Add code for formatting a disk
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2 changed files with 120 additions and 16 deletions
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@ -12,6 +12,20 @@ module Make(BLOCK : Mirage_block.S) = struct
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sha512s : Part.t ;
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}
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(* I just made these ones up... *)
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let tar_guid = Uuidm.of_string "53cd6812-46cc-474e-a141-30b3aed85f53" |> Option.get
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let cache_guid = Uuidm.of_string "22ab9cf5-6e51-45c2-998a-862e23aab264" |> Option.get
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let git_guid = Uuidm.of_string "30faa50a-4c9d-47ff-a1a5-ecfb3401c027" |> Option.get
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(* GPT uses a 72 byte utf16be encoded string for partition names *)
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let utf16be_of_ascii s =
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String.init 72
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(fun i ->
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if i mod 2 = 0 && i / 2 < String.length s then
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s.[i/2]
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else
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'\000')
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let read_partition_table info block =
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let b = Cstruct.create info.Mirage_block.sector_size in
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(* We will ignore the protective MBR at lba [0L] *)
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@ -38,14 +52,6 @@ module Make(BLOCK : Mirage_block.S) = struct
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| Ok gpt -> Lwt.return gpt
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let connect block =
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let utf16be_of_ascii s =
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String.init 72
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(fun i ->
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if i mod 2 = 0 && i / 2 < String.length s then
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s.[i/2]
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else
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'\000')
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in
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let* info = BLOCK.get_info block in
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let* gpt = read_partition_table info block in
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let tar, git_dump, md5s, sha512s =
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@ -88,4 +94,79 @@ module Make(BLOCK : Mirage_block.S) = struct
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let tar = get_part tar and git_dump = get_part git_dump
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and md5s = get_part md5s and sha512s = get_part sha512s in
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{ tar ; git_dump ; md5s ; sha512s }
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let format block ~sectors_cache ~sectors_git =
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let* { size_sectors; sector_size; _ } = BLOCK.get_info block in
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let ( let*? ) = Lwt_result.bind in
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(* ocaml-gpt uses a fixed size partition entries table. Create an empty GPT
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to figure out the first usable LBA *)
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let empty =
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Gpt.make ~sector_size ~disk_sectors:size_sectors []
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|> Result.get_ok
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in
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let*? () =
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if size_sectors <
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(* protective MBR + GPT header + GPT table *)
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let ( + ) = Int64.add in
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empty.first_usable_lba +
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min 1L (Int64.of_int (2 * Tar.Header.length / sector_size)) + sectors_cache + sectors_cache + sectors_git
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+ 1L (* backup GPT header *) then
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Lwt.return_error (`Msg "too small disk")
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else Lwt_result.return ()
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in
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let gpt =
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let partitions =
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(* Current implementation of [Gpt.Partition.make] only returns [Ok _] or
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raises [Invalid_argument _] :/ *)
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let attributes = 1L in
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let sha512s =
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Gpt.Partition.make
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~name:(utf16be_of_ascii "sha512s")
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~type_guid:cache_guid
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~attributes
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Int64.(succ (sub empty.last_usable_lba sectors_cache))
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empty.last_usable_lba
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|> Result.get_ok
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in
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let md5s =
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Gpt.Partition.make
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~name:(utf16be_of_ascii "md5s")
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~type_guid:cache_guid
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~attributes
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(Int64.sub sha512s.starting_lba sectors_cache)
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(Int64.pred sha512s.starting_lba)
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|> Result.get_ok
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in
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let git_dump =
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Gpt.Partition.make
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~name:(utf16be_of_ascii "git_dump")
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~type_guid:git_guid
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~attributes
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(Int64.sub md5s.starting_lba sectors_git)
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(Int64.pred md5s.starting_lba)
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|> Result.get_ok
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in
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let tar =
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Gpt.Partition.make
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~name:(utf16be_of_ascii "tar")
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~type_guid:tar_guid
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~attributes
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empty.first_usable_lba
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(Int64.pred git_dump.starting_lba)
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|> Result.get_ok
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in
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[ tar; git_dump; md5s; sha512s ]
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in
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Gpt.make ~sector_size ~disk_sectors:size_sectors partitions
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|> Result.get_ok
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in
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let buf =
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Cstruct.create (sector_size * (Int64.to_int gpt.first_usable_lba + 2 * Tar.Header.length))
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in
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Gptar.marshal_header ~sector_size buf gpt;
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Gpt.marshal_partition_table ~sector_size
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(Cstruct.shift buf (sector_size * Int64.to_int gpt.partition_entry_lba))
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gpt;
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BLOCK.write block 0L [ buf ]
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|> Lwt_result.map_error (fun e -> `Block e)
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end
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@ -43,14 +43,19 @@ module K = struct
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Arg.(value & opt int 80 doc)
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let sectors_cache =
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let doc = "Number of sectors reserved for each checksum cache (md5, sha512)." in
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let doc = "Number of sectors reserved for each checksum cache (md5, sha512). Only used with --initialize-disk." in
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let doc = Arg.info ~doc ["sectors-cache"] in
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Arg.(value & opt int64 Int64.(mul 4L 2048L) doc)
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let sectors_git =
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let doc = "Number of sectors reserved for git dump." in
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let doc = "Number of sectors reserved for git dump. Only used with --initialize-disk" in
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let doc = Arg.info ~doc ["sectors-git"] in
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Arg.(value & opt int64 Int64.(mul 40L (mul 2L 1024L)) doc)
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let initialize_disk =
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let doc = "Initialize the disk with a partition table. THIS IS DESTRUCTIVE!" in
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let doc = Arg.info ~doc ["initialize-disk"] in
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Arg.(value & flag doc)
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let ignore_local_git =
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let doc = "Ignore restoring locally saved git repository." in
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@ -66,12 +71,13 @@ module K = struct
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; port : int
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; sectors_cache : int64
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; sectors_git : int64
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; initialize_disk : bool
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; ignore_local_git : bool }
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let v check verify_sha256 remote parallel_downloads hook_url port
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sectors_cache sectors_git ignore_local_git =
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sectors_cache sectors_git initialize_disk ignore_local_git =
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{ check; verify_sha256; remote; parallel_downloads; hook_url; port
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; sectors_cache; sectors_git; ignore_local_git }
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; sectors_cache; sectors_git; initialize_disk; ignore_local_git }
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let setup =
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Term.(const v
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@ -83,6 +89,7 @@ module K = struct
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$ port
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$ sectors_cache
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$ sectors_git
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$ initialize_disk
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$ ignore_local_git)
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end
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@ -1011,10 +1018,9 @@ stamp: %S
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module Paf = Paf_mirage.Make(Stack.TCP)
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let start block _time _pclock stack git_ctx http_ctx
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{ K.check; verify_sha256; remote; parallel_downloads; hook_url
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; port; sectors_cache; sectors_git; ignore_local_git } =
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Part.connect block >>= fun { Part.tar ; git_dump; md5s ; sha512s } ->
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let start_mirror { Part.tar; git_dump; md5s; sha512s } stack git_ctx http_ctx
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check verify_sha256 remote parallel_downloads hook_url port
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ignore_local_git =
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KV.connect tar >>= fun kv ->
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Cache.connect git_dump >>= fun git_dump ->
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Cache.connect md5s >>= fun md5s ->
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@ -1064,4 +1070,21 @@ stamp: %S
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go ());
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download_archives parallel_downloads disk http_ctx git_kv >>= fun () ->
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(th >|= fun _v -> ())
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let start block _time _pclock stack git_ctx http_ctx
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{ K.check; verify_sha256; remote; parallel_downloads; hook_url
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; port; sectors_cache; sectors_git; initialize_disk; ignore_local_git } =
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if initialize_disk then
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Part.format block ~sectors_cache ~sectors_git >>= function
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| Ok () -> Lwt.return_unit
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| Error `Msg e ->
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Logs.err (fun m -> m "Error formatting disk: %s" e);
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exit Mirage_runtime.argument_error
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| Error `Block e ->
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Logs.err (fun m -> m "Error formatting disk: %a" BLOCK.pp_write_error e);
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exit 2
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else
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Part.connect block >>= fun parts ->
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start_mirror parts stack git_ctx http_ctx check verify_sha256 remote
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parallel_downloads hook_url port ignore_local_git
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end
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