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|
package runcexecutor
import (
"context"
"io"
"os"
"syscall"
"github.com/containerd/console"
runc "github.com/containerd/go-runc"
"github.com/moby/buildkit/executor"
"github.com/moby/buildkit/util/bklog"
"github.com/moby/sys/signal"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
func updateRuncFieldsForHostOS(runtime *runc.Runc) {
// PdeathSignal only supported on unix platforms
runtime.PdeathSignal = syscall.SIGKILL // this can still leak the process
}
func (w *runcExecutor) run(ctx context.Context, id, bundle string, process executor.ProcessInfo, started func(), keep bool) error {
killer := newRunProcKiller(w.runc, id)
return w.callWithIO(ctx, id, bundle, process, started, killer, func(ctx context.Context, started chan<- int, io runc.IO, pidfile string) error {
extraArgs := []string{}
if keep {
extraArgs = append(extraArgs, "--keep")
}
_, err := w.runc.Run(ctx, id, bundle, &runc.CreateOpts{
NoPivot: w.noPivot,
Started: started,
IO: io,
ExtraArgs: extraArgs,
})
return err
})
}
func (w *runcExecutor) exec(ctx context.Context, id, bundle string, specsProcess *specs.Process, process executor.ProcessInfo, started func()) error {
killer, err := newExecProcKiller(w.runc, id)
if err != nil {
return errors.Wrap(err, "failed to initialize process killer")
}
defer killer.Cleanup()
return w.callWithIO(ctx, id, bundle, process, started, killer, func(ctx context.Context, started chan<- int, io runc.IO, pidfile string) error {
return w.runc.Exec(ctx, id, *specsProcess, &runc.ExecOpts{
Started: started,
IO: io,
PidFile: pidfile,
})
})
}
type runcCall func(ctx context.Context, started chan<- int, io runc.IO, pidfile string) error
func (w *runcExecutor) callWithIO(ctx context.Context, id, bundle string, process executor.ProcessInfo, started func(), killer procKiller, call runcCall) error {
runcProcess, ctx := runcProcessHandle(ctx, killer)
defer runcProcess.Release()
eg, ctx := errgroup.WithContext(ctx)
defer func() {
if err := eg.Wait(); err != nil && !errors.Is(err, context.Canceled) {
bklog.G(ctx).Errorf("runc process monitoring error: %s", err)
}
}()
defer runcProcess.Shutdown()
startedCh := make(chan int, 1)
eg.Go(func() error {
return runcProcess.WaitForStart(ctx, startedCh, started)
})
eg.Go(func() error {
return handleSignals(ctx, runcProcess, process.Signal)
})
if !process.Meta.Tty {
return call(ctx, startedCh, &forwardIO{stdin: process.Stdin, stdout: process.Stdout, stderr: process.Stderr}, killer.pidfile)
}
ptm, ptsName, err := console.NewPty()
if err != nil {
return err
}
pts, err := os.OpenFile(ptsName, os.O_RDWR|syscall.O_NOCTTY, 0)
if err != nil {
ptm.Close()
return err
}
defer func() {
if process.Stdin != nil {
process.Stdin.Close()
}
pts.Close()
ptm.Close()
runcProcess.Shutdown()
err := eg.Wait()
if err != nil {
bklog.G(ctx).Warningf("error while shutting down tty io: %s", err)
}
}()
if process.Stdin != nil {
eg.Go(func() error {
_, err := io.Copy(ptm, process.Stdin)
// stdin might be a pipe, so this is like EOF
if errors.Is(err, io.ErrClosedPipe) {
return nil
}
return err
})
}
if process.Stdout != nil {
eg.Go(func() error {
_, err := io.Copy(process.Stdout, ptm)
// ignore `read /dev/ptmx: input/output error` when ptm is closed
var ptmClosedError *os.PathError
if errors.As(err, &ptmClosedError) {
if ptmClosedError.Op == "read" &&
ptmClosedError.Path == "/dev/ptmx" &&
ptmClosedError.Err == syscall.EIO {
return nil
}
}
return err
})
}
eg.Go(func() error {
err := runcProcess.WaitForReady(ctx)
if err != nil {
return err
}
for {
select {
case <-ctx.Done():
return nil
case resize := <-process.Resize:
err = ptm.Resize(console.WinSize{
Height: uint16(resize.Rows),
Width: uint16(resize.Cols),
})
if err != nil {
bklog.G(ctx).Errorf("failed to resize ptm: %s", err)
}
// SIGWINCH must be sent to the runc monitor process, as
// terminal resizing is done in runc.
err = runcProcess.monitorProcess.Signal(signal.SIGWINCH)
if err != nil {
bklog.G(ctx).Errorf("failed to send SIGWINCH to process: %s", err)
}
}
}
})
runcIO := &forwardIO{}
if process.Stdin != nil {
runcIO.stdin = pts
}
if process.Stdout != nil {
runcIO.stdout = pts
}
if process.Stderr != nil {
runcIO.stderr = pts
}
return call(ctx, startedCh, runcIO, killer.pidfile)
}
|
