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(* virt-builder
* Copyright (C) 2015 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 Common_gettext.Gettext
open Common_utils
open Yajl
open Utils
open Printf
let ensure_trailing_slash str =
if String.length str > 0 && str.[String.length str - 1] <> '/' then str ^ "/"
else str
let object_find_optional key = function
| Yajl_object o ->
(match List.filter (fun (k, _) -> k = key) (Array.to_list o) with
| [(k, v)] -> Some v
| [] -> None
| _ -> error (f_"more than value for the key '%s'") key)
| _ -> error (f_"the value of the key '%s' is not an object") key
let object_find key yv =
match object_find_optional key yv with
| None -> error (f_"missing value for the key '%s'") key
| Some v -> v
let object_get_string key yv =
match object_find key yv with
| Yajl_string s -> s
| _ -> error (f_"the value for the key '%s' is not a string") key
let object_find_object key yv =
match object_find key yv with
| Yajl_object _ as o -> o
| _ -> error (f_"the value for the key '%s' is not an object") key
let object_find_objects fn = function
| Yajl_object o -> filter_map fn (Array.to_list o)
| _ -> error (f_"the value is not an object")
let object_get_object key yv =
match object_find_object key yv with
| Yajl_object o -> o
| _ -> assert false (* object_find_object already errors out. *)
let object_get_number key yv =
match object_find key yv with
| Yajl_number n -> n
| Yajl_double d -> Int64.of_float d
| _ -> error (f_"the value for the key '%s' is not an integer") key
let objects_get_string key yvs =
let rec loop = function
| [] -> None
| x :: xs ->
(match object_find_optional key x with
| Some (Yajl_string s) -> Some s
| Some _ -> error (f_"the value for key '%s' is not a string as expected") key
| None -> loop xs
)
in
match loop yvs with
| Some s -> s
| None -> error (f_"the key '%s' was not found in a list of objects") key
let get_index ~downloader ~sigchecker
{ Sources.uri = uri; proxy = proxy } =
let uri = ensure_trailing_slash uri in
let download_and_parse uri =
let tmpfile, _ = Downloader.download downloader ~proxy uri in
let file =
if Sigchecker.verifying_signatures sigchecker then (
let tmpunsigned =
Sigchecker.verify_and_remove_signature sigchecker tmpfile in
match tmpunsigned with
| None -> assert false (* only when not verifying signatures *)
| Some f -> f
) else
tmpfile in
yajl_tree_parse (read_whole_file file) in
let downloads =
let uri_index =
if Sigchecker.verifying_signatures sigchecker then
uri ^ "streams/v1/index.sjson"
else
uri ^ "streams/v1/index.json" in
let tree = download_and_parse uri_index in
let format = object_get_string "format" tree in
if format <> "index:1.0" then
error (f_"%s is not a Simple Streams (index) v1.0 JSON file (format: %s)")
uri format;
let index = Array.to_list (object_get_object "index" tree) in
filter_map (
fun (_, desc) ->
let format = object_get_string "format" desc in
let datatype = object_get_string "datatype" desc in
match format, datatype with
| "products:1.0", "image-downloads" ->
Some (object_get_string "path" desc)
| _ -> None
) index in
let scan_product_list path =
let tree = download_and_parse (uri ^ path) in
let format = object_get_string "format" tree in
if format <> "products:1.0" then
error (f_"%s is not a Simple Streams (products) v1.0 JSON file (format: %s)")
uri format;
let products_node = object_get_object "products" tree in
let products = Array.to_list products_node in
filter_map (
fun (prod, prod_desc) ->
let arch = object_get_string "arch" prod_desc in
let prods = Array.to_list (object_get_object "versions" prod_desc) in
let prods = filter_map (
fun (rel, rel_desc) ->
let pubname = objects_get_string "pubname" [rel_desc; prod_desc] in
let items = object_find_object "items" rel_desc in
let disk_items = object_find_objects (
function
| (("disk.img"|"disk1.img"), v) -> Some v
| _ -> None
) items in
(match disk_items with
| [] -> None
| disk_item :: _ ->
let printable_name = Some pubname in
let file_uri = uri ^ (object_get_string "path" disk_item) in
let checksums =
let checksums = object_find_objects (
function
(* Since this catches all the keys, and not just
* the ones related to checksums, explicitly filter
* the supported checksums.
*)
| ("sha256"|"sha512" as t, Yajl_string c) ->
Some (Checksums.of_string t c)
| _ -> None
) disk_item in
match checksums with
| [] -> None
| x -> Some x in
let revision = Rev_string rel in
let size = object_get_number "size" disk_item in
let aliases = Some [pubname;] in
let entry = { Index.printable_name = printable_name;
osinfo = None;
file_uri = file_uri;
arch = arch;
signature_uri = None;
checksums = checksums;
revision = revision;
format = None;
size = size;
compressed_size = None;
expand = None;
lvexpand = None;
notes = [];
hidden = false;
aliases = aliases;
sigchecker = sigchecker;
proxy = proxy; } in
Some (rel, (prod, entry))
)
) prods in
(* Select the disk image with the bigger version (i.e. usually
* the most recent one. *)
let reverse_revision_compare (rev1, _) (rev2, _) = compare rev2 rev1 in
let prods = List.sort reverse_revision_compare prods in
match prods with
| [] -> None
| (_, entry) :: _ -> Some entry
) products in
let entries = List.flatten (List.map scan_product_list downloads) in
if verbose () then (
printf "simplestreams tree (%s) after parsing:\n" uri;
List.iter (Index.print_entry Pervasives.stdout) entries
);
entries
|
