107 lines
3.1 KiB
Go
107 lines
3.1 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cmd
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import (
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"context"
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"fmt"
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"math/rand"
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"os"
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"github.com/google/subcommands"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/runsc/config"
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"gvisor.dev/gvisor/runsc/flag"
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"gvisor.dev/gvisor/runsc/specutils"
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)
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// VerityPrepare implements subcommands.Commands for the "verity-prepare"
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// command. It sets up a sandbox with a writable verity mount mapped to "--dir",
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// and executes the verity measure tool specified by "--tool" in the sandbox. It
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// is intended to prepare --dir to be mounted as a verity filesystem.
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type VerityPrepare struct {
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root string
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tool string
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dir string
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}
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// Name implements subcommands.Command.Name.
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func (*VerityPrepare) Name() string {
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return "verity-prepare"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*VerityPrepare) Synopsis() string {
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return "Generates the data structures necessary to enable verityfs on a filesystem."
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}
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// Usage implements subcommands.Command.Usage.
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func (*VerityPrepare) Usage() string {
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return "verity-prepare --tool=<measure_tool> --dir=<path>"
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (c *VerityPrepare) SetFlags(f *flag.FlagSet) {
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f.StringVar(&c.root, "root", "/", `path to the root directory, defaults to "/"`)
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f.StringVar(&c.tool, "tool", "", "path to the verity measure_tool")
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f.StringVar(&c.dir, "dir", "", "path to the directory to be hashed")
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}
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// Execute implements subcommands.Command.Execute.
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func (c *VerityPrepare) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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conf := args[0].(*config.Config)
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waitStatus := args[1].(*unix.WaitStatus)
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hostname, err := os.Hostname()
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if err != nil {
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return Errorf("Error to retrieve hostname: %v", err)
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}
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// Map the entire host file system.
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absRoot, err := resolvePath(c.root)
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if err != nil {
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return Errorf("Error resolving root: %v", err)
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}
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spec := &specs.Spec{
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Root: &specs.Root{
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Path: absRoot,
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},
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Process: &specs.Process{
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Cwd: absRoot,
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Args: []string{c.tool, "--path", "/verityroot"},
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Env: os.Environ(),
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Capabilities: specutils.AllCapabilities(),
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},
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Hostname: hostname,
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Mounts: []specs.Mount{
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specs.Mount{
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Source: c.dir,
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Destination: "/verityroot",
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Type: "bind",
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Options: []string{"verity.roothash="},
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},
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},
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}
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cid := fmt.Sprintf("runsc-%06d", rand.Int31n(1000000))
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// Force no networking, it is not necessary to run the verity measure tool.
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conf.Network = config.NetworkNone
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return startContainerAndWait(spec, conf, cid, waitStatus)
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}
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