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dump.go
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dump.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 fsutil
import (
"errors"
"fmt"
"io"
"io/fs"
"os"
"path/filepath"
"go.uber.org/zap"
"github.com/elastic/harp/pkg/sdk/log"
)
// Dump the given vfs to the outputpath
func Dump(srcFs fs.FS, outPath string) error {
return fs.WalkDir(srcFs, ".", func(path string, d fs.DirEntry, errWalk error) error {
// Raise immediately the error if any.
if errWalk != nil {
return fmt.Errorf("%s: %w", path, errWalk)
}
// Ignore directory
if d.IsDir() {
return nil
}
// Compute the target path
targetPath := filepath.Join(outPath, path)
// Extract relative directory
relativeDir := filepath.Dir(targetPath)
// Check folder hierarchy existence.
if _, err := os.Stat(relativeDir); os.IsNotExist(err) {
if err := os.MkdirAll(relativeDir, 0o755); err != nil {
return fmt.Errorf("unable to create intermediate directories for path '%s': %w", relativeDir, err)
}
}
// Create file
targetFile, err := os.Create(targetPath)
if err != nil {
return fmt.Errorf("unable to create the output file: %w", err)
}
// Open input file
srcFile, err := srcFs.Open(path)
if err != nil {
return fmt.Errorf("unable to open source file: %w", err)
}
log.Bg().Debug("Copy file ...", zap.String("file", path))
// Open the target file
if _, err := io.Copy(targetFile, srcFile); err != nil {
if !errors.Is(err, io.EOF) {
return fmt.Errorf("unable to copy content from '%s' to '%s': %w", path, targetPath, err)
}
}
// Close the file
return srcFile.Close()
})
}