virt-v2v/0018-qemu-nbd-Implement-output-compression-for-qcow2-file.patch
Laszlo Ersek ef5fbb5721 input-xen: cover RHEL9 OpenSSL crypto settings
- Backport upstream ddab06d5eb99 [master] / 9e1c78a4dda8 [rhel-9.1].

- copy-patches.sh: rewrap patch formatting command, spell out "--patience"
  (already expected), then decrease churn by passing "--no-signature".

- Migrate earlier rhbz#2062360 %changelog entries to latest (=new) entry.

resolves: rhbz#2062360
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
2022-07-29 15:27:37 +02:00

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From 80831868395d161af8c47edf2f54234c63581d8d Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Fri, 28 Jan 2022 09:30:29 +0000
Subject: [PATCH] qemu-nbd: Implement output compression for qcow2 files
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 71c4301909cb307def02ebcd0e89beee4138e7f2)
---
lib/qemuNBD.ml | 11 +++++++++--
lib/qemuNBD.mli | 5 +++++
output/output.ml | 39 ++++++++++++++++++++++++++++++++++++---
output/output.mli | 1 +
4 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/lib/qemuNBD.ml b/lib/qemuNBD.ml
index ae21b17c..bbb65f41 100644
--- a/lib/qemuNBD.ml
+++ b/lib/qemuNBD.ml
@@ -55,14 +55,16 @@ type cmd = {
disk : string;
mutable snapshot : bool;
mutable format : string option;
+ mutable imgopts : bool;
}
-let create disk = { disk; snapshot = false; format = None }
+let create disk = { disk; snapshot = false; format = None; imgopts = false }
let set_snapshot cmd snap = cmd.snapshot <- snap
let set_format cmd format = cmd.format <- format
+let set_image_opts cmd imgopts = cmd.imgopts <- imgopts
-let run_unix socket { disk; snapshot; format } =
+let run_unix socket { disk; snapshot; format; imgopts } =
assert (disk <> "");
(* Create a temporary directory where we place the PID file. *)
@@ -85,6 +87,11 @@ let run_unix socket { disk; snapshot; format } =
(* -s adds a protective overlay. *)
if snapshot then List.push_back args "-s";
+ (* --image-opts reinterprets the filename parameter as a set of
+ * image options.
+ *)
+ if imgopts then List.push_back args "--image-opts";
+
if have_selinux && qemu_nbd_has_selinux_label_option () then (
List.push_back args "--selinux-label";
List.push_back args "system_u:object_r:svirt_socket_t:s0"
diff --git a/lib/qemuNBD.mli b/lib/qemuNBD.mli
index e10d3106..afe9d944 100644
--- a/lib/qemuNBD.mli
+++ b/lib/qemuNBD.mli
@@ -43,6 +43,11 @@ val set_snapshot : cmd -> bool -> unit
val set_format : cmd -> string option -> unit
(** Set the format [--format] parameter. *)
+val set_image_opts : cmd -> bool -> unit
+(** Set whether the [--image-opts] parameter is used. This changes
+ the meaning of the [filename] parameter to a set of image options.
+ Consult the qemu-nbd man page for more details. *)
+
val run_unix : string -> cmd -> string * int
(** Start qemu-nbd command listening on a Unix domain socket,
waiting for the process to start up.
diff --git a/output/output.ml b/output/output.ml
index 5c6670b9..23c3932d 100644
--- a/output/output.ml
+++ b/output/output.ml
@@ -69,7 +69,7 @@ let error_if_disk_count_gt dir n =
if Sys.file_exists socket then
error (f_"this output module doesn't support copying more than %d disks") n
-let output_to_local_file ?(changeuid = fun f -> f ())
+let output_to_local_file ?(changeuid = fun f -> f ()) ?(compressed = false)
output_alloc output_format filename size socket =
(* Check nbdkit is installed and has the required plugin. *)
if not (Nbdkit.is_installed ()) then
@@ -78,6 +78,24 @@ let output_to_local_file ?(changeuid = fun f -> f ())
error (f_"nbdkit-file-plugin is not installed or not working");
let nbdkit_config = Nbdkit.config () in
+ if compressed then (
+ (* Only allow compressed with -of qcow2. *)
+ if output_format <> "qcow2" then
+ error (f_"-oo compressed is only allowed when the output format \
+ is a local qcow2-format file, i.e. -of qcow2");
+
+ (* Check nbdcopy is new enough. This assumes that the version of
+ * libnbd is the same as the version of nbdcopy, but parsing this
+ * is easier. We can remove this check when we build-depend on
+ * libnbd >= 1.14.
+ *)
+ let version =
+ NBD.create () |> NBD.get_version |>
+ String.nsplit "." |> List.map int_of_string in
+ if version < [1; 13; 5] then
+ error (f_"-oo compressed option requires nbdcopy >= 1.13.5")
+ );
+
let g = open_guestfs () in
let preallocation =
match output_alloc with
@@ -103,9 +121,24 @@ let output_to_local_file ?(changeuid = fun f -> f ())
On_exit.kill pid
| "qcow2" ->
- let cmd = QemuNBD.create filename in
+ let cmd =
+ if compressed then (
+ let qemu_quote str = String.replace str "," ",," in
+ let image_opts = [ "driver=compress";
+ "file.driver=qcow2";
+ "file.file.driver=file";
+ "file.file.filename=" ^ qemu_quote filename ] in
+ let image_opts = String.concat "," image_opts in
+ let cmd = QemuNBD.create image_opts in
+ QemuNBD.set_image_opts cmd true;
+ cmd
+ )
+ else (* not compressed *) (
+ let cmd = QemuNBD.create filename in
+ QemuNBD.set_format cmd (Some "qcow2");
+ cmd
+ ) in
QemuNBD.set_snapshot cmd false;
- QemuNBD.set_format cmd (Some "qcow2");
let _, pid = QemuNBD.run_unix socket cmd in
On_exit.kill pid
diff --git a/output/output.mli b/output/output.mli
index 8d3d6865..c1f0f53d 100644
--- a/output/output.mli
+++ b/output/output.mli
@@ -84,6 +84,7 @@ val error_if_disk_count_gt : string -> int -> unit
called. *)
val output_to_local_file : ?changeuid:((unit -> unit) -> unit) ->
+ ?compressed:bool ->
Types.output_allocation ->
string -> string -> int64 -> string ->
unit