Decouple install codegen handling, add error types for it

Author: tuguzT

Cargo.lock

@@ -23,7 +23,7 @@ keywords = ["gpu", "compiler", "rust-gpu"]
 license = "MIT OR Apache-2.0"
 
 [workspace.dependencies]
-spirv-builder = { git = "https://github.com/Rust-GPU/rust-gpu", rev = "3df836eb9d7b01344f52737bf9a310d1fb5a0c26", default-features = false }
+spirv-builder = { git = "https://github.com/Rust-GPU/rust-gpu", rev = "3a897aa96c83b7caede692cbf8da7e58d7014ec8", default-features = false }
 anyhow = "1.0.98"
 thiserror = "2.0.12"
 clap = { version = "4.5.41", features = ["derive"] }

Cargo.toml

@@ -11,6 +11,7 @@ license.workspace = true
 rustc_codegen_spirv-cache = { path = "../rustc_codegen_spirv-cache", default-features = false }
 cargo_metadata.workspace = true
 anyhow.workspace = true
+thiserror.workspace = true
 spirv-builder.workspace = true
 clap = { workspace = true, optional = true }
 log.workspace = true
@@ -31,7 +32,7 @@ cargo-util-schemas.workspace = true
 # Rebuilds target shader crate upon changes
 watch = ["spirv-builder/watch"]
 # Enables `clap` support for public structs
-clap = ["dep:clap", "spirv-builder/clap"]
+clap = ["dep:clap", "spirv-builder/clap", "rustc_codegen_spirv-cache/clap"]
 
 [lints]
 workspace = true

crates/cargo-gpu-cache/Cargo.toml

@@ -4,10 +4,12 @@
 
 use anyhow::Context as _;
 use spirv_builder::{CompileResult, ModuleResult, SpirvBuilder};
-use std::io::Write as _;
+use std::io::{self, Write as _};
 use std::path::PathBuf;
 
-use crate::install::Install;
+use crate::user_consent::ask_for_user_consent;
+use crate::Install;
+
 use crate::linkage::Linkage;
 use crate::lockfile::LockfileMismatchHandler;
 
@@ -63,7 +65,9 @@ pub struct Build {
 impl Build {
     /// Entrypoint
     pub fn run(&mut self) -> anyhow::Result<()> {
-        let installed_backend = self.install.run()?;
+        let skip_consent = self.install.auto_install_rust_toolchain;
+        let halt_installation = ask_for_user_consent(skip_consent);
+        let installed_backend = self.install.run(io::stdout(), halt_installation)?;
 
         let _lockfile_mismatch_handler = LockfileMismatchHandler::new(
             &self.install.shader_crate,