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[24.0 backport] daemon: overlay2: Write layer metadata atomically #46703

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merged 1 commit into from Oct 24, 2023
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[24.0 backport] daemon: overlay2: Write layer metadata atomically #46703

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7 changes: 4 additions & 3 deletions daemon/graphdriver/overlay2/overlay.go
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Expand Up @@ -23,6 +23,7 @@ import (
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/quota"
units "github.com/docker/go-units"
Expand Down Expand Up @@ -386,7 +387,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
}

// Write link id to link file
if err := os.WriteFile(path.Join(dir, "link"), []byte(lid), 0644); err != nil {
if err := ioutils.AtomicWriteFile(path.Join(dir, "link"), []byte(lid), 0o644); err != nil {
return err
}

Expand All @@ -399,7 +400,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
return err
}

if err := os.WriteFile(path.Join(d.dir(parent), "committed"), []byte{}, 0600); err != nil {
if err := ioutils.AtomicWriteFile(path.Join(d.dir(parent), "committed"), []byte{}, 0o600); err != nil {
return err
}

Expand All @@ -408,7 +409,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
return err
}
if lower != "" {
if err := os.WriteFile(path.Join(dir, lowerFile), []byte(lower), 0666); err != nil {
if err := ioutils.AtomicWriteFile(path.Join(dir, lowerFile), []byte(lower), 0o666); err != nil {
return err
}
}
Expand Down