func setDevices(s *specs.Spec, c *container.Container) error {
// Build lists of devices allowed and created within the container.
var devs []specs.Device
devPermissions := s.Linux.Resources.Devices
if c.HostConfig.Privileged {
hostDevices, err := devices.HostDevices()
if err != nil {
return err
}
for _, d := range hostDevices {
devs = append(devs, oci.Device(d))
}
rwm := "rwm"
devPermissions = []specs.DeviceCgroup{
{
Allow: true,
Access: &rwm,
},
}
} else {
for _, deviceMapping := range c.HostConfig.Devices {
d, dPermissions, err := oci.DevicesFromPath(deviceMapping.PathOnHost, deviceMapping.PathInContainer, deviceMapping.CgroupPermissions)
if err != nil {
return err
}
devs = append(devs, d...)
devPermissions = append(devPermissions, dPermissions...)
}
}
s.Linux.Devices = append(s.Linux.Devices, devs...)
s.Linux.Resources.Devices = devPermissions
return nil
}
// InitSpec creates an OCI spec from the plugin's config.
func (p *Plugin) InitSpec(s specs.Spec) (*specs.Spec, error) {
s.Root = specs.Root{
Path: p.Rootfs,
Readonly: false, // TODO: all plugins should be readonly? settable in config?
}
userMounts := make(map[string]struct{}, len(p.PluginObj.Settings.Mounts))
for _, m := range p.PluginObj.Settings.Mounts {
userMounts[m.Destination] = struct{}{}
}
if err := os.MkdirAll(p.runtimeSourcePath, 0755); err != nil {
return nil, err
}
mounts := append(p.PluginObj.Config.Mounts, types.PluginMount{
Source: &p.runtimeSourcePath,
Destination: defaultPluginRuntimeDestination,
Type: "bind",
Options: []string{"rbind", "rshared"},
})
if p.PluginObj.Config.Network.Type != "" {
// TODO: if net == bridge, use libnetwork controller to create a new plugin-specific bridge, bind mount /etc/hosts and /etc/resolv.conf look at the docker code (allocateNetwork, initialize)
if p.PluginObj.Config.Network.Type == "host" {
oci.RemoveNamespace(&s, specs.NamespaceType("network"))
}
etcHosts := "/etc/hosts"
resolvConf := "/etc/resolv.conf"
mounts = append(mounts,
types.PluginMount{
Source: &etcHosts,
Destination: etcHosts,
Type: "bind",
Options: []string{"rbind", "ro"},
},
types.PluginMount{
Source: &resolvConf,
Destination: resolvConf,
Type: "bind",
Options: []string{"rbind", "ro"},
})
}
for _, mnt := range mounts {
m := specs.Mount{
Destination: mnt.Destination,
Type: mnt.Type,
Options: mnt.Options,
}
if mnt.Source == nil {
return nil, errors.New("mount source is not specified")
}
m.Source = *mnt.Source
s.Mounts = append(s.Mounts, m)
}
for i, m := range s.Mounts {
if strings.HasPrefix(m.Destination, "/dev/") {
if _, ok := userMounts[m.Destination]; ok {
s.Mounts = append(s.Mounts[:i], s.Mounts[i+1:]...)
}
}
}
if p.PluginObj.Config.PropagatedMount != "" {
p.PropagatedMount = filepath.Join(p.Rootfs, p.PluginObj.Config.PropagatedMount)
s.Linux.RootfsPropagation = "rshared"
}
if p.PluginObj.Config.Linux.DeviceCreation {
rwm := "rwm"
s.Linux.Resources.Devices = []specs.DeviceCgroup{{Allow: true, Access: &rwm}}
}
for _, dev := range p.PluginObj.Settings.Devices {
path := *dev.Path
d, dPermissions, err := oci.DevicesFromPath(path, path, "rwm")
if err != nil {
return nil, err
}
s.Linux.Devices = append(s.Linux.Devices, d...)
s.Linux.Resources.Devices = append(s.Linux.Resources.Devices, dPermissions...)
}
envs := make([]string, 1, len(p.PluginObj.Settings.Env)+1)
envs[0] = "PATH=" + system.DefaultPathEnv
envs = append(envs, p.PluginObj.Settings.Env...)
args := append(p.PluginObj.Config.Entrypoint, p.PluginObj.Settings.Args...)
cwd := p.PluginObj.Config.Workdir
if len(cwd) == 0 {
cwd = "/"
}
s.Process.Terminal = false
s.Process.Args = args
s.Process.Cwd = cwd
s.Process.Env = envs
s.Process.Capabilities = append(s.Process.Capabilities, p.PluginObj.Config.Linux.Capabilities...)
return &s, nil
}