mirror of
https://github.com/minio/mc.git
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122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
/*
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* Minio Client, (C) 2015 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 main
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import (
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"io"
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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/minio/pkg/probe"
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)
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// Help message.
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var catCmd = cli.Command{
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Name: "cat",
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Usage: "Display contents of a file",
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Action: mainCat,
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CustomHelpTemplate: `NAME:
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mc {{.Name}} - {{.Usage}}
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USAGE:
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mc {{.Name}}{{if .Flags}} [ARGS...]{{end}} SOURCE [SOURCE...] {{if .Description}}
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DESCRIPTION:
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{{.Description}}{{end}}{{if .Flags}}
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FLAGS:
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{{range .Flags}}{{.}}
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{{end}}{{ end }}
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EXAMPLES:
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1. Concantenate an object from Amazon S3 cloud storage to mplayer standard input.
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$ mc {{.Name}} https://s3.amazonaws.com/ferenginar/klingon_opera_aktuh_maylotah.ogg | mplayer -
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2. Concantenate a file from local filesystem to standard output.
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$ mc {{.Name}} khitomer-accords.txt
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3. Concantenate multiple files from local filesystem to standard output.
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$ mc {{.Name}} *.txt > newfile.txt
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4. Concatenate a non english file name from Amazon S3 cloud storage.
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$ mc {{.Name}} s3:andoria/本語 > /tmp/本語
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`,
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}
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func mainCat(ctx *cli.Context) {
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stdinMode := false
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if globalMimicFlag {
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if !ctx.Args().Present() {
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stdinMode = true
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}
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} else if !ctx.Args().Present() || ctx.Args().First() == "help" {
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cli.ShowCommandHelpAndExit(ctx, "cat", 1) // last argument is exit code
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}
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if stdinMode {
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fatalIf(catOut(os.Stdin).Trace(), "Unable to read from stdin.")
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} else {
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// Convert arguments to URLs: expand alias, fix format...
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for _, arg := range ctx.Args() {
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fatalIf(catURL(arg).Trace(arg), "Unable to read from ‘"+arg+"’.")
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}
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}
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}
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func catURL(sourceURL string) *probe.Error {
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config := mustGetMcConfig()
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URL, err := getCanonicalizedURL(sourceURL, config.Aliases)
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if err != nil {
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return err.Trace(sourceURL)
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}
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sourceClnt, err := source2Client(URL)
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if err != nil {
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return err.Trace(URL)
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}
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// Ignore size, since os.Stat() would not return proper size all the time for local filesystem for example /proc files.
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reader, _, err := sourceClnt.GetObject(0, 0)
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if err != nil {
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return err.Trace(URL)
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}
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defer reader.Close()
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return catOut(reader).Trace(URL)
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}
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func catOut(r io.Reader) *probe.Error {
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// read till EOF
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if _, err := io.Copy(os.Stdout, r); err != nil {
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switch e := err.(type) {
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case *os.PathError:
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if e.Err == syscall.EPIPE {
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// stdout closed by the user. Gracefully exit.
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return nil
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}
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return probe.NewError(err)
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default:
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return probe.NewError(err)
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}
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}
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return nil
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}
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