Add cargo_metadata build dependency

cargo_metadata is no longer exported from aya-build.

Cargo.toml

@@ -19,6 +19,7 @@ aya-log = { git = "https://github.com/aya-rs/aya", default-features = false }
 aya-log-ebpf = { git = "https://github.com/aya-rs/aya", default-features = false }
 
 anyhow = { version = "1", default-features = false }
+cargo_metadata = { version = "0.23.0", default-features = false }
 # `std` feature is currently required to build `clap`.
 #
 # See https://github.com/clap-rs/clap/blob/61f5ee5/clap_builder/src/lib.rs#L15.

{{project-name}}/Cargo.toml

@@ -28,6 +28,7 @@ clap = { workspace = true, features = ["derive"] }
 [build-dependencies]
 anyhow = { workspace = true }
 aya-build = { workspace = true }
+cargo_metadata = { workspace = true }
 # TODO(https://github.com/rust-lang/cargo/issues/12375): this should be an artifact dependency, but
 # it's not possible to tell cargo to use `-Z build-std` to build it. We cargo-in-cargo in the build
 # script to build this, but we want to teach cargo about the dependecy so that cache invalidation

{{project-name}}/build.rs

@@ -1,5 +1,5 @@
 use anyhow::{Context as _, anyhow};
-use aya_build::{Toolchain, cargo_metadata};
+use aya_build::Toolchain;
 
 fn main() -> anyhow::Result<()> {
     let cargo_metadata::Metadata { packages, .. } = cargo_metadata::MetadataCommand::new()
@@ -10,5 +10,17 @@ fn main() -> anyhow::Result<()> {
         .into_iter()
         .find(|cargo_metadata::Package { name, .. }| name.as_str() == "{{project-name}}-ebpf")
         .ok_or_else(|| anyhow!("{{project-name}}-ebpf package not found"))?;
+    let cargo_metadata::Package {
+        name,
+        manifest_path,
+        ..
+    } = ebpf_package;
+    let ebpf_package = aya_build::Package {
+        name: name.as_str(),
+        root_dir: manifest_path
+            .parent()
+            .ok_or_else(|| anyhow!("no parent for {manifest_path}"))?
+            .as_str(),
+    };
     aya_build::build_ebpf([ebpf_package], Toolchain::default())
 }