Support to create empty disk images on the controller

gns3server/api/routes/controller/images.py

@@ -23,13 +23,15 @@ import logging
 import urllib.parse
 
 from fastapi import APIRouter, Request, Depends, status
+from fastapi.encoders import jsonable_encoder
 from starlette.requests import ClientDisconnect
 from sqlalchemy.orm.exc import MultipleResultsFound
 from typing import List, Optional
 from gns3server import schemas
 
 from gns3server.config import Config
-from gns3server.utils.images import InvalidImageError, write_image
+from gns3server.compute.qemu import Qemu
+from gns3server.utils.images import InvalidImageError, write_image, read_image_info, default_images_directory
 from gns3server.db.repositories.images import ImagesRepository
 from gns3server.db.repositories.templates import TemplatesRepository
 from gns3server.db.repositories.rbac import RbacRepository
@@ -50,6 +52,53 @@ log = logging.getLogger(__name__)
 router = APIRouter()
 
 
+@router.post(
+    "/{image_path:path}",
+    response_model=schemas.Image,
+    status_code=status.HTTP_201_CREATED,
+    dependencies=[Depends(has_privilege("Image.Allocate"))]
+)
+async def create_image(
+        image_path: str,
+        image_data: schemas.QemuDiskImageCreate,
+        images_repo: ImagesRepository = Depends(get_repository(ImagesRepository)),
+
+) -> schemas.Image:
+    """
+    Create a new blank image.
+
+    Required privilege: Image.Allocate
+    """
+
+    allow_raw_image = Config.instance().settings.Server.allow_raw_images
+    if image_data.format == schemas.QemuDiskImageFormat.raw and not allow_raw_image:
+        raise ControllerBadRequestError("Raw images are not allowed")
+
+    disk_image_path = urllib.parse.unquote(image_path)
+    image_dir, image_name = os.path.split(disk_image_path)
+    # check if the path is within the default images directory
+    base_images_directory = os.path.expanduser(Config.instance().settings.Server.images_path)
+    full_path = os.path.abspath(os.path.join(base_images_directory, image_dir, image_name))
+    if os.path.commonprefix([base_images_directory, full_path]) != base_images_directory:
+        raise ControllerForbiddenError(f"Cannot write disk image, '{disk_image_path}' is forbidden")
+
+    if not image_dir:
+        # put the image in the default images directory
+        directory = default_images_directory(image_type="qemu")
+        os.makedirs(directory, exist_ok=True)
+        disk_image_path = os.path.abspath(os.path.join(directory, disk_image_path))
+
+    if await images_repo.get_image(disk_image_path):
+        raise ControllerBadRequestError(f"Disk image '{disk_image_path}' already exists")
+
+    options = jsonable_encoder(image_data, exclude_unset=True)
+    # FIXME: should we have the create_disk_image in the compute code since
+    # this code is used to create images on the controller?
+    await Qemu.instance().create_disk_image(disk_image_path, options)
+
+    image_info = await read_image_info(disk_image_path, "qemu")
+    return await images_repo.add_image(**image_info)
+
 @router.get(
     "",
     response_model=List[schemas.Image],

gns3server/compute/qemu/__init__.py

@@ -21,6 +21,8 @@ Qemu server module.
 import asyncio
 import os
 import platform
+import shutil
+import shlex
 import sys
 import re
 import subprocess
@@ -159,6 +161,44 @@ class Qemu(BaseManager):
 
         return qemus
 
+    @staticmethod
+    async def create_disk_image(disk_image_path, options):
+        """
+        Create a Qemu disk (used by the controller to create empty disk images)
+
+        :param disk_image_path: disk image path
+        :param options: disk creation options
+        """
+
+        qemu_img_path = shutil.which("qemu-img")
+        if not qemu_img_path:
+            raise QemuError(f"Could not find qemu-img binary")
+
+        try:
+            if os.path.exists(disk_image_path):
+                raise QemuError(f"Could not create disk image '{disk_image_path}', file already exists")
+        except UnicodeEncodeError:
+            raise QemuError(
+                f"Could not create disk image '{disk_image_path}', "
+                "Disk image name contains characters not supported by the filesystem"
+            )
+
+        img_format = options.pop("format")
+        img_size = options.pop("size")
+        command = [qemu_img_path, "create", "-f", img_format]
+        for option in sorted(options.keys()):
+            command.extend(["-o", f"{option}={options[option]}"])
+        command.append(disk_image_path)
+        command.append(f"{img_size}M")
+        command_string = " ".join(shlex.quote(s) for s in command)
+        output = ""
+        try:
+            log.info(f"Executing qemu-img with: {command_string}")
+            output = await subprocess_check_output(*command, stderr=True)
+            log.info(f"Qemu disk image'{disk_image_path}' created")
+        except (OSError, subprocess.SubprocessError) as e:
+            raise QemuError(f"Could not create '{disk_image_path}' disk image: {e}\n{output}")
+
     @staticmethod
     async def get_qemu_version(qemu_path):
         """
@@ -178,25 +218,6 @@ class Qemu(BaseManager):
         except (OSError, subprocess.SubprocessError) as e:
             raise QemuError(f"Error while looking for the Qemu version: {e}")
 
-    @staticmethod
-    async def _get_qemu_img_version(qemu_img_path):
-        """
-        Gets the Qemu-img version.
-
-        :param qemu_img_path: path to Qemu-img executable.
-        """
-
-        try:
-            output = await subprocess_check_output(qemu_img_path, "--version")
-            match = re.search(r"version\s+([0-9a-z\-\.]+)", output)
-            if match:
-                version = match.group(1)
-                return version
-            else:
-                raise QemuError("Could not determine the Qemu-img version for '{}'".format(qemu_img_path))
-        except (OSError, subprocess.SubprocessError) as e:
-            raise QemuError("Error while looking for the Qemu-img version: {}".format(e))
-
     @staticmethod
     async def get_swtpm_version(swtpm_path):
         """

gns3server/schemas/__init__.py

@@ -82,4 +82,4 @@ from .compute.vmware_nodes import VMwareCreate, VMwareUpdate, VMware
 from .compute.virtualbox_nodes import VirtualBoxCreate, VirtualBoxUpdate, VirtualBox
 
 # Schemas for both controller and compute
-from .qemu_disk_image import QemuDiskImageCreate, QemuDiskImageUpdate
+from .qemu_disk_image import QemuDiskImageFormat, QemuDiskImageCreate, QemuDiskImageUpdate