Rework planning to use resolve tree and not packages

There are a range of subtle and irritating bugs that stem from
attempting to work with renames from the package set provided by cargo
metadata.

Fortunately, recent versions of cargo metadata provide a limited version
of the resolve nodes, both as the original node ids and as a newer set
providing both rename and targeting information.

As such we can (hopefully) simplify crate -> dep node resolution, remove
a bunch of subtle aliasing bugs.

Fixes google#241, fixes google#269, fixes google#270, resolves google#144, resolves google#187

impl/src/context.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::path::PathBuf;
+use std::{collections::BTreeSet, path::PathBuf, hash::{Hash, Hasher}};
 
 use crate::settings::CrateSettings;
 use semver::Version;
@@ -29,12 +29,25 @@ pub struct BuildableDependency {
   pub is_proc_macro: bool,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize)]
+#[derive(Debug, Clone, Eq, PartialOrd, Ord, Serialize)]
 pub struct DependencyAlias {
   pub target: String,
   pub alias: String,
 }
 
+// We only want equality for the first member as it can have multiple names pointing at it.
+impl Hash for DependencyAlias {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.target.hash(state);
+    }
+}
+
+impl PartialEq for DependencyAlias {
+    fn eq(&self, other: &Self) -> bool {
+        self.target == other.target
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize)]
 pub struct BuildableTarget {
   pub kind: String,
@@ -81,7 +94,7 @@ pub struct SourceDetails {
   pub git_data: Option<GitRepo>,
 }
 
-#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Default, Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
 pub struct CrateDependencyContext {
   pub dependencies: Vec<BuildableDependency>,
   pub proc_macro_dependencies: Vec<BuildableDependency>,
@@ -92,7 +105,7 @@ pub struct CrateDependencyContext {
   // build_data_dependencies can only be set when using cargo-raze as a library at the moment.
   pub build_data_dependencies: Vec<BuildableDependency>,
   pub dev_dependencies: Vec<BuildableDependency>,
-  pub aliased_dependencies: Vec<DependencyAlias>,
+  pub aliased_dependencies: BTreeSet<DependencyAlias>,
 }
 
 impl CrateDependencyContext {
@@ -110,7 +123,7 @@ impl CrateDependencyContext {
 pub struct CrateTargetedDepContext {
   pub target: String,
   pub deps: CrateDependencyContext,
-  pub conditions: Vec<String>,
+  pub platform_targets: Vec<String>,
 }
 
 #[derive(Debug, Clone, Serialize)]

impl/src/metadata.rs

@@ -438,7 +438,7 @@ impl RazeMetadataFetcher {
           let version = info.req();
           let src_dir = self.fetch_crate_src(cargo_dir.as_ref(), &name, version)?;
           checksums.insert(
-            package_ident(name, version),
+            package_ident(name, &version),
             self.fetch_crate_checksum(name, version)?,
           );
           if let Some(dirname) = src_dir.file_name() {

impl/src/planning.rs

@@ -20,7 +20,7 @@ use anyhow::Result;
 use cargo_lock::Lockfile;
 
 use crate::{
-  context::{CrateContext, WorkspaceContext},
+  context::{CrateContext, DependencyAlias, WorkspaceContext},
   metadata::RazeMetadata,
   settings::RazeSettings,
   util::PlatformDetails,
@@ -32,8 +32,13 @@ use subplanners::WorkspaceSubplanner;
 /// A ready-to-be-rendered build, containing renderable context for each crate.
 #[derive(Debug)]
 pub struct PlannedBuild {
+  /// The overall context for this workspace
   pub workspace_context: WorkspaceContext,
+  /// The creates to build for
   pub crate_contexts: Vec<CrateContext>,
+  /// And aliases that are defined at the workspace root
+  pub workspace_aliases: Vec<DependencyAlias>,
+  /// The version lock used if present
   pub lockfile: Option<Lockfile>,
 }
 
@@ -89,6 +94,7 @@ mod tests {
   use super::*;
   use cargo_metadata::PackageId;
   use indoc::indoc;
+  use itertools::Itertools;
   use semver::{Version, VersionReq};
 
   fn dummy_resolve_dropping_metadata() -> RazeMetadata {
@@ -245,22 +251,22 @@ mod tests {
     assert!(krate_position.is_some());
 
     // Get crate context using computed position
-    let krate_context = crates_with_aliased_deps[krate_position.unwrap()].clone();
+    let crate_ctx = crates_with_aliased_deps[krate_position.unwrap()].clone();
 
     // There are two default dependencies for cargo-raze-alias-test, log^0.4 and log^0.3
-    // However, log^0.3 is aliased to old_log_ while log^0.4 isn't aliased. Therefore, we
-    // should only see one aliased dependency (log^0.3 -> old_log_) which shows that the
+    // However, log^0.3 is aliased to old_log while log^0.4 isn't aliased. Therefore, we
+    // should only see one aliased dependency (log^0.3 -> old_log) which shows that the
     // name and semver matching for aliased dependencies is working correctly
-    assert!(krate_context.default_deps.aliased_dependencies.len() == 1);
-    assert_eq!(
-      krate_context.default_deps.aliased_dependencies[0].target,
-      "@raze_test__log__0_3_9//:log"
-    );
-    assert_eq!(
-      krate_context.default_deps.aliased_dependencies[0].alias,
-      "old_log_"
-    );
+    let dep = crate_ctx
+      .default_deps
+      .aliased_dependencies
+      .iter()
+      .exactly_one()
+      .unwrap();
+    assert_eq!(dep.target, "@raze_test__log__0_3_9//:log");
+    assert_eq!(dep.alias, "old_log");
   }
+
   #[test]
   fn test_plan_build_produces_proc_macro_dependencies() {
     let mut settings = dummy_raze_settings();