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//go:build !windows
// +build !windows
package buildkit
import (
"os"
"path/filepath"
"strconv"
"sync"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/libnetwork"
"github.com/moby/buildkit/executor"
"github.com/moby/buildkit/executor/oci"
"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"
"github.com/sirupsen/logrus"
)
const networkName = "bridge"
func newExecutor(root, cgroupParent string, net libnetwork.NetworkController, 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{NetworkController: 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 {
logrus.WithError(err).Errorf("failed to delete old network state: %v", fp)
}
}
}
return runcexecutor.New(runcexecutor.Opt{
Root: filepath.Join(root, "executor"),
CommandCandidates: []string{"runc"},
DefaultCgroupParent: cgroupParent,
Rootless: rootless,
NoPivot: os.Getenv("DOCKER_RAMDISK") != "",
IdentityMapping: idmap,
DNS: dnsConfig,
ApparmorProfile: apparmorProfile,
}, networkProviders)
}
type bridgeProvider struct {
libnetwork.NetworkController
Root string
}
func (p *bridgeProvider) New() (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.NetworkController, n)
})
return iface, 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.NetworkController, n libnetwork.Network) {
defer close(iface.ready)
id := identity.NewID()
ep, err := n.CreateEndpoint(id, libnetwork.CreateOptionDisableResolution())
if err != nil {
iface.err = err
return
}
sbx, err := c.NewSandbox(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(sbx); err != nil {
iface.err = err
return
}
iface.sbx = sbx
iface.ep = ep
}
func (iface *lnInterface) Set(s *specs.Spec) error {
<-iface.ready
if iface.err != nil {
logrus.WithError(iface.err).Error("failed to set networking spec")
return iface.err
}
shortNetCtlrID := stringid.TruncateID(iface.provider.NetworkController.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().Daemon.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(); err != nil {
logrus.WithError(err).Errorf("failed to delete builder network sandbox")
}
if err := os.RemoveAll(filepath.Join(iface.provider.Root, iface.sbx.ContainerID())); err != nil {
logrus.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: cfg.DNS,
SearchDomains: cfg.DNSSearch,
Options: cfg.DNSOptions,
}
}
return nil
}
|
