mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 03:35:06 +00:00
110 lines
3.3 KiB
Go
110 lines
3.3 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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"github.com/kubernetes-sigs/kustomize/pkg/fs"
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)
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const currentDir = "."
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// fileLoader loads files from a file system.
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type fileLoader struct {
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root string
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fSys fs.FileSystem
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}
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// NewFileLoader returns a new fileLoader.
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func NewFileLoader(fSys fs.FileSystem) *fileLoader {
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return newFileLoaderAtRoot("", fSys)
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}
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// newFileLoaderAtRoot returns a new fileLoader with given root.
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func newFileLoaderAtRoot(root string, fs fs.FileSystem) *fileLoader {
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return &fileLoader{root: root, fSys: fs}
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}
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// Root returns the root location for this Loader.
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func (l *fileLoader) Root() string {
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return l.root
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}
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// Returns a new Loader rooted at newRoot. "newRoot" MUST be
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// a directory (not a file). The directory can have a trailing
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// slash or not.
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// Example: "/home/seans/project" or "/home/seans/project/"
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// NOT "/home/seans/project/file.yaml".
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func (l *fileLoader) New(newRoot string) (Loader, error) {
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return NewLoader(newRoot, l.root, l.fSys)
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}
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// IsAbsPath return true if the location calculated with the root
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// and location params a full file path.
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func (l *fileLoader) IsAbsPath(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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// fullLocation returns some notion of a full path.
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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(location string) ([]byte, error) {
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fullLocation, err := l.fullLocation(l.root, location)
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if err != nil {
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fmt.Printf("Trouble in fulllocation: %v\n", err)
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return nil, err
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}
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return l.fSys.ReadFile(fullLocation)
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}
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// Cleanup does nothing
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func (l *fileLoader) Cleanup() error {
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return nil
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}
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