func (sub *Sub) compareEntries(request *subproto.UpdateRequest,
subEntry, requiredEntry *filesystem.DirectoryEntry, myPathName string) {
subInode := subEntry.Inode()
requiredInode := requiredEntry.Inode()
sameType, sameMetadata, sameData := filesystem.CompareInodes(
subInode, requiredInode, nil)
if requiredInode, ok := requiredInode.(*filesystem.DirectoryInode); ok {
if sameMetadata {
return
}
if sameType {
makeDirectory(request, requiredInode, myPathName, false)
} else {
makeDirectory(request, requiredInode, myPathName, true)
}
return
}
if sameType && sameData && sameMetadata {
sub.relink(request, subEntry, requiredEntry, myPathName)
return
}
if sameType && sameData {
sub.updateMetadata(request, requiredEntry, myPathName)
sub.relink(request, subEntry, requiredEntry, myPathName)
return
}
sub.addInode(request, requiredEntry, myPathName)
}
func addFile(directory *filesystem.Directory, fileSystem, oldFS *FileSystem,
name string, directoryPathName string, stat *syscall.Stat_t) error {
inode, isNewInode := fileSystem.getInode(stat)
var file filesystem.File
file.Name = name
file.InodeNumber = stat.Ino
file.SetInode(inode)
if isNewInode {
err := scanFile(&file, fileSystem, directoryPathName)
if err != nil {
return err
}
if oldFS != nil && oldFS.InodeTable != nil {
if oldInode, found := oldFS.InodeTable[stat.Ino]; found {
if filesystem.CompareInodes(inode, oldInode, nil) {
inode = oldInode
file.SetInode(inode)
fileSystem.InodeTable[stat.Ino] = inode
}
}
}
}
directory.FileList = append(directory.FileList, &file)
return nil
}
func (sub *Sub) addInode(request *subproto.UpdateRequest,
requiredEntry *filesystem.DirectoryEntry, myPathName string) {
requiredInode := requiredEntry.Inode()
if name, ok := sub.inodesCreated[requiredEntry.InodeNumber]; ok {
makeHardlink(request, myPathName, name)
return
}
// Try to find a sibling inode.
names := sub.requiredFS.InodeToFilenamesTable()[requiredEntry.InodeNumber]
subFS := sub.FileSystem
if len(names) > 1 {
var sameDataInode filesystem.GenericInode
var sameDataName string
for _, name := range names {
if inum, found := subFS.FilenameToInodeTable()[name]; found {
subInode := sub.FileSystem.InodeTable[inum]
_, sameMetadata, sameData := filesystem.CompareInodes(
subInode, requiredInode, nil)
if sameMetadata && sameData {
makeHardlink(request, myPathName, name)
return
}
if sameData {
sameDataInode = subInode
sameDataName = name
}
}
}
if sameDataInode != nil {
sub.updateMetadata(request, requiredEntry, sameDataName)
makeHardlink(request, myPathName, sameDataName)
return
}
}
if inode, ok := requiredEntry.Inode().(*filesystem.RegularInode); ok {
if inode.Size > 0 {
if _, ok := sub.subObjectCacheUsage[inode.Hash]; ok {
sub.subObjectCacheUsage[inode.Hash]++
} else {
// Not in object cache: grab it from file-system.
request.FilesToCopyToCache = append(
request.FilesToCopyToCache,
sub.getFileToCopy(myPathName, inode.Hash))
sub.subObjectCacheUsage[inode.Hash] = 1
}
}
}
var inode subproto.Inode
inode.Name = myPathName
inode.GenericInode = requiredEntry.Inode()
request.InodesToMake = append(request.InodesToMake, inode)
sub.inodesCreated[requiredEntry.InodeNumber] = myPathName
}
func layerImages(baseFS *filesystem.FileSystem,
layerFS *filesystem.FileSystem) error {
for filename, layerInum := range layerFS.FilenameToInodeTable() {
layerInode := layerFS.InodeTable[layerInum]
if _, ok := layerInode.(*filesystem.DirectoryInode); ok {
continue
}
baseInum, ok := baseFS.FilenameToInodeTable()[filename]
if !ok {
return errors.New(filename + " missing in base image")
}
baseInode := baseFS.InodeTable[baseInum]
sameType, sameMetadata, sameData := filesystem.CompareInodes(baseInode,
layerInode, nil)
if !sameType {
return errors.New(filename + " changed type")
}
if sameMetadata && sameData {
continue
}
baseFS.InodeTable[baseInum] = layerInode
}
return nil
}
func compareFile(request *subproto.UpdateRequest, state *state,
subEntry interface{}, requiredFile *filesystem.File,
parentName string) {
debugFilename := path.Join(parentName, requiredFile.Name)
if subFile, ok := subEntry.(*filesystem.File); ok {
if requiredInode, ok :=
state.subInodeToRequiredInode[subFile.InodeNumber]; ok {
if requiredInode != requiredFile.InodeNumber {
fmt.Printf("Different links: %s...\n", debugFilename) // HACK
}
} else {
state.subInodeToRequiredInode[subFile.InodeNumber] =
requiredFile.InodeNumber
}
if filesystem.CompareInodes(subFile.Inode(), requiredFile.Inode(),
os.Stdout) {
return
}
fmt.Printf("Different file: %s...\n", debugFilename) // HACK
} else {
fmt.Printf("Add file: %s...\n", debugFilename) // HACK
}
// TODO(rgooch): Delete entry and replace.
}
func addInode(request *subproto.UpdateRequest, state *state,
requiredEntry *filesystem.DirectoryEntry, myPathName string) {
requiredInode := requiredEntry.Inode()
if name, ok := state.inodesCreated[requiredEntry.InodeNumber]; ok {
makeHardlink(request, myPathName, name)
return
}
// Try to find a sibling inode.
names := state.requiredFS.InodeToFilenamesTable[requiredEntry.InodeNumber]
if len(names) > 1 {
var sameDataInode filesystem.GenericInode
var sameDataName string
for _, name := range names {
if inum, found := state.getSubInodeFromFilename(name); found {
subInode := state.subFS.InodeTable[inum]
_, sameMetadata, sameData := filesystem.CompareInodes(
subInode, requiredInode, nil)
if sameMetadata && sameData {
makeHardlink(request, myPathName, name)
return
}
if sameData {
sameDataInode = subInode
sameDataName = name
}
}
}
if sameDataInode != nil {
updateMetadata(request, state, requiredEntry, sameDataName)
makeHardlink(request, myPathName, sameDataName)
return
}
}
if inode, ok := requiredEntry.Inode().(*filesystem.RegularInode); ok {
if inode.Size > 0 {
if _, ok := state.subObjectCacheUsage[inode.Hash]; ok {
state.subObjectCacheUsage[inode.Hash]++
} else {
// Not in object cache: grab it from file-system.
if state.subFS.HashToInodesTable == nil {
state.subFS.BuildHashToInodesTable()
}
if ilist, ok := state.subFS.HashToInodesTable[inode.Hash]; ok {
var fileToCopy subproto.FileToCopyToCache
fileToCopy.Name =
state.subFS.InodeToFilenamesTable[ilist[0]][0]
fileToCopy.Hash = inode.Hash
request.FilesToCopyToCache = append(
request.FilesToCopyToCache, fileToCopy)
state.subObjectCacheUsage[inode.Hash] = 1
} else {
panic("No object in cache for: " + myPathName)
}
}
}
}
var inode subproto.Inode
inode.Name = myPathName
inode.GenericInode = requiredEntry.Inode()
request.InodesToMake = append(request.InodesToMake, inode)
state.inodesCreated[requiredEntry.InodeNumber] = myPathName
}