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// Package cacheitem is an abstraction over the creation and restoration of a cache
package cacheitem
import (
"archive/tar"
"bufio"
"crypto/sha512"
"errors"
"io"
"os"
"github.com/vercel/turbo/cli/internal/turbopath"
)
var (
errMissingSymlinkTarget = errors.New("symlink restoration is delayed")
errCycleDetected = errors.New("links in the cache are cyclic")
errTraversal = errors.New("tar attempts to write outside of directory")
errNameMalformed = errors.New("file name is malformed")
errNameWindowsUnsafe = errors.New("file name is not Windows-safe")
errUnsupportedFileType = errors.New("attempted to restore unsupported file type")
)
// CacheItem is a `tar` utility with a little bit extra.
type CacheItem struct {
// Path is the location on disk for the CacheItem.
Path turbopath.AbsoluteSystemPath
// Anchor is the position on disk at which the CacheItem will be restored.
Anchor turbopath.AbsoluteSystemPath
// For creation.
tw *tar.Writer
zw io.WriteCloser
fileBuffer *bufio.Writer
handle *os.File
compressed bool
}
// Close any open pipes
func (ci *CacheItem) Close() error {
if ci.tw != nil {
if err := ci.tw.Close(); err != nil {
return err
}
}
if ci.zw != nil {
if err := ci.zw.Close(); err != nil {
return err
}
}
if ci.fileBuffer != nil {
if err := ci.fileBuffer.Flush(); err != nil {
return err
}
}
if ci.handle != nil {
if err := ci.handle.Close(); err != nil {
return err
}
}
return nil
}
// GetSha returns the SHA-512 hash for the CacheItem.
func (ci *CacheItem) GetSha() ([]byte, error) {
sha := sha512.New()
if _, err := io.Copy(sha, ci.handle); err != nil {
return nil, err
}
return sha.Sum(nil), nil
}
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