github.com/zntrio/harp/v2@v2.0.9/pkg/sdk/fsutil/builder.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package fsutil
    19  
    20  import (
    21  	"errors"
    22  	"fmt"
    23  	"io/fs"
    24  	"os"
    25  	"path/filepath"
    26  	"strings"
    27  
    28  	"github.com/zntrio/harp/v2/pkg/sdk/fsutil/targzfs"
    29  )
    30  
    31  var ErrNotSupported = errors.New("not supported filesystem path")
    32  
    33  func From(rootPath string) (fs.FS, error) {
    34  	// Get absolute path
    35  	absPath, errPath := filepath.Abs(filepath.Clean(rootPath))
    36  	if errPath != nil {
    37  		return nil, fmt.Errorf("unable to get absolute path: %w", errPath)
    38  	}
    39  
    40  	// Check existence
    41  	fi, errFileInfo := os.Stat(absPath)
    42  	if errFileInfo != nil {
    43  		return nil, fmt.Errorf("unabe to retrieve file information: %w", errFileInfo)
    44  	}
    45  
    46  	var (
    47  		errRootFS  error
    48  		fileRootFS fs.FS
    49  	)
    50  	switch {
    51  	case !fi.IsDir() && strings.HasSuffix(absPath, ".tar.gz"):
    52  		// Create in-memory filesystem.
    53  		fileRootFS, errRootFS = targzfs.FromFile(os.DirFS(filepath.Dir(absPath)), filepath.Base(absPath))
    54  	case fi.IsDir():
    55  		fileRootFS = os.DirFS(absPath)
    56  	default:
    57  		errRootFS = ErrNotSupported
    58  	}
    59  	if errRootFS != nil {
    60  		return nil, fmt.Errorf("unable to prepare filesystem: %w", errRootFS)
    61  	}
    62  
    63  	// No error
    64  	return fileRootFS, nil
    65  }