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package buildkit
import (
"context"
"net"
"os"
"path/filepath"
"strconv"
"sync"
"github.com/containerd/log"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/libnetwork"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/stringid"
"github.com/moby/buildkit/executor"
"github.com/moby/buildkit/executor/oci"
"github.com/moby/buildkit/executor/resources"
resourcestypes "github.com/moby/buildkit/executor/resources/types"
"github.com/moby/buildkit/executor/runcexecutor"
"github.com/moby/buildkit/identity"
"github.com/moby/buildkit/solver/pb"
"github.com/moby/buildkit/util/network"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
const networkName = "bridge"
func newExecutor(root, cgroupParent string, net *libnetwork.Controller, dnsConfig *oci.DNSConfig, rootless bool, idmap idtools.IdentityMapping, apparmorProfile string) (executor.Executor, error) {
netRoot := filepath.Join(root, "net")
networkProviders := map[pb.NetMode]network.Provider{
pb.NetMode_UNSET: &bridgeProvider{Controller: net, Root: netRoot},
pb.NetMode_HOST: network.NewHostProvider(),
pb.NetMode_NONE: network.NewNoneProvider(),
}
// make sure net state directory is cleared from previous state
fis, err := os.ReadDir(netRoot)
if err == nil {
for _, fi := range fis {
fp := filepath.Join(netRoot, fi.Name())
if err := os.RemoveAll(fp); err != nil {
log.G(context.TODO()).WithError(err).Errorf("failed to delete old network state: %v", fp)
}
}
}
// Returning a non-nil but empty *IdentityMapping breaks BuildKit:
// https://github.com/moby/moby/pull/39444
pidmap := &idmap
if idmap.Empty() {
pidmap = nil
}
rm, err := resources.NewMonitor()
if err != nil {
return nil, err
}
runcCmds := []string{"runc"}
// TODO: FIXME: testing env var, replace with something better or remove in a major version or two
if runcOverride := os.Getenv("DOCKER_BUILDKIT_RUNC_COMMAND"); runcOverride != "" {
runcCmds = []string{runcOverride}
}
return runcexecutor.New(runcexecutor.Opt{
Root: filepath.Join(root, "executor"),
CommandCandidates: runcCmds,
DefaultCgroupParent: cgroupParent,
Rootless: rootless,
NoPivot: os.Getenv("DOCKER_RAMDISK") != "",
IdentityMapping: pidmap,
DNS: dnsConfig,
ApparmorProfile: apparmorProfile,
ResourceMonitor: rm,
}, networkProviders)
}
type bridgeProvider struct {
*libnetwork.Controller
Root string
}
func (p *bridgeProvider) New(ctx context.Context, hostname string) (network.Namespace, error) {
n, err := p.NetworkByName(networkName)
if err != nil {
return nil, err
}
iface := &lnInterface{ready: make(chan struct{}), provider: p}
iface.Once.Do(func() {
go iface.init(p.Controller, n)
})
return iface, nil
}
func (p *bridgeProvider) Close() error {
return nil
}
type lnInterface struct {
ep *libnetwork.Endpoint
sbx *libnetwork.Sandbox
sync.Once
err error
ready chan struct{}
provider *bridgeProvider
}
func (iface *lnInterface) init(c *libnetwork.Controller, n *libnetwork.Network) {
defer close(iface.ready)
id := identity.NewID()
ep, err := n.CreateEndpoint(context.TODO(), id, libnetwork.CreateOptionDisableResolution())
if err != nil {
iface.err = err
return
}
sbx, err := c.NewSandbox(context.TODO(), id, libnetwork.OptionUseExternalKey(), libnetwork.OptionHostsPath(filepath.Join(iface.provider.Root, id, "hosts")),
libnetwork.OptionResolvConfPath(filepath.Join(iface.provider.Root, id, "resolv.conf")))
if err != nil {
iface.err = err
return
}
if err := ep.Join(context.TODO(), sbx); err != nil {
iface.err = err
return
}
iface.sbx = sbx
iface.ep = ep
}
// TODO(neersighted): Unstub Sample(), and collect data from the libnetwork Endpoint.
func (iface *lnInterface) Sample() (*resourcestypes.NetworkSample, error) {
return &resourcestypes.NetworkSample{}, nil
}
func (iface *lnInterface) Set(s *specs.Spec) error {
<-iface.ready
if iface.err != nil {
log.G(context.TODO()).WithError(iface.err).Error("failed to set networking spec")
return iface.err
}
shortNetCtlrID := stringid.TruncateID(iface.provider.Controller.ID())
// attach netns to bridge within the container namespace, using reexec in a prestart hook
s.Hooks = &specs.Hooks{
Prestart: []specs.Hook{{
Path: filepath.Join("/proc", strconv.Itoa(os.Getpid()), "exe"),
Args: []string{"libnetwork-setkey", "-exec-root=" + iface.provider.Config().ExecRoot, iface.sbx.ContainerID(), shortNetCtlrID},
}},
}
return nil
}
func (iface *lnInterface) Close() error {
<-iface.ready
if iface.sbx != nil {
go func() {
if err := iface.sbx.Delete(context.TODO()); err != nil {
log.G(context.TODO()).WithError(err).Errorf("failed to delete builder network sandbox")
}
if err := os.RemoveAll(filepath.Join(iface.provider.Root, iface.sbx.ContainerID())); err != nil {
log.G(context.TODO()).WithError(err).Errorf("failed to delete builder sandbox directory")
}
}()
}
return iface.err
}
func getDNSConfig(cfg config.DNSConfig) *oci.DNSConfig {
if cfg.DNS != nil || cfg.DNSSearch != nil || cfg.DNSOptions != nil {
return &oci.DNSConfig{
Nameservers: ipAddresses(cfg.DNS),
SearchDomains: cfg.DNSSearch,
Options: cfg.DNSOptions,
}
}
return nil
}
func ipAddresses(ips []net.IP) []string {
var addrs []string
for _, ip := range ips {
addrs = append(addrs, ip.String())
}
return addrs
}
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