feat: basic volume plugin commands

.gitignore

@@ -30,3 +30,4 @@ go.work.sum
 # Editor/IDE
 # .idea/
 # .vscode/
+ironmount

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.24-alpine3.21 AS builder
+
+WORKDIR /ironmount
+
+COPY go.mod ./
+
+RUN go mod download
+
+COPY . .
+
+ARG TARGETOS=linux
+ARG TARGETARCH
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH \
+  go build -o /out/ironmount .
+
+FROM alpine:3.22 AS runner
+WORKDIR /
+COPY --from=builder /out/ironmount /ironmount
+
+ENTRYPOINT ["/ironmount"]

docker-compose.yml

@@ -0,0 +1,12 @@
+version: "3.8"
+
+services:
+  ironmount:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: ironmount
+    restart: unless-stopped
+    volumes:
+      - /run/docker/plugins:/run/docker/plugins
+      - /tmp/ironmount:/tmp/ironmount

internal/constants/constants.go

@@ -0,0 +1,3 @@
+package constants
+
+var VolumeRoot = "/tmp/ironmount"

internal/driver/activate.go

@@ -0,0 +1,17 @@
+package driver
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+)
+
+func Activate(w http.ResponseWriter, r *http.Request) {
+	// Log the activation request
+	log.Printf("Received activation request: %s", r.URL.Path)
+
+	resp := map[string]any{
+		"Implements": []string{"VolumeDriver"},
+	}
+	_ = json.NewEncoder(w).Encode(resp)
+}

internal/driver/create.go

@@ -0,0 +1,25 @@
+package driver
+
+import (
+	"encoding/json"
+	"ironmount/internal/constants"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func Create(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		Name string
+	}
+	_ = json.NewDecoder(r.Body).Decode(&req)
+
+	volPath := filepath.Join(constants.VolumeRoot, req.Name)
+	if err := os.MkdirAll(volPath, 0755); err != nil {
+		_ = json.NewEncoder(w).Encode(map[string]string{"Err": err.Error()})
+		return
+	}
+
+	volumes[req.Name] = Volume{Name: req.Name, Path: volPath}
+	_ = json.NewEncoder(w).Encode(map[string]string{"Err": ""})
+}

internal/driver/mount.go

@@ -0,0 +1,27 @@
+package driver
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func Mount(w http.ResponseWriter, r *http.Request) {
+	var req MountRequest
+	err := json.NewDecoder(r.Body).Decode(&req)
+
+	if err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	vol, ok := volumes[req.Name]
+	if !ok {
+		_ = json.NewEncoder(w).Encode(map[string]string{"Err": "volume not found"})
+		return
+	}
+
+	_ = json.NewEncoder(w).Encode(map[string]string{
+		"Mountpoint": vol.Path,
+		"Err":        "",
+	})
+}

internal/driver/path.go

@@ -0,0 +1,22 @@
+package driver
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func Path(w http.ResponseWriter, r *http.Request) {
+	var req PathRequest
+	_ = json.NewDecoder(r.Body).Decode(&req)
+
+	vol, ok := volumes[req.Name]
+	if !ok {
+		_ = json.NewEncoder(w).Encode(map[string]string{"Err": "volume not found"})
+		return
+	}
+
+	_ = json.NewEncoder(w).Encode(map[string]string{
+		"Mountpoint": vol.Path,
+		"Err":        "",
+	})
+}

internal/driver/remove.go

@@ -0,0 +1,14 @@
+package driver
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func Remove(w http.ResponseWriter, r *http.Request) {
+	var req RemoveRequest
+	_ = json.NewDecoder(r.Body).Decode(&req)
+
+	delete(volumes, req.Name)
+	_ = json.NewEncoder(w).Encode(map[string]string{"Err": ""})
+}

internal/driver/state.go

@@ -0,0 +1,8 @@
+package driver
+
+type Volume struct {
+	Name string
+	Path string
+}
+
+var volumes = map[string]Volume{}

internal/driver/type.go

@@ -0,0 +1,22 @@
+package driver
+
+// CreateRequest is the JSON request for Create
+type CreateRequest struct {
+	Name string
+}
+
+// RemoveRequest is the JSON request for Remove
+type RemoveRequest struct {
+	Name string
+}
+
+// MountRequest is the JSON request for Mount
+type MountRequest struct {
+	Name string
+	ID   string
+}
+
+// PathRequest is the JSON request for Path
+type PathRequest struct {
+	Name string
+}

internal/driver/unmount.go

@@ -0,0 +1,10 @@
+package driver
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func Unmount(w http.ResponseWriter, r *http.Request) {
+	_ = json.NewEncoder(w).Encode(map[string]string{"Err": ""})
+}

main.go

@@ -1,20 +1,52 @@
 package main
 
 import (
-	"fmt"
+	"ironmount/internal/driver"
+	"log"
+	"net"
 	"net/http"
+	"os"
 )
 
-func handler(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintln(w, "Hello, World!")
+const volumeRoot = "/tmp/ironmount"
+
+type Volume struct {
+	Name string
+	Path string
 }
 
+var volumes = map[string]Volume{}
+
 func main() {
-	http.HandleFunc("/", handler)
-
-	fmt.Println("Server is running on http://localhost:8080")
-	err := http.ListenAndServe(":8080", nil)
-	if err != nil {
-		fmt.Println("Error starting server:", err)
+	if err := os.MkdirAll("/run/docker/plugins", 0755); err != nil {
+		log.Fatalf("Failed to create plugin directory: %v", err)
 	}
+
+	if err := os.MkdirAll(volumeRoot, 0755); err != nil {
+		log.Fatalf("Failed to create volume root: %v", err)
+	}
+
+	if err := os.MkdirAll("/run/docker/plugins", 0755); err != nil {
+		log.Fatalf("Failed to create plugin directory: %v", err)
+	}
+
+	socketPath := "/run/docker/plugins/ironmount.sock"
+	if err := os.RemoveAll(socketPath); err != nil {
+		log.Fatalf("Failed to remove existing socket: %v", err)
+	}
+
+	http.HandleFunc("/Plugin.Activate", driver.Activate)
+	http.HandleFunc("/VolumeDriver.Create", driver.Create)
+	http.HandleFunc("/VolumeDriver.Remove", driver.Remove)
+	http.HandleFunc("/VolumeDriver.Mount", driver.Mount)
+	http.HandleFunc("/VolumeDriver.Unmount", driver.Unmount)
+	http.HandleFunc("/VolumeDriver.Path", driver.Path)
+
+	listener, err := net.Listen("unix", socketPath)
+	if err != nil {
+		log.Fatalf("Failed to listen on socket: %v", err)
+	}
+
+	log.Printf("Irounmount plugin started, listening on %s", socketPath)
+	log.Fatal(http.Serve(listener, nil))
 }