Address a few issues

Dockerfile

@@ -11,5 +11,5 @@ CMD ["/go/bin/docker-volume-linode"]
 
 FROM alpine
 COPY --from=builder /go/bin/docker-volume-linode .
-RUN apk update && apk add ca-certificates e2fsprogs
+RUN apk update && apk add ca-certificates e2fsprogs xfsprogs btrfs-progs util-linux
 CMD ["./docker-volume-linode"]

Makefile

@@ -10,7 +10,6 @@ DOCKER_PASSWORD ?= xxxxx
 
 # Test Arguments
 TEST_TOKEN ?= xyz
-TEST_REGION ?= xyz
 TEST_LABEL ?= xyz
 
 GOPATH=$(shell go env GOPATH)
@@ -82,16 +81,15 @@ test-use-volume:
 	docker run --rm -i -v test-volume-default-size:/mnt busybox test -f /mnt/abc.txt || false
 
 test-pre-check:
-	@if [ "${TEST_TOKEN}" = "xyz" ] || [ "${TEST_REGION}" = "xyz" ] || [ "${TEST_LABEL}" = "xyz" ] ; then \
+	@if [ "${TEST_TOKEN}" = "xyz" ] || [ "${TEST_LABEL}" = "xyz" ] ; then \
 		echo -en "#############################\nYou must set TEST_* Variables\n#############################\n"; exit 1; fi
 
 test-setup:
-	@docker plugin set $(PLUGIN_NAME) LINODE_TOKEN=${TEST_TOKEN} LINODE_REGION=${TEST_REGION} LINODE_LABEL=${TEST_LABEL}
-	docker plugin enable  $(PLUGIN_NAME)
+	@docker plugin set $(PLUGIN_NAME) LINODE_TOKEN=${TEST_TOKEN} LINODE_LABEL=${TEST_LABEL}
+	docker plugin enable $(PLUGIN_NAME)
 
 check:
 	# Tools
-
 	GO111MODULE=off go get -u github.com/tsenart/deadcode
 	GO111MODULE=off go get -u github.com/kisielk/errcheck
 	GO111MODULE=off go get -u golang.org/x/lint/golint

README.md

@@ -28,16 +28,14 @@ The plugin can also be configured (or reconfigured) in multiple steps.
 docker plugin install --alias linode linode/docker-volume-linode
 docker plugin disable linode
 docker plugin set linode linode-token=<linode token>
-docker plugin set linode linode-region=<linode region>
 docker plugin set linode linode-label=<linode label>
 docker plugin enable linode
 ```
 
 - \<linode token\>: You will need a Linode APIv4 Personal Access Token.  Get one here: <https://developers.linode.com/api/v4#section/Personal-Access-Token>.  The API Token must have Read/Write permission for Volumes and Linodes.
-- \<linode regions\>: `us-east`, `us-central`, `us-west`, `eu-west`, `eu-central`, `ap-south`, `ap-northeast`.  [Some Linode regions do not have Block Storage Volume support](https://www.linode.com/community/questions/344/when-will-block-storage-be-available-in-my-datacenter), such as: `us-southeast` and `ap-northeast-1a`.
-- \<linode label\>: The label given to the host Linode Control Panel.
-- For a complete list of regions:  https://api.linode.com/v4/regions
-- For all options see "Driver Options" section
+- \<linode label\>: The label given to the host Linode Control Panel. Defaults to the system hostname.
+  [Some Linode regions do not have Block Storage Volume support](https://www.linode.com/community/questions/344/when-will-block-storage-be-available-in-my-datacenter), such as: `us-southeast` and `ap-northeast-1a`.  For a complete list of regions:  https://api.linode.com/v4/regions
+- For all options see [Driver Options](#Driver-Options) section
 
 ### Docker Swarm
 
@@ -56,9 +54,17 @@ $ docker volume create -d linode my-test-volume
 my-test-volume
 ```
 
+If a named volume already exists on the Linode account and it is in the same region of the Linode, it will be reattached if possible.  A Linode Volume can be attached to a single Linode at a time.
+
 #### Create Options
 
-This driver offers `size` as [driver specific option](https://docs.docker.com/engine/reference/commandline/volume_create/#driver-specific-options).  The `size` option specifies the size (in GB) of the volume to be created.  Volumes must be at least 10GB in size, so the default is 10GB.
+The driver offers [driver specific volume create options](https://docs.docker.com/engine/reference/commandline/volume_create/#driver-specific-options):
+
+| Option | Type | Default | Description |
+| ---    | ---  | ---     | ---         |
+| `size` | int  | `10`    | the size (in GB) of the volume to be created.  Volumes must be at least 10GB in size, so the default is 10GB.
+| `filesystem` | string | `ext4` | the filesystem argument for `mkfs` when formating the new (raw) volume (xfs, btrfs, ext4)
+| `delete-on-remove` | bool | `false`| if the Linode volume should be deleted when removed
 
 ```sh
 $ docker volume create -o size=50 -d linode my-test-volume-50
@@ -71,6 +77,13 @@ Volumes can also be created and attached from `docker run`:
 docker run -it --rm --mount volume-driver=linode,source=test-vol,destination=/test,volume-opt=size=25 alpine
 ```
 
+Multiple create options can be supplied:
+
+```sh
+docker run -it --rm --mount volume-driver=linode,source=test-vol,destination=/test,volume-opt=size=25,volume-opt=filesystem=btrfs,volume-opt=delete-on-remove=true alpine
+```
+
+
 ### List Volumes
 
 ```sh
@@ -103,7 +116,6 @@ my-test-volume-50
 | --- | --- |
 | linode-token | **Required** The Linode APIv4 [Personal Access Token](https://cloud.linode.com/profile/tokens)
 | linode-label | The Linode Label to attach block storage volumes to (defaults to the system hostname) |
-| linode-region | The Linode region to create volumes in (inferred if using linode-label, defaults to us-west) |
 | socket-file | Sets the socket file/address (defaults to /run/docker/plugins/linode.sock) |
 | socket-gid | Sets the socket GID (defaults to 0) |
 | mount-root | Sets the root directory for volume mounts (default /mnt) |
@@ -119,7 +131,7 @@ Options can be set once for all future uses with [`docker plugin set`](https://d
 ### Run the driver
 
 ```sh
-docker-volume-linode --linode-token=<token from linode console> --linode-region=<linode region> --linode-label=<linode label>
+docker-volume-linode --linode-token=<token from linode console> --linode-label=<linode label>
 ```
 
 ### Debugging
@@ -135,7 +147,7 @@ docker plugin set docker-volume-linode LOG_LEVEL=debug
 #### Enable Debug Level in manual installation
 
 ```sh
-docker-volume-linode --linode-token=<...> --linode-region=<...> --linode-label=<...> --log-level=debug
+docker-volume-linode --linode-token=<...> --linode-label=<...> --log-level=debug
 ```
 
 ## Development

driver.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"sync"
 
 	"github.com/docker/docker/api/types/filters"
@@ -29,15 +30,21 @@ type linodeVolumeDriver struct {
 	linodeAPIPtr *linodego.Client
 }
 
-// Constructor
-func newLinodeVolumeDriver(region string, linodeLabel string, linodeToken string) linodeVolumeDriver {
+const (
+	fsTagPrefix = "docker-volume-filesystem-"
+)
 
+// Constructor
+func newLinodeVolumeDriver(linodeLabel string, linodeToken string) linodeVolumeDriver {
 	driver := linodeVolumeDriver{
 		linodeToken: linodeToken,
-		region:      region,
 		linodeLabel: linodeLabel,
 		mutex:       &sync.Mutex{},
 	}
+	if _, err := driver.linodeAPI(); err != nil {
+		log.Fatalf("Could not initialize Linode API: %s", err)
+	}
+
 	return driver
 }
 
@@ -50,7 +57,20 @@ func (driver *linodeVolumeDriver) linodeAPI() (*linodego.Client, error) {
 		return driver.linodeAPIPtr, nil
 	}
 
-	tokenSource := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: *linodeTokenParamPtr})
+	driver.linodeAPIPtr = setupLinodeAPI(*linodeTokenParamPtr)
+
+	if driver.instanceID == 0 {
+		if err := driver.determineLinodeID(); err != nil {
+			driver.linodeAPIPtr = nil
+			return nil, err
+		}
+	}
+
+	return driver.linodeAPIPtr, nil
+}
+
+func setupLinodeAPI(token string) *linodego.Client {
+	tokenSource := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: token})
 	oauth2Client := &http.Client{
 		Transport: &oauth2.Transport{
 			Source: tokenSource,
@@ -60,14 +80,15 @@ func (driver *linodeVolumeDriver) linodeAPI() (*linodego.Client, error) {
 	api := linodego.NewClient(oauth2Client)
 	ua := fmt.Sprintf("docker-volume-linode/%s linodego/%s", VERSION, linodego.Version)
 	api.SetUserAgent(ua)
+	return &api
+}
 
-	driver.linodeAPIPtr = &api
-
+func (driver *linodeVolumeDriver) determineLinodeID() error {
 	if driver.linodeLabel == "" {
 		var hostnameErr error
 		driver.linodeLabel, hostnameErr = os.Hostname()
 		if hostnameErr != nil {
-			return nil, fmt.Errorf("Could not determine hostname: %s", hostnameErr)
+			return fmt.Errorf("Could not determine hostname: %s", hostnameErr)
 		}
 	}
 
@@ -76,17 +97,16 @@ func (driver *linodeVolumeDriver) linodeAPI() (*linodego.Client, error) {
 	linodes, lErr := driver.linodeAPIPtr.ListInstances(context.Background(), listOpts)
 
 	if lErr != nil {
-		return nil, fmt.Errorf("Could not determine Linode instance ID from Linode label %s due to error: %s", driver.linodeLabel, lErr)
+		return fmt.Errorf("Could not determine Linode instance ID from Linode label %s due to error: %s", driver.linodeLabel, lErr)
 	} else if len(linodes) != 1 {
-		return nil, fmt.Errorf("Could not determine Linode instance ID from Linode label %s", driver.linodeLabel)
+		return fmt.Errorf("Could not determine Linode instance ID from Linode label %s", driver.linodeLabel)
 	}
 
 	driver.instanceID = linodes[0].ID
 	if driver.region == "" {
 		driver.region = linodes[0].Region
 	}
-
-	return driver.linodeAPIPtr, nil
+	return nil
 }
 
 // Get implementation
@@ -159,6 +179,7 @@ func (driver *linodeVolumeDriver) Create(req *volume.CreateRequest) error {
 	defer driver.mutex.Unlock()
 
 	var size int
+
 	if sizeOpt, ok := req.Options["size"]; ok {
 		s, err := strconv.Atoi(sizeOpt)
 		if err != nil {
@@ -173,6 +194,20 @@ func (driver *linodeVolumeDriver) Create(req *volume.CreateRequest) error {
 		Size:     size,
 	}
 
+	if fsOpt, ok := req.Options["filesystem"]; ok {
+		createOpts.Tags = append(createOpts.Tags, fsTagPrefix+fsOpt)
+	}
+
+	if deleteOpt, ok := req.Options["delete-on-remove"]; ok {
+		b, err := strconv.ParseBool(deleteOpt)
+		if err != nil {
+			return fmt.Errorf("Invalid delete-on-remove argument")
+		}
+		if b {
+			createOpts.Tags = append(createOpts.Tags, "docker-volume-delete-on-remove")
+		}
+	}
+
 	if _, err := api.CreateVolume(context.Background(), createOpts); err != nil {
 		return fmt.Errorf("Create(%s) Failed: %s", req.Name, err)
 	}
@@ -203,10 +238,16 @@ func (driver *linodeVolumeDriver) Remove(req *volume.RemoveRequest) error {
 		return err
 	}
 
-	// Send Delete request
-	if err := api.DeleteVolume(context.Background(), linVol.ID); err != nil {
-		return err
+	// Optionally send Delete request
+	for _, t := range linVol.Tags {
+		if t == "docker-volume-delete-on-remove" {
+			if err := api.DeleteVolume(context.Background(), linVol.ID); err != nil {
+				return err
+			}
+			break
+		}
 	}
+
 	return nil
 }
 
@@ -262,14 +303,21 @@ func (driver *linodeVolumeDriver) Mount(req *volume.MountRequest) (*volume.Mount
 	// else... linode already attached to current host
 
 	// wait for kernel to have block device available
-	if err := waitForDeviceFileExists(linVol.FilesystemPath, 180); err != nil {
+	if err := waitForDeviceFileExists(linVol.FilesystemPath, 300); err != nil {
 		return nil, err
 	}
 
 	// Format block device if no FS found
 	if GetFSType(linVol.FilesystemPath) == "" {
 		log.Infof("Formatting device:%s;", linVol.FilesystemPath)
-		if err := Format(linVol.FilesystemPath); err != nil {
+		filesystem := "ext4"
+		for _, tag := range linVol.Tags {
+			if strings.HasPrefix(tag, fsTagPrefix) {
+				filesystem = tag[len(fsTagPrefix):]
+				break
+			}
+		}
+		if err := Format(linVol.FilesystemPath, filesystem); err != nil {
 			return nil, err
 		}
 	}
@@ -376,7 +424,7 @@ func attachAndWait(api *linodego.Client, volumeID int, linodeID int) error {
 		return fmt.Errorf("Error attaching volume(%d) to linode(%d): %s", volumeID, linodeID, err)
 	}
 
-	if _, err := api.WaitForVolumeLinodeID(context.Background(), volumeID, &linodeID, 180); err != nil {
+	if _, err := api.WaitForVolumeLinodeID(context.Background(), volumeID, &linodeID, 300); err != nil {
 		return fmt.Errorf("Error waiting for attachment of volume(%d) to linode(%d): %s", volumeID, linodeID, err)
 	}
 	return nil

fs_utils_linux.go

@@ -8,13 +8,9 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-const (
-	formatFSType = "ext4"
-)
-
 // Format calls mke2fs on path
-func Format(path string) error {
-	cmd := exec.Command("mke2fs", "-t", formatFSType, path)
+func Format(path string, formatFSType string) error {
+	cmd := exec.Command("mkfs", "-t", formatFSType, path)
 	stdOutAndErr, err := cmd.CombinedOutput()
 	log.Debugf("Mke2fs Output:\n%s", stdOutAndErr)
 	return err

main.go

@@ -28,15 +28,13 @@ var (
 	socketAddressParamPtr = cfgString("socket-file", DefaultSocketAddress, "Sets the socket file/address.")
 	mountRootParamPtr     = cfgString("mount-root", MountRoot, "Sets the root directory for volume mounts.")
 	linodeTokenParamPtr   = cfgString("linode-token", "", "Required Personal Access Token generated in Linode Console.")
-	linodeRegionParamPtr  = cfgString("linode-region", "", "Required linode region.")
-	linodeLabelParamPtr   = cfgString("linode-label", "", "Sets the Linode instance label.")
-	logLevelPtr           = cfgString("log-level", "info", "Sets log level debug,info,warn,error")
+	linodeLabelParamPtr   = cfgString("linode-label", "", "Sets the Linode Instance Label (defaults to the OS HOSTNAME)")
+	logLevelPtr           = cfgString("log-level", "info", "Sets log level: debug,info,warn,error")
 )
 
 func main() {
 	//
 	flag.Parse()
-
 	//
 	log.SetOutput(os.Stdout)
 	level, err := log.ParseLevel(*logLevelPtr)
@@ -49,26 +47,16 @@ func main() {
 
 	// check required parameters (token, region and label)
 	if *linodeTokenParamPtr == "" {
-		log.Error("linode-token is required.")
-	}
-
-	if *linodeRegionParamPtr == "" {
-		log.Error("linode-region is required.")
-	}
-
-	if *linodeLabelParamPtr == "" {
-		log.Error("linode-label is required.")
+		log.Fatal("linode-token is required.")
 	}
 
 	MountRoot = *mountRootParamPtr
 
-	//
 	log.Debugf("linode-token: %s", *linodeTokenParamPtr)
-	log.Debugf("linode-region: %s", *linodeRegionParamPtr)
 	log.Debugf("linode-label: %s", *linodeLabelParamPtr)
 
 	// Driver instance
-	driver := newLinodeVolumeDriver(*linodeRegionParamPtr, *linodeLabelParamPtr, *linodeTokenParamPtr)
+	driver := newLinodeVolumeDriver(*linodeLabelParamPtr, *linodeTokenParamPtr)
 
 	// Attach Driver to docker
 	handler := volume.NewHandler(&driver)