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Enable sparseness only conditionally

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We can either preallocate storage for a file or sparsify it. This
detects a pack file as sparse if it contains an all zero block or
consists of only one block. As the file sparsification is just an
approximation, hide it behind a `--sparse` parameter.
This commit is contained in:
Michael Eischer
2022-08-07 17:26:46 +02:00
parent 3047bf611c
commit 5b6a77058a
9 changed files with 102 additions and 68 deletions
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10
internal/restorer/restorer.go
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@@ -16,8 +16,9 @@ import (
// Restorer is used to restore a snapshot to a directory.
type Restorer struct {
repo restic.Repository
sn *restic.Snapshot
repo restic.Repository
sn *restic.Snapshot
sparse bool
Error func(location string, err error) error
SelectFilter func(item string, dstpath string, node *restic.Node) (selectedForRestore bool, childMayBeSelected bool)
@@ -26,9 +27,10 @@ type Restorer struct {
var restorerAbortOnAllErrors = func(location string, err error) error { return err }
// NewRestorer creates a restorer preloaded with the content from the snapshot id.
func NewRestorer(ctx context.Context, repo restic.Repository, id restic.ID) (*Restorer, error) {
func NewRestorer(ctx context.Context, repo restic.Repository, id restic.ID, sparse bool) (*Restorer, error) {
r := &Restorer{
repo: repo,
sparse: sparse,
Error: restorerAbortOnAllErrors,
SelectFilter: func(string, string, *restic.Node) (bool, bool) { return true, true },
}
@@ -219,7 +221,7 @@ func (res *Restorer) RestoreTo(ctx context.Context, dst string) error {
}
idx := NewHardlinkIndex()
filerestorer := newFileRestorer(dst, res.repo.Backend().Load, res.repo.Key(), res.repo.Index().Lookup, res.repo.Connections())
filerestorer := newFileRestorer(dst, res.repo.Backend().Load, res.repo.Key(), res.repo.Index().Lookup, res.repo.Connections(), res.sparse)
filerestorer.Error = res.Error
debug.Log("first pass for %q", dst)