Auto merge of #12268 - epage:direct, r=weihanglo

fix(embedded): Don't create an intermediate manifest

### What does this PR try to resolve?

More immediately, this is to unblock rust-lang/rust#112601

More generally, this gets us away from hackily writing out an out-of-line manifest from an embedded manifest.  To parse the manifest, we have to write it out so our regular manifest
loading code could handle it.  This updates the manifest parsing code to
handle it.

This doesn't mean this will work everywhere in all cases though.  For
example, ephemeral workspaces parses a manifest from the SourceId and
these won't have valid SourceIds.

As a consequence, `Cargo.lock` and `CARGO_TARGET_DIR` are changing from being next to
the temp manifest to being next to the script.  This still isn't the
desired behavior but stepping stones.

### How should we test and review this PR?

A Commit at a time

### Additional information

In production code, this does not conflict with #12255 (due to #12262) but in test code, it does.

Author: bors

Cargo.lock

@@ -13,7 +13,6 @@ exclude = [
 [workspace.dependencies]
 anyhow = "1.0.47"
 base64 = "0.21.0"
-blake3 = "1.3.3"
 bytesize = "1.0"
 cargo = { path = "" }
 cargo-credential = { version = "0.2.0", path = "credential/cargo-credential" }
@@ -114,7 +113,6 @@ path = "src/cargo/lib.rs"
 [dependencies]
 anyhow.workspace = true
 base64.workspace = true
-blake3.workspace = true
 bytesize.workspace = true
 cargo-platform.workspace = true
 cargo-util.workspace = true

Cargo.toml

@@ -106,7 +106,6 @@ allow = [
     "MIT-0",
     "Apache-2.0",
     "BSD-3-Clause",
-    "BSD-2-Clause",
     "MPL-2.0",
     "Unicode-DFS-2016",
     "CC0-1.0",

deny.toml

@@ -5,6 +5,7 @@ use std::path::Path;
 use crate::command_prelude::*;
 use crate::util::restricted_names::is_glob_pattern;
 use cargo::core::Verbosity;
+use cargo::core::Workspace;
 use cargo::ops::{self, CompileFilter, Packages};
 use cargo_util::ProcessError;
 
@@ -95,14 +96,19 @@ pub fn exec_manifest_command(config: &Config, cmd: &str, args: &[OsString]) -> C
     }
 
     let manifest_path = Path::new(cmd);
+    let manifest_path = config.cwd().join(manifest_path);
+    let manifest_path = cargo_util::paths::normalize_path(&manifest_path);
     if !manifest_path.exists() {
-        return Err(
-            anyhow::anyhow!("manifest `{}` does not exist", manifest_path.display()).into(),
-        );
+        return Err(anyhow::format_err!(
+            "manifest path `{}` does not exist",
+            manifest_path.display()
+        )
+        .into());
+    }
+    let mut ws = Workspace::new(&manifest_path, config)?;
+    if config.cli_unstable().avoid_dev_deps {
+        ws.set_require_optional_deps(false);
     }
-    let manifest_path = crate::util::try_canonicalize(manifest_path)?;
-    let script = cargo::util::toml::embedded::parse_from(&manifest_path)?;
-    let ws = cargo::util::toml::embedded::to_workspace(&script, config)?;
 
     let mut compile_opts =
         cargo::ops::CompileOptions::new(config, cargo::core::compiler::CompileMode::Build)?;

src/bin/cargo/commands/run.rs

@@ -64,6 +64,7 @@ pub struct Manifest {
     metabuild: Option<Vec<String>>,
     resolve_behavior: Option<ResolveBehavior>,
     lint_rustflags: Vec<String>,
+    embedded: bool,
 }
 
 /// When parsing `Cargo.toml`, some warnings should silenced
@@ -407,6 +408,7 @@ impl Manifest {
         metabuild: Option<Vec<String>>,
         resolve_behavior: Option<ResolveBehavior>,
         lint_rustflags: Vec<String>,
+        embedded: bool,
     ) -> Manifest {
         Manifest {
             summary,
@@ -433,6 +435,7 @@ impl Manifest {
             metabuild,
             resolve_behavior,
             lint_rustflags,
+            embedded,
         }
     }
 
@@ -500,6 +503,9 @@ impl Manifest {
     pub fn links(&self) -> Option<&str> {
         self.links.as_deref()
     }
+    pub fn is_embedded(&self) -> bool {
+        self.embedded
+    }
 
     pub fn workspace_config(&self) -> &WorkspaceConfig {
         &self.workspace

src/cargo/core/manifest.rs

@@ -726,6 +726,10 @@ impl<'cfg> Workspace<'cfg> {
         if self.members.contains(&manifest_path) {
             return Ok(());
         }
+        if is_path_dep && self.root_maybe().is_embedded() {
+            // Embedded manifests cannot have workspace members
+            return Ok(());
+        }
         if is_path_dep
             && !manifest_path.parent().unwrap().starts_with(self.root())
             && self.find_root(&manifest_path)? != self.root_manifest
@@ -1580,6 +1584,13 @@ impl MaybePackage {
             MaybePackage::Virtual(ref vm) => vm.workspace_config(),
         }
     }
+
+    fn is_embedded(&self) -> bool {
+        match self {
+            MaybePackage::Package(p) => p.manifest().is_embedded(),
+            MaybePackage::Virtual(_) => false,
+        }
+    }
 }
 
 impl WorkspaceRootConfig {

src/cargo/core/workspace.rs

@@ -393,7 +393,7 @@ fn build_lock(ws: &Workspace<'_>, orig_pkg: &Package) -> CargoResult<String> {
     let package_root = orig_pkg.root();
     let source_id = orig_pkg.package_id().source_id();
     let (manifest, _nested_paths) =
-        TomlManifest::to_real_manifest(&toml_manifest, source_id, package_root, config)?;
+        TomlManifest::to_real_manifest(&toml_manifest, false, source_id, package_root, config)?;
     let new_pkg = Package::new(manifest, orig_pkg.manifest_path());
 
     // Regenerate Cargo.lock using the old one as a guide.