feat: implement cmd management for targets, LUNs, and TPGTs (fixes #36)

- Fix target delete URL path mismatch (/targets/ -> /target/)
- Implement target create/delete server handlers with proper validation
- Add DeleteTarget method with force flag and mutex locking to SCSITargetService
- Implement full LU management: create/list/delete through CLI, client, and server
- Add TPGT list command to show target portal group tags
- Add unit tests for target/LU router handlers and SCSI service

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pkg/api/client/lu_create.go

@@ -0,0 +1,13 @@
+package client
+
+import (
+	"github.com/gostor/gotgt/pkg/api"
+	"golang.org/x/net/context"
+)
+
+// LuCreate creates a LU in the SCSI Target.
+func (cli *Client) LuCreate(ctx context.Context, options api.LuCreateRequest) error {
+	resp, err := cli.post(ctx, "/lu/create", nil, options, nil)
+	ensureReaderClosed(resp)
+	return err
+}

pkg/api/client/lu_delete.go

@@ -0,0 +1,13 @@
+package client
+
+import (
+	"github.com/gostor/gotgt/pkg/api"
+	"golang.org/x/net/context"
+)
+
+// LuRemove removes a LU from a target in the SCSI Target.
+func (cli *Client) LuRemove(ctx context.Context, options api.LuRemoveOptions) error {
+	resp, err := cli.post(ctx, "/lu/delete", nil, options, nil)
+	ensureReaderClosed(resp)
+	return err
+}

pkg/api/client/lu_list.go

@@ -0,0 +1,25 @@
+package client
+
+import (
+	"encoding/json"
+	"net/url"
+
+	"github.com/gostor/gotgt/pkg/api"
+	"golang.org/x/net/context"
+)
+
+// LuList lists LUs for a target in the SCSI Target.
+func (cli *Client) LuList(ctx context.Context, options api.LuListOptions) ([]api.LuInfo, error) {
+	var lus []api.LuInfo
+	query := url.Values{}
+	if options.TargetName != "" {
+		query.Set("target", options.TargetName)
+	}
+	resp, err := cli.get(ctx, "/lu/list", query, nil)
+	if err != nil {
+		return lus, err
+	}
+	err = json.NewDecoder(resp.body).Decode(&lus)
+	ensureReaderClosed(resp)
+	return lus, err
+}

pkg/api/client/target_delete.go

@@ -29,7 +29,7 @@ func (cli *Client) TargetRemove(ctx context.Context, options api.TargetRemoveOpt
 	if options.Force {
 		query.Set("force", "1")
 	}
-	resp, err := cli.delete(ctx, "/targets/"+options.Name, query, nil)
+	resp, err := cli.delete(ctx, "/target/"+options.Name, query, nil)
 	ensureReaderClosed(resp)
 	return err
 }

pkg/api/client/tpgt_list.go

@@ -0,0 +1,25 @@
+package client
+
+import (
+	"encoding/json"
+	"net/url"
+
+	"github.com/gostor/gotgt/pkg/api"
+	"golang.org/x/net/context"
+)
+
+// TpgtList lists TPGTs for a target in the SCSI Target.
+func (cli *Client) TpgtList(ctx context.Context, options api.TpgtListOptions) ([]api.TpgtInfo, error) {
+	var tpgts []api.TpgtInfo
+	query := url.Values{}
+	if options.TargetName != "" {
+		query.Set("target", options.TargetName)
+	}
+	resp, err := cli.get(ctx, "/target/tpgt/list", query, nil)
+	if err != nil {
+		return tpgts, err
+	}
+	err = json.NewDecoder(resp.body).Decode(&tpgts)
+	ensureReaderClosed(resp)
+	return tpgts, err
+}

pkg/api/options.go

@@ -29,3 +29,36 @@ type TargetListOptions struct {
 	Name    string
 	Verbose bool
 }
+
+type LuCreateRequest struct {
+	TargetName string `json:"targetName"`
+	DeviceID   uint64 `json:"deviceID"`
+	LUN        uint64 `json:"lun"`
+	Path       string `json:"path"`
+	BlockShift uint   `json:"blockShift"`
+}
+
+type LuListOptions struct {
+	TargetName string
+}
+
+type LuRemoveOptions struct {
+	TargetName string `json:"targetName"`
+	LUN        uint64 `json:"lun"`
+}
+
+type LuInfo struct {
+	LUN    uint64 `json:"lun"`
+	Path   string `json:"path"`
+	Online bool   `json:"online"`
+	Size   uint64 `json:"size"`
+}
+
+type TpgtListOptions struct {
+	TargetName string
+}
+
+type TpgtInfo struct {
+	TPGT    uint16   `json:"tpgt"`
+	Portals []string `json:"portals"`
+}