Introduce k0s airgap bundle-artifacts #5360
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2024 k0s authors | ||
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| 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 | ||
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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 | ||
| 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. | ||
| */ | ||
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| package airgap | ||
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| import ( | ||
| "bufio" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "iter" | ||
| "os" | ||
| "os/signal" | ||
| "slices" | ||
| "strconv" | ||
| "strings" | ||
| "syscall" | ||
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| "github.com/k0sproject/k0s/internal/pkg/file" | ||
| "github.com/k0sproject/k0s/pkg/airgap" | ||
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| "k8s.io/kubectl/pkg/util/term" | ||
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| "github.com/containerd/platforms" | ||
| "github.com/distribution/reference" | ||
| imagespecv1 "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/sirupsen/logrus" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
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| func newAirgapBundleArtifactsCmd(log logrus.FieldLogger, rewriteBundleRef airgap.RewriteRefFunc) *cobra.Command { | ||
| var ( | ||
| outPath string | ||
| platform = platforms.DefaultSpec() | ||
| bundler = airgap.OCIArtifactsBundler{ | ||
| Log: log, | ||
| RewriteTarget: rewriteBundleRef, | ||
| } | ||
| ) | ||
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| cmd := &cobra.Command{ | ||
| Use: "bundle-artifacts [flags] [names...]", | ||
| Short: "Bundles artifacts needed for airgapped installations into a tarball", | ||
| Long: `Bundles artifacts needed for airgapped installations into a tarball. Fetches the | ||
| artifacts from their OCI registries and bundles them into an OCI Image Layout | ||
| archive (written to standard output by default). Reads names from standard input | ||
| if no names are given on the command line.`, | ||
| RunE: func(cmd *cobra.Command, args []string) (err error) { | ||
| ctx := cmd.Context() | ||
| ctx, cancel := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGTERM) | ||
| defer cancel() | ||
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| cmd.SilenceUsage = true | ||
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| bundler.PlatformMatcher = platforms.Only(platform) | ||
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| var out io.Writer | ||
| if outPath == "" { | ||
| out = cmd.OutOrStdout() | ||
| if term.IsTerminal(out) { | ||
| return errors.New("cowardly refusing to write binary data to a terminal") | ||
| } | ||
| } else { | ||
| f, openErr := file.AtomicWithTarget(outPath).Open() | ||
| if openErr != nil { | ||
| return openErr | ||
| } | ||
| defer func() { | ||
| if err == nil { | ||
| err = f.Finish() | ||
| } else if closeErr := f.Close(); closeErr != nil { | ||
| err = errors.Join(err, closeErr) | ||
| } | ||
| }() | ||
| out = f | ||
| } | ||
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| var refs []reference.Named | ||
| if len(args) > 0 { | ||
| refs, err = parseArtifactRefsFromSeq(slices.Values(args)) | ||
| } else { | ||
| refs, err = parseArtifactRefsFromReader(cmd.InOrStdin()) | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| buffered := bufio.NewWriter(out) | ||
| if err := bundler.Run(ctx, refs, out); err != nil { | ||
| return err | ||
| } | ||
| return buffered.Flush() | ||
| }, | ||
| } | ||
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| cmd.Flags().StringVarP(&outPath, "output", "o", "", "output file path (writes to standard output if omitted)") | ||
| cmd.Flags().Var((*insecureRegistryFlag)(&bundler.InsecureRegistries), "insecure-registries", "one of "+strings.Join(insecureRegistryFlagValues[:], ", ")) | ||
| cmd.Flags().Var((*platformFlag)(&platform), "platform", "the platform to export") | ||
| cmd.Flags().StringArrayVar(&bundler.RegistriesConfigPaths, "registries-config", nil, "paths to the authentication files for OCI registries (uses the standard Docker config if omitted)") | ||
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| return cmd | ||
| } | ||
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| func parseArtifactRefsFromReader(in io.Reader) ([]reference.Named, error) { | ||
| words := bufio.NewScanner(in) | ||
| words.Split(bufio.ScanWords) | ||
| refs, err := parseArtifactRefsFromSeq(func(yield func(string) bool) { | ||
| for words.Scan() { | ||
| if !yield(words.Text()) { | ||
| return | ||
| } | ||
| } | ||
| }) | ||
| if err := errors.Join(err, words.Err()); err != nil { | ||
| return nil, err | ||
| } | ||
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| return refs, nil | ||
| } | ||
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| func parseArtifactRefsFromSeq(refs iter.Seq[string]) (collected []reference.Named, _ error) { | ||
|
There was a problem hiding this comment. The There was a problem hiding this comment. I'm not sure if I can follow. What would you suggest? |
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| for ref := range refs { | ||
| parsed, err := reference.ParseNormalizedNamed(ref) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("while parsing %s: %w", ref, err) | ||
| } | ||
| collected = append(collected, parsed) | ||
| } | ||
| return collected, nil | ||
| } | ||
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| type insecureRegistryFlag airgap.InsecureOCIRegistryKind | ||
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| var insecureRegistryFlagValues = [...]string{ | ||
| airgap.NoInsecureOCIRegistry: "no", | ||
| airgap.SkipTLSVerifyOCIRegistry: "skip-tls-verify", | ||
| airgap.PlainHTTPOCIRegistry: "plain-http", | ||
| } | ||
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| func (insecureRegistryFlag) Type() string { | ||
| return "string" | ||
| } | ||
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| func (i insecureRegistryFlag) String() string { | ||
| if i := int(i); i < len(insecureRegistryFlagValues) { | ||
| return insecureRegistryFlagValues[i] | ||
| } else { | ||
| return strconv.Itoa(i) | ||
| } | ||
| } | ||
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| func (i *insecureRegistryFlag) Set(value string) error { | ||
| idx := slices.Index(insecureRegistryFlagValues[:], value) | ||
| if idx >= 0 { | ||
| *(*airgap.InsecureOCIRegistryKind)(i) = airgap.InsecureOCIRegistryKind(idx) | ||
| return nil | ||
| } | ||
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| return errors.New("must be one of " + strings.Join(insecureRegistryFlagValues[:], ", ")) | ||
| } | ||
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| type platformFlag imagespecv1.Platform | ||
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| func (p *platformFlag) Type() string { | ||
| return "string" | ||
| } | ||
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| func (p *platformFlag) String() string { | ||
| return platforms.FormatAll(*(*imagespecv1.Platform)(p)) | ||
| } | ||
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| func (p *platformFlag) Set(value string) error { | ||
| platform, err := platforms.Parse(value) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| *(*imagespecv1.Platform)(p) = platform | ||
| return nil | ||
| } | ||
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Error not wrapped.
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I could change this to
return fmt.Errorf("failed to bundle artifacts: %w", err), but I'm not sure if that adds any additional insights 🤔