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Ensure parent dir exists for mount cleanup file

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While investigating a test failure, I found this in the logs:

```
time="2019-07-04T15:06:32.622506760Z" level=warning msg="Error while setting daemon root propagation, this is not generally critical but may cause some functionality to not work or fallback to less desirable behavior" dir=/go/src/github.com/docker/docker/bundles/test-integration/d1285b8250308/root error="error writing file to signal mount cleanup on shutdown: open /tmp/dxr/d1285b8250308/unmount-on-shutdown: no such file or directory"
```

This path is generated from the daemon's exec-root, which appears to not
exist yet. This change just makes sure it exists before we try to write
a file.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
(cherry picked from commit 7725b88edc)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Brian Goff 2019-07-11 13:30:36 -07:00 committed by Sebastiaan van Stijn
parent 6ffb8e2b67
commit c67edc5d61
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1 changed files with 4 additions and 0 deletions
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4
daemon/daemon_unix.go
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@ -1265,6 +1265,10 @@ func setupDaemonRootPropagation(cfg *config.Config) error {
return nil
}
if err := os.MkdirAll(filepath.Dir(cleanupFile), 0700); err != nil {
return errors.Wrap(err, "error creating dir to store mount cleanup file")
}
if err := ioutil.WriteFile(cleanupFile, nil, 0600); err != nil {
return errors.Wrap(err, "error writing file to signal mount cleanup on shutdown")
}