chore(nint): move from //users/sterni to //nix r/2833

Since //web/bubblegum depends on nint, we need to move it to a non user
directory to conform with the policy established via cl/3434.
Note that this likely doesn't mean greater stability (which isn't
really implied in depot anyways), since I still would like to use a more
elaborate calling convention to allow for additional useful features.

Change-Id: I616f905d8df13e3363674aab69a797b0d39fdd79
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3506
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

3 files changed, 0 insertions, 209 deletions

diff --git a/users/sterni/nint/README.md b/users/sterni/nint/README.md
deleted file mode 100644
index ddd8045f73..0000000000
--- a/users/sterni/nint/README.md
+++ /dev/null
@@ -1,85 +0,0 @@
-# nint — Nix INTerpreter
-
-`nint` is a shebang compatible interpreter for nix. It is currently
-implemented as a fairly trivial wrapper around `nix-instantiate --eval`.
-It allows to run nix expressions as command line tools if they conform
-to the following calling convention:
-
-* Every nix script needs to evaluate to a function which takes an
-  attribute set as its single argument. Ideally a set pattern with
-  an ellipsis should be used. By default `nint` passes the following
-  arguments:
-
-  * `currentDir`: the current working directory as a nix path
-  * `argv`: a list of arguments to the invokation including the
-    program name at `builtins.head argv`.
-  * Extra arguments can be manually passed as described below.
-
-* The return value should always be a string (throwing is also okay)
-  which is printed to stdout by `nint`.
-
-## Usage
-
-```
-nint [ --arg ARG VALUE … ] script.nix [ ARGS … ]
-```
-
-Instead of `--arg`, `--argstr` can also be used. They both work
-like the flags of the same name for `nix-instantiate` and may
-be specified any number of times as long as they are passed
-*before* the nix expression to run.
-
-Below is a shebang which also passes `depot` as an argument
-(note the usage of `env -S` to get around the shebang limitation
-to two arguments).
-
-```nix
-#!/usr/bin/env -S nint --arg depot /path/to/depot
-```
-
-## Limitations
-
-* No side effects except for writing to `stdout`.
-
-* Output is not streaming, i. e. even if the output is incrementally
-  calculated, nothing will be printed until the full output is available.
-  With plain nix strings we can't do better anyways.
-
-* Limited error handling for the script, no way to set the exit code etc.
-
-Some of these limitations may be possible to address in the future by using
-an alternative nix interpreter and a more elaborate calling convention.
-
-## Example
-
-Below is a (very simple) implementation of a `ls(1)`-like program in nix:
-
-```nix
-#!/usr/bin/env nint
-{ currentDir, argv, ... }:
-
-let
-  lib = import <nixpkgs/lib>;
-
-  dirs =
-    let
-      args = builtins.tail argv;
-    in
-      if args == []
-      then [ currentDir ]
-      else args;
-
-  makeAbsolute = p:
-    if builtins.isPath p
-    then p
-    else if builtins.match "^/.*" p != null
-    then p
-    else "${toString currentDir}/${p}";
-in
-
-  lib.concatStringsSep "\n"
-    (lib.flatten
-      (builtins.map
-        (d: (builtins.attrNames (builtins.readDir (makeAbsolute d))))
-        dirs)) + "\n"
-```
diff --git a/users/sterni/nint/default.nix b/users/sterni/nint/default.nix
deleted file mode 100644
index 5cf83d15d6..0000000000
--- a/users/sterni/nint/default.nix
+++ /dev/null
@@ -1,14 +0,0 @@
-{ depot, pkgs, ... }:
-
-let
-  inherit (depot.nix.writers)
-    rustSimpleBin
-    ;
-in
-
-  rustSimpleBin {
-    name = "nint";
-    dependencies = [
-      depot.third_party.rust-crates.serde_json
-    ];
-  } (builtins.readFile ./nint.rs)
diff --git a/users/sterni/nint/nint.rs b/users/sterni/nint/nint.rs
deleted file mode 100644
index 3d43061285..0000000000
--- a/users/sterni/nint/nint.rs
+++ /dev/null
@@ -1,110 +0,0 @@
-extern crate serde_json;
-
-use serde_json::Value;
-use std::ffi::OsString;
-use std::os::unix::ffi::{OsStringExt, OsStrExt};
-use std::io::{Error, ErrorKind, Write};
-use std::process::Command;
-
-fn render_nix_string(s: &OsString) -> OsString {
-    let mut rendered = Vec::new();
-
-    rendered.extend(b"\"");
-
-    for b in s.as_os_str().as_bytes() {
-        match char::from(*b) {
-            '\"' => rendered.extend(b"\\\""),
-            '\\' => rendered.extend(b"\\\\"),
-            '$'  => rendered.extend(b"\\$"),
-            _    => rendered.push(*b),
-        }
-    }
-
-    rendered.extend(b"\"");
-
-    OsString::from_vec(rendered)
-}
-
-fn render_nix_list(arr: &[OsString]) -> OsString {
-    let mut rendered = Vec::new();
-
-    rendered.extend(b"[ ");
-
-    for el in arr {
-        rendered.extend(render_nix_string(el).as_os_str().as_bytes());
-        rendered.extend(b" ");
-    }
-
-    rendered.extend(b"]");
-
-    OsString::from_vec(rendered)
-}
-
-fn main() -> std::io::Result<()> {
-    let mut nix_args = Vec::new();
-
-    let mut args = std::env::args_os().into_iter();
-    let mut in_args = true;
-
-    let mut argv: Vec<OsString> = Vec::new();
-
-    // skip argv[0]
-    args.next();
-
-    loop {
-        let arg = match args.next() {
-            Some(a) => a,
-            None => break,
-        };
-
-        if !arg.to_str().map(|s| s.starts_with("-")).unwrap_or(false) {
-            in_args = false;
-        }
-
-        if in_args {
-            match(arg.to_str()) {
-                Some("--arg") | Some("--argstr") => {
-                    nix_args.push(arg);
-                    nix_args.push(args.next().unwrap());
-                    nix_args.push(args.next().unwrap());
-                    Ok(())
-                }
-                _ => Err(Error::new(ErrorKind::Other, "unknown argument")),
-            }?
-        } else {
-            argv.push(arg);
-        }
-    }
-
-    if argv.len() < 1 {
-        Err(Error::new(ErrorKind::Other, "missing argv"))
-    } else {
-        let cd = std::env::current_dir()?.into_os_string();
-
-        nix_args.push(OsString::from("--arg"));
-        nix_args.push(OsString::from("currentDir"));
-        nix_args.push(cd);
-
-        nix_args.push(OsString::from("--arg"));
-        nix_args.push(OsString::from("argv"));
-        nix_args.push(render_nix_list(&argv[..]));
-
-        nix_args.push(OsString::from("--eval"));
-        nix_args.push(OsString::from("--json"));
-
-        nix_args.push(argv[0].clone());
-
-        let run = Command::new("nix-instantiate")
-                          .args(nix_args)
-                          .output()?;
-
-        match serde_json::from_slice(&run.stdout[..]) {
-            Ok(Value::String(s)) => Ok(print!("{}", s)),
-            Ok(_) => Err(Error::new(ErrorKind::Other, "output must be a string")),
-            _ => {
-                std::io::stderr().write_all(&run.stderr[..]);
-                Err(Error::new(ErrorKind::Other, "internal nix error"))
-            },
-        }
-    }
-}