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public.go
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public.go
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package files
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/aptly-dev/aptly/aptly"
"github.com/aptly-dev/aptly/utils"
)
// PublishedStorage abstract file system with public dirs (published repos)
type PublishedStorage struct {
rootPath string
linkMethod uint
verifyMethod uint
}
// Check interfaces
var (
_ aptly.PublishedStorage = (*PublishedStorage)(nil)
_ aptly.FileSystemPublishedStorage = (*PublishedStorage)(nil)
)
// Constants defining the type of creating links
const (
LinkMethodHardLink uint = iota
LinkMethodSymLink
LinkMethodCopy
)
// Constants defining the type of file verification for LinkMethodCopy
const (
VerificationMethodChecksum uint = iota
VerificationMethodFileSize
)
// NewPublishedStorage creates new instance of PublishedStorage which specified root
func NewPublishedStorage(root string, linkMethod string, verifyMethod string) *PublishedStorage {
// Ensure linkMethod is one of 'hardlink', 'symlink', 'copy'
var verifiedLinkMethod uint
if strings.EqualFold(linkMethod, "copy") {
verifiedLinkMethod = LinkMethodCopy
} else if strings.EqualFold(linkMethod, "symlink") {
verifiedLinkMethod = LinkMethodSymLink
} else {
verifiedLinkMethod = LinkMethodHardLink
}
var verifiedVerifyMethod uint
if strings.EqualFold(verifyMethod, "size") {
verifiedVerifyMethod = VerificationMethodFileSize
} else {
verifiedVerifyMethod = VerificationMethodChecksum
}
return &PublishedStorage{rootPath: root, linkMethod: verifiedLinkMethod,
verifyMethod: verifiedVerifyMethod}
}
// PublicPath returns root of public part
func (storage *PublishedStorage) PublicPath() string {
return storage.rootPath
}
// MkDir creates directory recursively under public path
func (storage *PublishedStorage) MkDir(path string) error {
return os.MkdirAll(filepath.Join(storage.rootPath, path), 0777)
}
// PutFile puts file into published storage at specified path
func (storage *PublishedStorage) PutFile(path string, sourceFilename string) error {
var (
source, f *os.File
err error
)
source, err = os.Open(sourceFilename)
if err != nil {
return err
}
defer source.Close()
f, err = os.Create(filepath.Join(storage.rootPath, path))
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(f, source)
return err
}
// Remove removes single file under public path
func (storage *PublishedStorage) Remove(path string) error {
if len(path) <= 0 {
panic("trying to remove empty path")
}
filepath := filepath.Join(storage.rootPath, path)
return os.Remove(filepath)
}
// RemoveDirs removes directory structure under public path
func (storage *PublishedStorage) RemoveDirs(path string, progress aptly.Progress) error {
if len(path) <= 0 {
panic("trying to remove the root directory")
}
filepath := filepath.Join(storage.rootPath, path)
if progress != nil {
progress.Printf("Removing %s...\n", filepath)
}
return os.RemoveAll(filepath)
}
// LinkFromPool links package file from pool to dist's pool location
//
// publishedDirectory is desired location in pool (like prefix/pool/component/liba/libav/)
// sourcePool is instance of aptly.PackagePool
// sourcePath is a relative path to package file in package pool
//
// LinkFromPool returns relative path for the published file to be included in package index
func (storage *PublishedStorage) LinkFromPool(publishedDirectory, baseName string, sourcePool aptly.PackagePool,
sourcePath string, sourceChecksums utils.ChecksumInfo, force bool) error {
poolPath := filepath.Join(storage.rootPath, publishedDirectory)
err := os.MkdirAll(poolPath, 0777)
if err != nil {
return err
}
var dstStat, srcStat os.FileInfo
dstStat, err = os.Stat(filepath.Join(poolPath, baseName))
if err == nil {
// already exists, check source file
srcStat, err = sourcePool.Stat(sourcePath)
if err != nil {
// source file doesn't exist? problem!
return err
}
if storage.linkMethod == LinkMethodCopy {
if storage.verifyMethod == VerificationMethodFileSize {
// if source and destination have the same size, no need to copy
if srcStat.Size() == dstStat.Size() {
return nil
}
} else {
// if source and destination have the same checksums, no need to copy
var dstMD5 string
dstMD5, err = utils.MD5ChecksumForFile(filepath.Join(poolPath, baseName))
if err != nil {
return err
}
if dstMD5 == sourceChecksums.MD5 {
return nil
}
}
} else {
srcSys := srcStat.Sys().(*syscall.Stat_t)
dstSys := dstStat.Sys().(*syscall.Stat_t)
// if source and destination inodes match, no need to link
// Symlink can point to different filesystem with identical inodes
// so we have to check the device as well.
if srcSys.Ino == dstSys.Ino && srcSys.Dev == dstSys.Dev {
return nil
}
}
// source and destination have different inodes, if !forced, this is fatal error
if !force {
return fmt.Errorf("error linking file to %s: file already exists and is different", filepath.Join(poolPath, baseName))
}
// forced, so remove destination
err = os.Remove(filepath.Join(poolPath, baseName))
if err != nil {
return err
}
}
// destination doesn't exist (or forced), create link or copy
if storage.linkMethod == LinkMethodCopy {
var r aptly.ReadSeekerCloser
r, err = sourcePool.Open(sourcePath)
if err != nil {
return err
}
var dst *os.File
dst, err = os.Create(filepath.Join(poolPath, baseName))
if err != nil {
r.Close()
return err
}
_, err = io.Copy(dst, r)
if err != nil {
r.Close()
dst.Close()
return err
}
err = r.Close()
if err != nil {
dst.Close()
return err
}
err = dst.Close()
} else if storage.linkMethod == LinkMethodSymLink {
err = sourcePool.(aptly.LocalPackagePool).Symlink(sourcePath, filepath.Join(poolPath, baseName))
} else {
err = sourcePool.(aptly.LocalPackagePool).Link(sourcePath, filepath.Join(poolPath, baseName))
}
return err
}
// Filelist returns list of files under prefix
func (storage *PublishedStorage) Filelist(prefix string) ([]string, error) {
root := filepath.Join(storage.rootPath, prefix)
result := []string{}
err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
result = append(result, path[len(root)+1:])
}
return nil
})
if err != nil && os.IsNotExist(err) {
// file path doesn't exist, consider it empty
return []string{}, nil
}
return result, err
}
// RenameFile renames (moves) file
func (storage *PublishedStorage) RenameFile(oldName, newName string) error {
return os.Rename(filepath.Join(storage.rootPath, oldName), filepath.Join(storage.rootPath, newName))
}
// SymLink creates a symbolic link, which can be read with ReadLink
func (storage *PublishedStorage) SymLink(src string, dst string) error {
return os.Symlink(filepath.Join(storage.rootPath, src), filepath.Join(storage.rootPath, dst))
}
// HardLink creates a hardlink of a file
func (storage *PublishedStorage) HardLink(src string, dst string) error {
return os.Link(filepath.Join(storage.rootPath, src), filepath.Join(storage.rootPath, dst))
}
// FileExists returns true if path exists
func (storage *PublishedStorage) FileExists(path string) (bool, error) {
if _, err := os.Lstat(filepath.Join(storage.rootPath, path)); os.IsNotExist(err) {
return false, nil
}
return true, nil
}
// ReadLink returns the symbolic link pointed to by path (relative to storage
// root)
func (storage *PublishedStorage) ReadLink(path string) (string, error) {
absPath, err := os.Readlink(filepath.Join(storage.rootPath, path))
if err != nil {
return absPath, err
}
return filepath.Rel(storage.rootPath, absPath)
}