refactor(tvix): share a Cargo.lock file between Rust projects r/5419

This relates to the (abandoned) cl/7256.

Introduces a Cargo workspace at //tvix that is primarily intended to
be used as a workaround for the annoying Nix+Rust tooling while having
a consistent set of dependencies.

This is driven in part by a desire to adopt crate2nix and get more
granular Nix builds for Tvix's Rust projects, and in part by a need to
split //tvix/eval into something providing the CLI (REPL etc.), and a
library providing eval, without significantly altering the structure
of build targets.

To accomplish this the workspace has been designed to allow projects
to remain independent build targets. I want to avoid lumping all the
projects together - something like //tvix/eval should always be
independent of other parts of tvix.

A helper function in //tvix/default.nix lets downstream naersk
projects construct a sparse root for the project which combines the
workspace's `Cargo.lock` with the project's own `Cargo.toml`.

Note that cargo commands in the workspace itself require the build
dependencies of _all_ projects to be present, which is currently a bit
annoying to accomplish.

This introduces some breakage:

1. It breaks usage of rust-analyser without being in a shell with the
   dependencies of *all* Tvix projects, as it is not capable of
   respecting only the subset of dependencies for a part of the
   workspace.

2. It is no longer possible to run tests using `cargo test`, as the
   test generation crate we use does not work with workspaces:

   https://github.com/frehberg/test-generator/issues/6

   This still works in the Nix build as we construct a Cargo project
   that looks like it's not in a workspace there. Until somebody fixes
   that crate / writes a new macro / does something else with the test
   suite, the way to run the tests is through the Nix build.

Long-term we'll probably want to get rid of cargo completely, it's
just a big wart and most tooling works without it if correctly
configured, but we don't have time for that now.

Change-Id: I846bff7a8429a25c077fd1e9ef4e3c34a299a4a1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7533
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

10 files changed, 262 insertions, 1707 deletions

diff --git a/tvix/eval/Cargo.lock b/tvix/Cargo.lock
index 7dab150fb9..4e2197a90c 100644
--- a/tvix/eval/Cargo.lock
+++ b/tvix/Cargo.lock
@@ -27,6 +27,24 @@ dependencies = [
 ]
 
 [[package]]
+name = "anyhow"
+version = "1.0.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
+
+[[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+
+[[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -76,6 +94,30 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
+name = "blake3"
+version = "1.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ae2468a89544a466886840aa467a25b766499f4f04bf7d9fcd10ecee9fccef"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "cc",
+ "cfg-if",
+ "constant_time_eq",
+ "digest",
+ "rayon",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cce20737498f97b993470a6e536b8523f0af7892a4f928cceb1ac5e52ebe7e"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
 name = "bstr"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -100,6 +142,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
 [[package]]
+name = "bytes"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfb24e866b15a1af2a1b663f10c6b6b8f397a84aadb828f12e5b289ec23a3a3c"
+
+[[package]]
 name = "cast"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -196,6 +244,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "constant_time_eq"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3ad85c1f65dc7b37604eb0e89748faf0b9653065f2a8ef69f96a687ec1e9279"
+
+[[package]]
 name = "countme"
 version = "3.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -281,6 +335,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
 name = "csv"
 version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -319,6 +383,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
 
 [[package]]
+name = "digest"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+ "subtle",
+]
+
+[[package]]
 name = "dirs"
 version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -423,12 +498,28 @@ dependencies = [
 ]
 
 [[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
+[[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 
 [[package]]
+name = "generic-array"
+version = "0.14.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bff49e947297f3312447abdca79f45f4738097cc82b06e72054d2223f601f1b9"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
+[[package]]
 name = "getrandom"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -598,6 +689,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "multimap"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5ce46fe64a9d73be07dcbe690a38ce1b293be448fd8ce1e6c1b8062c9f72c6a"
+
+[[package]]
 name = "nibble_vec"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -631,6 +728,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "nix-cli"
+version = "0.1.0"
+dependencies = [
+ "clap 3.2.23",
+ "tempfile",
+]
+
+[[package]]
 name = "num-traits"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -692,6 +797,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ecba01bf2678719532c5e3059e0b5f0811273d94b397088b82e3bd0a78c78fdd"
 
 [[package]]
+name = "petgraph"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5014253a1331579ce62aa67443b4a658c5e7dd03d4bc6d302b94474888143"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
+[[package]]
 name = "plotters"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -738,6 +853,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "prettyplease"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c142c0e46b57171fe0c528bee8c5b7569e80f0c17e377cd0e30ea57dbc11bb51"
+dependencies = [
+ "proc-macro2 1.0.47",
+ "syn 1.0.103",
+]
+
+[[package]]
 name = "proc-macro-error"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -798,6 +923,61 @@ dependencies = [
 ]
 
 [[package]]
+name = "prost"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0b18e655c21ff5ac2084a5ad0611e827b3f92badf79f4910b5a5c58f4d87ff0"
+dependencies = [
+ "bytes",
+ "prost-derive",
+]
+
+[[package]]
+name = "prost-build"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e330bf1316db56b12c2bcfa399e8edddd4821965ea25ddb2c134b610b1c1c604"
+dependencies = [
+ "bytes",
+ "heck",
+ "itertools",
+ "lazy_static",
+ "log",
+ "multimap",
+ "petgraph",
+ "prettyplease",
+ "prost",
+ "prost-types",
+ "regex",
+ "syn 1.0.103",
+ "tempfile",
+ "which",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "164ae68b6587001ca506d3bf7f1000bfa248d0e1217b618108fba4ec1d0cc306"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "proc-macro2 1.0.47",
+ "quote 1.0.21",
+ "syn 1.0.103",
+]
+
+[[package]]
+name = "prost-types"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "747761bc3dc48f9a34553bf65605cf6cb6288ba219f3450b4275dbd81539551a"
+dependencies = [
+ "bytes",
+ "prost",
+]
+
+[[package]]
 name = "quick-error"
 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1163,6 +1343,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "subtle"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+
+[[package]]
 name = "syn"
 version = "0.15.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1336,9 +1522,25 @@ dependencies = [
  "proc-macro2 1.0.47",
  "quote 1.0.21",
  "syn 1.0.103",
+ "tvix-eval",
+]
+
+[[package]]
+name = "tvix-store"
+version = "0.1.0"
+dependencies = [
+ "blake3",
+ "prost",
+ "prost-build",
 ]
 
 [[package]]
+name = "typenum"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+
+[[package]]
 name = "unicode-ident"
 version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1456,6 +1658,17 @@ dependencies = [
 ]
 
 [[package]]
+name = "which"
+version = "4.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c831fbbee9e129a8cf93e7747a82da9d95ba8e16621cae60ec2cdc849bacb7b"
+dependencies = [
+ "either",
+ "libc",
+ "once_cell",
+]
+
+[[package]]
 name = "winapi"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/tvix/Cargo.toml b/tvix/Cargo.toml
new file mode 100644
index 0000000000..4cc70f9040
--- /dev/null
+++ b/tvix/Cargo.toml
@@ -0,0 +1,32 @@
+# This Cargo file is a workspace configuration as per
+# https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html
+#
+# We add this file to get a coherent set of dependencies across Tvix
+# crates by sharing a Cargo.lock. This is necessary because of the
+# currently limited support for Rust builds in Nix.
+#
+# Note that this explicitly does *not* mean that //tvix should be
+# considered "one project": This is simply a workaround for a
+# technical limitation and it should be our aim to remove this
+# workspace file and make the subprojects independent.
+#
+# Note also that CI targets for actual projects should *not* be tied
+# to //tvix, but to its subprojects. A potential file at
+# //tvix/default.nix should likely *not* expose anything other than
+# extra steps or other auxiliary targets.
+
+[workspace]
+
+members = [
+  "eval",
+  "eval/builtin-macros",
+  "nix_cli",
+  "store",
+]
+
+# Add a profile to all targets that enables release optimisations, but
+# retains debug symbols. This is great for use with
+# benchmarking/profiling tools.
+[profile.release-with-debug]
+inherits = "release"
+debug = true
diff --git a/tvix/default.nix b/tvix/default.nix
new file mode 100644
index 0000000000..5b10748f3d
--- /dev/null
+++ b/tvix/default.nix
@@ -0,0 +1,14 @@
+# Nix helpers for projects under //tvix
+
+{ pkgs, ... }:
+
+{
+  # Construct a sparse tree for naersk's `root` field, for
+  # compatibility with the workspace-workaround (see top-level comment
+  # in //tvix/Cargo.toml)
+  naerskRootFor = cargoToml: pkgs.runCommand "sparse-tvix-root" { } ''
+    mkdir $out
+    cp -aT ${./Cargo.lock} $out/Cargo.lock
+    cp -aT ${cargoToml} $out/Cargo.toml
+  '';
+}
diff --git a/tvix/eval/Cargo.toml b/tvix/eval/Cargo.toml
index e0c452ed58..1b24f64013 100644
--- a/tvix/eval/Cargo.toml
+++ b/tvix/eval/Cargo.toml
@@ -60,7 +60,3 @@ backtrace_overflow = [ "backtrace-on-stack-overflow" ]
 [[bench]]
 name = "eval"
 harness = false
-
-[profile.release-with-debug]
-inherits = "release"
-debug = true
diff --git a/tvix/eval/builtin-macros/Cargo.lock b/tvix/eval/builtin-macros/Cargo.lock
deleted file mode 100644
index 353e4628bd..0000000000
--- a/tvix/eval/builtin-macros/Cargo.lock
+++ /dev/null
@@ -1,929 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "aho-corasick"
-version = "0.7.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4f55bd91a0978cbfd91c457a164bab8b4001c833b7f323132c0a4e1922dd44e"
-dependencies = [
- "memchr",
-]
-
-[[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 = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
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-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-version = "1.4.3"
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-
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-
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-checksum = "71655c45cb9845d3270c9d6df84ebe72b4dad3c2ba3f7023ad47c144e4e473a5"
-dependencies = [
- "atty",
- "bitflags",
- "clap_derive",
- "clap_lex",
- "indexmap",
- "once_cell",
- "strsim",
- "termcolor",
- "textwrap",
-]
-
-[[package]]
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-dependencies = [
- "heck",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn",
-]
-
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-version = "0.2.4"
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-checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
-dependencies = [
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-
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-name = "clipboard-win"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4ab1b92798304eedc095b53942963240037c0516452cb11aeba709d420b2219"
-dependencies = [
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- "str-buf",
- "winapi",
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-
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- "rustyline",
- "serde",
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- "smol_str",
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- "test-strategy",
- "tvix-eval-builtin-macros",
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diff --git a/tvix/eval/default.nix b/tvix/eval/default.nix
index 42722e5660..f7480e8268 100644
--- a/tvix/eval/default.nix
+++ b/tvix/eval/default.nix
@@ -3,7 +3,7 @@
 lib.fix (self: depot.third_party.naersk.buildPackage (lib.fix (naerskArgs: {
   src = depot.third_party.gitignoreSource ./.;
   # see https://github.com/nix-community/naersk/issues/169
-  root = depot.nix.sparseTree ./. [ ./Cargo.lock ./Cargo.toml ];
+  root = depot.tvix.naerskRootFor ./Cargo.toml;
 
   doCheck = true;
 
diff --git a/tvix/nix_cli/Cargo.lock b/tvix/nix_cli/Cargo.lock
deleted file mode 100644
index 668ab9d5bd..0000000000
--- a/tvix/nix_cli/Cargo.lock
+++ /dev/null
@@ -1,248 +0,0 @@
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-# It is not intended for manual editing.
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diff --git a/tvix/nix_cli/default.nix b/tvix/nix_cli/default.nix
index 5fbd61f074..d2ee579364 100644
--- a/tvix/nix_cli/default.nix
+++ b/tvix/nix_cli/default.nix
@@ -2,6 +2,7 @@
 
 depot.third_party.naersk.buildPackage {
   src = ./.;
+  root = depot.tvix.naerskRootFor ./Cargo.toml;
   doDoc = false;
   doCheck = true;
 }
diff --git a/tvix/store/Cargo.lock b/tvix/store/Cargo.lock
deleted file mode 100644
index 215579aac5..0000000000
--- a/tvix/store/Cargo.lock
+++ /dev/null
@@ -1,524 +0,0 @@
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diff --git a/tvix/store/default.nix b/tvix/store/default.nix
index 4ec94cd90d..46ebcebded 100644
--- a/tvix/store/default.nix
+++ b/tvix/store/default.nix
@@ -9,7 +9,7 @@ in
 depot.third_party.naersk.buildPackage {
   src = depot.third_party.gitignoreSource ./.;
   # see https://github.com/nix-community/naersk/issues/169
-  root = depot.nix.sparseTree ./. [ ./Cargo.lock ./Cargo.toml ];
+  root = depot.tvix.naerskRootFor ./Cargo.toml;
 
   nativeBuildInputs = [ pkgs.protobuf ];