `json:"mount_label"`
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MountLabel string `json:"mount_label,omitempty"`
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// Hostname optionally sets the container's hostname if provided
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Hostname string `json:"hostname"`
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// Hostname optionally sets the container's hostname if provided.
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Hostname string `json:"hostname,omitempty"`
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// Domainname optionally sets the container's domainname if provided
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Domainname string `json:"domainname"`
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// Domainname optionally sets the container's domainname if provided.
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Domainname string `json:"domainname,omitempty"`
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// Namespaces specifies the container's namespaces that it should setup when cloning the init process
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// If a namespace is not provided that namespace is shared from the container's parent process
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// If a namespace is not provided that namespace is shared from the container's parent process.
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Namespaces Namespaces `json:"namespaces"`
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// Capabilities specify the capabilities to keep when executing the process inside the container
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// All capabilities not specified will be dropped from the processes capability mask
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Capabilities *Capabilities `json:"capabilities"`
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// All capabilities not specified will be dropped from the processes capability mask.
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Capabilities *Capabilities `json:"capabilities,omitempty"`
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// Networks specifies the container's network setup to be created
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Networks []*Network `json:"networks"`
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// Networks specifies the container's network setup to be created.
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Networks []*Network `json:"networks,omitempty"`
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// Routes can be specified to create entries in the route table as the container is started
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Routes []*Route `json:"routes"`
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// Routes can be specified to create entries in the route table as the container is started.
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Routes []*Route `json:"routes,omitempty"`
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// Cgroups specifies specific cgroup settings for the various subsystems that the container is
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// placed into to limit the resources the container has available
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// placed into to limit the resources the container has available.
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Cgroups *Cgroup `json:"cgroups"`
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// AppArmorProfile specifies the profile to apply to the process running in the container and is
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// change at the time the process is execed
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// change at the time the process is executed.
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AppArmorProfile string `json:"apparmor_profile,omitempty"`
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// ProcessLabel specifies the label to apply to the process running in the container. It is
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// commonly used by selinux
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// commonly used by selinux.
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ProcessLabel string `json:"process_label,omitempty"`
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// Rlimits specifies the resource limits, such as max open files, to set in the container
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// If Rlimits are not set, the container will inherit rlimits from the parent process
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// If Rlimits are not set, the container will inherit rlimits from the parent process.
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Rlimits []Rlimit `json:"rlimits,omitempty"`
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// OomScoreAdj specifies the adjustment to be made by the kernel when calculating oom scores
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@@ -164,35 +164,35 @@ type Config struct {
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// More information about kernel oom score calculation here: https://lwn.net/Articles/317814/
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OomScoreAdj *int `json:"oom_score_adj,omitempty"`
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// UIDMappings is an array of User ID mappings for User Namespaces
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UIDMappings []IDMap `json:"uid_mappings"`
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// UIDMappings is an array of User ID mappings for User Namespaces.
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UIDMappings []IDMap `json:"uid_mappings,omitempty"`
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// GIDMappings is an array of Group ID mappings for User Namespaces
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GIDMappings []IDMap `json:"gid_mappings"`
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// GIDMappings is an array of Group ID mappings for User Namespaces.
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GIDMappings []IDMap `json:"gid_mappings,omitempty"`
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// MaskPaths specifies paths within the container's rootfs to mask over with a bind
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// mount pointing to /dev/null as to prevent reads of the file.
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MaskPaths []string `json:"mask_paths"`
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MaskPaths []string `json:"mask_paths,omitempty"`
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// ReadonlyPaths specifies paths within the container's rootfs to remount as read-only
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// so that these files prevent any writes.
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ReadonlyPaths []string `json:"readonly_paths"`
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ReadonlyPaths []string `json:"readonly_paths,omitempty"`
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// Sysctl is a map of properties and their values. It is the equivalent of using
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// sysctl -w my.property.name value in Linux.
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Sysctl map[string]string `json:"sysctl"`
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Sysctl map[string]string `json:"sysctl,omitempty"`
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// Seccomp allows actions to be taken whenever a syscall is made within the container.
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// A number of rules are given, each having an action to be taken if a syscall matches it.
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// A default action to be taken if no rules match is also given.
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Seccomp *Seccomp `json:"seccomp"`
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Seccomp *Seccomp `json:"seccomp,omitempty"`
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// NoNewPrivileges controls whether processes in the container can gain additional privileges.
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NoNewPrivileges bool `json:"no_new_privileges,omitempty"`
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// Hooks are a collection of actions to perform at various container lifecycle events.
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// CommandHooks are serialized to JSON, but other hooks are not.
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Hooks Hooks
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Hooks Hooks `json:"Hooks,omitempty"`
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// Version is the version of opencontainer specification that is supported.
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Version string `json:"version"`
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@@ -202,7 +202,7 @@ type Config struct {
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// NoNewKeyring will not allocated a new session keyring for the container. It will use the
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// callers keyring in this case.
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NoNewKeyring bool `json:"no_new_keyring"`
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NoNewKeyring bool `json:"no_new_keyring,omitempty"`
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// IntelRdt specifies settings for Intel RDT group that the container is placed into
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// to limit the resources (e.g., L3 cache, memory bandwidth) the container has available
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@@ -445,15 +445,15 @@ func KnownHookNames() []string {
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type Capabilities struct {
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// Bounding is the set of capabilities checked by the kernel.
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Bounding []string
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Bounding []string `json:"Bounding,omitempty"`
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// Effective is the set of capabilities checked by the kernel.
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Effective []string
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Effective []string `json:"Effective,omitempty"`
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// Inheritable is the capabilities preserved across execve.
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Inheritable []string
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Inheritable []string `json:"Inheritable,omitempty"`
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// Permitted is the limiting superset for effective capabilities.
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Permitted []string
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Permitted []string `json:"Permitted,omitempty"`
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// Ambient is the ambient set of capabilities that are kept.
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Ambient []string
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Ambient []string `json:"Ambient,omitempty"`
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}
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// Deprecated: use (Hooks).Run instead.
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@@ -4,7 +4,7 @@ import "golang.org/x/sys/unix"
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type MountIDMapping struct {
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// Recursive indicates if the mapping needs to be recursive.
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Recursive bool `json:"recursive"`
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Recursive bool `json:"recursive,omitempty"`
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// UserNSPath is a path to a user namespace that indicates the necessary
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// id-mappings for MOUNT_ATTR_IDMAP. If set to non-"", UIDMappings and
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@@ -31,26 +31,26 @@ type Mount struct {
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Device string `json:"device"`
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// Mount flags.
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Flags int `json:"flags"`
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Flags int `json:"flags,omitempty"`
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// Mount flags that were explicitly cleared in the configuration (meaning
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// the user explicitly requested that these flags *not* be set).
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ClearedFlags int `json:"cleared_flags"`
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ClearedFlags int `json:"cleared_flags,omitempty"`
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// Propagation Flags
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PropagationFlags []int `json:"propagation_flags"`
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// Propagation flags.
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PropagationFlags []int `json:"propagation_flags,omitempty"`
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// Mount data applied to the mount.
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Data string `json:"data"`
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Data string `json:"data,omitempty"`
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// Relabel source if set, "z" indicates shared, "Z" indicates unshared.
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Relabel string `json:"relabel"`
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Relabel string `json:"relabel,omitempty"`
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// RecAttr represents mount properties to be applied recursively (AT_RECURSIVE), see mount_setattr(2).
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RecAttr *unix.MountAttr `json:"rec_attr"`
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RecAttr *unix.MountAttr `json:"rec_attr,omitempty"`
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// Extensions are additional flags that are specific to runc.
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Extensions int `json:"extensions"`
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Extensions int `json:"extensions,omitempty"`
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// Mapping is the MOUNT_ATTR_IDMAP configuration for the mount. If non-nil,
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// the mount is configured to use MOUNT_ATTR_IDMAP-style id mappings.
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@@ -86,7 +86,7 @@ func NamespaceTypes() []NamespaceType {
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// alternate path that is able to be joined via setns.
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type Namespace struct {
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Type NamespaceType `json:"type"`
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Path string `json:"path"`
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Path string `json:"path,omitempty"`
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}
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func (n *Namespace) GetPath(pid int) string {
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@@ -5,49 +5,49 @@ package configs
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// The network configuration can be omitted from a container causing the
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// container to be setup with the host's networking stack
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type Network struct {
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// Type sets the networks type, commonly veth and loopback
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// Type sets the networks type, commonly veth and loopback.
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Type string `json:"type"`
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// Name of the network interface
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Name string `json:"name"`
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// Name of the network interface.
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Name string `json:"name,omitempty"`
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// The bridge to use.
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Bridge string `json:"bridge"`
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Bridge string `json:"bridge,omitempty"`
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// MacAddress contains the MAC address to set on the network interface
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MacAddress string `json:"mac_address"`
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// MacAddress contains the MAC address to set on the network interface.
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MacAddress string `json:"mac_address,omitempty"`
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// Address contains the IPv4 and mask to set on the network interface
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Address string `json:"address"`
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// Address contains the IPv4 and mask to set on the network interface.
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Address string `json:"address,omitempty"`
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// Gateway sets the gateway address that is used as the default for the interface
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Gateway string `json:"gateway"`
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// Gateway sets the gateway address that is used as the default for the interface.
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Gateway string `json:"gateway,omitempty"`
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// IPv6Address contains the IPv6 and mask to set on the network interface
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IPv6Address string `json:"ipv6_address"`
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// IPv6Address contains the IPv6 and mask to set on the network interface.
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IPv6Address string `json:"ipv6_address,omitempty"`
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// IPv6Gateway sets the ipv6 gateway address that is used as the default for the interface
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IPv6Gateway string `json:"ipv6_gateway"`
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// IPv6Gateway sets the ipv6 gateway address that is used as the default for the interface.
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IPv6Gateway string `json:"ipv6_gateway,omitempty"`
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// Mtu sets the mtu value for the interface and will be mirrored on both the host and
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// container's interfaces if a pair is created, specifically in the case of type veth
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// Note: This does not apply to loopback interfaces.
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Mtu int `json:"mtu"`
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Mtu int `json:"mtu,omitempty"`
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// TxQueueLen sets the tx_queuelen value for the interface and will be mirrored on both the host and
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// container's interfaces if a pair is created, specifically in the case of type veth
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// Note: This does not apply to loopback interfaces.
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TxQueueLen int `json:"txqueuelen"`
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TxQueueLen int `json:"txqueuelen,omitempty"`
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// HostInterfaceName is a unique name of a veth pair that resides on in the host interface of the
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// container.
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HostInterfaceName string `json:"host_interface_name"`
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HostInterfaceName string `json:"host_interface_name,omitempty"`
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// HairpinMode specifies if hairpin NAT should be enabled on the virtual interface
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// bridge port in the case of type veth
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// Note: This is unsupported on some systems.
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// Note: This does not apply to loopback interfaces.
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HairpinMode bool `json:"hairpin_mode"`
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HairpinMode bool `json:"hairpin_mode,omitempty"`
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}
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// Route defines a routing table entry.
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@@ -62,14 +62,14 @@ type Network struct {
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// destination of 0.0.0.0(or *) when viewed in the route table.
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type Route struct {
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// Destination specifies the destination IP address and mask in the CIDR form.
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Destination string `json:"destination"`
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Destination string `json:"destination,omitempty"`
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// Source specifies the source IP address and mask in the CIDR form.
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Source string `json:"source"`
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Source string `json:"source,omitempty"`
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// Gateway specifies the gateway IP address.
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Gateway string `json:"gateway"`
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Gateway string `json:"gateway,omitempty"`
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// InterfaceName specifies the device to set this route up for, for example eth0.
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InterfaceName string `json:"interface_name"`
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InterfaceName string `json:"interface_name,omitempty"`
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}
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