package main import ( contextpkg "context" "io" "os" "github.com/docker/containerd/log" "github.com/urfave/cli" ) // TODO(stevvooe): Create "multi-fetch" mode that just takes a remote // then receives object/hint lines on stdin, returning content as // needed. var fetchObjectCommand = cli.Command{ Name: "fetch-object", Usage: "retrieve objects from a remote", ArgsUsage: "[flags] [, ...]", Description: `Fetch objects by identifier from a remote.`, Flags: []cli.Flag{ cli.DurationFlag{ Name: "timeout", Usage: "total timeout for fetch", EnvVar: "CONTAINERD_FETCH_TIMEOUT", }, }, Action: func(context *cli.Context) error { var ( ctx = background timeout = context.Duration("timeout") ref = context.Args().First() ) if timeout > 0 { var cancel func() ctx, cancel = contextpkg.WithTimeout(ctx, timeout) defer cancel() } resolver, err := getResolver(ctx) if err != nil { return err } ctx = log.WithLogger(ctx, log.G(ctx).WithField("ref", ref)) log.G(ctx).Infof("resolving") _, desc, fetcher, err := resolver.Resolve(ctx, ref) if err != nil { return err } log.G(ctx).Infof("fetching") rc, err := fetcher.Fetch(ctx, desc) if err != nil { return err } defer rc.Close() _, err = io.Copy(os.Stdout, rc) return err }, }