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efs_executor.go
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/
efs_executor.go
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// +build !libstorage_storage_executor libstorage_storage_executor_efs
package executor
import (
"bufio"
"fmt"
"io"
"os"
"strings"
gofig "github.com/akutz/gofig/types"
"github.com/codedellemc/libstorage/api/context"
"github.com/codedellemc/libstorage/api/registry"
"github.com/codedellemc/libstorage/api/types"
"github.com/codedellemc/libstorage/drivers/storage/efs"
efsUtils "github.com/codedellemc/libstorage/drivers/storage/efs/utils"
)
// driver is the storage executor for the efs storage driver.
type driver struct {
config gofig.Config
}
const (
idDelimiter = "/"
mountinfoFormat = "%d %d %d:%d %s %s %s %s"
)
func init() {
registry.RegisterStorageExecutor(efs.Name, newDriver)
}
func newDriver() types.StorageExecutor {
return &driver{}
}
func (d *driver) Init(ctx types.Context, config gofig.Config) error {
d.config = config
return nil
}
func (d *driver) Name() string {
return efs.Name
}
// Supported returns a flag indicating whether or not the platform
// implementing the executor is valid for the host on which the executor
// resides.
func (d *driver) Supported(
ctx types.Context,
opts types.Store) (bool, error) {
return efsUtils.IsEC2Instance(ctx)
}
// InstanceID returns the local instance ID for the test
func InstanceID() (*types.InstanceID, error) {
return newDriver().InstanceID(context.Background(), nil)
}
// InstanceID returns the aws instance configuration
func (d *driver) InstanceID(
ctx types.Context,
opts types.Store) (*types.InstanceID, error) {
return efsUtils.InstanceID(ctx)
}
func (d *driver) NextDevice(
ctx types.Context,
opts types.Store) (string, error) {
return "", types.ErrNotImplemented
}
func (d *driver) LocalDevices(
ctx types.Context,
opts *types.LocalDevicesOpts) (*types.LocalDevices, error) {
mtt, err := parseMountTable()
if err != nil {
return nil, err
}
idmnt := make(map[string]string)
for _, mt := range mtt {
idmnt[mt.Source] = mt.MountPoint
}
return &types.LocalDevices{
Driver: efs.Name,
DeviceMap: idmnt,
}, nil
}
func parseMountTable() ([]*types.MountInfo, error) {
f, err := os.Open("/proc/self/mountinfo")
if err != nil {
return nil, err
}
defer f.Close()
return parseInfoFile(f)
}
func parseInfoFile(r io.Reader) ([]*types.MountInfo, error) {
var (
s = bufio.NewScanner(r)
out = []*types.MountInfo{}
)
for s.Scan() {
if err := s.Err(); err != nil {
return nil, err
}
var (
p = &types.MountInfo{}
text = s.Text()
optionalFields string
)
if _, err := fmt.Sscanf(text, mountinfoFormat,
&p.ID, &p.Parent, &p.Major, &p.Minor,
&p.Root, &p.MountPoint, &p.Opts, &optionalFields); err != nil {
return nil, fmt.Errorf("Scanning '%s' failed: %s", text, err)
}
// Safe as mountinfo encodes mountpoints with spaces as \040.
index := strings.Index(text, " - ")
postSeparatorFields := strings.Fields(text[index+3:])
if len(postSeparatorFields) < 3 {
return nil, fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
}
if optionalFields != "-" {
p.Optional = optionalFields
}
p.FSType = postSeparatorFields[0]
p.Source = postSeparatorFields[1]
p.VFSOpts = strings.Join(postSeparatorFields[2:], " ")
out = append(out, p)
}
return out, nil
}