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revise startup, address urls pointing to same sha256 and support mirrors (upstream and in opam file) #24

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hannes merged 7 commits from startup into main 2024-11-20 10:38:22 +00:00
Conversation 1 Commits 7 Files changed 3 +53 -21
1 changed files with 53 additions and 21 deletions
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mirage/unikernel.ml
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@ -9,6 +9,10 @@ module K = struct
let doc = Arg.info ~doc:"Only check the cache" ["check"] in
Mirage_runtime.register_arg Arg.(value & flag doc)
let skip_download =
let doc = Arg.info ~doc:"Skip downloading archives" ["skip-download"] in
Mirage_runtime.register_arg Arg.(value & flag doc)
let upstream_caches =
let doc = Arg.info ~doc:"Upstream caches (e.g. https://opam.ocaml.org/cache)" ["upstream-cache"] in
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reynir commented 2024-11-19 11:42:34 +00:00
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"Upstream caches to use internally (e.g. https://opam.ocaml.org/cache). This makes opam-mirror try the cache(s) before going to the source and mirrors. This does not change the published "archive-mirrors:" value in the /repo endpoint."

"Upstream caches to use internally (e.g. https://opam.ocaml.org/cache). This makes opam-mirror try the cache(s) before going to the source and mirrors. This does *not* change the published "archive-mirrors:" value in the /repo endpoint."
hannes commented 2024-11-19 13:54:57 +00:00
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actually, if I'm not misguided, we first go to the source, and only thereafter to mirror(s). Is this a good semantics?

actually, if I'm not misguided, we first go to the source, and only thereafter to mirror(s). Is this a good semantics?
hannes commented 2024-11-19 14:00:23 +00:00
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And please feel free to push the documentation updates directly to the branch.

And please feel free to push the documentation updates directly to the branch.
reynir commented 2024-11-19 14:31:09 +00:00
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Hm it turns out the exact semantics is a bit complicated to explain. You are right that we first to go the source! Then we go to the mirrors or the cache depending on how the URLs sort as they both go into a string set.

I will give this some thought and suggest a change.

Hm it turns out the exact semantics is a bit complicated to explain. You are right that we first to go the source! Then we go to the mirrors or the cache **depending on how the URLs sort** as they both go into a string set. I will give this some thought and suggest a change.
reynir commented 2024-11-19 15:21:40 +00:00
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Latest commit splits mirror URLs from upstream cache URLs so the mirror URLs are tried first before the upstream caches, and adds a longer description of the option.

Latest commit splits mirror URLs from upstream cache URLs so the mirror URLs are tried first before the upstream caches, and adds a longer description of the option.
Mirage_runtime.register_arg Arg.(value & opt_all string [] doc)
@ -136,6 +140,10 @@ module Make
in
Lwt_stream.from more
let sha256s = Hashtbl.create 13
let empty () = Hashtbl.clear sha256s
hannes commented 2024-11-14 18:33:22 +00:00
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this code, using a global hashtable, is ugly and should be revised.

this code, using a global hashtable, is ugly and should be revised.
let find_urls acc path data =
if Mirage_kv.Key.basename path = "opam" then
let path = Mirage_kv.Key.to_string path in
@ -156,8 +164,25 @@ module Make
if HM.cardinal csums = 0 then
(add_parse_error path ("no checksums for " ^ url);
acc)
else
else begin
let url' =
match HM.find_opt `SHA256 csums with
| None -> url
| Some hash ->
match Hashtbl.find_opt sha256s hash with
| None -> Hashtbl.add sha256s hash url; url
| Some url' ->
if not (String.equal url url') then
Logs.warn (fun m -> m "same hash for url %s and %s" url url');
url'
in
let mirrors = SSet.of_list mirrors in
let url, mirrors =
if String.equal url url' then
url, mirrors
else
url', SSet.add url mirrors
in
SM.update url (function
| None -> Some (csums, SSet.union mirrors (upstream csums))
| Some (csums', mirrors') ->
@ -173,7 +198,8 @@ module Make
"mismatching hashes for %s: %s vs %s"
url (hm_to_s csums') (hm_to_s csums));
None
end) acc) acc url_csums
end) acc
end) acc url_csums
else
acc
@ -271,6 +297,7 @@ module Make
{ md5s = SM.empty ; sha512s = SM.empty ; checked = Some KS.empty ; dev; dev_md5s; dev_sha512s ; dev_swap }
let add_checked t path =
Logs.info (fun m -> m "add checked %a" Mirage_kv.Key.pp path);
match t.checked with
| None -> ()
| Some s -> t.checked <- Some (KS.add path s)
@ -620,6 +647,7 @@ module Make
let mtime = Option.value ~default:0 Ptime.(Span.to_int_s (to_span now)) in
let urls = ref SM.empty in
entries_of_git ~mtime store repo urls >>= fun entries ->
Git.empty ();
let t = Tar.out ~level:Ustar entries in
let t = Tar_gz.out_gzipped ~level:4 ~mtime:(Int32.of_int mtime) Gz.Unix t in
let buf = Buffer.create 1024 in
@ -944,6 +972,7 @@ stamp: %S
Lwt.return_unit
| false ->
let rec download url mirrors =
Logs.info (fun m -> m "downloading %s (%u mirrors)" url (SSet.cardinal mirrors));
let retry () =
if SSet.is_empty mirrors then begin
decr remaining_downloads;
@ -957,6 +986,7 @@ stamp: %S
in
let quux, body_init = Disk.init_write disk csums in
add_to_active url (Ptime.v (Pclock.now_d_ps ()));
if not (K.skip_download ()) then
Http_mirage_client.request http_client url (Disk.write_partial disk quux url) body_init >>= function
| Ok (resp, r) ->
begin match r with
@ -977,6 +1007,8 @@ stamp: %S
| Error me ->
add_failed url (Ptime.v (Pclock.now_d_ps ())) (`Mimic me);
retry ()
else
retry ()
in
download url mirrors)
(SM.bindings urls) >>= fun () ->