[Libguestfs] [v2v PATCH v2 6/7] convert/libosinfo_utils: extract "best_driver" from "windows_virtio.ml"

The "copy_from_libosinfo" function in "windows_virtio.ml" filters and sorts the driver list from libosinfo in order to find the best driver. Move this logic to a separate function (called "best_driver") in the Libosinfo_utils module. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2043333 Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; Acked-by: Richard W.M. Jones <rjones(a)redhat.com&gt; --- Notes: v2: - pick up Rich's ACK convert/libosinfo_utils.mli | 12 ++++++++++ convert/libosinfo_utils.ml | 35 +++++++++++++++++++++++++++++ convert/windows_virtio.ml | 44 +------------------------------------ 3 files changed, 48 insertions(+), 43 deletions(-) diff --git a/convert/libosinfo_utils.mli b/convert/libosinfo_utils.mli index 67be16c491a4..14991bc2d782 100644 --- a/convert/libosinfo_utils.mli +++ b/convert/libosinfo_utils.mli @@ -28,12 +28,24 @@ val get_os_by_short_id : string -> Libosinfo.osinfo_os val string_of_osinfo_device_list : Libosinfo.osinfo_device list -> string (** Convert an [osinfo_device] list to a printable string for debugging. *) val string_of_osinfo_device_driver : Libosinfo.osinfo_device_driver -> string (** Convert a [osinfo_device_driver] to a printable string for debugging. *) +val best_driver : Libosinfo.osinfo_device_driver list -> + string -> + Libosinfo.osinfo_device_driver +(** [best_driver drivers arch] picks the best driver from [drivers] as follows: + - filters out drivers that: + - target a different architecture, + - are not pre-installable, + - have an invalid or non-local URL; + - sorts the remaining drivers by priority, like libosinfo does; + - picks the top driver of the sorted list. + Raises Not_found if no driver in [drivers] survives filtering. *) + type os_support = { q35 : bool; vio10 : bool; } (** Tell whether the operating system supports the Q35 board type and/or non-transitional (virtio-1.0-only) virtio devices. (Internally, the diff --git a/convert/libosinfo_utils.ml b/convert/libosinfo_utils.ml index f0d70ffd4997..8504e2b2f001 100644 --- a/convert/libosinfo_utils.ml +++ b/convert/libosinfo_utils.ml @@ -76,12 +76,47 @@ let string_of_osinfo_device_driver { Libosinfo.architecture; location; (if pre_installable then "pre-installable" else "not pre-installable") (if signed then "signed" else "unsigned") priority (String.concat "\n" files) (string_of_osinfo_device_list devices) +let best_driver drivers arch = + let debug_drivers = + List.iter (fun d -> debug "Driver: %s" (string_of_osinfo_device_driver d)) + (* The architecture that "inspect.i_arch" from libguestfs + * ("daemon/filearch.ml") calls "i386", the osinfo-db schema + * ("data/schema/osinfo.rng.in") calls "i686". + *) + and arch = if arch = "i386" then "i686" else arch in + debug "libosinfo drivers before filtering:"; + debug_drivers drivers; + let drivers = + List.filter ( + fun { Libosinfo.architecture; location; pre_installable } -> + if architecture <> arch || not pre_installable then + false + else + try + (match Xml.parse_uri location with + | { Xml.uri_scheme = Some scheme; + Xml.uri_path = Some _ } when scheme = "file" -> true + | _ -> false + ) + with Invalid_argument _ -> false + ) drivers in + debug "libosinfo drivers after filtering:"; + debug_drivers drivers; + let drivers = + List.sort ( + fun { Libosinfo.priority = prioA } { Libosinfo.priority = prioB } -> + compare prioB prioA + ) drivers in + if drivers = [] then + raise Not_found; + List.hd drivers + type os_support = { q35 : bool; vio10 : bool; } let os_support_of_osinfo_device_list = diff --git a/convert/windows_virtio.ml b/convert/windows_virtio.ml index 610a56857c7e..5254322c7d28 100644 --- a/convert/windows_virtio.ml +++ b/convert/windows_virtio.ml @@ -405,59 +405,17 @@ and virtio_iso_path_matches_qemu_ga path inspect = * * Files that do not exist are silently skipped. * * Returns list of copied files. *) and copy_from_libosinfo g inspect destdir = - let debug_drivers = - List.iter ( - fun d -> - debug "Driver: %s" (Libosinfo_utils.string_of_osinfo_device_driver d) - ) - in let { i_osinfo = osinfo; i_arch = arch } = inspect in - (* The architecture that "inspect.i_arch" from libguestfs - * ("daemon/filearch.ml") calls "i386", the osinfo-db schema - * ("data/schema/osinfo.rng.in") calls "i686". - *) - let arch = if arch = "i386" then "i686" else arch in try let os = Libosinfo_utils.get_os_by_short_id osinfo in let drivers = os#get_device_drivers () in - debug "libosinfo drivers before filtering:"; debug_drivers drivers; - (* - * Filter out drivers that we cannot use: - * - for a different architecture - * - non-pre-installable ones - * - location is an invalid URL, or a non-local one - *) - let drivers = - List.filter ( - fun { Libosinfo.architecture; location; pre_installable } -> - if architecture <> arch || not pre_installable then - false - else - try - (match Xml.parse_uri location with - | { Xml.uri_scheme = Some scheme; - Xml.uri_path = Some _ } when scheme = "file" -> true - | _ -> false - ) - with Invalid_argument _ -> false - ) drivers in - debug "libosinfo drivers after filtering:"; debug_drivers drivers; - (* Sort the drivers by priority, like libosinfo does. *) - let drivers = - List.sort ( - fun { Libosinfo.priority = prioA } { Libosinfo.priority = prioB } -> - compare prioB prioA - ) drivers in - (* Any driver available? *) - if drivers = [] then - raise Not_found; - let driver = List.hd drivers in + let driver = Libosinfo_utils.best_driver drivers arch in let uri = Xml.parse_uri driver.Libosinfo.location in let basedir = match uri.Xml.uri_path with | Some p -> p | None -> assert false in List.filter_map ( -- 2.19.1.3.g30247aa5d201