chore(tvix): move nix-store CLI scaffolding to subfolder r/4419

For some reason a top-level Rust project ended up in this location,
which is incompatible with the actual project structure that's being
prepared for merge right now.

Change-Id: I9d919ad72fc7e4e4d8cbb9899e7f8d90fa7ca87a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6060
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: tazjin <tazjin@tvl.su>

6 files changed, 382 insertions, 0 deletions

diff --git a/tvix/nix_cli/Cargo.lock b/tvix/nix_cli/Cargo.lock
new file mode 100644
index 000000000000..668ab9d5bded
--- /dev/null
+++ b/tvix/nix_cli/Cargo.lock
@@ -0,0 +1,248 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "clap"
+version = "3.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6f34b09b9ee8c7c7b400fe2f8df39cafc9538b03d6ba7f4ae13e4cb90bfbb7d"
+dependencies = [
+ "atty",
+ "bitflags",
+ "indexmap",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
+ "textwrap",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "indexmap"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc633605454125dec4b66843673f01c7df2b89479b32e0ed634e43a91cff62a5"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.112"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b03d17f364a3a042d5e5d46b053bbbf82c92c9430c592dd4c064dc6ee997125"
+
+[[package]]
+name = "memchr"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
+[[package]]
+name = "nix-cli"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "tempfile",
+]
+
+[[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
+
+[[package]]
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+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
+dependencies = [
+ "rand_core",
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+
+[[package]]
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+checksum = "8383f39639269cde97d255a32bdb68c047337295414940c68bdd30c2e13203ff"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "remove_dir_all"
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+dependencies = [
+ "winapi",
+]
+
+[[package]]
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "rand",
+ "redox_syscall",
+ "remove_dir_all",
+ "winapi",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.14.2"
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+
+[[package]]
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+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/tvix/nix_cli/Cargo.toml b/tvix/nix_cli/Cargo.toml
new file mode 100644
index 000000000000..b1d1d339b45f
--- /dev/null
+++ b/tvix/nix_cli/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nix-cli"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies.clap]
+version = "3.0.5"
+[dependencies.tempfile]
+version = "3.2.0"
+
+[[bin]]
+name = "nix-store"
diff --git a/tvix/nix_cli/default.nix b/tvix/nix_cli/default.nix
new file mode 100644
index 000000000000..fb4b367ecb6f
--- /dev/null
+++ b/tvix/nix_cli/default.nix
@@ -0,0 +1,2 @@
+{ ... }:
+{ }
diff --git a/tvix/nix_cli/shell.nix b/tvix/nix_cli/shell.nix
new file mode 100644
index 000000000000..f57019cd94a4
--- /dev/null
+++ b/tvix/nix_cli/shell.nix
@@ -0,0 +1,11 @@
+let
+  depot = (import ./.. { });
+  pkgs = depot.third_party.nixpkgs;
+
+in
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.rustup
+    pkgs.rust-analyzer
+  ];
+}
diff --git a/tvix/nix_cli/src/bin/nix-store.rs b/tvix/nix_cli/src/bin/nix-store.rs
new file mode 100644
index 000000000000..e1568fff73f0
--- /dev/null
+++ b/tvix/nix_cli/src/bin/nix-store.rs
@@ -0,0 +1,104 @@
+fn main() {
+    main_args(std::env::args().collect()).unwrap_or_else(|e| e.exit());
+}
+
+pub fn main_args(args: Vec<String>) -> clap::Result<NixResult> {
+    let matches = clap::App::new("nix-store")
+        .subcommand(clap::App::new("--add").arg(clap::Arg::new("FILE").required(true).index(1)))
+        .try_get_matches_from(args.iter())?;
+    if let Some(add) = matches.subcommand_matches("--add") {
+        let file = add.value_of("FILE").expect("--add needs a file");
+        let file_contents =
+            std::fs::read_to_string(file).expect(&format!("file {} does not exist", file));
+        Ok(NixResult::FileAddedToStore {
+            content: file_contents,
+        })
+    } else {
+        panic!("read some arguments that we do not know: {:?}", args)
+    }
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum NixResult {
+    FileAddedToStore { content: String },
+}
+
+#[cfg(test)]
+mod integration_tests {
+    use std::collections::VecDeque;
+    use std::io::Write;
+
+    use super::*;
+
+    #[derive(Debug)]
+    enum NixOutput {
+        Err {
+            status: i32,
+            stdout: String,
+            stderr: String,
+        },
+        Ok {
+            stdout: String,
+            stderr: String,
+        },
+    }
+
+    fn run_nix_command(cmd: &str, args: Vec<String>) -> NixOutput {
+        let out = std::process::Command::new(cmd)
+            .args(args)
+            .output()
+            .expect(&format!("could not run {}", cmd));
+        match out.status.code().expect("no status code!") {
+            0 => NixOutput::Ok {
+                stdout: String::from_utf8_lossy(&out.stdout).trim_end().to_string(),
+                stderr: String::from_utf8_lossy(&out.stderr).trim_end().to_string(),
+            },
+            status => NixOutput::Err {
+                status,
+                stdout: String::from_utf8_lossy(&out.stdout).trim_end().to_string(),
+                stderr: String::from_utf8_lossy(&out.stderr).trim_end().to_string(),
+            },
+        }
+    }
+
+    fn nix_nix_store<'a>(args: Vec<String>) -> NixResult {
+        match run_nix_command("nix-store", args) {
+            err @ NixOutput::Err { .. } => panic!("nix-store --add failed: {:#?}", err),
+            NixOutput::Ok { stdout, .. } => NixResult::FileAddedToStore {
+                content: std::fs::read_to_string(&stdout)
+                    .expect(&format!("cannot open {} as store file", stdout)),
+            },
+        }
+    }
+
+    fn tvix_nix_store<'a>(args: Vec<String>) -> NixResult {
+        eprintln!("running tvix with arguments {:?}", args);
+        let mut args = VecDeque::from(args);
+        args.push_front("tvix-store".to_string());
+        super::main_args(Vec::from(args))
+            .unwrap_or_else(|e| panic!("clap command line parsing failed:\n{}", e))
+    }
+
+    #[test]
+    fn test_nix_store_add() {
+        let file_content = "I am a copied file";
+        let mut tempfile = tempfile::NamedTempFile::new().expect("cannot create temp file");
+        tempfile
+            .write_all(file_content.as_bytes())
+            .expect("could not write to tempfile");
+        assert_eq!(
+            tvix_nix_store(vec![
+                "--add".to_string(),
+                tempfile.path().as_os_str().to_string_lossy().into_owned()
+            ]),
+            nix_nix_store(vec![
+                "--add".to_string(),
+                tempfile.path().as_os_str().to_string_lossy().into_owned()
+            ]),
+            "added file contents were not the same"
+        );
+
+        // make sure the tempfile lives till here
+        drop(tempfile)
+    }
+}
diff --git a/tvix/nix_cli/src/main.rs b/tvix/nix_cli/src/main.rs
new file mode 100644
index 000000000000..40086e6f27ee
--- /dev/null
+++ b/tvix/nix_cli/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, tvix!");
+}