mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-29 01:16:12 -05:00
116 lines
2.7 KiB
Go
116 lines
2.7 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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// oci-pin generates Go code and shasum files for OCI images.
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package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"strings"
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"github.com/spf13/cobra"
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)
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func main() {
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if err := execute(); err != nil {
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os.Exit(1)
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}
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}
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func execute() error {
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rootCmd := newRootCmd()
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ctx, cancel := signalContext(context.Background(), os.Interrupt)
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defer cancel()
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return rootCmd.ExecuteContext(ctx)
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}
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func newRootCmd() *cobra.Command {
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rootCmd := &cobra.Command{
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Use: "oci-pin",
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Short: "Generate pinning artifacts for OCI images.",
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Long: "Generate pinning artifacts (Go code, shasum files) for OCI images.",
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PersistentPreRun: preRunRoot,
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}
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rootCmd.SetOut(os.Stdout)
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rootCmd.PersistentFlags().Bool("verbose", false, "Enable verbose output.")
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rootCmd.AddCommand(newCodegenCmd())
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rootCmd.AddCommand(newSumCmd())
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rootCmd.AddCommand(newMergeCmd())
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return rootCmd
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}
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// signalContext returns a context that is canceled on the handed signal.
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// The signal isn't watched after its first occurrence. Call the cancel
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// function to ensure the internal goroutine is stopped and the signal isn't
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// watched any longer.
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func signalContext(ctx context.Context, sig os.Signal) (context.Context, context.CancelFunc) {
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sigCtx, stop := signal.NotifyContext(ctx, sig)
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done := make(chan struct{}, 1)
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stopDone := make(chan struct{}, 1)
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go func() {
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defer func() { stopDone <- struct{}{} }()
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defer stop()
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select {
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case <-sigCtx.Done():
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fmt.Println(" Signal caught. Press ctrl+c again to terminate the program immediately.")
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case <-done:
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}
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}()
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cancelFunc := func() {
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done <- struct{}{}
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<-stopDone
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}
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return sigCtx, cancelFunc
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}
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func preRunRoot(cmd *cobra.Command, _ []string) {
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cmd.SilenceUsage = true
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}
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func must(err error) {
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if err != nil {
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panic(err)
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}
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}
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func splitRepoTag(ref string) (registry, prefix, name, tag string, err error) {
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// last colon is separator between name and tag
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tagSep := strings.LastIndexByte(ref, ':')
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if tagSep == -1 {
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return "", "", "", "", fmt.Errorf("invalid OCI image reference %q: missing tag", ref)
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}
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tag = ref[tagSep+1:]
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base := ref[:tagSep]
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// first slash is separator between registry and full name
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registrySep := strings.IndexByte(base, '/')
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if registrySep == -1 {
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return "", "", "", "", fmt.Errorf("invalid OCI image reference %q: missing registry", ref)
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}
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registry = base[:registrySep]
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fullName := base[registrySep+1:]
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// last slash is separator between prefix and short name
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nameSep := strings.LastIndexByte(fullName, '/')
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if nameSep == -1 {
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name = fullName
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} else {
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prefix = fullName[:nameSep]
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name = fullName[nameSep+1:]
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}
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return
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}
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