82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 loader
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import (
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"fmt"
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"os"
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"path/filepath"
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"k8s.io/kubectl/pkg/kinflate/util/fs"
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)
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const currentDir = "."
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// Internal implementation of SchemeLoader interface.
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type fileLoader struct {
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fs fs.FileSystem
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}
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// NewFileLoader returns a SchemeLoader to handle a file system.
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func NewFileLoader(fs fs.FileSystem) SchemeLoader {
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return &fileLoader{fs: fs}
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}
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// Is the location calculated with the root and location params a full file path.
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func (l *fileLoader) IsScheme(root string, location string) bool {
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fullFilePath, err := l.FullLocation(root, location)
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if err != nil {
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return false
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}
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return filepath.IsAbs(fullFilePath)
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}
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// If location is a full file path, then ignore root. If location is relative, then
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// join the root path with the location path. Either root or location can be empty,
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// but not both. Special case for ".": Expands to current working directory.
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// Example: "/home/seans/project", "subdir/bar" -> "/home/seans/project/subdir/bar".
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func (l *fileLoader) FullLocation(root string, location string) (string, error) {
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// First, validate the parameters
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if len(root) == 0 && len(location) == 0 {
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return "", fmt.Errorf("Unable to calculate full location: root and location empty")
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}
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// Special case current directory, expanding to full file path.
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if location == currentDir {
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currentDir, err := os.Getwd()
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if err != nil {
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return "", err
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}
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location = currentDir
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}
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// Assume the location is a full file path. If not, then join root with location.
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fullLocation := location
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if !filepath.IsAbs(location) {
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fullLocation = filepath.Join(root, location)
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}
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return fullLocation, nil
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}
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// Load returns the bytes from reading a file at fullFilePath.
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// Implements the Loader interface.
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func (l *fileLoader) Load(fullFilePath string) ([]byte, error) {
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// Validate path to load from is a full file path.
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if !filepath.IsAbs(fullFilePath) {
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return nil, fmt.Errorf("Attempting to load file without full file path: %s\n", fullFilePath)
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}
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return l.fs.ReadFile(fullFilePath)
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}
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