72 lines
2 KiB
Go
72 lines
2 KiB
Go
package daemon
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import (
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"fmt"
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"path/filepath"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/container"
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"github.com/docker/docker/pkg/graphdb"
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)
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// migrateLegacySqliteLinks migrates sqlite links to use links from HostConfig
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// when sqlite links were used, hostConfig.Links was set to nil
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func (daemon *Daemon) migrateLegacySqliteLinks(db *graphdb.Database, container *container.Container) error {
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// if links is populated (or an empty slice), then this isn't using sqlite links and can be skipped
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if container.HostConfig == nil || container.HostConfig.Links != nil {
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return nil
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}
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logrus.Debugf("migrating legacy sqlite link info for container: %s", container.ID)
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fullName := container.Name
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if fullName[0] != '/' {
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fullName = "/" + fullName
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}
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// don't use a nil slice, this ensures that the check above will skip once the migration has completed
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links := []string{}
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children, err := db.Children(fullName, 0)
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if err != nil {
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if !strings.Contains(err.Error(), "Cannot find child for") {
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return err
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}
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// else continue... it's ok if we didn't find any children, it'll just be nil and we can continue the migration
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}
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for _, child := range children {
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c, err := daemon.GetContainer(child.Entity.ID())
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if err != nil {
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return err
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}
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links = append(links, c.Name+":"+child.Edge.Name)
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}
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container.HostConfig.Links = links
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return container.WriteHostConfig()
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}
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// sqliteMigration performs the link graph DB migration.
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func (daemon *Daemon) sqliteMigration(containers map[string]*container.Container) error {
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// migrate any legacy links from sqlite
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linkdbFile := filepath.Join(daemon.root, "linkgraph.db")
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var (
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legacyLinkDB *graphdb.Database
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err error
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)
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legacyLinkDB, err = graphdb.NewSqliteConn(linkdbFile)
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if err != nil {
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return fmt.Errorf("error connecting to legacy link graph DB %s, container links may be lost: %v", linkdbFile, err)
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}
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defer legacyLinkDB.Close()
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for _, c := range containers {
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if err := daemon.migrateLegacySqliteLinks(legacyLinkDB, c); err != nil {
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return err
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}
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}
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return nil
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}
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