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package backup
import (
"code.laria.me/petrific/acl"
"code.laria.me/petrific/fs"
"code.laria.me/petrific/objects"
"code.laria.me/petrific/storage"
"fmt"
"io"
"math/rand"
"os"
)
func RestoreFile(s storage.Storage, id objects.ObjectId, w io.Writer) error {
file, err := storage.GetObjectOfType(s, id, objects.OTFile)
if err != nil {
return err
}
for i, fragment := range *file.(*objects.File) {
blob_obj, err := storage.GetObjectOfType(s, fragment.Blob, objects.OTBlob)
if err != nil {
return err
}
blob := *blob_obj.(*objects.Blob)
if uint64(len(blob)) != fragment.Size {
return fmt.Errorf("RestoreFile: blob size of %s doesn't match size in fragment %d of file %s", fragment.Blob, i, id)
}
if _, err := w.Write(blob); err != nil {
return err
}
}
return nil
}
func execBitFromACL(a acl.ACL) bool {
return a.ToUnixPerms()&0100 != 0
}
func RestoreDir(s storage.Storage, id objects.ObjectId, root fs.Dir) error {
tree_obj, err := storage.GetObjectOfType(s, id, objects.OTTree)
tree := tree_obj.(objects.Tree)
seen := make(map[string]struct{})
for name, file_info := range tree {
switch file_info.Type() {
case objects.TETFile:
tmpname := fmt.Sprintf(".petrific-%d-%08x%08x%08x%08x", os.Getpid(), rand.Uint32(), rand.Uint32(), rand.Uint32(), rand.Uint32())
new_file, err := root.CreateChildFile(tmpname, execBitFromACL(file_info.ACL()))
if err != nil {
return err
}
wc, err := new_file.OpenWritable()
if err != nil {
return err
}
if err := RestoreFile(s, file_info.(objects.TreeEntryFile).Ref, wc); err != nil {
wc.Close()
return err
}
wc.Close()
if err := root.RenameChild(tmpname, name); err != nil {
return err
}
case objects.TETDir:
var subdir fs.Dir
// Try to use existing directory
child, err := root.GetChild(name)
if err == nil {
if child.Type() == fs.FDir {
subdir = child.(fs.Dir)
} else {
if err := child.Delete(); err != nil {
return err
}
}
} else if err != os.ErrNotExist {
return err
}
// Create directory, if it doesn't exist
if subdir == nil {
subdir, err = root.CreateChildDir(name)
if err != nil {
return err
}
}
if err := RestoreDir(s, file_info.(objects.TreeEntryDir).Ref, subdir); err != nil {
return err
}
case objects.TETSymlink:
// Is there already a child of that name? If yes, delete it
child, err := root.GetChild(name)
if err == nil {
if err := child.Delete(); err != nil {
return err
}
} else if err != os.ErrNotExist {
return err
}
if _, err := root.CreateChildSymlink(name, file_info.(objects.TreeEntrySymlink).Target); err != nil {
return err
}
default:
return fmt.Errorf("child '%s' of %s has unknown tree entry type %s", name, id, file_info.Type())
}
seen[name] = struct{}{}
}
// We now restored all children, we now need to remove the children of root, that shouldn't be there accoring to the backup
children, err := root.Readdir()
if err != nil {
return err
}
for _, c := range children {
_, ok := seen[c.Name()]
if !ok {
if err := c.Delete(); err != nil {
return err
}
}
}
return nil
}
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