mirror of
https://github.com/minio/mc.git
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123 lines
3.4 KiB
Go
123 lines
3.4 KiB
Go
/*
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* MinIO Client, (C) 2015, 2016, 2017 MinIO, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 cmd
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import (
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"os"
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"syscall"
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"github.com/minio/cli"
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"github.com/minio/mc/pkg/probe"
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)
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var (
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pipeFlags = []cli.Flag{
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cli.StringFlag{
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Name: "encrypt",
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Usage: "encrypt objects (using server-side encryption with server managed keys)",
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},
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}
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)
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// Display contents of a file.
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var pipeCmd = cli.Command{
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Name: "pipe",
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Usage: "stream STDIN to an object",
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Action: mainPipe,
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Before: setGlobalsFromContext,
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Flags: append(append(pipeFlags, ioFlags...), globalFlags...),
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CustomHelpTemplate: `NAME:
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{{.HelpName}} - {{.Usage}}
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USAGE:
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{{.HelpName}} [FLAGS] [TARGET]
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{{if .VisibleFlags}}
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FLAGS:
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{{range .VisibleFlags}}{{.}}
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{{end}}{{end}}
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ENVIRONMENT VARIABLES:
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MC_ENCRYPT: list of comma delimited prefix values
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MC_ENCRYPT_KEY: list of comma delimited prefix=secret values
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EXAMPLES:
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1. Write contents of stdin to a file on local filesystem.
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$ {{.HelpName}} /tmp/hello-world.go
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2. Write contents of stdin to an object on Amazon S3 cloud storage.
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$ {{.HelpName}} s3/personalbuck/meeting-notes.txt
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3. Copy an ISO image to an object on Amazon S3 cloud storage.
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$ cat debian-8.2.iso | {{.HelpName}} s3/opensource-isos/gnuos.iso
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4. Stream MySQL database dump to Amazon S3 directly.
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$ mysqldump -u root -p ******* accountsdb | {{.HelpName}} s3/sql-backups/backups/accountsdb-oct-9-2015.sql
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`,
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}
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func pipe(targetURL string, encKeyDB map[string][]prefixSSEPair) *probe.Error {
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if targetURL == "" {
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// When no target is specified, pipe cat's stdin to stdout.
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return catOut(os.Stdin, -1).Trace()
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}
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alias, _ := url2Alias(targetURL)
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sseKey := getSSE(targetURL, encKeyDB[alias])
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// Stream from stdin to multiple objects until EOF.
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// Ignore size, since os.Stat() would not return proper size all the time
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// for local filesystem for example /proc files.
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_, err := putTargetStreamWithURL(targetURL, os.Stdin, -1, sseKey)
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// TODO: See if this check is necessary.
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switch e := err.ToGoError().(type) {
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case *os.PathError:
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if e.Err == syscall.EPIPE {
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// stdin closed by the user. Gracefully exit.
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return nil
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}
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}
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return err.Trace(targetURL)
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}
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// check pipe input arguments.
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func checkPipeSyntax(ctx *cli.Context) {
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if len(ctx.Args()) > 1 {
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cli.ShowCommandHelpAndExit(ctx, "pipe", 1) // last argument is exit code.
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}
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}
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// mainPipe is the main entry point for pipe command.
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func mainPipe(ctx *cli.Context) error {
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// Parse encryption keys per command.
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encKeyDB, err := getEncKeys(ctx)
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fatalIf(err, "Unable to parse encryption keys.")
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// validate pipe input arguments.
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checkPipeSyntax(ctx)
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if len(ctx.Args()) == 0 {
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err = pipe("", nil)
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fatalIf(err.Trace("stdout"), "Unable to write to one or more targets.")
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} else {
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// extract URLs.
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URLs := ctx.Args()
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err = pipe(URLs[0], encKeyDB)
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fatalIf(err.Trace(URLs[0]), "Unable to write to one or more targets.")
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}
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// Done.
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return nil
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}
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