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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 dockerutil is a collection of utility functions.
package dockerutil
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os/exec"
"regexp"
"strconv"
"gvisor.dev/gvisor/pkg/test/testutil"
)
var (
// runtime is the runtime to use for tests. This will be applied to all
// containers. Note that the default here ("runsc") corresponds to the
// default used by the installations. This is important, because the
// default installer for vm_tests (in tools/installers:head, invoked
// via tools/vm:defs.bzl) will install with this name. So without
// changing anything, tests should have a runsc runtime available to
// them. Otherwise installers should update the existing runtime
// instead of installing a new one.
runtime = flag.String("runtime", "runsc", "specify which runtime to use")
// config is the default Docker daemon configuration path.
config = flag.String("config_path", "/etc/docker/daemon.json", "configuration file for reading paths")
)
// EnsureSupportedDockerVersion checks if correct docker is installed.
//
// This logs directly to stderr, as it is typically called from a Main wrapper.
func EnsureSupportedDockerVersion() {
cmd := exec.Command("docker", "version")
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("error running %q: %v", "docker version", err)
}
re := regexp.MustCompile(`Version:\s+(\d+)\.(\d+)\.\d.*`)
matches := re.FindStringSubmatch(string(out))
if len(matches) != 3 {
log.Fatalf("Invalid docker output: %s", out)
}
major, _ := strconv.Atoi(matches[1])
minor, _ := strconv.Atoi(matches[2])
if major < 17 || (major == 17 && minor < 9) {
log.Fatalf("Docker version 17.09.0 or greater is required, found: %02d.%02d", major, minor)
}
}
// RuntimePath returns the binary path for the current runtime.
func RuntimePath() (string, error) {
// Read the configuration data; the file must exist.
configBytes, err := ioutil.ReadFile(*config)
if err != nil {
return "", err
}
// Unmarshal the configuration.
c := make(map[string]interface{})
if err := json.Unmarshal(configBytes, &c); err != nil {
return "", err
}
// Decode the expected configuration.
r, ok := c["runtimes"]
if !ok {
return "", fmt.Errorf("no runtimes declared: %v", c)
}
rs, ok := r.(map[string]interface{})
if !ok {
// The runtimes are not a map.
return "", fmt.Errorf("unexpected format: %v", c)
}
r, ok = rs[*runtime]
if !ok {
// The expected runtime is not declared.
return "", fmt.Errorf("runtime %q not found: %v", *runtime, c)
}
rs, ok = r.(map[string]interface{})
if !ok {
// The runtime is not a map.
return "", fmt.Errorf("unexpected format: %v", c)
}
p, ok := rs["path"].(string)
if !ok {
// The runtime does not declare a path.
return "", fmt.Errorf("unexpected format: %v", c)
}
return p, nil
}
// Save exports a container image to the given Writer.
//
// Note that the writer should be actively consuming the output, otherwise it
// is not guaranteed that the Save will make any progress and the call may
// stall indefinitely.
//
// This is called by criutil in order to import imports.
func Save(logger testutil.Logger, image string, w io.Writer) error {
cmd := testutil.Command(logger, "docker", "save", testutil.ImageByName(image))
cmd.Stdout = w // Send directly to the writer.
return cmd.Run()
}
// Runtime returns the value of the flag runtime.
func Runtime() string {
return *runtime
}
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