frostfs-s3-gw/cmd/os-readdir_other.go

127 lines
3 KiB
Go

// +build plan9 solaris
/*
* MinIO Cloud Storage, (C) 2016-2020 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 cmd
import (
"io"
"os"
"strings"
)
// Return all the entries at the directory dirPath.
func readDir(dirPath string) (entries []string, err error) {
return readDirN(dirPath, -1)
}
// readDir applies the filter function on each entries at dirPath, doesn't recurse into
// the directory itself.
func readDirFilterFn(dirPath string, filter func(name string, typ os.FileMode) error) error {
d, err := os.Open(dirPath)
if err != nil {
// File is really not found.
if os.IsNotExist(err) {
return errFileNotFound
}
// File path cannot be verified since one of the parents is a file.
if strings.Contains(err.Error(), "not a directory") {
return errFileNotFound
}
return err
}
defer d.Close()
maxEntries := 1000
for {
// Read up to max number of entries.
fis, err := d.Readdir(maxEntries)
if err != nil {
if err == io.EOF {
break
}
return err
}
for _, fi := range fis {
if err = filter(fi.Name(), fi.Mode()); err == errDoneForNow {
// filtering requested to return by caller.
return nil
}
}
}
return nil
}
// Return N entries at the directory dirPath. If count is -1, return all entries
func readDirN(dirPath string, count int) (entries []string, err error) {
d, err := os.Open(dirPath)
if err != nil {
// File is really not found.
if os.IsNotExist(err) {
return nil, errFileNotFound
}
// File path cannot be verified since one of the parents is a file.
if strings.Contains(err.Error(), "not a directory") {
return nil, errFileNotFound
}
return nil, err
}
defer d.Close()
maxEntries := 1000
if count > 0 && count < maxEntries {
maxEntries = count
}
done := false
remaining := count
for !done {
// Read up to max number of entries.
fis, err := d.Readdir(maxEntries)
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
if count > 0 {
if remaining <= len(fis) {
fis = fis[:remaining]
done = true
}
}
for _, fi := range fis {
// Not need to follow symlink.
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
continue
}
if fi.Mode().IsDir() {
// Append SlashSeparator instead of "\" so that sorting is achieved as expected.
entries = append(entries, fi.Name()+SlashSeparator)
} else if fi.Mode().IsRegular() {
entries = append(entries, fi.Name())
}
if count > 0 {
remaining--
}
}
}
return entries, nil
}