Source file opamDownload.ml
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open OpamTypes
open OpamProcess.Job.Op
let log fmt = OpamConsole.log "CURL" fmt
exception Download_fail of string option * string
let fail (s,l) = raise (Download_fail (s,l))
let user_agent =
CString (Printf.sprintf "opam/%s" (OpamVersion.(to_string current)))
let curl_args = [
CString "--write-out", None;
CString "%%{http_code}\\n", None;
CString "--retry", None; CIdent "retry", None;
CString "--retry-delay", None; CString "2", None;
CString "--compressed",
Some (FIdent (OpamFilter.ident_of_string "compress"));
CString "--user-agent", None; user_agent, None;
CString "-L", None;
CString "-o", None; CIdent "out", None;
CIdent "url", None;
]
let wget_args = [
CString "--content-disposition", None;
CString "-t", None; CIdent "retry", None;
CString "-O", None; CIdent "out", None;
CIdent "url", None;
CString "-U", None; user_agent, None;
]
let download_args ~url ~out ~retry ?checksum ~compress =
let cmd, _ = Lazy.force OpamRepositoryConfig.(!r.download_tool) in
let cmd =
match cmd with
| [(CIdent "wget"), _] -> cmd @ wget_args
| [_] -> cmd @ curl_args
| _ -> cmd
in
OpamFilter.single_command (fun v ->
if not (OpamVariable.Full.is_global v) then None else
match OpamVariable.to_string (OpamVariable.Full.variable v) with
| "curl" -> Some (S "curl")
| "wget" -> Some (S "wget")
| "url" -> Some (S (OpamUrl.to_string url))
| "out" -> Some (S out)
| "retry" -> Some (S (string_of_int retry))
| "compress" -> Some (B compress)
| "opam-version" -> Some (S OpamVersion.(to_string current))
| "checksum" ->
OpamStd.Option.map (fun c -> S OpamHash.(to_string c)) checksum
| "hashalgo" ->
OpamStd.Option.map (fun c -> S OpamHash.(string_of_kind (kind c)))
checksum
| "hashpath" ->
OpamStd.Option.map
(fun c -> S (String.concat Filename.dir_sep OpamHash.(to_path c)))
checksum
| "hashvalue" ->
OpamStd.Option.map (fun c -> S OpamHash.(contents c)) checksum
| _ -> None)
cmd
let tool_return url ret =
match Lazy.force OpamRepositoryConfig.(!r.download_tool) with
| _, `Default ->
if OpamProcess.is_failure ret then
fail (Some "Download command failed",
Printf.sprintf "Download command failed: %s"
(OpamProcess.result_summary ret))
else Done ()
| _, `Curl ->
if OpamProcess.is_failure ret then
fail (Some "Curl failed", Printf.sprintf "Curl failed: %s"
(OpamProcess.result_summary ret));
match ret.OpamProcess.r_stdout with
| [] ->
fail (Some "curl empty response",
Printf.sprintf "curl: empty response while downloading %s"
(OpamUrl.to_string url))
| l ->
let code = List.hd (List.rev l) in
let num = try int_of_string code with Failure _ -> 999 in
if num >= 400 then
fail (Some ("curl error code " ^ code),
Printf.sprintf "curl: code %s while downloading %s"
code (OpamUrl.to_string url))
else Done ()
let download_command ~compress ?checksum ~url ~dst =
let cmd, args =
match
download_args
~url
~out:dst
~retry:OpamRepositoryConfig.(!r.retries)
?checksum
~compress
with
| cmd::args -> cmd, args
| [] ->
OpamConsole.error_and_exit `Configuration_error
"Empty custom download command"
in
OpamSystem.make_command cmd args @@> tool_return url
let really_download
?(quiet=false) ~overwrite ?(compress=false) ?checksum ?(validate=true)
~url ~dst =
assert (url.OpamUrl.backend = `http);
let tmp_dst = dst ^ ".part" in
if Sys.file_exists tmp_dst then OpamSystem.remove tmp_dst;
OpamProcess.Job.catch
(function
| Failure s as e ->
OpamSystem.remove tmp_dst;
if not quiet then OpamConsole.error "%s" s;
raise e
| e ->
OpamSystem.remove tmp_dst;
OpamStd.Exn.fatal e;
log "Could not download file at %s." (OpamUrl.to_string url);
raise e)
@@ fun () ->
download_command ~compress ?checksum ~url ~dst:tmp_dst
@@+ fun () ->
if not (Sys.file_exists tmp_dst) then
fail (Some "Downloaded file not found",
"Download command succeeded, but resulting file not found")
else if Sys.file_exists dst && not overwrite then
OpamSystem.internal_error "The downloaded file will overwrite %s." dst;
if validate &&
OpamRepositoryConfig.(!r.force_checksums <> Some false) then
OpamStd.Option.iter (fun cksum ->
if not (OpamHash.check_file tmp_dst cksum) then
fail (Some "Bad checksum",
Printf.sprintf "Bad checksum, expected %s"
(OpamHash.to_string cksum)))
checksum;
OpamSystem.mv tmp_dst dst;
Done ()
let download_as ?quiet ?validate ~overwrite ?compress ?checksum url dst =
match OpamUrl.local_file url with
| Some src ->
if src = dst then Done () else
(if OpamFilename.exists dst then
if overwrite then OpamFilename.remove dst else
OpamSystem.internal_error "The downloaded file will overwrite %s."
(OpamFilename.to_string dst);
OpamFilename.copy ~src ~dst;
Done ())
| None ->
OpamFilename.(mkdir (dirname dst));
really_download ?quiet ~overwrite ?compress ?checksum ?validate
~url
~dst:(OpamFilename.to_string dst)
let download ?quiet ?validate ~overwrite ?compress ?checksum url dstdir =
let dst =
OpamFilename.(create dstdir (Base.of_string (OpamUrl.basename url)))
in
download_as ?quiet ?validate ~overwrite ?compress ?checksum url dst @@|
fun () -> dst