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// Copyright (c) Contributors to the Apptainer project, established as
// Apptainer a Series of LF Projects LLC.
// For website terms of use, trademark policy, privacy policy and other
// project policies see https://lfprojects.org/policies
// Copyright (c) 2018-2020, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
// Package cache provides support for caching SIF, OCI, SHUB images and any OCI layers used to build them
package cache
import (
"fmt"
"os"
"github.com/apptainer/apptainer/internal/pkg/util/fs"
"github.com/apptainer/apptainer/pkg/sylog"
)
// Entry is a structure representing an entry in the cache. An entry is a file under the
// CacheType subdir within the Cache rootDir
type Entry struct {
// cacheType indicates which subcache / subdir the entry belongs to, e.g. 'library'
CacheType string
// exists is true if the entry exists in the cache at path
Exists bool
// path is the location of the entry if exists is true, or the location that a new entry
// will take when it is finalized
Path string
// tmpPath is the temporary location that should be used for a new cache entry as it
// is created
TmpPath string
}
// Finalize an entry by renaming it to its permanent path atomically
func (e *Entry) Finalize() error {
// Try to rename the temporary file to its permanent path
// This is a file, so we won't have an IsExist error since...
// If newpath already exists and is not a directory, Rename replaces it.
// https://golang.org/pkg/os/#Rename
err := os.Rename(e.TmpPath, e.Path)
if err != nil {
return fmt.Errorf("could not finalize cached file: %v", err)
}
return nil
}
// CleanTmp should be defer'd when an Entry is created and will remove any temporary file
func (e *Entry) CleanTmp() {
// If there is no TmpPath / file there then there is nothing to clean up
if e.TmpPath == "" || !fs.IsFile(e.TmpPath) {
return
}
err := os.Remove(e.TmpPath)
if err != nil {
sylog.Errorf("Could not remove cache temporary file '%s': %v", e.TmpPath, err)
}
}
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