File 0007-bsc1214855-volume-use-AtomicWriteFile-to-save-volume.patch of Package docker
From 62035ba22a45bde6bed2da321e7ad954f5b461b4 Mon Sep 17 00:00:00 2001
From: Aleksa Sarai <cyphar@cyphar.com>
Date: Wed, 19 Jun 2024 16:30:49 +1000
Subject: [PATCH 7/7] bsc1214855: volume: use AtomicWriteFile to save volume
options
If the system (or Docker) crashes while saivng the volume options, on
restart the daemon will error out when trying to read the options file
because it doesn't contain valid JSON.
In such a crash scenario, the new volume will be treated as though it
has the default options configuration. This is not ideal, but volumes
created on very old Docker versions (pre-1.11[1], circa 2016) do not
have opts.json and so doing some kind of cleanup when loading the volume
store (even if we take care to only delete empty volumes) could delete
existing volumes carried over from very old Docker versions that users
would not expect to disappear.
Ultimately, if a user creates a volume and the system crashes, a volume
that has the wrong config is better than Docker not being able to start.
[1]: commit b05b2370757d ("Support mount opts for `local` volume driver")
SUSE-Bugs: https://bugzilla.suse.com/show_bug.cgi?id=1214855
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
---
volume/local/local.go | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/volume/local/local.go b/volume/local/local.go
index 6e96aeea4189..4412f34a3da9 100644
--- a/volume/local/local.go
+++ b/volume/local/local.go
@@ -17,6 +17,7 @@ import (
"github.com/docker/docker/daemon/names"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/idtools"
+ "github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/quota"
"github.com/docker/docker/volume"
"github.com/pkg/errors"
@@ -388,7 +389,7 @@ func (v *localVolume) saveOpts() error {
if err != nil {
return err
}
- err = os.WriteFile(filepath.Join(v.rootPath, "opts.json"), b, 0o600)
+ err = ioutils.AtomicWriteFile(filepath.Join(v.rootPath, "opts.json"), b, 0o600)
if err != nil {
return errdefs.System(errors.Wrap(err, "error while persisting volume options"))
}
--
2.45.2
