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package shell
import (
"context"
"flag"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"io"
)
func init() {
Commands = append(Commands, &commandRemoteUnmount{})
}
type commandRemoteUnmount struct {
}
func (c *commandRemoteUnmount) Name() string {
return "remote.unmount"
}
func (c *commandRemoteUnmount) Help() string {
return `unmount remote storage
# assume a remote storage is configured to name "s3_1"
remote.configure -name=s3_1 -type=s3 -access_key=xxx -secret_key=yyy
# mount and pull one bucket
remote.mount -dir=/xxx -remote=s3_1/bucket
# unmount the mounted directory and remove its cache
# Make sure you have stopped "weed filer.remote.sync" first!
# Otherwise, the deletion will also be propagated to the remote storage!!!
remote.unmount -dir=/xxx -iHaveStoppedRemoteSync
`
}
func (c *commandRemoteUnmount) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
dir := remoteMountCommand.String("dir", "", "a directory in filer")
hasStoppedRemoteSync := remoteMountCommand.Bool("iHaveStoppedRemoteSync", false, "confirm to stop weed filer.remote.sync first")
if err = remoteMountCommand.Parse(args); err != nil {
return nil
}
mappings, listErr := filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress)
if listErr != nil {
return listErr
}
if *dir == "" {
return jsonPrintln(writer, mappings)
}
_, found := mappings.Mappings[*dir]
if !found {
return fmt.Errorf("directory %s is not mounted", *dir)
}
if !*hasStoppedRemoteSync {
return fmt.Errorf("make sure \"weed filer.remote.sync\" is stopped to avoid data loss")
}
// purge mounted data
if err = c.purgeMountedData(commandEnv, *dir); err != nil {
return fmt.Errorf("purge mounted data: %v", err)
}
// store a mount configuration in filer
if err = c.deleteMountMapping(commandEnv, *dir); err != nil {
return fmt.Errorf("delete mount mapping: %v", err)
}
return nil
}
func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir string) error {
// find existing directory, and ensure the directory is empty
err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
parent, name := util.FullPath(dir).DirAndName()
lookupResp, lookupErr := client.LookupDirectoryEntry(context.Background(), &filer_pb.LookupDirectoryEntryRequest{
Directory: parent,
Name: name,
})
if lookupErr != nil {
return fmt.Errorf("lookup %s: %v", dir, lookupErr)
}
oldEntry := lookupResp.Entry
deleteError := filer_pb.DoRemove(client, parent, name, true, true, true, false, nil)
if deleteError != nil {
return fmt.Errorf("delete %s: %v", dir, deleteError)
}
mkdirErr := filer_pb.DoMkdir(client, parent, name, func(entry *filer_pb.Entry) {
entry.Attributes = oldEntry.Attributes
entry.Extended = oldEntry.Extended
})
if mkdirErr != nil {
return fmt.Errorf("mkdir %s: %v", dir, mkdirErr)
}
return nil
})
if err != nil {
return err
}
return nil
}
func (c *commandRemoteUnmount) deleteMountMapping(commandEnv *CommandEnv, dir string) (err error) {
// read current mapping
var oldContent, newContent []byte
err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
oldContent, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE)
return err
})
if err != nil {
if err != filer_pb.ErrNotFound {
return fmt.Errorf("read existing mapping: %v", err)
}
}
// add new mapping
newContent, err = filer.RemoveRemoteStorageMapping(oldContent, dir)
if err != nil {
return fmt.Errorf("delete mount %s: %v", dir, err)
}
// save back
err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
return filer.SaveInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE, newContent)
})
if err != nil {
return fmt.Errorf("save mapping: %v", err)
}
return nil
}
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