Add code for formatting a disk
This commit is contained in:
parent
77edfaacb6
commit
7853eea49b
2 changed files with 120 additions and 16 deletions
|
|
@ -12,6 +12,20 @@ module Make(BLOCK : Mirage_block.S) = struct
|
|||
sha512s : Part.t ;
|
||||
}
|
||||
|
||||
(* I just made these ones up... *)
|
||||
let tar_guid = Uuidm.of_string "53cd6812-46cc-474e-a141-30b3aed85f53" |> Option.get
|
||||
let cache_guid = Uuidm.of_string "22ab9cf5-6e51-45c2-998a-862e23aab264" |> Option.get
|
||||
let git_guid = Uuidm.of_string "30faa50a-4c9d-47ff-a1a5-ecfb3401c027" |> Option.get
|
||||
|
||||
(* GPT uses a 72 byte utf16be encoded string for partition names *)
|
||||
let utf16be_of_ascii s =
|
||||
String.init 72
|
||||
(fun i ->
|
||||
if i mod 2 = 0 && i / 2 < String.length s then
|
||||
s.[i/2]
|
||||
else
|
||||
'\000')
|
||||
|
||||
let read_partition_table info block =
|
||||
let b = Cstruct.create info.Mirage_block.sector_size in
|
||||
(* We will ignore the protective MBR at lba [0L] *)
|
||||
|
|
@ -38,14 +52,6 @@ module Make(BLOCK : Mirage_block.S) = struct
|
|||
| Ok gpt -> Lwt.return gpt
|
||||
|
||||
let connect block =
|
||||
let utf16be_of_ascii s =
|
||||
String.init 72
|
||||
(fun i ->
|
||||
if i mod 2 = 0 && i / 2 < String.length s then
|
||||
s.[i/2]
|
||||
else
|
||||
'\000')
|
||||
in
|
||||
let* info = BLOCK.get_info block in
|
||||
let* gpt = read_partition_table info block in
|
||||
let tar, git_dump, md5s, sha512s =
|
||||
|
|
@ -88,4 +94,79 @@ module Make(BLOCK : Mirage_block.S) = struct
|
|||
let tar = get_part tar and git_dump = get_part git_dump
|
||||
and md5s = get_part md5s and sha512s = get_part sha512s in
|
||||
{ tar ; git_dump ; md5s ; sha512s }
|
||||
|
||||
let format block ~sectors_cache ~sectors_git =
|
||||
let* { size_sectors; sector_size; _ } = BLOCK.get_info block in
|
||||
let ( let*? ) = Lwt_result.bind in
|
||||
(* ocaml-gpt uses a fixed size partition entries table. Create an empty GPT
|
||||
to figure out the first usable LBA *)
|
||||
let empty =
|
||||
Gpt.make ~sector_size ~disk_sectors:size_sectors []
|
||||
|> Result.get_ok
|
||||
in
|
||||
let*? () =
|
||||
if size_sectors <
|
||||
(* protective MBR + GPT header + GPT table *)
|
||||
let ( + ) = Int64.add in
|
||||
empty.first_usable_lba +
|
||||
min 1L (Int64.of_int (2 * Tar.Header.length / sector_size)) + sectors_cache + sectors_cache + sectors_git
|
||||
+ 1L (* backup GPT header *) then
|
||||
Lwt.return_error (`Msg "too small disk")
|
||||
else Lwt_result.return ()
|
||||
in
|
||||
let gpt =
|
||||
let partitions =
|
||||
(* Current implementation of [Gpt.Partition.make] only returns [Ok _] or
|
||||
raises [Invalid_argument _] :/ *)
|
||||
let attributes = 1L in
|
||||
let sha512s =
|
||||
Gpt.Partition.make
|
||||
~name:(utf16be_of_ascii "sha512s")
|
||||
~type_guid:cache_guid
|
||||
~attributes
|
||||
Int64.(succ (sub empty.last_usable_lba sectors_cache))
|
||||
empty.last_usable_lba
|
||||
|> Result.get_ok
|
||||
in
|
||||
let md5s =
|
||||
Gpt.Partition.make
|
||||
~name:(utf16be_of_ascii "md5s")
|
||||
~type_guid:cache_guid
|
||||
~attributes
|
||||
(Int64.sub sha512s.starting_lba sectors_cache)
|
||||
(Int64.pred sha512s.starting_lba)
|
||||
|> Result.get_ok
|
||||
in
|
||||
let git_dump =
|
||||
Gpt.Partition.make
|
||||
~name:(utf16be_of_ascii "git_dump")
|
||||
~type_guid:git_guid
|
||||
~attributes
|
||||
(Int64.sub md5s.starting_lba sectors_git)
|
||||
(Int64.pred md5s.starting_lba)
|
||||
|> Result.get_ok
|
||||
in
|
||||
let tar =
|
||||
Gpt.Partition.make
|
||||
~name:(utf16be_of_ascii "tar")
|
||||
~type_guid:tar_guid
|
||||
~attributes
|
||||
empty.first_usable_lba
|
||||
(Int64.pred git_dump.starting_lba)
|
||||
|> Result.get_ok
|
||||
in
|
||||
[ tar; git_dump; md5s; sha512s ]
|
||||
in
|
||||
Gpt.make ~sector_size ~disk_sectors:size_sectors partitions
|
||||
|> Result.get_ok
|
||||
in
|
||||
let buf =
|
||||
Cstruct.create (sector_size * (Int64.to_int gpt.first_usable_lba + 2 * Tar.Header.length))
|
||||
in
|
||||
Gptar.marshal_header ~sector_size buf gpt;
|
||||
Gpt.marshal_partition_table ~sector_size
|
||||
(Cstruct.shift buf (sector_size * Int64.to_int gpt.partition_entry_lba))
|
||||
gpt;
|
||||
BLOCK.write block 0L [ buf ]
|
||||
|> Lwt_result.map_error (fun e -> `Block e)
|
||||
end
|
||||
|
|
|
|||
|
|
@ -43,15 +43,20 @@ module K = struct
|
|||
Arg.(value & opt int 80 doc)
|
||||
|
||||
let sectors_cache =
|
||||
let doc = "Number of sectors reserved for each checksum cache (md5, sha512)." in
|
||||
let doc = "Number of sectors reserved for each checksum cache (md5, sha512). Only used with --initialize-disk." in
|
||||
let doc = Arg.info ~doc ["sectors-cache"] in
|
||||
Arg.(value & opt int64 Int64.(mul 4L 2048L) doc)
|
||||
|
||||
let sectors_git =
|
||||
let doc = "Number of sectors reserved for git dump." in
|
||||
let doc = "Number of sectors reserved for git dump. Only used with --initialize-disk" in
|
||||
let doc = Arg.info ~doc ["sectors-git"] in
|
||||
Arg.(value & opt int64 Int64.(mul 40L (mul 2L 1024L)) doc)
|
||||
|
||||
let initialize_disk =
|
||||
let doc = "Initialize the disk with a partition table. THIS IS DESTRUCTIVE!" in
|
||||
let doc = Arg.info ~doc ["initialize-disk"] in
|
||||
Arg.(value & flag doc)
|
||||
|
||||
let ignore_local_git =
|
||||
let doc = "Ignore restoring locally saved git repository." in
|
||||
let doc = Arg.info ~doc ["ignore-local-git"] in
|
||||
|
|
@ -66,12 +71,13 @@ module K = struct
|
|||
; port : int
|
||||
; sectors_cache : int64
|
||||
; sectors_git : int64
|
||||
; initialize_disk : bool
|
||||
; ignore_local_git : bool }
|
||||
|
||||
let v check verify_sha256 remote parallel_downloads hook_url port
|
||||
sectors_cache sectors_git ignore_local_git =
|
||||
sectors_cache sectors_git initialize_disk ignore_local_git =
|
||||
{ check; verify_sha256; remote; parallel_downloads; hook_url; port
|
||||
; sectors_cache; sectors_git; ignore_local_git }
|
||||
; sectors_cache; sectors_git; initialize_disk; ignore_local_git }
|
||||
|
||||
let setup =
|
||||
Term.(const v
|
||||
|
|
@ -83,6 +89,7 @@ module K = struct
|
|||
$ port
|
||||
$ sectors_cache
|
||||
$ sectors_git
|
||||
$ initialize_disk
|
||||
$ ignore_local_git)
|
||||
end
|
||||
|
||||
|
|
@ -1011,10 +1018,9 @@ stamp: %S
|
|||
|
||||
module Paf = Paf_mirage.Make(Stack.TCP)
|
||||
|
||||
let start block _time _pclock stack git_ctx http_ctx
|
||||
{ K.check; verify_sha256; remote; parallel_downloads; hook_url
|
||||
; port; sectors_cache; sectors_git; ignore_local_git } =
|
||||
Part.connect block >>= fun { Part.tar ; git_dump; md5s ; sha512s } ->
|
||||
let start_mirror { Part.tar; git_dump; md5s; sha512s } stack git_ctx http_ctx
|
||||
check verify_sha256 remote parallel_downloads hook_url port
|
||||
ignore_local_git =
|
||||
KV.connect tar >>= fun kv ->
|
||||
Cache.connect git_dump >>= fun git_dump ->
|
||||
Cache.connect md5s >>= fun md5s ->
|
||||
|
|
@ -1064,4 +1070,21 @@ stamp: %S
|
|||
go ());
|
||||
download_archives parallel_downloads disk http_ctx git_kv >>= fun () ->
|
||||
(th >|= fun _v -> ())
|
||||
|
||||
let start block _time _pclock stack git_ctx http_ctx
|
||||
{ K.check; verify_sha256; remote; parallel_downloads; hook_url
|
||||
; port; sectors_cache; sectors_git; initialize_disk; ignore_local_git } =
|
||||
if initialize_disk then
|
||||
Part.format block ~sectors_cache ~sectors_git >>= function
|
||||
| Ok () -> Lwt.return_unit
|
||||
| Error `Msg e ->
|
||||
Logs.err (fun m -> m "Error formatting disk: %s" e);
|
||||
exit Mirage_runtime.argument_error
|
||||
| Error `Block e ->
|
||||
Logs.err (fun m -> m "Error formatting disk: %a" BLOCK.pp_write_error e);
|
||||
exit 2
|
||||
else
|
||||
Part.connect block >>= fun parts ->
|
||||
start_mirror parts stack git_ctx http_ctx check verify_sha256 remote
|
||||
parallel_downloads hook_url port ignore_local_git
|
||||
end
|
||||
|
|
|
|||
Loading…
Reference in a new issue