forked from minio/mc
/
diff-main.go
154 lines (140 loc) · 4.32 KB
/
diff-main.go
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/*
* Minio Client (C) 2015 Minio, Inc.
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
package main
import (
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/iodine"
)
// Help message.
var diffCmd = cli.Command{
Name: "diff",
Usage: "Compute differences between two files or folders",
Description: "NOTE: This command *DOES NOT* check for content similarity, which means objects with same size, but different content will not be spotted",
Action: runDiffCmd,
CustomHelpTemplate: `NAME:
mc {{.Name}} - {{.Usage}}
USAGE:
mc {{.Name}} FIRST SECOND {{if .Description}}
DESCRIPTION:
{{.Description}}{{end}}{{if .Flags}}
FLAGS:
{{range .Flags}}{{.}}
{{end}}{{ end }}
EXAMPLES:
1. Compare foo.ogg on a local filesystem with bar.ogg on Amazon AWS cloud storage.
$ mc {{.Name}} foo.ogg https://s3.amazonaws.com/jukebox/bar.ogg
2. Compare two different folders on a local filesystem.
$ mc {{.Name}} ~/Photos /Media/Backup/Photos
`,
}
// runDiffCmd - is a handler for mc diff command
func runDiffCmd(ctx *cli.Context) {
if len(ctx.Args()) != 2 || ctx.Args().First() == "help" {
cli.ShowCommandHelpAndExit(ctx, "diff", 1) // last argument is exit code
}
config := mustGetMcConfig()
firstURL := ctx.Args().First()
secondURL := ctx.Args()[1]
var err error
firstURL, err = getExpandedURL(firstURL, config.Aliases)
if err != nil {
switch e := iodine.ToError(err).(type) {
case errUnsupportedScheme:
console.Fatalf("Unknown type of URL %s. %s\n", e.url, err)
default:
console.Fatalf("Unable to parse argument %s. %s\n", firstURL, err)
}
}
secondURL, err = getExpandedURL(secondURL, config.Aliases)
if err != nil {
switch e := iodine.ToError(err).(type) {
case errUnsupportedScheme:
console.Fatalf("Unknown type of URL %s. %s\n", e.url, err)
default:
console.Fatalf("Unable to parse argument %s. %s\n", secondURL, err)
}
}
if isURLRecursive(secondURL) {
console.Fatalf("Second URL cannot be recursive. %s\n", errInvalidArgument{})
}
newFirstURL := stripRecursiveURL(firstURL)
for diff := range doDiffCmd(newFirstURL, secondURL, isURLRecursive(firstURL)) {
if diff.err != nil {
console.Fatalln(diff.message)
}
console.Infoln(diff.message)
}
}
func doDiffInRoutine(firstURL, secondURL string, recursive bool, ch chan diff) {
defer close(ch)
_, firstContent, err := url2Stat(firstURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + firstURL + "’",
err: NewIodine(iodine.New(err, nil)),
}
return
}
_, secondContent, err := url2Stat(secondURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + secondURL + "’",
err: NewIodine(iodine.New(err, nil)),
}
return
}
if firstContent.Type.IsRegular() {
switch {
case secondContent.Type.IsDir():
newSecondURL, err := urlJoinPath(secondURL, firstURL)
if err != nil {
ch <- diff{
message: "Unable to construct new URL from ‘" + secondURL + "’ using ‘" + firstURL,
err: NewIodine(iodine.New(err, nil)),
}
return
}
doDiffObjects(firstURL, newSecondURL, ch)
case !secondContent.Type.IsRegular():
ch <- diff{
message: "‘" + firstURL + "’ and " + "‘" + secondURL + "’ differs in type.",
err: nil,
}
return
case secondContent.Type.IsRegular():
doDiffObjects(firstURL, secondURL, ch)
}
}
if firstContent.Type.IsDir() {
switch {
case !secondContent.Type.IsDir():
ch <- diff{
message: "‘" + firstURL + "’ and " + "‘" + secondURL + "’ differs in type.",
err: nil,
}
return
default:
doDiffDirs(firstURL, secondURL, recursive, ch)
}
}
}
// doDiffCmd - Execute the diff command
func doDiffCmd(firstURL, secondURL string, recursive bool) <-chan diff {
ch := make(chan diff)
go doDiffInRoutine(firstURL, secondURL, recursive, ch)
return ch
}