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moby--moby/daemon/links_linux.go
John Howard 3f6127b173 Windows: Factor out sqlite
Signed-off-by: John Howard <jhoward@microsoft.com>
2016-12-01 09:38:08 -08:00

72 lines
2 KiB
Go

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