Source file `cmd.ml`

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open Lwt.Infix

let dir_exists d =
  match Bos.OS.Dir.exists d with
  | Ok x -> x
  | Error (`Msg x) -> failwith x

let hexchars = "0123456789abcdef"

let pp_hex f d =
  for x = 0 to Cstruct.len d - 1 do
    let byte = Cstruct.get_uint8 d x in
    Fmt.pf f "%02x" byte
  done

let id_of_repo repo =
  let module Hash = Mirage_crypto.Hash.SHA256 in
  let base = Filename.basename repo in
  let digest = Hash.digest (Cstruct.of_string repo) in
  Fmt.str "%s-%a" base pp_hex digest

(* .../var/git/myrepo-hhh *)
let local_copy repo =
  let repos_dir = Current.state_dir "git" in
  Fpath.append repos_dir (Fpath.v (id_of_repo repo))

let git ~cancellable ~job ?cwd args =
  let args =
    match cwd with
    | None -> args
    | Some cwd -> "-C" :: Fpath.to_string cwd :: args
  in
  let cmd = Array.of_list ("git" :: args) in
  Current.Process.exec ~cancellable ~job ("", cmd)

let git_clone ~cancellable ~job ~src dst =
  git ~cancellable ~job ["clone"; "--recursive"; "-q"; src; Fpath.to_string dst]

let git_fetch ~cancellable ~job ~src ~dst gref =
  git ~cancellable ~job ~cwd:dst ["fetch"; "-f"; src; gref]

let git_reset_hard ~job ~repo hash =
  git ~cancellable:false ~job ~cwd:repo ["reset"; "--hard"; hash]

let git_remote_set_url ~job ~repo ~remote url =
  git ~cancellable:false ~job ~cwd:repo ["remote"; "set-url"; remote; url]

let git_rev_parse ?(cancellable=false) ~job ~repo x =
  let cmd = ["git"; "-C"; Fpath.to_string repo; "rev-parse"; x] in
  Current.Process.check_output ~cancellable ~job ("", Array.of_list cmd) >|= Stdlib.Result.map String.trim

let cp_r ~cancellable ~job ~src ~dst =
  let cmd = [| "cp"; "-a"; "--"; Fpath.to_string src; Fpath.to_string dst |] in
  Current.Process.exec ~cancellable ~job ("", cmd)

let git_submodule_update ~cancellable ~job ~repo =
  git ~cancellable ~job ~cwd:repo ["submodule"; "update"; "--init"; "--recursive"]