1981706196
The migration code is in the 22.06 branch, and if we don't migrate the only side-effect is the daemon's ID being regenerated (as a UUID). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
32 lines
983 B
Go
32 lines
983 B
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"os"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/google/uuid"
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"github.com/pkg/errors"
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)
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// loadOrCreateID loads the engine's ID from idPath, or generates a new ID
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// if it doesn't exist. It returns the ID, and any error that occurred when
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// saving the file.
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//
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// Note that this function expects the daemon's root directory to already have
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// been created with the right permissions and ownership (usually this would
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// be done by daemon.CreateDaemonRoot().
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func loadOrCreateID(idPath string) (string, error) {
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var id string
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idb, err := os.ReadFile(idPath)
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if os.IsNotExist(err) {
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id = uuid.New().String()
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if err := ioutils.AtomicWriteFile(idPath, []byte(id), os.FileMode(0600)); err != nil {
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return "", errors.Wrap(err, "error saving ID file")
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}
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} else if err != nil {
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return "", errors.Wrapf(err, "error loading ID file %s", idPath)
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} else {
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id = string(idb)
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}
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return id, nil
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}
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