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update.go
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update.go
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package lib
import (
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/Cloud-Foundations/Dominator/lib/constants"
"github.com/Cloud-Foundations/Dominator/lib/filesystem"
"github.com/Cloud-Foundations/Dominator/lib/filesystem/scanner"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
"github.com/Cloud-Foundations/Dominator/lib/hash"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/Dominator/lib/objectcache"
"github.com/Cloud-Foundations/Dominator/lib/triggers"
"github.com/Cloud-Foundations/Dominator/lib/wsyscall"
"github.com/Cloud-Foundations/Dominator/proto/sub"
)
func (t *uType) update(request sub.UpdateRequest,
oldTriggers *triggers.Triggers) error {
if request.Triggers == nil {
request.Triggers = triggers.New()
}
t.copyFilesToCache(request.FilesToCopyToCache)
t.makeObjectCopies(request.MultiplyUsedObjects)
if t.runTriggers != nil &&
oldTriggers != nil && len(oldTriggers.Triggers) > 0 {
t.makeDirectories(request.DirectoriesToMake,
oldTriggers, false)
t.makeInodes(request.InodesToMake, request.MultiplyUsedObjects,
oldTriggers, false)
t.makeHardlinks(request.HardlinksToMake, oldTriggers, false)
t.doDeletes(request.PathsToDelete, oldTriggers, false)
t.changeInodes(request.InodesToChange, oldTriggers, false)
matchedOldTriggers := oldTriggers.GetMatchedTriggers()
if t.runTriggers(matchedOldTriggers, "stop", t.logger) {
t.hadTriggerFailures = true
}
}
fsChangeStartTime := time.Now()
t.makeDirectories(request.DirectoriesToMake, request.Triggers, true)
t.makeInodes(request.InodesToMake, request.MultiplyUsedObjects,
request.Triggers, true)
t.makeHardlinks(request.HardlinksToMake, request.Triggers, true)
t.doDeletes(request.PathsToDelete, request.Triggers, true)
t.changeInodes(request.InodesToChange, request.Triggers, true)
if err := t.writePatchedImageName(request.ImageName); err != nil {
t.logger.Println(err)
}
t.fsChangeDuration = time.Since(fsChangeStartTime)
matchedNewTriggers := request.Triggers.GetMatchedTriggers()
if t.runTriggers != nil &&
t.runTriggers(matchedNewTriggers, "start", t.logger) {
t.hadTriggerFailures = true
}
return t.lastError
}
func (t *uType) copyFilesToCache(filesToCopyToCache []sub.FileToCopyToCache) {
for _, fileToCopy := range filesToCopyToCache {
sourcePathname := filepath.Join(t.rootDirectoryName, fileToCopy.Name)
destPathname := filepath.Join(t.objectsDir,
objectcache.HashToFilename(fileToCopy.Hash))
prefix := "Copied"
if fileToCopy.DoHardlink {
prefix = "Hardlinked"
}
if err := copyFile(destPathname, sourcePathname,
fileToCopy.DoHardlink); err != nil {
t.lastError = err
t.logger.Println(err)
} else {
t.logger.Printf("%s: %s to cache\n", prefix, sourcePathname)
}
}
}
func copyFile(destPathname, sourcePathname string, doHardlink bool) error {
dirname := filepath.Dir(destPathname)
if err := os.MkdirAll(dirname, syscall.S_IRWXU); err != nil {
return err
}
if doHardlink {
return fsutil.ForceLink(sourcePathname, destPathname)
}
sourceFile, err := os.Open(sourcePathname)
if err != nil {
return err
}
defer sourceFile.Close()
destFile, err := os.Create(destPathname)
if err != nil {
return err
}
defer destFile.Close()
_, err = io.Copy(destFile, sourceFile)
return err
}
func (t *uType) makeObjectCopies(multiplyUsedObjects map[hash.Hash]uint64) {
for hash, numCopies := range multiplyUsedObjects {
if numCopies < 2 {
continue
}
objectPathname := filepath.Join(t.objectsDir,
objectcache.HashToFilename(hash))
for numCopies--; numCopies > 0; numCopies-- {
ext := fmt.Sprintf("~%d~", numCopies)
if err := copyFile(objectPathname+ext, objectPathname,
false); err != nil {
t.lastError = err
t.logger.Println(err)
} else {
t.logger.Printf("Copied object: %x%s\n", hash, ext)
}
}
}
}
func (t *uType) makeInodes(inodesToMake []sub.Inode,
multiplyUsedObjects map[hash.Hash]uint64, triggers *triggers.Triggers,
takeAction bool) {
for _, inode := range inodesToMake {
fullPathname := filepath.Join(t.rootDirectoryName, inode.Name)
triggers.Match(inode.Name)
if takeAction {
var err error
switch inode := inode.GenericInode.(type) {
case *filesystem.RegularInode:
err = makeRegularInode(fullPathname, inode, multiplyUsedObjects,
t.objectsDir, t.logger)
case *filesystem.SymlinkInode:
err = makeSymlinkInode(fullPathname, inode, t.logger)
case *filesystem.SpecialInode:
err = makeSpecialInode(fullPathname, inode, t.logger)
}
if err != nil {
t.lastError = err
}
}
}
}
func makeRegularInode(fullPathname string,
inode *filesystem.RegularInode, multiplyUsedObjects map[hash.Hash]uint64,
objectsDir string, logger log.Logger) error {
var objectPathname string
if inode.Size > 0 {
objectPathname = filepath.Join(objectsDir,
objectcache.HashToFilename(inode.Hash))
numCopies := multiplyUsedObjects[inode.Hash]
if numCopies > 1 {
numCopies--
objectPathname += fmt.Sprintf("~%d~", numCopies)
if numCopies < 2 {
delete(multiplyUsedObjects, inode.Hash)
} else {
multiplyUsedObjects[inode.Hash] = numCopies
}
}
} else {
objectPathname = fmt.Sprintf("%s.empty.%d", fullPathname, os.Getpid())
if file, err := os.OpenFile(objectPathname,
os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600); err != nil {
return err
} else {
file.Close()
}
}
if err := fsutil.ForceRename(objectPathname, fullPathname); err != nil {
logger.Println(err)
return err
}
if err := inode.WriteMetadata(fullPathname); err != nil {
logger.Println(err)
return err
} else {
if inode.Size > 0 {
logger.Printf("Made inode: %s from: %x\n",
fullPathname, inode.Hash)
} else {
logger.Printf("Made empty inode: %s\n", fullPathname)
}
}
return nil
}
func makeSymlinkInode(fullPathname string,
inode *filesystem.SymlinkInode, logger log.Logger) error {
if err := inode.Write(fullPathname); err != nil {
logger.Println(err)
return err
}
logger.Printf("Made symlink inode: %s -> %s\n", fullPathname, inode.Symlink)
return nil
}
func makeSpecialInode(fullPathname string, inode *filesystem.SpecialInode,
logger log.Logger) error {
if err := inode.Write(fullPathname); err != nil {
logger.Println(err)
return err
}
logger.Printf("Made special inode: %s\n", fullPathname)
return nil
}
func (t *uType) makeHardlinks(hardlinksToMake []sub.Hardlink,
triggers *triggers.Triggers, takeAction bool) {
tmpName := filepath.Join(t.objectsDir, "temporaryHardlink")
for _, hardlink := range hardlinksToMake {
triggers.Match(hardlink.NewLink)
if takeAction {
targetPathname := filepath.Join(t.rootDirectoryName,
hardlink.Target)
linkPathname := filepath.Join(t.rootDirectoryName, hardlink.NewLink)
// A Link directly to linkPathname will fail if it exists, so do a
// Link+Rename using a temporary filename.
if err := fsutil.ForceLink(targetPathname, tmpName); err != nil {
t.lastError = err
t.logger.Println(err)
continue
}
if err := fsutil.ForceRename(tmpName, linkPathname); err != nil {
t.logger.Println(err)
if err := fsutil.ForceRemove(tmpName); err != nil {
t.lastError = err
t.logger.Println(err)
}
} else {
t.logger.Printf("Linked: %s => %s\n",
linkPathname, targetPathname)
}
}
}
}
func (t *uType) doDeletes(pathsToDelete []string, triggers *triggers.Triggers,
takeAction bool) {
for _, pathname := range pathsToDelete {
fullPathname := filepath.Join(t.rootDirectoryName, pathname)
triggers.Match(pathname)
if takeAction {
if err := fsutil.ForceRemoveAll(fullPathname); err != nil {
t.lastError = err
t.logger.Println(err)
} else {
t.logger.Printf("Deleted: %s\n", fullPathname)
}
}
}
}
func (t *uType) makeDirectories(directoriesToMake []sub.Inode,
triggers *triggers.Triggers, takeAction bool) {
for _, newdir := range directoriesToMake {
if t.skipPath(newdir.Name) {
continue
}
fullPathname := filepath.Join(t.rootDirectoryName, newdir.Name)
triggers.Match(newdir.Name)
if takeAction {
inode, ok := newdir.GenericInode.(*filesystem.DirectoryInode)
if !ok {
t.logger.Println("%s is not a directory!\n", newdir.Name)
continue
}
if err := inode.Write(fullPathname); err != nil {
t.lastError = err
t.logger.Println(err)
} else {
t.logger.Printf("Made directory: %s (mode=%s)\n",
fullPathname, inode.Mode)
}
}
}
}
func (t *uType) changeInodes(inodesToChange []sub.Inode,
triggers *triggers.Triggers, takeAction bool) {
for _, inode := range inodesToChange {
fullPathname := filepath.Join(t.rootDirectoryName, inode.Name)
if checkNonMtimeChange(fullPathname, inode.GenericInode) {
triggers.Match(inode.Name)
}
if takeAction {
if err := filesystem.ForceWriteMetadata(inode,
fullPathname); err != nil {
t.lastError = err
t.logger.Println(err)
continue
}
t.logger.Printf("Changed inode: %s\n", fullPathname)
}
}
}
func checkNonMtimeChange(filename string, inode filesystem.GenericInode) bool {
switch inode := inode.(type) {
case *filesystem.RegularInode:
var stat wsyscall.Stat_t
if err := wsyscall.Lstat(filename, &stat); err != nil {
return true
}
if stat.Mode&syscall.S_IFMT == syscall.S_IFREG {
oldInode := scanner.MakeRegularInode(&stat)
oldInode.Hash = inode.Hash
oldInode.MtimeNanoSeconds = inode.MtimeNanoSeconds
oldInode.MtimeSeconds = inode.MtimeSeconds
if *oldInode == *inode {
return false
}
}
case *filesystem.SpecialInode:
var stat wsyscall.Stat_t
if err := wsyscall.Lstat(filename, &stat); err != nil {
return true
}
if stat.Mode&syscall.S_IFMT == syscall.S_IFBLK ||
stat.Mode&syscall.S_IFMT == syscall.S_IFCHR {
oldInode := scanner.MakeSpecialInode(&stat)
oldInode.MtimeNanoSeconds = inode.MtimeNanoSeconds
oldInode.MtimeSeconds = inode.MtimeSeconds
if *oldInode == *inode {
return false
}
}
}
return true
}
func (t *uType) skipPath(pathname string) bool {
if t.skipFilter.Match(pathname) {
return true
}
if pathname == "/.subd" {
return true
}
if strings.HasPrefix(pathname, "/.subd/") {
return true
}
return false
}
func (t *uType) writePatchedImageName(imageName string) error {
pathname := filepath.Join(t.rootDirectoryName,
constants.PatchedImageNameFile)
if imageName == "" {
if err := os.Remove(pathname); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
}
if err := os.MkdirAll(filepath.Dir(pathname), fsutil.DirPerms); err != nil {
return err
}
buffer := &bytes.Buffer{}
fmt.Fprintln(buffer, imageName)
return fsutil.CopyToFile(pathname, fsutil.PublicFilePerms, buffer, 0)
}