Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

1 files changed, 1256 insertions, 0 deletions

diff --git a/vendor/github.com/opencontainers/runtime-tools/generate/generate.go b/vendor/github.com/opencontainers/runtime-tools/generate/generate.go
new file mode 100644
index 000000000..fce88f5e2
--- /dev/null
+++ b/vendor/github.com/opencontainers/runtime-tools/generate/generate.go
@@ -0,0 +1,1256 @@
+// Package generate implements functions generating container config files.
+package generate
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	rspec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/runtime-tools/generate/seccomp"
+	"github.com/opencontainers/runtime-tools/validate"
+	"github.com/syndtr/gocapability/capability"
+)
+
+var (
+	// Namespaces include the names of supported namespaces.
+	Namespaces = []string{"network", "pid", "mount", "ipc", "uts", "user", "cgroup"}
+)
+
+// Generator represents a generator for a container spec.
+type Generator struct {
+	spec         *rspec.Spec
+	HostSpecific bool
+}
+
+// ExportOptions have toggles for exporting only certain parts of the specification
+type ExportOptions struct {
+	Seccomp bool // seccomp toggles if only seccomp should be exported
+}
+
+// New creates a spec Generator with the default spec.
+func New() Generator {
+	spec := rspec.Spec{
+		Version: rspec.Version,
+		Root: &rspec.Root{
+			Path:     "",
+			Readonly: false,
+		},
+		Process: &rspec.Process{
+			Terminal: false,
+			User:     rspec.User{},
+			Args: []string{
+				"sh",
+			},
+			Env: []string{
+				"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+				"TERM=xterm",
+			},
+			Cwd: "/",
+			Capabilities: &rspec.LinuxCapabilities{
+				Bounding: []string{
+					"CAP_CHOWN",
+					"CAP_DAC_OVERRIDE",
+					"CAP_FSETID",
+					"CAP_FOWNER",
+					"CAP_MKNOD",
+					"CAP_NET_RAW",
+					"CAP_SETGID",
+					"CAP_SETUID",
+					"CAP_SETFCAP",
+					"CAP_SETPCAP",
+					"CAP_NET_BIND_SERVICE",
+					"CAP_SYS_CHROOT",
+					"CAP_KILL",
+					"CAP_AUDIT_WRITE",
+				},
+				Permitted: []string{
+					"CAP_CHOWN",
+					"CAP_DAC_OVERRIDE",
+					"CAP_FSETID",
+					"CAP_FOWNER",
+					"CAP_MKNOD",
+					"CAP_NET_RAW",
+					"CAP_SETGID",
+					"CAP_SETUID",
+					"CAP_SETFCAP",
+					"CAP_SETPCAP",
+					"CAP_NET_BIND_SERVICE",
+					"CAP_SYS_CHROOT",
+					"CAP_KILL",
+					"CAP_AUDIT_WRITE",
+				},
+				Inheritable: []string{
+					"CAP_CHOWN",
+					"CAP_DAC_OVERRIDE",
+					"CAP_FSETID",
+					"CAP_FOWNER",
+					"CAP_MKNOD",
+					"CAP_NET_RAW",
+					"CAP_SETGID",
+					"CAP_SETUID",
+					"CAP_SETFCAP",
+					"CAP_SETPCAP",
+					"CAP_NET_BIND_SERVICE",
+					"CAP_SYS_CHROOT",
+					"CAP_KILL",
+					"CAP_AUDIT_WRITE",
+				},
+				Effective: []string{
+					"CAP_CHOWN",
+					"CAP_DAC_OVERRIDE",
+					"CAP_FSETID",
+					"CAP_FOWNER",
+					"CAP_MKNOD",
+					"CAP_NET_RAW",
+					"CAP_SETGID",
+					"CAP_SETUID",
+					"CAP_SETFCAP",
+					"CAP_SETPCAP",
+					"CAP_NET_BIND_SERVICE",
+					"CAP_SYS_CHROOT",
+					"CAP_KILL",
+					"CAP_AUDIT_WRITE",
+				},
+				Ambient: []string{
+					"CAP_CHOWN",
+					"CAP_DAC_OVERRIDE",
+					"CAP_FSETID",
+					"CAP_FOWNER",
+					"CAP_MKNOD",
+					"CAP_NET_RAW",
+					"CAP_SETGID",
+					"CAP_SETUID",
+					"CAP_SETFCAP",
+					"CAP_SETPCAP",
+					"CAP_NET_BIND_SERVICE",
+					"CAP_SYS_CHROOT",
+					"CAP_KILL",
+					"CAP_AUDIT_WRITE",
+				},
+			},
+			Rlimits: []rspec.POSIXRlimit{
+				{
+					Type: "RLIMIT_NOFILE",
+					Hard: uint64(1024),
+					Soft: uint64(1024),
+				},
+			},
+		},
+		Hostname: "mrsdalloway",
+		Mounts: []rspec.Mount{
+			{
+				Destination: "/proc",
+				Type:        "proc",
+				Source:      "proc",
+				Options:     nil,
+			},
+			{
+				Destination: "/dev",
+				Type:        "tmpfs",
+				Source:      "tmpfs",
+				Options:     []string{"nosuid", "strictatime", "mode=755", "size=65536k"},
+			},
+			{
+				Destination: "/dev/pts",
+				Type:        "devpts",
+				Source:      "devpts",
+				Options:     []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
+			},
+			{
+				Destination: "/dev/shm",
+				Type:        "tmpfs",
+				Source:      "shm",
+				Options:     []string{"nosuid", "noexec", "nodev", "mode=1777", "size=65536k"},
+			},
+			{
+				Destination: "/dev/mqueue",
+				Type:        "mqueue",
+				Source:      "mqueue",
+				Options:     []string{"nosuid", "noexec", "nodev"},
+			},
+			{
+				Destination: "/sys",
+				Type:        "sysfs",
+				Source:      "sysfs",
+				Options:     []string{"nosuid", "noexec", "nodev", "ro"},
+			},
+		},
+		Linux: &rspec.Linux{
+			Resources: &rspec.LinuxResources{
+				Devices: []rspec.LinuxDeviceCgroup{
+					{
+						Allow:  false,
+						Access: "rwm",
+					},
+				},
+			},
+			Namespaces: []rspec.LinuxNamespace{
+				{
+					Type: "pid",
+				},
+				{
+					Type: "network",
+				},
+				{
+					Type: "ipc",
+				},
+				{
+					Type: "uts",
+				},
+				{
+					Type: "mount",
+				},
+			},
+			Devices: []rspec.LinuxDevice{},
+		},
+	}
+	spec.Linux.Seccomp = seccomp.DefaultProfile(&spec)
+	return Generator{
+		spec: &spec,
+	}
+}
+
+// NewFromSpec creates a spec Generator from a given spec.
+func NewFromSpec(spec *rspec.Spec) Generator {
+	return Generator{
+		spec: spec,
+	}
+}
+
+// NewFromFile loads the template specified in a file into a spec Generator.
+func NewFromFile(path string) (Generator, error) {
+	cf, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return Generator{}, fmt.Errorf("template configuration at %s not found", path)
+		}
+	}
+	defer cf.Close()
+
+	return NewFromTemplate(cf)
+}
+
+// NewFromTemplate loads the template from io.Reader into a spec Generator.
+func NewFromTemplate(r io.Reader) (Generator, error) {
+	var spec rspec.Spec
+	if err := json.NewDecoder(r).Decode(&spec); err != nil {
+		return Generator{}, err
+	}
+	return Generator{
+		spec: &spec,
+	}, nil
+}
+
+// SetSpec sets the spec in the Generator g.
+func (g *Generator) SetSpec(spec *rspec.Spec) {
+	g.spec = spec
+}
+
+// Spec gets the spec in the Generator g.
+func (g *Generator) Spec() *rspec.Spec {
+	return g.spec
+}
+
+// Save writes the spec into w.
+func (g *Generator) Save(w io.Writer, exportOpts ExportOptions) (err error) {
+	var data []byte
+
+	if g.spec.Linux != nil {
+		buf, err := json.Marshal(g.spec.Linux)
+		if err != nil {
+			return err
+		}
+		if string(buf) == "{}" {
+			g.spec.Linux = nil
+		}
+	}
+
+	if exportOpts.Seccomp {
+		data, err = json.MarshalIndent(g.spec.Linux.Seccomp, "", "\t")
+	} else {
+		data, err = json.MarshalIndent(g.spec, "", "\t")
+	}
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// SaveToFile writes the spec into a file.
+func (g *Generator) SaveToFile(path string, exportOpts ExportOptions) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return g.Save(f, exportOpts)
+}
+
+// SetVersion sets g.spec.Version.
+func (g *Generator) SetVersion(version string) {
+	g.initSpec()
+	g.spec.Version = version
+}
+
+// SetRootPath sets g.spec.Root.Path.
+func (g *Generator) SetRootPath(path string) {
+	g.initSpecRoot()
+	g.spec.Root.Path = path
+}
+
+// SetRootReadonly sets g.spec.Root.Readonly.
+func (g *Generator) SetRootReadonly(b bool) {
+	g.initSpecRoot()
+	g.spec.Root.Readonly = b
+}
+
+// SetHostname sets g.spec.Hostname.
+func (g *Generator) SetHostname(s string) {
+	g.initSpec()
+	g.spec.Hostname = s
+}
+
+// ClearAnnotations clears g.spec.Annotations.
+func (g *Generator) ClearAnnotations() {
+	if g.spec == nil {
+		return
+	}
+	g.spec.Annotations = make(map[string]string)
+}
+
+// AddAnnotation adds an annotation into g.spec.Annotations.
+func (g *Generator) AddAnnotation(key, value string) {
+	g.initSpecAnnotations()
+	g.spec.Annotations[key] = value
+}
+
+// RemoveAnnotation remove an annotation from g.spec.Annotations.
+func (g *Generator) RemoveAnnotation(key string) {
+	if g.spec == nil || g.spec.Annotations == nil {
+		return
+	}
+	delete(g.spec.Annotations, key)
+}
+
+// SetProcessConsoleSize sets g.spec.Process.ConsoleSize.
+func (g *Generator) SetProcessConsoleSize(width, height uint) {
+	g.initSpecProcessConsoleSize()
+	g.spec.Process.ConsoleSize.Width = width
+	g.spec.Process.ConsoleSize.Height = height
+}
+
+// SetProcessUID sets g.spec.Process.User.UID.
+func (g *Generator) SetProcessUID(uid uint32) {
+	g.initSpecProcess()
+	g.spec.Process.User.UID = uid
+}
+
+// SetProcessGID sets g.spec.Process.User.GID.
+func (g *Generator) SetProcessGID(gid uint32) {
+	g.initSpecProcess()
+	g.spec.Process.User.GID = gid
+}
+
+// SetProcessCwd sets g.spec.Process.Cwd.
+func (g *Generator) SetProcessCwd(cwd string) {
+	g.initSpecProcess()
+	g.spec.Process.Cwd = cwd
+}
+
+// SetProcessNoNewPrivileges sets g.spec.Process.NoNewPrivileges.
+func (g *Generator) SetProcessNoNewPrivileges(b bool) {
+	g.initSpecProcess()
+	g.spec.Process.NoNewPrivileges = b
+}
+
+// SetProcessTerminal sets g.spec.Process.Terminal.
+func (g *Generator) SetProcessTerminal(b bool) {
+	g.initSpecProcess()
+	g.spec.Process.Terminal = b
+}
+
+// SetProcessApparmorProfile sets g.spec.Process.ApparmorProfile.
+func (g *Generator) SetProcessApparmorProfile(prof string) {
+	g.initSpecProcess()
+	g.spec.Process.ApparmorProfile = prof
+}
+
+// SetProcessArgs sets g.spec.Process.Args.
+func (g *Generator) SetProcessArgs(args []string) {
+	g.initSpecProcess()
+	g.spec.Process.Args = args
+}
+
+// ClearProcessEnv clears g.spec.Process.Env.
+func (g *Generator) ClearProcessEnv() {
+	if g.spec == nil {
+		return
+	}
+	g.spec.Process.Env = []string{}
+}
+
+// AddProcessEnv adds name=value into g.spec.Process.Env, or replaces an
+// existing entry with the given name.
+func (g *Generator) AddProcessEnv(name, value string) {
+	g.initSpecProcess()
+
+	env := fmt.Sprintf("%s=%s", name, value)
+	for idx := range g.spec.Process.Env {
+		if strings.HasPrefix(g.spec.Process.Env[idx], name+"=") {
+			g.spec.Process.Env[idx] = env
+			return
+		}
+	}
+	g.spec.Process.Env = append(g.spec.Process.Env, env)
+}
+
+// AddProcessRlimits adds rlimit into g.spec.Process.Rlimits.
+func (g *Generator) AddProcessRlimits(rType string, rHard uint64, rSoft uint64) {
+	g.initSpecProcess()
+	for i, rlimit := range g.spec.Process.Rlimits {
+		if rlimit.Type == rType {
+			g.spec.Process.Rlimits[i].Hard = rHard
+			g.spec.Process.Rlimits[i].Soft = rSoft
+			return
+		}
+	}
+
+	newRlimit := rspec.POSIXRlimit{
+		Type: rType,
+		Hard: rHard,
+		Soft: rSoft,
+	}
+	g.spec.Process.Rlimits = append(g.spec.Process.Rlimits, newRlimit)
+}
+
+// RemoveProcessRlimits removes a rlimit from g.spec.Process.Rlimits.
+func (g *Generator) RemoveProcessRlimits(rType string) error {
+	if g.spec == nil {
+		return nil
+	}
+	for i, rlimit := range g.spec.Process.Rlimits {
+		if rlimit.Type == rType {
+			g.spec.Process.Rlimits = append(g.spec.Process.Rlimits[:i], g.spec.Process.Rlimits[i+1:]...)
+			return nil
+		}
+	}
+	return nil
+}
+
+// ClearProcessRlimits clear g.spec.Process.Rlimits.
+func (g *Generator) ClearProcessRlimits() {
+	if g.spec == nil {
+		return
+	}
+	g.spec.Process.Rlimits = []rspec.POSIXRlimit{}
+}
+
+// ClearProcessAdditionalGids clear g.spec.Process.AdditionalGids.
+func (g *Generator) ClearProcessAdditionalGids() {
+	if g.spec == nil {
+		return
+	}
+	g.spec.Process.User.AdditionalGids = []uint32{}
+}
+
+// AddProcessAdditionalGid adds an additional gid into g.spec.Process.AdditionalGids.
+func (g *Generator) AddProcessAdditionalGid(gid uint32) {
+	g.initSpecProcess()
+	for _, group := range g.spec.Process.User.AdditionalGids {
+		if group == gid {
+			return
+		}
+	}
+	g.spec.Process.User.AdditionalGids = append(g.spec.Process.User.AdditionalGids, gid)
+}
+
+// SetProcessSelinuxLabel sets g.spec.Process.SelinuxLabel.
+func (g *Generator) SetProcessSelinuxLabel(label string) {
+	g.initSpecProcess()
+	g.spec.Process.SelinuxLabel = label
+}
+
+// SetLinuxCgroupsPath sets g.spec.Linux.CgroupsPath.
+func (g *Generator) SetLinuxCgroupsPath(path string) {
+	g.initSpecLinux()
+	g.spec.Linux.CgroupsPath = path
+}
+
+// SetLinuxMountLabel sets g.spec.Linux.MountLabel.
+func (g *Generator) SetLinuxMountLabel(label string) {
+	g.initSpecLinux()
+	g.spec.Linux.MountLabel = label
+}
+
+// SetProcessOOMScoreAdj sets g.spec.Process.OOMScoreAdj.
+func (g *Generator) SetProcessOOMScoreAdj(adj int) {
+	g.initSpecProcess()
+	g.spec.Process.OOMScoreAdj = &adj
+}
+
+// SetLinuxResourcesCPUShares sets g.spec.Linux.Resources.CPU.Shares.
+func (g *Generator) SetLinuxResourcesCPUShares(shares uint64) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.Shares = &shares
+}
+
+// SetLinuxResourcesCPUQuota sets g.spec.Linux.Resources.CPU.Quota.
+func (g *Generator) SetLinuxResourcesCPUQuota(quota int64) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.Quota = &quota
+}
+
+// SetLinuxResourcesCPUPeriod sets g.spec.Linux.Resources.CPU.Period.
+func (g *Generator) SetLinuxResourcesCPUPeriod(period uint64) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.Period = &period
+}
+
+// SetLinuxResourcesCPURealtimeRuntime sets g.spec.Linux.Resources.CPU.RealtimeRuntime.
+func (g *Generator) SetLinuxResourcesCPURealtimeRuntime(time int64) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.RealtimeRuntime = &time
+}
+
+// SetLinuxResourcesCPURealtimePeriod sets g.spec.Linux.Resources.CPU.RealtimePeriod.
+func (g *Generator) SetLinuxResourcesCPURealtimePeriod(period uint64) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.RealtimePeriod = &period
+}
+
+// SetLinuxResourcesCPUCpus sets g.spec.Linux.Resources.CPU.Cpus.
+func (g *Generator) SetLinuxResourcesCPUCpus(cpus string) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.Cpus = cpus
+}
+
+// SetLinuxResourcesCPUMems sets g.spec.Linux.Resources.CPU.Mems.
+func (g *Generator) SetLinuxResourcesCPUMems(mems string) {
+	g.initSpecLinuxResourcesCPU()
+	g.spec.Linux.Resources.CPU.Mems = mems
+}
+
+// AddLinuxResourcesHugepageLimit adds or sets g.spec.Linux.Resources.HugepageLimits.
+func (g *Generator) AddLinuxResourcesHugepageLimit(pageSize string, limit uint64) {
+	hugepageLimit := rspec.LinuxHugepageLimit{
+		Pagesize: pageSize,
+		Limit:    limit,
+	}
+
+	g.initSpecLinuxResources()
+	for i, pageLimit := range g.spec.Linux.Resources.HugepageLimits {
+		if pageLimit.Pagesize == pageSize {
+			g.spec.Linux.Resources.HugepageLimits[i].Limit = limit
+			return
+		}
+	}
+	g.spec.Linux.Resources.HugepageLimits = append(g.spec.Linux.Resources.HugepageLimits, hugepageLimit)
+}
+
+// DropLinuxResourcesHugepageLimit drops a hugepage limit from g.spec.Linux.Resources.HugepageLimits.
+func (g *Generator) DropLinuxResourcesHugepageLimit(pageSize string) error {
+	g.initSpecLinuxResources()
+	for i, pageLimit := range g.spec.Linux.Resources.HugepageLimits {
+		if pageLimit.Pagesize == pageSize {
+			g.spec.Linux.Resources.HugepageLimits = append(g.spec.Linux.Resources.HugepageLimits[:i], g.spec.Linux.Resources.HugepageLimits[i+1:]...)
+			return nil
+		}
+	}
+
+	return nil
+}
+
+// SetLinuxResourcesMemoryLimit sets g.spec.Linux.Resources.Memory.Limit.
+func (g *Generator) SetLinuxResourcesMemoryLimit(limit int64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.Limit = &limit
+}
+
+// SetLinuxResourcesMemoryReservation sets g.spec.Linux.Resources.Memory.Reservation.
+func (g *Generator) SetLinuxResourcesMemoryReservation(reservation int64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.Reservation = &reservation
+}
+
+// SetLinuxResourcesMemorySwap sets g.spec.Linux.Resources.Memory.Swap.
+func (g *Generator) SetLinuxResourcesMemorySwap(swap int64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.Swap = &swap
+}
+
+// SetLinuxResourcesMemoryKernel sets g.spec.Linux.Resources.Memory.Kernel.
+func (g *Generator) SetLinuxResourcesMemoryKernel(kernel int64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.Kernel = &kernel
+}
+
+// SetLinuxResourcesMemoryKernelTCP sets g.spec.Linux.Resources.Memory.KernelTCP.
+func (g *Generator) SetLinuxResourcesMemoryKernelTCP(kernelTCP int64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.KernelTCP = &kernelTCP
+}
+
+// SetLinuxResourcesMemorySwappiness sets g.spec.Linux.Resources.Memory.Swappiness.
+func (g *Generator) SetLinuxResourcesMemorySwappiness(swappiness uint64) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.Swappiness = &swappiness
+}
+
+// SetLinuxResourcesMemoryDisableOOMKiller sets g.spec.Linux.Resources.Memory.DisableOOMKiller.
+func (g *Generator) SetLinuxResourcesMemoryDisableOOMKiller(disable bool) {
+	g.initSpecLinuxResourcesMemory()
+	g.spec.Linux.Resources.Memory.DisableOOMKiller = &disable
+}
+
+// SetLinuxResourcesNetworkClassID sets g.spec.Linux.Resources.Network.ClassID.
+func (g *Generator) SetLinuxResourcesNetworkClassID(classid uint32) {
+	g.initSpecLinuxResourcesNetwork()
+	g.spec.Linux.Resources.Network.ClassID = &classid
+}
+
+// AddLinuxResourcesNetworkPriorities adds or sets g.spec.Linux.Resources.Network.Priorities.
+func (g *Generator) AddLinuxResourcesNetworkPriorities(name string, prio uint32) {
+	g.initSpecLinuxResourcesNetwork()
+	for i, netPriority := range g.spec.Linux.Resources.Network.Priorities {
+		if netPriority.Name == name {
+			g.spec.Linux.Resources.Network.Priorities[i].Priority = prio
+			return
+		}
+	}
+	interfacePrio := new(rspec.LinuxInterfacePriority)
+	interfacePrio.Name = name
+	interfacePrio.Priority = prio
+	g.spec.Linux.Resources.Network.Priorities = append(g.spec.Linux.Resources.Network.Priorities, *interfacePrio)
+}
+
+// DropLinuxResourcesNetworkPriorities drops one item from g.spec.Linux.Resources.Network.Priorities.
+func (g *Generator) DropLinuxResourcesNetworkPriorities(name string) {
+	g.initSpecLinuxResourcesNetwork()
+	for i, netPriority := range g.spec.Linux.Resources.Network.Priorities {
+		if netPriority.Name == name {
+			g.spec.Linux.Resources.Network.Priorities = append(g.spec.Linux.Resources.Network.Priorities[:i], g.spec.Linux.Resources.Network.Priorities[i+1:]...)
+			return
+		}
+	}
+}
+
+// SetLinuxResourcesPidsLimit sets g.spec.Linux.Resources.Pids.Limit.
+func (g *Generator) SetLinuxResourcesPidsLimit(limit int64) {
+	g.initSpecLinuxResourcesPids()
+	g.spec.Linux.Resources.Pids.Limit = limit
+}
+
+// ClearLinuxSysctl clears g.spec.Linux.Sysctl.
+func (g *Generator) ClearLinuxSysctl() {
+	if g.spec == nil || g.spec.Linux == nil {
+		return
+	}
+	g.spec.Linux.Sysctl = make(map[string]string)
+}
+
+// AddLinuxSysctl adds a new sysctl config into g.spec.Linux.Sysctl.
+func (g *Generator) AddLinuxSysctl(key, value string) {
+	g.initSpecLinuxSysctl()
+	g.spec.Linux.Sysctl[key] = value
+}
+
+// RemoveLinuxSysctl removes a sysctl config from g.spec.Linux.Sysctl.
+func (g *Generator) RemoveLinuxSysctl(key string) {
+	if g.spec == nil || g.spec.Linux == nil || g.spec.Linux.Sysctl == nil {
+		return
+	}
+	delete(g.spec.Linux.Sysctl, key)
+}
+
+// ClearLinuxUIDMappings clear g.spec.Linux.UIDMappings.
+func (g *Generator) ClearLinuxUIDMappings() {
+	if g.spec == nil || g.spec.Linux == nil {
+		return
+	}
+	g.spec.Linux.UIDMappings = []rspec.LinuxIDMapping{}
+}
+
+// AddLinuxUIDMapping adds uidMap into g.spec.Linux.UIDMappings.
+func (g *Generator) AddLinuxUIDMapping(hid, cid, size uint32) {
+	idMapping := rspec.LinuxIDMapping{
+		HostID:      hid,
+		ContainerID: cid,
+		Size:        size,
+	}
+
+	g.initSpecLinux()
+	g.spec.Linux.UIDMappings = append(g.spec.Linux.UIDMappings, idMapping)
+}
+
+// ClearLinuxGIDMappings clear g.spec.Linux.GIDMappings.
+func (g *Generator) ClearLinuxGIDMappings() {
+	if g.spec == nil || g.spec.Linux == nil {
+		return
+	}
+	g.spec.Linux.GIDMappings = []rspec.LinuxIDMapping{}
+}
+
+// AddLinuxGIDMapping adds gidMap into g.spec.Linux.GIDMappings.
+func (g *Generator) AddLinuxGIDMapping(hid, cid, size uint32) {
+	idMapping := rspec.LinuxIDMapping{
+		HostID:      hid,
+		ContainerID: cid,
+		Size:        size,
+	}
+
+	g.initSpecLinux()
+	g.spec.Linux.GIDMappings = append(g.spec.Linux.GIDMappings, idMapping)
+}
+
+// SetLinuxRootPropagation sets g.spec.Linux.RootfsPropagation.
+func (g *Generator) SetLinuxRootPropagation(rp string) error {
+	switch rp {
+	case "":
+	case "private":
+	case "rprivate":
+	case "slave":
+	case "rslave":
+	case "shared":
+	case "rshared":
+	default:
+		return fmt.Errorf("rootfs-propagation must be empty or one of private|rprivate|slave|rslave|shared|rshared")
+	}
+	g.initSpecLinux()
+	g.spec.Linux.RootfsPropagation = rp
+	return nil
+}
+
+// ClearPreStartHooks clear g.spec.Hooks.Prestart.
+func (g *Generator) ClearPreStartHooks() {
+	if g.spec == nil {
+		return
+	}
+	if g.spec.Hooks == nil {
+		return
+	}
+	g.spec.Hooks.Prestart = []rspec.Hook{}
+}
+
+// AddPreStartHook add a prestart hook into g.spec.Hooks.Prestart.
+func (g *Generator) AddPreStartHook(path string, args []string) {
+	g.initSpecHooks()
+	hook := rspec.Hook{Path: path, Args: args}
+	for i, hook := range g.spec.Hooks.Prestart {
+		if hook.Path == path {
+			g.spec.Hooks.Prestart[i] = hook
+			return
+		}
+	}
+	g.spec.Hooks.Prestart = append(g.spec.Hooks.Prestart, hook)
+}
+
+// AddPreStartHookEnv adds envs of a prestart hook into g.spec.Hooks.Prestart.
+func (g *Generator) AddPreStartHookEnv(path string, envs []string) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Prestart {
+		if hook.Path == path {
+			g.spec.Hooks.Prestart[i].Env = envs
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Env: envs}
+	g.spec.Hooks.Prestart = append(g.spec.Hooks.Prestart, hook)
+}
+
+// AddPreStartHookTimeout adds timeout of a prestart hook into g.spec.Hooks.Prestart.
+func (g *Generator) AddPreStartHookTimeout(path string, timeout int) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Prestart {
+		if hook.Path == path {
+			g.spec.Hooks.Prestart[i].Timeout = &timeout
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Timeout: &timeout}
+	g.spec.Hooks.Prestart = append(g.spec.Hooks.Prestart, hook)
+}
+
+// ClearPostStopHooks clear g.spec.Hooks.Poststop.
+func (g *Generator) ClearPostStopHooks() {
+	if g.spec == nil {
+		return
+	}
+	if g.spec.Hooks == nil {
+		return
+	}
+	g.spec.Hooks.Poststop = []rspec.Hook{}
+}
+
+// AddPostStopHook adds a poststop hook into g.spec.Hooks.Poststop.
+func (g *Generator) AddPostStopHook(path string, args []string) {
+	g.initSpecHooks()
+	hook := rspec.Hook{Path: path, Args: args}
+	for i, hook := range g.spec.Hooks.Poststop {
+		if hook.Path == path {
+			g.spec.Hooks.Poststop[i] = hook
+			return
+		}
+	}
+	g.spec.Hooks.Poststop = append(g.spec.Hooks.Poststop, hook)
+}
+
+// AddPostStopHookEnv adds envs of a poststop hook into g.spec.Hooks.Poststop.
+func (g *Generator) AddPostStopHookEnv(path string, envs []string) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Poststop {
+		if hook.Path == path {
+			g.spec.Hooks.Poststop[i].Env = envs
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Env: envs}
+	g.spec.Hooks.Poststop = append(g.spec.Hooks.Poststop, hook)
+}
+
+// AddPostStopHookTimeout adds timeout of a poststop hook into g.spec.Hooks.Poststop.
+func (g *Generator) AddPostStopHookTimeout(path string, timeout int) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Poststop {
+		if hook.Path == path {
+			g.spec.Hooks.Poststop[i].Timeout = &timeout
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Timeout: &timeout}
+	g.spec.Hooks.Poststop = append(g.spec.Hooks.Poststop, hook)
+}
+
+// ClearPostStartHooks clear g.spec.Hooks.Poststart.
+func (g *Generator) ClearPostStartHooks() {
+	if g.spec == nil {
+		return
+	}
+	if g.spec.Hooks == nil {
+		return
+	}
+	g.spec.Hooks.Poststart = []rspec.Hook{}
+}
+
+// AddPostStartHook adds a poststart hook into g.spec.Hooks.Poststart.
+func (g *Generator) AddPostStartHook(path string, args []string) {
+	g.initSpecHooks()
+	hook := rspec.Hook{Path: path, Args: args}
+	for i, hook := range g.spec.Hooks.Poststart {
+		if hook.Path == path {
+			g.spec.Hooks.Poststart[i] = hook
+			return
+		}
+	}
+	g.spec.Hooks.Poststart = append(g.spec.Hooks.Poststart, hook)
+}
+
+// AddPostStartHookEnv adds envs of a poststart hook into g.spec.Hooks.Poststart.
+func (g *Generator) AddPostStartHookEnv(path string, envs []string) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Poststart {
+		if hook.Path == path {
+			g.spec.Hooks.Poststart[i].Env = envs
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Env: envs}
+	g.spec.Hooks.Poststart = append(g.spec.Hooks.Poststart, hook)
+}
+
+// AddPostStartHookTimeout adds timeout of a poststart hook into g.spec.Hooks.Poststart.
+func (g *Generator) AddPostStartHookTimeout(path string, timeout int) {
+	g.initSpecHooks()
+	for i, hook := range g.spec.Hooks.Poststart {
+		if hook.Path == path {
+			g.spec.Hooks.Poststart[i].Timeout = &timeout
+			return
+		}
+	}
+	hook := rspec.Hook{Path: path, Timeout: &timeout}
+	g.spec.Hooks.Poststart = append(g.spec.Hooks.Poststart, hook)
+}
+
+// AddTmpfsMount adds a tmpfs mount into g.spec.Mounts.
+func (g *Generator) AddTmpfsMount(dest string, options []string) {
+	mnt := rspec.Mount{
+		Destination: dest,
+		Type:        "tmpfs",
+		Source:      "tmpfs",
+		Options:     options,
+	}
+
+	g.initSpec()
+	g.spec.Mounts = append(g.spec.Mounts, mnt)
+}
+
+// AddCgroupsMount adds a cgroup mount into g.spec.Mounts.
+func (g *Generator) AddCgroupsMount(mountCgroupOption string) error {
+	switch mountCgroupOption {
+	case "ro":
+	case "rw":
+	case "no":
+		return nil
+	default:
+		return fmt.Errorf("--mount-cgroups should be one of (ro,rw,no)")
+	}
+
+	mnt := rspec.Mount{
+		Destination: "/sys/fs/cgroup",
+		Type:        "cgroup",
+		Source:      "cgroup",
+		Options:     []string{"nosuid", "noexec", "nodev", "relatime", mountCgroupOption},
+	}
+	g.initSpec()
+	g.spec.Mounts = append(g.spec.Mounts, mnt)
+
+	return nil
+}
+
+// AddBindMount adds a bind mount into g.spec.Mounts.
+func (g *Generator) AddBindMount(source, dest string, options []string) {
+	if len(options) == 0 {
+		options = []string{"rw"}
+	}
+
+	// We have to make sure that there is a bind option set, otherwise it won't
+	// be an actual bindmount.
+	foundBindOption := false
+	for _, opt := range options {
+		if opt == "bind" || opt == "rbind" {
+			foundBindOption = true
+			break
+		}
+	}
+	if !foundBindOption {
+		options = append(options, "bind")
+	}
+
+	mnt := rspec.Mount{
+		Destination: dest,
+		Type:        "bind",
+		Source:      source,
+		Options:     options,
+	}
+	g.initSpec()
+	g.spec.Mounts = append(g.spec.Mounts, mnt)
+}
+
+// SetupPrivileged sets up the privilege-related fields inside g.spec.
+func (g *Generator) SetupPrivileged(privileged bool) {
+	if privileged { // Add all capabilities in privileged mode.
+		var finalCapList []string
+		for _, cap := range capability.List() {
+			if g.HostSpecific && cap > validate.LastCap() {
+				continue
+			}
+			finalCapList = append(finalCapList, fmt.Sprintf("CAP_%s", strings.ToUpper(cap.String())))
+		}
+		g.initSpecLinux()
+		g.initSpecProcessCapabilities()
+		g.ClearProcessCapabilities()
+		g.spec.Process.Capabilities.Bounding = append(g.spec.Process.Capabilities.Bounding, finalCapList...)
+		g.spec.Process.Capabilities.Effective = append(g.spec.Process.Capabilities.Effective, finalCapList...)
+		g.spec.Process.Capabilities.Inheritable = append(g.spec.Process.Capabilities.Inheritable, finalCapList...)
+		g.spec.Process.Capabilities.Permitted = append(g.spec.Process.Capabilities.Permitted, finalCapList...)
+		g.spec.Process.Capabilities.Ambient = append(g.spec.Process.Capabilities.Ambient, finalCapList...)
+		g.spec.Process.SelinuxLabel = ""
+		g.spec.Process.ApparmorProfile = ""
+		g.spec.Linux.Seccomp = nil
+	}
+}
+
+// ClearProcessCapabilities clear g.spec.Process.Capabilities.
+func (g *Generator) ClearProcessCapabilities() {
+	if g.spec == nil {
+		return
+	}
+	g.spec.Process.Capabilities.Bounding = []string{}
+	g.spec.Process.Capabilities.Effective = []string{}
+	g.spec.Process.Capabilities.Inheritable = []string{}
+	g.spec.Process.Capabilities.Permitted = []string{}
+	g.spec.Process.Capabilities.Ambient = []string{}
+}
+
+// AddProcessCapability adds a process capability into g.spec.Process.Capabilities.
+func (g *Generator) AddProcessCapability(c string) error {
+	cp := strings.ToUpper(c)
+	if err := validate.CapValid(cp, g.HostSpecific); err != nil {
+		return err
+	}
+
+	g.initSpecProcessCapabilities()
+
+	var foundBounding bool
+	for _, cap := range g.spec.Process.Capabilities.Bounding {
+		if strings.ToUpper(cap) == cp {
+			foundBounding = true
+			break
+		}
+	}
+	if !foundBounding {
+		g.spec.Process.Capabilities.Bounding = append(g.spec.Process.Capabilities.Bounding, cp)
+	}
+
+	var foundEffective bool
+	for _, cap := range g.spec.Process.Capabilities.Effective {
+		if strings.ToUpper(cap) == cp {
+			foundEffective = true
+			break
+		}
+	}
+	if !foundEffective {
+		g.spec.Process.Capabilities.Effective = append(g.spec.Process.Capabilities.Effective, cp)
+	}
+
+	var foundInheritable bool
+	for _, cap := range g.spec.Process.Capabilities.Inheritable {
+		if strings.ToUpper(cap) == cp {
+			foundInheritable = true
+			break
+		}
+	}
+	if !foundInheritable {
+		g.spec.Process.Capabilities.Inheritable = append(g.spec.Process.Capabilities.Inheritable, cp)
+	}
+
+	var foundPermitted bool
+	for _, cap := range g.spec.Process.Capabilities.Permitted {
+		if strings.ToUpper(cap) == cp {
+			foundPermitted = true
+			break
+		}
+	}
+	if !foundPermitted {
+		g.spec.Process.Capabilities.Permitted = append(g.spec.Process.Capabilities.Permitted, cp)
+	}
+
+	var foundAmbient bool
+	for _, cap := range g.spec.Process.Capabilities.Ambient {
+		if strings.ToUpper(cap) == cp {
+			foundAmbient = true
+			break
+		}
+	}
+	if !foundAmbient {
+		g.spec.Process.Capabilities.Ambient = append(g.spec.Process.Capabilities.Ambient, cp)
+	}
+
+	return nil
+}
+
+// DropProcessCapability drops a process capability from g.spec.Process.Capabilities.
+func (g *Generator) DropProcessCapability(c string) error {
+	cp := strings.ToUpper(c)
+	if err := validate.CapValid(cp, g.HostSpecific); err != nil {
+		return err
+	}
+
+	g.initSpecProcessCapabilities()
+
+	// we don't care about order...and this is way faster...
+	removeFunc := func(s []string, i int) []string {
+		s[i] = s[len(s)-1]
+		return s[:len(s)-1]
+	}
+
+	for i, cap := range g.spec.Process.Capabilities.Bounding {
+		if strings.ToUpper(cap) == cp {
+			g.spec.Process.Capabilities.Bounding = removeFunc(g.spec.Process.Capabilities.Bounding, i)
+		}
+	}
+
+	for i, cap := range g.spec.Process.Capabilities.Effective {
+		if strings.ToUpper(cap) == cp {
+			g.spec.Process.Capabilities.Effective = removeFunc(g.spec.Process.Capabilities.Effective, i)
+		}
+	}
+
+	for i, cap := range g.spec.Process.Capabilities.Inheritable {
+		if strings.ToUpper(cap) == cp {
+			g.spec.Process.Capabilities.Inheritable = removeFunc(g.spec.Process.Capabilities.Inheritable, i)
+		}
+	}
+
+	for i, cap := range g.spec.Process.Capabilities.Permitted {
+		if strings.ToUpper(cap) == cp {
+			g.spec.Process.Capabilities.Permitted = removeFunc(g.spec.Process.Capabilities.Permitted, i)
+		}
+	}
+
+	for i, cap := range g.spec.Process.Capabilities.Ambient {
+		if strings.ToUpper(cap) == cp {
+			g.spec.Process.Capabilities.Ambient = removeFunc(g.spec.Process.Capabilities.Ambient, i)
+		}
+	}
+
+	return nil
+}
+
+func mapStrToNamespace(ns string, path string) (rspec.LinuxNamespace, error) {
+	switch ns {
+	case "network":
+		return rspec.LinuxNamespace{Type: rspec.NetworkNamespace, Path: path}, nil
+	case "pid":
+		return rspec.LinuxNamespace{Type: rspec.PIDNamespace, Path: path}, nil
+	case "mount":
+		return rspec.LinuxNamespace{Type: rspec.MountNamespace, Path: path}, nil
+	case "ipc":
+		return rspec.LinuxNamespace{Type: rspec.IPCNamespace, Path: path}, nil
+	case "uts":
+		return rspec.LinuxNamespace{Type: rspec.UTSNamespace, Path: path}, nil
+	case "user":
+		return rspec.LinuxNamespace{Type: rspec.UserNamespace, Path: path}, nil
+	case "cgroup":
+		return rspec.LinuxNamespace{Type: rspec.CgroupNamespace, Path: path}, nil
+	default:
+		return rspec.LinuxNamespace{}, fmt.Errorf("unrecognized namespace %q", ns)
+	}
+}
+
+// ClearLinuxNamespaces clear g.spec.Linux.Namespaces.
+func (g *Generator) ClearLinuxNamespaces() {
+	if g.spec == nil || g.spec.Linux == nil {
+		return
+	}
+	g.spec.Linux.Namespaces = []rspec.LinuxNamespace{}
+}
+
+// AddOrReplaceLinuxNamespace adds or replaces a namespace inside
+// g.spec.Linux.Namespaces.
+func (g *Generator) AddOrReplaceLinuxNamespace(ns string, path string) error {
+	namespace, err := mapStrToNamespace(ns, path)
+	if err != nil {
+		return err
+	}
+
+	g.initSpecLinux()
+	for i, ns := range g.spec.Linux.Namespaces {
+		if ns.Type == namespace.Type {
+			g.spec.Linux.Namespaces[i] = namespace
+			return nil
+		}
+	}
+	g.spec.Linux.Namespaces = append(g.spec.Linux.Namespaces, namespace)
+	return nil
+}
+
+// RemoveLinuxNamespace removes a namespace from g.spec.Linux.Namespaces.
+func (g *Generator) RemoveLinuxNamespace(ns string) error {
+	namespace, err := mapStrToNamespace(ns, "")
+	if err != nil {
+		return err
+	}
+
+	if g.spec == nil || g.spec.Linux == nil {
+		return nil
+	}
+	for i, ns := range g.spec.Linux.Namespaces {
+		if ns.Type == namespace.Type {
+			g.spec.Linux.Namespaces = append(g.spec.Linux.Namespaces[:i], g.spec.Linux.Namespaces[i+1:]...)
+			return nil
+		}
+	}
+	return nil
+}
+
+// AddDevice - add a device into g.spec.Linux.Devices
+func (g *Generator) AddDevice(device rspec.LinuxDevice) {
+	g.initSpecLinux()
+
+	for i, dev := range g.spec.Linux.Devices {
+		if dev.Path == device.Path {
+			g.spec.Linux.Devices[i] = device
+			return
+		}
+		if dev.Type == device.Type && dev.Major == device.Major && dev.Minor == device.Minor {
+			fmt.Fprintln(os.Stderr, "WARNING: The same type, major and minor should not be used for multiple devices.")
+		}
+	}
+
+	g.spec.Linux.Devices = append(g.spec.Linux.Devices, device)
+}
+
+// RemoveDevice remove a device from g.spec.Linux.Devices
+func (g *Generator) RemoveDevice(path string) error {
+	if g.spec == nil || g.spec.Linux == nil || g.spec.Linux.Devices == nil {
+		return nil
+	}
+
+	for i, device := range g.spec.Linux.Devices {
+		if device.Path == path {
+			g.spec.Linux.Devices = append(g.spec.Linux.Devices[:i], g.spec.Linux.Devices[i+1:]...)
+			return nil
+		}
+	}
+	return nil
+}
+
+// ClearLinuxDevices clears g.spec.Linux.Devices
+func (g *Generator) ClearLinuxDevices() {
+	if g.spec == nil || g.spec.Linux == nil || g.spec.Linux.Devices == nil {
+		return
+	}
+
+	g.spec.Linux.Devices = []rspec.LinuxDevice{}
+}
+
+// strPtr returns the pointer pointing to the string s.
+func strPtr(s string) *string { return &s }
+
+// SetSyscallAction adds rules for syscalls with the specified action
+func (g *Generator) SetSyscallAction(arguments seccomp.SyscallOpts) error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.ParseSyscallFlag(arguments, g.spec.Linux.Seccomp)
+}
+
+// SetDefaultSeccompAction sets the default action for all syscalls not defined
+// and then removes any syscall rules with this action already specified.
+func (g *Generator) SetDefaultSeccompAction(action string) error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.ParseDefaultAction(action, g.spec.Linux.Seccomp)
+}
+
+// SetDefaultSeccompActionForce only sets the default action for all syscalls not defined
+func (g *Generator) SetDefaultSeccompActionForce(action string) error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.ParseDefaultActionForce(action, g.spec.Linux.Seccomp)
+}
+
+// SetSeccompArchitecture sets the supported seccomp architectures
+func (g *Generator) SetSeccompArchitecture(architecture string) error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.ParseArchitectureFlag(architecture, g.spec.Linux.Seccomp)
+}
+
+// RemoveSeccompRule removes rules for any specified syscalls
+func (g *Generator) RemoveSeccompRule(arguments string) error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.RemoveAction(arguments, g.spec.Linux.Seccomp)
+}
+
+// RemoveAllSeccompRules removes all syscall rules
+func (g *Generator) RemoveAllSeccompRules() error {
+	g.initSpecLinuxSeccomp()
+	return seccomp.RemoveAllSeccompRules(g.spec.Linux.Seccomp)
+}
+
+// AddLinuxMaskedPaths adds masked paths into g.spec.Linux.MaskedPaths.
+func (g *Generator) AddLinuxMaskedPaths(path string) {
+	g.initSpecLinux()
+	g.spec.Linux.MaskedPaths = append(g.spec.Linux.MaskedPaths, path)
+}
+
+// AddLinuxReadonlyPaths adds readonly paths into g.spec.Linux.MaskedPaths.
+func (g *Generator) AddLinuxReadonlyPaths(path string) {
+	g.initSpecLinux()
+	g.spec.Linux.ReadonlyPaths = append(g.spec.Linux.ReadonlyPaths, path)
+}