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https://git.sr.ht/~bryan_bennett/flake_env
synced 2025-12-17 07:01:23 +01:00
Add flake input tracking
and restructure the whole codebase! Not fully tested due to #4; theoretically resolves #1
This commit is contained in:
Bryan Bennett
parent
e3688e207e
commit
6ec3bd2378
7 changed files with 175 additions and 124 deletions
246
src/flake_env.re
246
src/flake_env.re
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@ -1,246 +0,0 @@
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open Core;
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module Unix = Core_unix;
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type version_number = {
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major: int,
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minor: int,
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point: int,
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};
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[@deriving yojson]
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type watch = {
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exists: bool,
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modtime: int,
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path: string
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};
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[@deriving yojson]
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type watches = array<watch>;
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let required_direnv_version = {
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major: 2,
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minor: 21,
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point: 3
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};
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let required_nix_version = {
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major: 2,
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minor: 10,
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point: 0
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};
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// TODO: test this
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let compare_version_number = (a, b) => {
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switch (a, b) {
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| (a, b) when a.major == b.major && a.minor == b.minor && a.point == b.point => 0
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| (a, b) when a.major < b.major => -1
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| (a, b) when a.major == b.major && a.minor < b.minor => -1
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| (a, b) when a.major == b.major && a.minor == b.minor && a.point < b.point => -1
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| _ => 1
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}
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}
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let semver_re = Re.compile(Re.Posix.re({|([0-9]+)\.([0-9]+)\.([0-9]+)|}));
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let extract_version_number = (cmd) => {
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let full_cmd = cmd ++ " --version";
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switch (Core_unix.open_process_in(full_cmd) |> In_channel.input_line) {
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| Some(stdout) => {
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let substrings = Re.exec(semver_re, stdout);
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let groups = Re.Group.all(substrings);
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Ok({
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major: groups[1] |> int_of_string,
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minor: groups[2] |> int_of_string,
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point: groups[3] |> int_of_string
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})
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}
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| None => Error(Printf.sprintf("Failed executing '%s'", cmd))
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}
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};
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let is_version_new_enough = (cur, needed) => {
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switch (cur) {
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| Ok(cur) => {
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switch (compare_version_number(cur, needed)) {
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| x when x < 0 => Ok(false)
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| _ => Ok(true)
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}
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}
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| Error(e) => Error(e)
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}
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}
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let preflight_versions = () => {
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let in_direnv = switch (Sys.getenv("direnv")) {
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| Some(_) => true
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| None => false
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};
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let is_nix_new_enough = is_version_new_enough(extract_version_number("nix"), required_nix_version);
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let is_direnv_new_enough = is_version_new_enough(extract_version_number("direnv"), required_direnv_version);
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switch (in_direnv, is_direnv_new_enough, is_nix_new_enough) {
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| (false, _, _) => Error("Not in direnv!")
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| (_, Ok(false), _) => Error("Direnv version is not new enough")
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| (_, _, Ok(false)) => Error("Nix version is not new enough")
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| (_, Error(e), _) => Error(e)
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| (_, _, Error(e)) => Error(e)
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| (true, Ok(true), Ok(true)) => Ok()
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}
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};
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let preflight = (layout_directory) => {
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switch (preflight_versions()) {
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| Ok(_) => {
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switch (Sys_unix.is_directory(layout_directory)) {
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| `Yes => Ok()
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| _ => {
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Unix.mkdir_p(layout_directory);
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Ok()
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}
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}
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}
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| err => err
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}
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};
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let hash_files = (filenames) => {
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let ctx = Sha1.init();
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let () = filenames
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|> Array.filter(~f=f => switch (Sys_unix.file_exists(f)) {
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| `Yes => true
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| _ => false
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})
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|> Array.iter(~f=(f) => {
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f |> In_channel.create |> In_channel.input_all |> Sha1.update_string(ctx);
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});
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Sha1.finalize(ctx) |> Sha1.to_hex
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};
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let get_watches = () => {
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let direnv_watch_str = Sys.getenv("DIRENV_WATCHES") |> Option.value_exn(~message="Environment missing DIRENV_WATCHES");
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let proc_info = Unix.create_process(~prog="direnv", ~args=["show_dump", direnv_watch_str]);
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let sub_stdout = Unix.in_channel_of_descr(proc_info.stdout);
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switch (Unix.waitpid(proc_info.pid)) {
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| Ok() => Ok(watches_of_yojson(Yojson.Safe.from_channel(sub_stdout)))
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| _ => Error("Failed to parse watches")
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}
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};
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// TODO: Maybe make this more terse?
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let rec rmrf = (path) => {
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switch (Unix.lstat(path).st_kind) {
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| exception Unix.Unix_error(_, _, _) => ()
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| S_REG => Unix.unlink(path)
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| S_LNK => Unix.unlink(path)
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| S_DIR => {
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Sys_unix.readdir(path) |> Array.iter(~f=name => rmrf(Filename.concat(path, name)));
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Unix.rmdir(path)
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}
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| S_CHR => Printf.eprintf("Don't know how to handle Character Device file\n")
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| S_BLK => Printf.eprintf("Don't know how to handle Block Device file\n")
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| S_FIFO => Printf.eprintf("Don't know how to handle FIFO file\n")
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| S_SOCK => Printf.eprintf("Don't know how to handle Socket file\n")
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}
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};
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let clean_old_gcroots = (layout_dir) => {
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rmrf(layout_dir ++ "/flake-inputs/");
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rmrf(layout_dir);
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Unix.mkdir_p(layout_dir ++ "/flake-inputs/");
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};
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let print_cur_cache = (profile_rc) => {
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In_channel.read_all(profile_rc) |> Printf.printf("%s")
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};
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let nix = (args) => {
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let stdout_chan = Unix.open_process_in(
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"nix --extra-experimental-features \"nix-command flakes\" " ++ (args |> String.concat(~sep=" ")))
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let stdout_content = stdout_chan |> In_channel.input_all;
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let exit_code = Unix.close_process_in(stdout_chan);
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(exit_code, stdout_content)
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}
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let freshen_cache = (layout_dir, hash, flake_specifier) => {
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clean_old_gcroots(layout_dir);
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let tmp_profile = layout_dir ++ "flake-tmp-profile." ++ Core.Pid.to_string(Core_unix.getpid());
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let (exit_code, stdout_content) = nix(["print-dev-env", "--profile", tmp_profile, flake_specifier]);
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let profile = layout_dir ++ "/flake-profile-" ++ hash;
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let profile_rc = profile ++ ".rc";
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switch (exit_code) {
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| Ok() => {
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Out_channel.with_file(~f=f=> Out_channel.output_string(f, stdout_content), profile_rc);
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// TODO: flake inputs!
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switch (nix(["build", "--out-link", profile, tmp_profile])) {
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| (Ok(), _) => {
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Sys_unix.remove(tmp_profile);
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print_cur_cache(profile_rc);
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}
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| (err, _) => {
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Printf.eprintf("Failed creating gcroot: %s\n", Core_unix.Exit_or_signal.to_string_hum(err));
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exit(1);
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}
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};
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}
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| err => {
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Printf.eprintf("Failed evaluating flake: %s\n", Core_unix.Exit_or_signal.to_string_hum(err));
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exit(1);
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}
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};
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};
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// TODO: Extend to add support for additional flags, maybe?
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let main = () => {
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let argv = Sys.get_argv();
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switch (Array.length(argv)) {
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| 3 => {
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let flake_specifier = argv[1];
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let layout_directory = argv[2];
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switch (preflight(layout_directory)) {
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| Ok() => {
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switch (get_watches()) {
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| Ok(watches) => {
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let paths = Array.map(~f=watch => watch.path, watches);
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let hash = hash_files(paths);
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let profile = layout_directory ++ "/flake-profile-" ++ hash;
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let profile_rc = profile ++ ".rc";
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switch ((Sys_unix.is_file(profile_rc), Sys_unix.is_file(profile))) {
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| (`Yes, `Yes) => {
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let profile_rc_mtime = Unix.stat(profile_rc).st_mtime;
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let all_older= Array.map(~f=watch => watch.modtime, watches)
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|> Array.for_all(~f=watch_mtime => watch_mtime <= int_of_float(profile_rc_mtime))
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switch (all_older) {
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| true => print_cur_cache(profile_rc)
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| false => freshen_cache(layout_directory, hash, flake_specifier)
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}
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}
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| _ => freshen_cache(layout_directory, hash, flake_specifier)
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}
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};
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| Error(e) => {
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Printf.eprintf("%s\n", e);
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exit(1);
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}
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}
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}
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| Error(e) => {
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Printf.eprintf("%s\n", e);
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exit(1);
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}
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};
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}
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| _ => {
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Printf.eprintf("%s <flake specifier> <layout_directory>\n", argv[0]);
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exit(1);
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}
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}
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}
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let () = main();
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