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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"context"
"os"
"github.com/google/subcommands"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/runsc/cmd/util"
"gvisor.dev/gvisor/runsc/config"
"gvisor.dev/gvisor/runsc/container"
"gvisor.dev/gvisor/runsc/flag"
"gvisor.dev/gvisor/runsc/specutils"
)
// Run implements subcommands.Command for the "run" command.
type Run struct {
// Run flags are a super-set of those for Create.
Create
// detach indicates that runsc has to start a process and exit without waiting it.
detach bool
// passFDs are user-supplied FDs from the host to be exposed to the
// sandboxed app.
passFDs fdMappings
// execFD is the host file descriptor used for program execution.
execFD int
}
// Name implements subcommands.Command.Name.
func (*Run) Name() string {
return "run"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Run) Synopsis() string {
return "create and run a secure container"
}
// Usage implements subcommands.Command.Usage.
func (*Run) Usage() string {
return `run [flags] <container id> - create and run a secure container.
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (r *Run) SetFlags(f *flag.FlagSet) {
f.BoolVar(&r.detach, "detach", false, "detach from the container's process")
f.Var(&r.passFDs, "pass-fd", "file descriptor passed to the container in M:N format, where M is the host and N is the guest descriptor (can be supplied multiple times)")
f.IntVar(&r.execFD, "exec-fd", -1, "host file descriptor used for program execution")
r.Create.SetFlags(f)
}
// Execute implements subcommands.Command.Execute.
func (r *Run) Execute(_ context.Context, f *flag.FlagSet, args ...any) subcommands.ExitStatus {
if f.NArg() != 1 {
f.Usage()
return subcommands.ExitUsageError
}
id := f.Arg(0)
conf := args[0].(*config.Config)
waitStatus := args[1].(*unix.WaitStatus)
if conf.Rootless {
if conf.Network == config.NetworkSandbox {
return util.Errorf("sandbox network isn't supported with --rootless, use --network=none or --network=host")
}
if err := specutils.MaybeRunAsRoot(); err != nil {
return util.Errorf("Error executing inside namespace: %v", err)
}
// Execution will continue here if no more capabilities are needed...
}
bundleDir := r.bundleDir
if bundleDir == "" {
bundleDir = getwdOrDie()
}
spec, err := specutils.ReadSpec(bundleDir, conf)
if err != nil {
return util.Errorf("reading spec: %v", err)
}
specutils.LogSpecDebug(spec, conf.OCISeccomp)
// Create files from file descriptors.
fdMap := make(map[int]*os.File)
for _, mapping := range r.passFDs {
file := os.NewFile(uintptr(mapping.Host), "")
if file == nil {
return util.Errorf("Failed to create file from file descriptor %d", mapping.Host)
}
fdMap[mapping.Guest] = file
}
var execFile *os.File
if r.execFD >= 0 {
execFile = os.NewFile(uintptr(r.execFD), "exec-fd")
}
// Close the underlying file descriptors after we have passed them.
defer func() {
for _, file := range fdMap {
fd := file.Fd()
if file.Close() != nil {
log.Debugf("Failed to close FD %d", fd)
}
}
if execFile != nil && execFile.Close() != nil {
log.Debugf("Failed to close exec FD")
}
}()
runArgs := container.Args{
ID: id,
Spec: spec,
BundleDir: bundleDir,
ConsoleSocket: r.consoleSocket,
PIDFile: r.pidFile,
UserLog: r.userLog,
Attached: !r.detach,
PassFiles: fdMap,
ExecFile: execFile,
}
ws, err := container.Run(conf, runArgs)
if err != nil {
return util.Errorf("running container: %v", err)
}
*waitStatus = ws
return subcommands.ExitSuccess
}
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