// Must run inside mutex.
func (me *memNode) promote() {
if me.backing == "" {
me.backing = me.fs.getFilename()
destfs := pathfs.NewLoopbackFileSystem("/")
pathfs.CopyFile(me.fs.readonly, destfs,
me.original, strings.TrimLeft(me.backing, "/"), nil)
me.original = ""
files := me.Inode().Files(0)
for _, f := range files {
mf := f.File.(*memNodeFile)
inner := mf.File
osFile, err := os.Open(me.backing)
if err != nil {
panic("error opening backing file")
}
mf.File = nodefs.NewLoopbackFile(osFile)
inner.Flush()
inner.Release()
}
}
}
func (fs *unionFS) Promote(name string, srcResult branchResult, context *fuse.Context) (code fuse.Status) {
writable := fs.fileSystems[0]
sourceFs := fs.fileSystems[srcResult.branch]
// Promote directories.
fs.promoteDirsTo(name)
if srcResult.attr.IsRegular() {
code = pathfs.CopyFile(sourceFs, writable, name, name, context)
if code.Ok() {
code = writable.Chmod(name, srcResult.attr.Mode&07777|0200, context)
}
if code.Ok() {
aTime := srcResult.attr.AccessTime()
mTime := srcResult.attr.ModTime()
code = writable.Utimens(name, &aTime, &mTime, context)
}
files := fs.nodeFs.AllFiles(name, 0)
for _, fileWrapper := range files {
if !code.Ok() {
break
}
var uf *unionFsFile
f := fileWrapper.File
for f != nil {
ok := false
uf, ok = f.(*unionFsFile)
if ok {
break
}
f = f.InnerFile()
}
if uf == nil {
panic("no unionFsFile found inside")
}
if uf.layer > 0 {
uf.layer = 0
f := uf.File
uf.File, code = fs.fileSystems[0].Open(name, fileWrapper.OpenFlags, context)
f.Flush()
f.Release()
}
}
} else if srcResult.attr.IsSymlink() {
link := ""
link, code = sourceFs.Readlink(name, context)
if !code.Ok() {
log.Println("can't read link in source fs", name)
} else {
code = writable.Symlink(link, name, context)
}
} else if srcResult.attr.IsDir() {
code = writable.Mkdir(name, srcResult.attr.Mode&07777|0200, context)
} else {
log.Println("Unknown file type:", srcResult.attr)
return fuse.ENOSYS
}
if !code.Ok() {
fs.branchCache.GetFresh(name)
return code
} else {
r := fs.getBranch(name)
r.branch = 0
fs.branchCache.Set(name, r)
}
return fuse.OK
}