Source file env.ml
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open Import
module Working_dir_spec = struct
type t =
| Inherit
| Path of string
| Physical of
{ path : string
; fd : Unix.file_descr
}
end
module Working_dir = struct
module Physical = struct
type t =
| Win32
| Unix of
{ fd : Unix.file_descr
; mutable users : int
; mutex : Mutex.t
}
let create_unix fd = Unix { fd; users = 1; mutex = Mutex.create () }
let addref = function
| Win32 -> ()
| Unix u ->
Mutex.lock u.mutex;
let users = u.users + 1 in
u.users <- users;
Mutex.unlock u.mutex;
assert (users >= 2)
;;
let deref = function
| Win32 -> ()
| Unix u ->
Mutex.lock u.mutex;
let users = u.users - 1 in
u.users <- users;
Mutex.unlock u.mutex;
assert (users >= 0);
if users = 0
then (
try Unix.close u.fd with
| _ -> ())
;;
let map_unix t ~f =
match t with
| Win32 -> Win32
| Unix u -> create_unix (f u.fd)
;;
end
type t =
{ logical : string
; physical : Physical.t
}
let create (spec : Working_dir_spec.t) =
let logical, physical =
match spec with
| Inherit -> Sys.getcwd (), None
| Path p -> p, None
| Physical { path; fd } -> path, Some fd
in
let physical : Physical.t =
match physical, Sys.win32 with
| Some _, true ->
invalid_arg
"Shexp_exec.Std.Env.create: cannot use a physical working directory on Windows"
| Some fd, false -> Physical.create_unix fd
| None, true -> Win32
| None, false ->
Physical.create_unix (Unix.openfile logical [ O_CLOEXEC; O_RDONLY ] 0)
in
{ logical; physical }
;;
let split_relative_dir dir =
let rec loop dir acc =
let acc = Filename.basename dir :: acc in
let dir = Filename.dirname dir in
if dir = Filename.current_dir_name then acc else loop dir acc
in
loop dir []
;;
let chdir_logical dir relative_dir =
let rec loop dir components ~symlinks_followed =
match components with
| [] -> dir
| component :: rest ->
if component = Filename.current_dir_name
then loop dir rest ~symlinks_followed
else if component = Filename.parent_dir_name
then (
match Unix.readlink dir with
| exception Unix.Unix_error (EINVAL, _, _) ->
loop (Filename.dirname dir) rest ~symlinks_followed
| target ->
let symlinks_followed = symlinks_followed + 1 in
if symlinks_followed = 1000 then raise Exit;
if Filename.is_relative target
then loop dir (split_relative_dir target @ components) ~symlinks_followed
else loop target components ~symlinks_followed)
else loop (dir ^/ component) rest ~symlinks_followed
in
let components = split_relative_dir relative_dir in
try loop dir components ~symlinks_followed:0 with
| Exit -> raise (Unix.Unix_error (ELOOP, "chdir", dir ^/ relative_dir))
;;
let chdir t dir =
if dir = Filename.current_dir_name
then t
else (
let logical =
if Filename.is_relative dir then chdir_logical t.logical dir else dir
in
let physical =
Physical.map_unix t.physical ~f:(fun fd ->
Posixat.openat ~dir:fd ~flags:[ O_RDONLY ] ~path:dir ~perm:0)
in
{ logical; physical })
;;
let addref t = Physical.addref t.physical
let deref t = Physical.deref t.physical
end
module Uenv = struct
type t =
{ entries : string SMap.t
;
path : string list
}
let get t var = SMap.lookup var t.entries
let split_path str =
let len = String.length str in
let is_sep c = c = ':' in
let rec loop i j =
if j = len
then [ String.sub str ~pos:i ~len:(j - i) ]
else if is_sep str.[j]
then String.sub str ~pos:i ~len:(j - i) :: loop (j + 1) (j + 1)
else loop i (j + 1)
in
loop 0 0
;;
let set t var value =
let entries = SMap.add t.entries ~key:var ~data:value in
if var = "PATH" then { entries; path = split_path value } else { t with entries }
;;
let unset t var =
let entries = SMap.remove var t.entries in
if var = "PATH" then { entries; path = [] } else { t with entries }
;;
let create initial ~pwd =
let entries =
match initial with
| Some l ->
List.fold_left l ~init:SMap.empty ~f:(fun acc (key, data) ->
SMap.add acc ~key ~data)
| None ->
Array.fold_left (Unix.environment ()) ~init:SMap.empty ~f:(fun acc s ->
let i = String.index s '=' in
let key = String.sub s ~pos:0 ~len:i in
let data = String.sub s ~pos:(i + 1) ~len:(String.length s - i - 1) in
SMap.add acc ~key ~data)
in
let entries = SMap.add entries ~key:"PWD" ~data:pwd in
let path =
match SMap.find "PATH" entries with
| exception Not_found -> []
| s -> split_path s
in
{ entries; path }
;;
end
type t =
{ stdin : Unix.file_descr
; stdout : Unix.file_descr
; stderr : Unix.file_descr
; cwd : Working_dir.t
; unix_env : Uenv.t
}
let create
?(stdin = Unix.stdin)
?(stdout = Unix.stdout)
?(stderr = Unix.stderr)
?(cwd = Working_dir_spec.Inherit)
?unix_env
()
=
let cwd = Working_dir.create cwd in
let unix_env = Uenv.create unix_env ~pwd:cwd.logical in
{ stdin; stdout; stderr; cwd; unix_env }
;;
let add_cwd_ref t = Working_dir.addref t.cwd
let deref_cwd t = Working_dir.deref t.cwd
let get_env t var = Uenv.get t.unix_env var
let set_env t var value = { t with unix_env = Uenv.set t.unix_env var value }
let unset_env t var = { t with unix_env = Uenv.unset t.unix_env var }
let set_env_many t bindings =
let unix_env =
List.fold_left bindings ~init:t.unix_env ~f:(fun uenv (var, value) ->
Uenv.set uenv var value)
in
{ t with unix_env }
;;
let unset_env_many t bindings =
let unix_env = List.fold_left bindings ~init:t.unix_env ~f:Uenv.unset in
{ t with unix_env }
;;
let stdin t = t.stdin
let stdout t = t.stdout
let stderr t = t.stderr
let set_stdin t fd = { t with stdin = fd }
let set_stdout t fd = { t with stdout = fd }
let set_stderr t fd = { t with stderr = fd }
let set_outputs t fd = { t with stdout = fd; stderr = fd }
let set_stdios t ~stdin ~stdout ~stderr = { t with stdin; stdout; stderr }
let get_stdio t (which : Std_io.t) =
match which with
| Stdin -> t.stdin
| Stdout -> t.stdout
| Stderr -> t.stderr
;;
let set_stdio t (which : Std_io.t) x =
match which with
| Stdin -> set_stdin t x
| Stdout -> set_stdout t x
| Stderr -> set_stderr t x
;;
let cwd_logical t = t.cwd.logical
let chdir t dir =
let cwd = Working_dir.chdir t.cwd dir in
let unix_env = Uenv.set t.unix_env "PWD" cwd.logical in
{ t with cwd; unix_env }
;;
let find_executable t exe =
let rec loop = function
| [] -> None
| path :: rest ->
let fn = path ^/ exe in
if Sys.file_exists fn then Some fn else loop rest
in
if not (Filename.is_relative exe)
then Some exe
else if Filename.basename exe <> exe
then Some exe
else loop t.unix_env.path
;;
type run_error = Command_not_found
let spawn t ~prog ~args =
match find_executable t prog with
| None -> Error Command_not_found
| Some real_prog ->
let env =
SMap.fold t.unix_env.entries ~init:[] ~f:(fun ~key ~data acc ->
sprintf "%s=%s" key data :: acc)
|> Spawn.Env.of_list
in
let cwd : Spawn.Working_dir.t =
match t.cwd.physical with
| Win32 -> Path t.cwd.logical
| Unix u -> Fd u.fd
in
let pid =
Spawn.spawn
()
~env
~cwd
~prog:real_prog
~argv:(prog :: args)
~stdin:t.stdin
~stdout:t.stdout
~stderr:t.stderr
in
Ok pid
;;
type full_path =
| Path of string
| In_dir of Unix.file_descr * string
let mk_logical_path t path =
if Filename.is_relative path then t.cwd.logical ^/ path else path
;;
let full_path t path =
match t.cwd.physical with
| Win32 -> Path (mk_logical_path t path)
| Unix u -> In_dir (u.fd, path)
;;
type full_path2 =
| Path of string * string
| In_dir of Unix.file_descr * string * string
let full_path2 t path1 path2 =
match t.cwd.physical with
| Win32 -> Path (mk_logical_path t path1, mk_logical_path t path2)
| Unix u -> In_dir (u.fd, path1, path2)
;;
let open_file t ?(perm = 0) ~flags path =
match full_path t path with
| Path path ->
Unix.openfile
path
(O_CLOEXEC :: List.map ~f:Posixat.Open_flag.to_unix_open_flag_exn flags)
perm
| In_dir (dir, path) -> Posixat.openat ~dir ~path ~perm ~flags:(O_CLOEXEC :: flags)
;;
let close_noerr t =
try Unix.close t with
| _ -> ()
;;
let with_file t ?perm ~flags path ~f =
let fd = open_file t path ~flags ?perm in
match f fd with
| x ->
Unix.close fd;
x
| exception e ->
close_noerr fd;
raise e
;;
let mkdir_one t ~perm path =
match full_path t path with
| Path path -> Unix.mkdir path perm
| In_dir (dir, path) -> Posixat.mkdirat ~dir ~path ~perm
;;
let rec mkdir t ?(perm = 0o777) ?(p = false) path =
if not p
then mkdir_one t path ~perm
else (
try mkdir_one t path ~perm with
| Unix.Unix_error ((EEXIST | EISDIR), _, _) -> ()
| Unix.Unix_error (ENOENT, _, _) when Filename.basename path <> path ->
mkdir t (Filename.dirname path) ~perm ~p;
mkdir_one t path ~perm)
;;
let chmod t path ~perm =
match full_path t path with
| Path path -> Unix.chmod path perm
| In_dir (dir, path) -> Posixat.fchmodat ~dir ~path ~perm ~flags:[]
;;
let chown t path ~uid ~gid =
match full_path t path with
| Path path -> Unix.chown path uid gid
| In_dir (dir, path) -> Posixat.fchownat ~dir ~path ~uid ~gid ~flags:[]
;;
let rm t path =
match full_path t path with
| Path path -> Unix.unlink path
| In_dir (dir, path) -> Posixat.unlinkat ~dir ~path ~flags:[]
;;
let rmdir t path =
match full_path t path with
| Path path -> Unix.rmdir path
| In_dir (dir, path) -> Posixat.unlinkat ~dir ~path ~flags:[ AT_REMOVEDIR ]
;;
let mkfifo t ?(perm = 0o666) path =
match full_path t path with
| Path path -> Unix.mkfifo path perm
| In_dir (dir, path) -> Posixat.mkfifoat ~dir ~path ~perm
;;
let link t oldpath newpath =
match full_path2 t oldpath newpath with
| Path (oldpath, newpath) -> Unix.link oldpath newpath
| In_dir (dir, oldpath, newpath) ->
Posixat.linkat ~olddir:dir ~newdir:dir ~oldpath ~newpath ~flags:[]
;;
let symlink t oldpath newpath =
match full_path2 t oldpath newpath with
| Path (oldpath, newpath) -> Unix.symlink oldpath newpath
| In_dir (dir, oldpath, newpath) -> Posixat.symlinkat ~newdir:dir ~oldpath ~newpath
;;
let rename t oldpath newpath =
match full_path2 t oldpath newpath with
| Path (oldpath, newpath) -> Unix.rename oldpath newpath
| In_dir (dir, oldpath, newpath) ->
Posixat.renameat ~olddir:dir ~newdir:dir ~oldpath ~newpath
;;
let stat t path =
match full_path t path with
| Path path -> Unix.stat path
| In_dir (dir, path) -> Posixat.fstatat ~dir ~path ~flags:[]
;;
let lstat t path =
match full_path t path with
| Path path -> Unix.lstat path
| In_dir (dir, path) -> Posixat.fstatat ~dir ~path ~flags:[ AT_SYMLINK_NOFOLLOW ]
;;
let readlink t path =
match full_path t path with
| Path path -> Unix.readlink path
| In_dir (dir, path) -> Posixat.readlinkat ~dir ~path
;;
let access t path mode =
match full_path t path with
| Path path -> Unix.access path mode
| In_dir (dir, path) -> Posixat.faccessat ~dir ~path ~mode ~flags:[]
;;
let readdir t path =
match full_path t path with
| Path path -> Sys.readdir path |> Array.to_list
| In_dir (dir, path) ->
let fd = Posixat.openat ~dir ~path ~flags:[ O_RDONLY ] ~perm:0 in
(match Posixat.fdopendir fd with
| exception e ->
close_noerr fd;
raise e
| dh ->
let rec loop dh acc =
match Unix.readdir dh with
| "." | ".." -> loop dh acc
| fname -> loop dh (fname :: acc)
| exception End_of_file ->
Unix.closedir dh;
List.rev acc
| exception e ->
Unix.closedir dh;
raise e
in
loop dh [])
;;