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package backup
import (
"code.laria.me/petrific/cache"
"code.laria.me/petrific/fs"
"code.laria.me/petrific/objects"
"code.laria.me/petrific/storage"
"io"
"time"
)
func WriteDir(
store storage.Storage,
abspath string,
d fs.Dir,
pcache cache.Cache,
) (objects.ObjectId, error) {
children, err := d.Readdir()
if err != nil {
return objects.ObjectId{}, err
}
infos := make(objects.Tree)
for _, c := range children {
var info objects.TreeEntry
switch c.Type() {
case fs.FFile:
mtime, file_id, ok := pcache.PathUpdated(abspath)
if !ok || mtime.Before(c.ModTime()) {
// According to cache the file was changed
rwc, err := c.(fs.RegularFile).Open()
if err != nil {
return objects.ObjectId{}, err
}
file_id, err = WriteFile(store, rwc)
rwc.Close()
if err != nil {
return objects.ObjectId{}, err
}
pcache.SetPathUpdated(abspath+"/"+c.Name(), c.ModTime(), file_id)
}
info = objects.NewTreeEntryFile(file_id, c.Executable())
case fs.FDir:
subtree_id, err := WriteDir(store, abspath+"/"+c.Name(), c.(fs.Dir), pcache)
if err != nil {
return objects.ObjectId{}, err
}
info = objects.NewTreeEntryDir(subtree_id, c.Executable())
case fs.FSymlink:
target, err := c.(fs.Symlink).Readlink()
if err != nil {
return objects.ObjectId{}, err
}
info = objects.NewTreeEntrySymlink(target, c.Executable())
}
if info != nil {
infos[c.Name()] = info
}
}
return storage.SetObject(store, objects.ToRawObject(infos))
}
const BlobChunkSize = 16 * 1024 * 1024 // 16MB
func WriteFile(store storage.Storage, r io.Reader) (objects.ObjectId, error) {
// Right now we will create the file as fixed chunks of size BlobChunkSize
// It Would be more efficient to use a dynamic/content aware chunking method but this can be added later.
// The way files are serialized allows for any chunk size and addition of more properties in the future while staying compatible
fragments := make(objects.File, 0)
read_buf := make([]byte, BlobChunkSize)
for {
n, err := io.ReadFull(r, read_buf)
if err == nil || err == io.ErrUnexpectedEOF {
content := objects.Blob(read_buf[:n])
blob_id, err := storage.SetObject(store, objects.ToRawObject(&content))
if err != nil {
return objects.ObjectId{}, err
}
fragments = append(fragments, objects.FileFragment{Blob: blob_id, Size: uint64(n)})
} else if err == io.EOF {
break
} else {
return objects.ObjectId{}, err
}
}
return storage.SetObject(store, objects.ToRawObject(&fragments))
}
func CreateSnapshot(
store storage.Storage,
tree_id objects.ObjectId,
date time.Time,
archive string,
comment string,
) (objects.ObjectId, error) {
return storage.SetObject(store, objects.ToRawObject(&objects.Snapshot{
Tree: tree_id,
Date: date,
Archive: archive,
Comment: comment,
}))
}
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