package devkit
Development kit - general purpose library
Install
Dune Dependency
Authors
Maintainers
Sources
devkit-1.20240429.tbz
sha256=222f8ac131b1d970dab7eeb2714bfd6b9338b88b1082e6e01c136ae19e7eaef4
sha512=c9e6d93e3d21e5530c0f4d5baca51bf1f0a5d19248f8af7678d0665bb5cdf295d7aaaaa3e50eb2e44b8720e55097cc675af4dc8ec45acf9da39feb3eae1405d5
doc/src/devkit.core/nix.ml.html
Source file nix.ml
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(** *nix support *) open Unix open Printf open Control open Prelude open ExtLib let log = Log.from "nix" let fork () = match Lwt_unix.fork () with | -1 -> Exn.fail "failed to fork" | 0 -> Random.self_init (); Pid.update (); `Child | pid -> `Forked pid (** fork off and die *) let unparent () = match fork () with | `Child -> () | `Forked _ -> exit 0 (* http://www.itp.uzh.ch/~dpotter/howto/daemonize *) let daemonize () = unparent (); if setsid () < 0 then failwith "Can't setsid"; (* Ignore TTY signals, SIGHUP and SIGPIPE *) List.iter (fun n -> Sys.set_signal n Sys.Signal_ignore) [Sys.sigtstp; Sys.sigttou; Sys.sigttin; Sys.sighup; Sys.sigpipe]; (* umask 0; *) (* TODO investigate *) (* chdir "/"; *) (* TODO this will break lots of code - fix *) (* redirect standard channels *) let null = openfile "/dev/null" [O_RDWR] 0 in dup2 null stdin; dup2 null stdout; dup2 null stderr; close null; () let write_pidfile path = Control.bracket (open_out_gen [Open_wronly;Open_creat;Open_excl;Open_text] 0o644 path) close_out begin fun ch -> try Printf.fprintf ch "%u\n" (getpid ()); flush ch with exn -> log #warn ~exn "cannot write pidfile %s, will remove" path; Sys.remove path; raise exn end let read_pidfile path = Control.with_open_in_txt path (fun ch -> let ib = Scanf.Scanning.from_channel ch in Scanf.bscanf ib " %u " Prelude.id) let probe_pidfile path = if Sys.file_exists path then try let pid = read_pidfile path in kill pid 0; `Alive pid with | Unix_error (ESRCH, _, _) -> `Stale | e -> `Error e else `Missing let check_pidfile path = match probe_pidfile path with | `Missing -> () (* free to go *) | `Stale -> log #info "removing stale pidfile at %s" path; Sys.remove path | `Alive pid -> log #info "pid %d at %s is alive, exiting" pid path; exit 133 | `Error exn -> log #warn ~exn "wrong pid file at %s, exiting" path; exit 3 let manage_pidfile path = check_pidfile path; write_pidfile path; let pid = getpid () in at_exit (fun () -> if getpid () = pid then Exn.suppress Sys.remove path (* else forked child *)) let restart f x = let rec loop () = try f x with Unix.Unix_error (EINTR,_,_) -> loop () in loop () (** NB be careful with mutexes in signal handlers. Outputting anything to ocaml channels is a potential deadlock. Use signalfd which invokes signal handlers in predictable context. @deprecated easy to deadlock, use signalfd instead *) let handle_sig_exit_with ~exit fin = List.iter (fun signal -> Sys.set_signal signal (Sys.Signal_handle (fun _signo -> (* log #info "Received signal %i (exit)..." n; *) (try fin () with exn -> log #warn ~exn "handle_sig_exit"); (* log #info "Signal handler done.%s" (if exit then " Exiting." else ""); *) if exit then Stdlib.exit 0))) [Sys.sigint; Sys.sigterm] (** @deprecated easy to deadlock, use signalfd instead *) let handle_sig_reload_with fin = List.iter (fun signal -> Sys.set_signal signal (Sys.Signal_handle (fun _signo -> (* log #info "Received signal %i (reload)..." n; *) (try fin () with exn -> log #warn ~exn "handle_sig_reload"); (* log #info "Signal handler done." *) ))) [Sys.sighup] let show_addr = function | ADDR_UNIX s -> sprintf "unix:%s" s | ADDR_INET (addr,port) -> sprintf "%s:%u" (string_of_inet_addr addr) port let get_inet_addr_exn = function | ADDR_INET (addr,_) -> addr | addr -> Exn.fail "get_inet_addr %s" (show_addr addr) let show_inet_addr_exn addr = string_of_inet_addr (get_inet_addr_exn addr) let make_inet_addr_exn host port = let a = (gethostbyname host).h_addr_list in if Array.length a = 0 then Exn.fail "make_inet_addr %s %d" host port else ADDR_INET (a.(0), port) let inet_addr_of_string s = let open Unix in try if String.contains s ':' then let (host, port) = String.split s ":" in let port = int_of_string port in match host with | "*" -> ADDR_INET (inet_addr_any, port) | host -> make_inet_addr_exn host port else let port = int_of_string s in ADDR_INET (inet_addr_loopback, port) with _ -> (* The port or the host is invalid *) Exn.fail "invalid INET addr %S" s let unix_addr_of_string s = let open Unix in if Stre.starts_with s "unix:" then ADDR_UNIX (String.slice ~first:5 s) else Exn.fail "invalid UNIX addr %S" s let parse_addr_port_exn s = match Stre.splitc s ':' with | exception Not_found -> Exn.fail "bad host in %S (must be host:port)" s | host, port -> let port = try int_of_string port with exn -> Exn.fail ~exn "bad port %s in %S" port s in (host, port) (** Parse input as [ip:port] @return a tuple representing ip and port *) let parse_ip_port_exn s = let ip, port = parse_addr_port_exn s in let ip = try Unix.inet_addr_of_string ip with exn -> Exn.fail ~exn "bad ip %s in %S" ip s in (ip, port) (** Convert a string to a {Unix.sockaddr}. Formats supported are: - unix:file_path - host:port - *:port, using {Unix.inet_addr_any} - port, using {Unix.inet_addr_loopback} *) let sockaddr_of_string s = try unix_addr_of_string s with Failure _ -> try inet_addr_of_string s with Failure _ -> Exn.fail "sockaddr_of_string %s" s (** Execute process and capture stdout to string, @return empty string on error *) let read_process cmd = try let cin = Unix.open_process_in cmd in let input = IO.input_channel cin in let data = IO.read_all input in IO.close_in input; ignore (Unix.close_process_in cin); data with _ -> "" module Ev = Libevent (** @return IO.t to feed stdin of spawned process *) let output_process_exit cmd = let cout = Unix.open_process_out cmd in let close () = Unix.close_process_out cout in IO.create_out ~write:(output_char cout) ~output:(fun s o l -> output cout s o l; l) ~flush:(fun () -> flush cout) ~close (** @return IO.t to feed stdin of spawned process *) let output_process cmd = let cout = Unix.open_process_out cmd in let close () = match Unix.close_process_out cout with | Unix.WEXITED 0 -> () | Unix.WEXITED n -> Exn.fail "Command \"%s\": Exit code %u" cmd n | Unix.WSIGNALED n | Unix.WSTOPPED n -> Exn.fail "Command \"%s\": Terminated with signal %u" cmd n in IO.create_out ~write:(output_char cout) ~output:(fun s o l -> output cout s o l; l) ~flush:(fun () -> flush cout) ~close let write_process_exn cmd data = with_output (output_process cmd) (fun out -> IO.nwrite out data; IO.flush out) let write_process cmd data = try write_process_exn cmd data; true with _ -> false let mounts () = with_open_in_txt "/proc/mounts" @@ fun ch -> Std.input_lines ch |> Enum.filter_map (fun s -> match String.nsplit s " " with | ["rootfs";_;"rootfs";_;_;_] -> None | [dev;mount;_fs;opt;_;_] -> Some (dev, mount, String.nsplit opt ",") | _ -> Exn.fail "bad mount : %s" s) |> List.of_enum (** @param path must be normalized *) let find_mount path = assert (not @@ Filename.is_relative path); assert (not @@ Stre.exists path "//"); assert (not @@ Stre.exists path "/./"); assert (not @@ Stre.exists path "/../"); let mount = ref ("","",[]) in let bound x = let (_,b,_) = x in b in mounts () |> List.iter (fun (_,bind,_ as part) -> if Stre.starts_with path bind && String.length bind > String.length (bound !mount) then mount := part); assert (bound !mount <> ""); !mount (* in seconds *) let sleep = Unix.sleepf (** Buffered output to [Unix.file_descr]. Doesn't own the file descriptor. *) let output_buf_fd ?(bufsize=1*1024*1024) fd = if bufsize <= 0 then Exn.invalid_arg "output_fd: bufsize %d" bufsize; let buf = Bytes.create bufsize in let len = ref 0 in let flush () = match !len with | 0 -> () | _ -> let written = Unix.write fd buf 0 !len in if !len <> written then Exn.fail "output_fd: flush failed: %d <> %d" !len written; len := 0 in let check_flush () = if !len = bufsize then flush () in let rec output s p l = if l + !len > bufsize then begin let miss = bufsize - !len in Bytes.blit s p buf !len miss; len := bufsize; flush (); output s (p + miss) (l - miss) end else begin Bytes.blit s p buf !len l; len := !len + l; check_flush () end in IO.create_out ~write:(fun c -> Bytes.set buf !len c; incr len; check_flush ()) ~output:(fun s p l -> output s p l; l) ~flush ~close:flush (* do not close file descriptor, flush the buffer *) let unlimit_soft r = let (soft,hard) = U.getrlimit r in try U.setrlimit r ~soft:hard ~hard with Unix_error ((EPERM|EINVAL as error),_,_) when r = U.RLIMIT_NOFILE -> log #warn "failed to unlimit NOFILE %s -> %s : %s (check kernel limits fs.nr_open/kern.maxfilesperproc/etc), ignored" (U.Rlimit.to_string soft) (U.Rlimit.to_string hard) (error_message error) (** raise core and nofile soft limits (to the corresponding hard limits) *) let raise_limits () = unlimit_soft U.RLIMIT_CORE; unlimit_soft U.RLIMIT_NOFILE let connect fd sockaddr = let open Unix in try connect fd sockaddr with Unix_error (e, f, "") -> raise (Unix_error (e, f, show_addr sockaddr)) let connect_lwt fd sockaddr = let open Lwt_unix in Lwt.catch (fun () -> connect fd sockaddr) (function Unix_error (e, f, "") -> Lwt.fail (Unix_error (e, f, show_addr sockaddr)) | exn -> Lwt.fail exn) let get_xdg_dir ~env dir = try Sys.getenv env with Not_found -> try sprintf "%s/.%s" (Sys.getenv "HOME") dir with Not_found -> Exn.fail "get_xdg_dir: unable to find %s directory" dir let xdg_cache_dir = lazy (get_xdg_dir ~env:"XDG_DATA_CACHE" "cache") let xdg_config_dir = lazy (get_xdg_dir ~env:"XDG_CONFIG_HOME" "config") let quote_if_needed s = try Scanf.sscanf s "%_[a-zA-Z0-9:_/.-]%!" s with _ -> Filename.quote s let args = List.tl (Array.to_list Sys.argv) (* Action.args *) let cmdline = String.concat " " @@ List.map quote_if_needed @@ Array.to_list Sys.argv
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