122 lines
4.8 KiB
Go
122 lines
4.8 KiB
Go
//go:build windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package opts
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import (
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"context"
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"errors"
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"strings"
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"github.com/containerd/containerd/v2/core/containers"
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"github.com/containerd/containerd/v2/pkg/oci"
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imagespec "github.com/opencontainers/image-spec/specs-go/v1"
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runtimespec "github.com/opencontainers/runtime-spec/specs-go"
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"golang.org/x/sys/windows"
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runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
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)
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func escapeAndCombineArgsWindows(args []string) string {
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escaped := make([]string, len(args))
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for i, a := range args {
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escaped[i] = windows.EscapeArg(a)
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}
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return strings.Join(escaped, " ")
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}
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// WithProcessCommandLineOrArgsForWindows sets the process command line or process args on the spec based on the image
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// and runtime config
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// If image.ArgsEscaped field is set, this function sets the process command line and if not, it sets the
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// process args field
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func WithProcessCommandLineOrArgsForWindows(config *runtime.ContainerConfig, image *imagespec.ImageConfig) oci.SpecOpts {
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if image.ArgsEscaped { //nolint:staticcheck // ArgsEscaped is deprecated
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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// firstArgFromImg is a flag that is returned to indicate that the first arg in the slice comes from either the
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// image Entrypoint or Cmd. If the first arg instead comes from the container config (e.g. overriding the image values),
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// it should be false. This is done to support the non-OCI ArgsEscaped field that Docker used to determine how the image
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// entrypoint and cmd should be interpreted.
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//
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args, firstArgFromImg, err := getArgs(image.Entrypoint, image.Cmd, config.GetCommand(), config.GetArgs())
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if err != nil {
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return err
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}
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var cmdLine string
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if image.ArgsEscaped && firstArgFromImg { //nolint:staticcheck // ArgsEscaped is deprecated
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cmdLine = args[0]
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if len(args) > 1 {
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cmdLine += " " + escapeAndCombineArgsWindows(args[1:])
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}
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} else {
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cmdLine = escapeAndCombineArgsWindows(args)
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}
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return oci.WithProcessCommandLine(cmdLine)(ctx, client, c, s)
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}
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}
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// if ArgsEscaped is not set
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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args, _, err := getArgs(image.Entrypoint, image.Cmd, config.GetCommand(), config.GetArgs())
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if err != nil {
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return err
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}
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return oci.WithProcessArgs(args...)(ctx, client, c, s)
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}
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}
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// getArgs is used to evaluate the overall args for the container by taking into account the image command and entrypoints
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// along with the container command and entrypoints specified through the podspec if any
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func getArgs(imgEntrypoint []string, imgCmd []string, ctrEntrypoint []string, ctrCmd []string) ([]string, bool, error) {
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//nolint:dupword
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// firstArgFromImg is a flag that is returned to indicate that the first arg in the slice comes from either the image
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// Entrypoint or Cmd. If the first arg instead comes from the container config (e.g. overriding the image values),
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// it should be false.
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// Essentially this means firstArgFromImg should be true iff:
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// Ctr entrypoint ctr cmd image entrypoint image cmd firstArgFromImg
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// --------------------------------------------------------------------------------
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// nil nil exists nil true
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// nil nil nil exists true
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// This is needed to support the non-OCI ArgsEscaped field used by Docker. ArgsEscaped is used for
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// Windows images to indicate that the command has already been escaped and should be
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// used directly as the command line.
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var firstArgFromImg bool
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entrypoint, cmd := ctrEntrypoint, ctrCmd
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// The following logic is migrated from https://github.com/moby/moby/blob/master/daemon/commit.go
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// TODO(random-liu): Clearly define the commands overwrite behavior.
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if len(entrypoint) == 0 {
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// Copy array to avoid data race.
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if len(cmd) == 0 {
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cmd = append([]string{}, imgCmd...)
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if len(imgCmd) > 0 {
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firstArgFromImg = true
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}
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}
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if entrypoint == nil {
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entrypoint = append([]string{}, imgEntrypoint...)
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if len(imgEntrypoint) > 0 || len(ctrCmd) == 0 {
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firstArgFromImg = true
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}
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}
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}
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if len(entrypoint) == 0 && len(cmd) == 0 {
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return nil, false, errors.New("no command specified")
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}
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return append(entrypoint, cmd...), firstArgFromImg, nil
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}
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