split mount into a library crate for rust reuse

update makefile to output shared library and rust build
fix default.nix to properly get the binary name for `ln`ing - move binary to main.rs
add rustfmt and gitignore files
move build.rs file into bch_bindgen for reuse between projects
add outputs to nix flake and checks
add mount.toml to makefile

1 files changed, 74 insertions, 0 deletions

diff --git a/rust-src/bch_bindgen/build.rs b/rust-src/bch_bindgen/build.rs
new file mode 100644
index 00000000..fd570dbb
--- /dev/null
+++ b/rust-src/bch_bindgen/build.rs
@@ -0,0 +1,74 @@
+fn main() {
+	use std::path::PathBuf;
+	// use std::process::Command;
+
+	let out_dir: PathBuf = std::env::var_os("OUT_DIR").expect("ENV Var 'OUT_DIR' Expected").into();
+	let top_dir: PathBuf = std::env::var_os("CARGO_MANIFEST_DIR")
+		.expect("ENV Var 'CARGO_MANIFEST_DIR' Expected")
+		.into();
+	let libbcachefs_inc_dir =
+		std::env::var("LIBBCACHEFS_INCLUDE").unwrap_or_else(|_| top_dir.join("libbcachefs").display().to_string());
+	let libbcachefs_inc_dir = std::path::Path::new(&libbcachefs_inc_dir);
+	println!("{}", libbcachefs_inc_dir.display());
+
+	println!("cargo:rustc-link-lib=dylib=bcachefs");
+	println!("cargo:rustc-link-search={}", env!("LIBBCACHEFS_LIB"));
+
+	let _libbcachefs_dir = top_dir.join("libbcachefs").join("libbcachefs");
+	let bindings = bindgen::builder()
+		.header(top_dir.join("src").join("libbcachefs_wrapper.h").display().to_string())
+		.clang_arg(format!("-I{}", libbcachefs_inc_dir.join("include").display()))
+		.clang_arg(format!("-I{}", libbcachefs_inc_dir.display()))
+		.clang_arg("-DZSTD_STATIC_LINKING_ONLY")
+		.clang_arg("-DNO_BCACHEFS_FS")
+		.clang_arg("-D_GNU_SOURCE")
+		.derive_debug(true)
+		.derive_default(true)
+		.derive_eq(true)
+		.layout_tests(true)
+		.default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: true })
+		.allowlist_function(".*bch2_.*")
+		// .allowlist_function("bch2_read_super")
+		// .allowlist_function("bch2_sb_field_.*")
+		// .allowlist_function("bch2_super_write")
+		// .allowlist_function("bch2_chacha_encrypt_key")
+		// .allowlist_function("__bch2_super_read")
+		.allowlist_function("bio_.*")
+		.allowlist_function("bch2_super_write_fd")
+		.allowlist_function("derive_passphrase")
+		.allowlist_function("request_key")
+		.allowlist_function("add_key")
+		.allowlist_function("keyctl_search")
+		.blocklist_type("bch_extent_ptr")
+		.blocklist_type("btree_node")
+		.blocklist_type("bch_extent_crc32")
+		.blocklist_type("rhash_lock_head")
+		.blocklist_type("srcu_struct")
+		.allowlist_var("BCH_.*")
+		.allowlist_var("KEY_SPEC_.*")
+		.allowlist_type("bch_kdf_types")
+		.allowlist_type("bch_sb_field_.*")
+		.allowlist_type("bch_encrypted_key")
+		.allowlist_type("nonce")
+		.newtype_enum("bch_kdf_types")
+		.opaque_type("gendisk")
+		.opaque_type("bkey")
+		// .opaque_type("bch_extent_ptr")
+		// .opaque_type("bch_extent_crc32")
+		.opaque_type("open_bucket.*")
+		.generate()
+		.expect("BindGen Generation Failiure: [libbcachefs_wrapper]");
+	bindings
+		.write_to_file(out_dir.join("bcachefs.rs"))
+		.expect("Writing to output file failed for: `bcachefs.rs`");
+
+	let keyutils = pkg_config::probe_library("libkeyutils").expect("Failed to find keyutils lib");
+	let bindings = bindgen::builder()
+		.header(top_dir.join("src").join("keyutils_wrapper.h").display().to_string())
+		.clang_args(keyutils.include_paths.iter().map(|p| format!("-I{}", p.display())))
+		.generate()
+		.expect("BindGen Generation Failiure: [Keyutils]");
+	bindings
+		.write_to_file(out_dir.join("keyutils.rs"))
+		.expect("Writing to output file failed for: `keyutils.rs`");
+}