Re: [Libguestfs] [PATCH 5/5] v2v: Add -o rhv-upload output mode.

PROBLEMS: - Spools to a temporary disk - Need to specify direct/indirect upload via flag - Location of ca.pem

- Target cluster - Delete disks on failure, or rename disks on success?

- Handling of sparseness in raw format disks This adds a new output mode to virt-v2v. virt-v2v -o rhv-upload streams images directly to an oVirt or RHV >= 4 Data Domain using the oVirt SDK v4. It is more efficient than -o rhv because it does not need to go via the Export Storage Domain, and is possible for humans to use unlike -o vdsm. The implementation uses the Python SDK by running snippets of Python code to interact with the ‘ovirtsdk4’ module. It requires both Python 3 and the Python SDK v4 to be installed at run time (these are not, however, new dependencies of virt-v2v since most people wouldn't have them). --- v2v/Makefile.am | 2 + v2v/cmdline.ml | 25 +++ v2v/output_rhv_upload.ml | 403 ++++++++++++++++++++++++++++++++++++++++++++++ v2v/output_rhv_upload.mli | 26 +++ 4 files changed, 456 insertions(+) diff --git a/v2v/Makefile.am b/v2v/Makefile.am index 83f0c30c7..c028babe6 100644 --- a/v2v/Makefile.am +++ b/v2v/Makefile.am @@ -64,6 +64,7 @@ SOURCES_MLI = \ output_null.mli \ output_qemu.mli \ output_rhv.mli \ + output_rhv_upload.mli \ output_vdsm.mli \ parse_ovf_from_ova.mli \ parse_libvirt_xml.mli \ @@ -116,6 +117,7 @@ SOURCES_ML = \ output_local.ml \ output_qemu.ml \ output_rhv.ml \ + output_rhv_upload.ml \ output_vdsm.ml \ inspect_source.ml \ target_bus_assignment.ml \ diff --git a/v2v/cmdline.ml b/v2v/cmdline.ml index fceda1f82..4424863fe 100644 --- a/v2v/cmdline.ml +++ b/v2v/cmdline.ml @@ -138,6 +138,8 @@ let parse_cmdline () = | "disk" | "local" -> output_mode := `Local | "null" -> output_mode := `Null | "ovirt" | "rhv" | "rhev" -> output_mode := `RHV + | "ovirt-upload" | "ovirt_upload" | "rhv-upload" | "rhv_upload" -> + output_mode := `RHV_Upload | "qemu" -> output_mode := `QEmu | "vdsm" -> output_mode := `VDSM | s -> @@ -537,6 +539,29 @@ read the man page virt-v2v(1). Output_rhv.output_rhv os output_alloc, output_format, output_alloc + | `RHV_Upload -> + let output_conn = + match output_conn with + | None -> + error (f_"-o rhv-upload: output connection was not specified, use ‘-oc’ to point to the oVirt or RHV server REST API URL") + | Some oc -> oc in + (* In theory we could make the password optional in future. *) + let output_password = + match output_password with + | None -> + error (f_"-o rhv-upload: output password file was not specified, use ‘-op’ to point to a file which contains the password used to connect to the oVirt or RHV server") + | Some op -> op in + let os = + match output_storage with + | None -> + error (f_"-o rhv-upload: output storage was not specified, use ‘-os’"); + | Some os -> os in + if qemu_boot then + error_option_cannot_be_used_in_output_mode "rhv-upload" "--qemu-boot"; + Output_rhv_upload.output_rhv_upload output_alloc output_conn + output_password os, + output_format, output_alloc + | `VDSM -> if output_password <> None then error_option_cannot_be_used_in_output_mode "vdsm" "-op"; diff --git a/v2v/output_rhv_upload.ml b/v2v/output_rhv_upload.ml new file mode 100644 index 000000000..77f7bc988 --- /dev/null +++ b/v2v/output_rhv_upload.ml @@ -0,0 +1,403 @@ +(* virt-v2v + * Copyright (C) 2009-2018 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + *) + +open Printf +open Unix + +open Std_utils +open Tools_utils +open Unix_utils +open Common_gettext.Gettext + +open Types +open Utils + +(* These correspond mostly to the fields in the Python + * sdk.Connection object, except for the password which + * is handled separately. + *) +type connection = { + conn_url : string; + conn_username : string; + conn_debug : bool; +} + +let string_of_connection conn = + sprintf "url=%s username=%s debug=%b" + conn.conn_url conn.conn_username conn.conn_debug + +(* Python code fragments go first. Note these must not be + * indented because of Python's stupid whitespace thing. + *) + +(* Print the Python version. *) +let python_get_version = " +import sys +print (sys.version[0]) # syntax works on py2 or py3 +" + +(* Import all the Python modules needed. *) +let python_imports = " +import logging +import ovirtsdk4 as sdk +import ovirtsdk4.types as types +import ssl +import sys +import time + +from http.client import HTTPSConnection + +try: + from urllib.parse import urlparse +except ImportError: + from urlparse import urlparse +" + +(* Create the Python prologue which connects to the system service. + * This returns a string of Python code. + *) +let python_connect tmpdir conn output_password = + sprintf " +password_file = %s +with open(password_file, 'r') as file: + password = file.read() +password = password.rstrip() + +# Open the connection. +connection = sdk.Connection( + url = %s, + username = %s, + password = password, + debug = %s, + log = logging.getLogger(), + insecure = True, +) +system_service = connection.system_service() +" (py_quote output_password) + (py_quote conn.conn_url) + (py_quote conn.conn_username) + (py_bool conn.conn_debug) + +let python_create_one_disk disk_name disk_format + output_alloc output_storage disk_size = + sprintf " +disks_service = system_service.disks_service() +disk = disks_service.add( + disk = types.Disk( + name = %s, + format = %s, + sparse = %s, + provisioned_size = %Ld, + storage_domains = [types.StorageDomain(name = %s)], + ) +) +disk_id = disk.id + +# Wait til the disk is up. The transfer cannot start if the +# disk is locked. +disk_service = disks_service.disk_service(disk_id) +while True: + time.sleep(5) + disk = disk_service.get() + if disk.status == types.DiskStatus.OK: + break + +# Return the disk ID. +print(disk_id) +" (py_quote disk_name) + disk_format (* it's a raw Python expression, don't quote *) + (py_bool (output_alloc = Sparse)) + disk_size + (py_quote output_storage) + +(* XXX Temporary function. *) +let python_upload_one_disk disk_id disk_size filename = + sprintf " +transfers_service = system_service.image_transfers_service() + +transfer = transfers_service.add( + types.ImageTransfer( + image = types.Image (id=%s) + ) +) + +transfer_service = transfers_service.image_transfer_service(transfer.id) + +# After adding a new transfer for the disk, the transfer's status will +# be INITIALIZING. Wait until the init phase is over. +while transfer.phase == types.ImageTransferPhase.INITIALIZING: + time.sleep(1) + transfer = transfer_service.get() + +if %s: + if transfer.transfer_url is None: + print(\"Direct upload to host not supported, requires ovirt-engine >= 4.2\") + sys.exit(1) + destination_url = urlparse(transfer.transfer_url) +else: + destination_url = urlparse(transfer.proxy_url) + +context = ssl.create_default_context() +context.load_verify_locations(cafile = %s) + +proxy_connection = HTTPSConnection( + destination_url.hostname, + destination_url.port, + context = context +) + +image_path = %s +image_size = %Ld + +proxy_connection.putrequest(\"PUT\", destination_url.path) +proxy_connection.putheader('Content-Length', image_size) +proxy_connection.endheaders() + +# This seems to give the best throughput when uploading from Yaniv's +# machine to a server that drops the data. You may need to tune this +# on your setup. +BUF_SIZE = 128 * 1024 + +with open(image_path, \"rb\") as disk: + pos = 0 + while pos < image_size: + # Send the next chunk to the proxy. + to_read = min(image_size - pos, BUF_SIZE) + chunk = disk.read(to_read) + if not chunk: + transfer_service.pause() + raise RuntimeError(\"Unexpected end of file at pos=%%d\" %% pos) + + proxy_connection.send(chunk) + pos += len(chunk) + +# Get the response +response = proxy_connection.getresponse() +if response.status != 200: + transfer_service.pause() + print(\"Upload failed: %%s %%s\" %% + (response.status, response.reason)) + sys.exit(1) + +# Successful cleanup +transfer_service.finalize() +connection.close() +proxy_connection.close() +" (py_quote disk_id) + (py_bool true(*direct_upload XXX*)) + (py_quote "/tmp/ca.pem"(*cafile XXX*)) + (py_quote filename) + disk_size + +let python_create_virtual_machine ovf = + sprintf " +vms_service = system_service.vms_service() +vm = vms_service.add( + types.Vm( + cluster=types.Cluster(name = %s), + initialization=types.Initialization( + configuration = types.Configuration( + type = types.ConfigurationType.OVA, + data = %s + ) + ) + ) +) +" (py_quote "Default" (* XXX target cluster *)) + (py_quote (DOM.doc_to_string ovf)) + +(* Find the Python 3 binary. *) +let find_python3 () = + let rec loop = function + | [] -> + error "could not locate Python 3 binary on the $PATH. You may have to install Python 3. If Python 3 is already installed then you may need to create a directory containing a binary called ‘python3’ which runs Python 3." + | python :: rest -> + (* Use shell_command first to check the binary exists. *) + let cmd = sprintf "%s --help >/dev/null 2>&1" (quote python) in + if shell_command cmd = 0 && + run_python ~python python_get_version = ["3"] then ( + debug "rhv-upload: python binary: %s" python; + python + ) + else + loop rest + in + loop ["python3"; "python"] + +(* Parse the -oc URI. *) +let parse_output_conn oc = + let uri = Xml.parse_uri oc in + if uri.Xml.uri_scheme <> Some "https" then + error (f_"rhv-upload: -oc: URI must start with https://..."); + if uri.Xml.uri_server = None then + error (f_"rhv-upload: -oc: no remote server name in the URI"); + if uri.Xml.uri_path = None || uri.Xml.uri_path = Some "/" then + error (f_"rhv-upload: -oc: URI path component looks incorrect"); + let username = + match uri.Xml.uri_user with + | None -> + warning (f_"rhv-upload: -oc: username was missing from URI, assuming ‘admin@internal’"); + "admin@internal" + | Some user -> user in

+ (* Reconstruct the URI without the username. *) + let url = sprintf "%s://%s%s" + (Option.default "https" uri.Xml.uri_scheme) + (Option.default "localhost" uri.Xml.uri_server) + (Option.default "" uri.Xml.uri_path) in + + let conn = { conn_url = url; conn_username = username; + conn_debug = verbose () } in + debug "rhv-upload: connection=%s" (string_of_connection conn); + conn + +(* Create a single, empty disk on the target. *) +let create_one_disk run_python tmpdir conn + output_password output_format + output_alloc output_storage + source target = + (* Give the disk a predictable name based on the source + * name and disk index. + *) + let disk_name = + let id = target.target_overlay.ov_source.s_disk_id in + sprintf "%s-%03d" source.s_name id in + + let disk_format = + match output_format with + | `Raw -> "types.DiskFormat.RAW" + | `COW -> "types.DiskFormat.COW" in + + (* This is the virtual size in bytes. *) + let disk_size = target.target_overlay.ov_virtual_size in + + let code = + python_imports ^ + python_connect tmpdir conn output_password ^ + python_create_one_disk disk_name disk_format + output_alloc output_storage disk_size in + match run_python code with + | [id] -> id + | _ -> error (f_"rhv-upload: create_one_disk: error creating disks, see previous output") + +(* XXX Temporary function to upload spooled disk. *) +let upload_one_disk run_python tmpdir conn output_password t filename disk_id = + let disk_size = t.target_overlay.ov_virtual_size in + + let code = + python_imports ^ + python_connect tmpdir conn output_password ^ + python_upload_one_disk disk_id disk_size filename in + ignore (run_python code) + +(* Upload the virtual machine metadata (ie OVF) and create a VM. *) +let create_virtual_machine run_python tmpdir conn output_password ovf = + let code = + python_imports ^ + python_connect tmpdir conn output_password ^ + python_create_virtual_machine ovf in + ignore (run_python code) + +class output_rhv_upload output_alloc output_conn + output_password output_storage = + let run_python = + let python = find_python3 () in + run_python ~python in + let conn = parse_output_conn output_conn in + + (* The temporary directory is used for a few things such as passing + * passwords securely and (temporarily) for spooling disks (XXX). + *) + let tmpdir = + let base_dir = (open_guestfs ())#get_cachedir () in + let t = Mkdtemp.temp_dir ~base_dir "rhvupload." in + rmdir_on_exit t; + t in +object + inherit output + + method precheck () = + (* Check all the dependencies including the Python 3 oVirt SDK v4 + * module are installed. This will fail with a Python error message. + *) + ignore (run_python python_imports) + + method as_options = + "-o rhv-upload" ^ + (match output_alloc with + | Sparse -> "" (* default, don't need to print it *) + | Preallocated -> " -oa preallocated") ^ + sprintf " -oc %s -op %s -os %s" + output_conn output_password output_storage + + method supported_firmware = [ TargetBIOS ] + + (* List of disks we have created. There will be one per target. *) + val mutable target_disk_ids = [] + + method prepare_targets source targets = + let targets = + List.map ( + fun t -> + (* Only allow output format "raw" or "qcow2". *) + let output_format = + match t.target_format with + | "raw" -> `Raw + | "qcow2" -> `COW + | _ -> + error (f_"rhv-upload: -of %s: Only output format ‘raw’ or ‘qcow2’ is supported. If the input is in a different format then force one of these output formats by adding either ‘-of raw’ or ‘-of qcow’ on the command line.") + t.target_format in + + let disk_id = create_one_disk run_python tmpdir conn output_password + output_format output_alloc + output_storage source t in + + (* XXX Temporarily spool disks to tmpdir. *) + let target_file = TargetFile (tmpdir // t.target_overlay.ov_sd) in + { t with target_file }, disk_id + ) targets in + target_disk_ids <- List.map snd targets; + List.map fst targets + + method create_metadata source targets _ guestcaps inspect target_firmware = + (* Upload the spooled disks. *) + List.iter ( + fun (t, disk_id) -> + let filename = + match t.target_file with + | TargetFile filename -> filename + | TargetURI _ -> assert false in + upload_one_disk run_python tmpdir conn output_password + t filename disk_id + ) (List.combine targets target_disk_ids); + + (* Create the metadata. *) + let ovf = + Create_ovf.create_ovf source targets guestcaps inspect + Sparse + "domain" + (List.map (fun t -> "") targets) + target_disk_ids + "vm" in + + (* Add the virtual machine. *) + create_virtual_machine run_python tmpdir conn output_password ovf + +end + +let output_rhv_upload = new output_rhv_upload +let () = Modules_list.register_output_module "rhv-upload" diff --git a/v2v/output_rhv_upload.mli b/v2v/output_rhv_upload.mli new file mode 100644 index 000000000..54999b727 --- /dev/null +++ b/v2v/output_rhv_upload.mli @@ -0,0 +1,26 @@ +(* virt-v2v + * Copyright (C) 2009-2018 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + *) + +(** [-o rhv-upload] target. *) + +val output_rhv_upload : Types.output_allocation -> string -> string -> + string -> + Types.output +(** [output_rhv_upload output_alloc output_conn output_password output_storage] + creates and returns a new {!Types.output} object specialized for writing + output to oVirt or RHV directly via RHV APIs. *) -- 2.13.2