From 1f8fc31ddc1975a1f2e7c2fa8f7f611eab761680 Mon Sep 17 00:00:00 2001
From: Kayla Firestack <dev@kaylafire.me>
Date: Mon, 18 Oct 2021 13:27:51 -0400
Subject: 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
---
 rust-src/bch_bindgen/src/rs.rs | 58 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 rust-src/bch_bindgen/src/rs.rs

(limited to 'rust-src/bch_bindgen/src/rs.rs')

diff --git a/rust-src/bch_bindgen/src/rs.rs b/rust-src/bch_bindgen/src/rs.rs
new file mode 100644
index 00000000..4452f0b2
--- /dev/null
+++ b/rust-src/bch_bindgen/src/rs.rs
@@ -0,0 +1,58 @@
+use crate::bcachefs;
+
+pub const SUPERBLOCK_MAGIC: uuid::Uuid = uuid::Uuid::from_u128(
+	0x_c68573f6_4e1a_45ca_8265_f57f48ba6d81
+);
+	
+extern "C" {
+	pub static stdout: *mut libc::FILE;
+}
+
+pub enum ReadSuperErr {
+	Io(std::io::Error),
+}
+
+type RResult<T> = std::io::Result<std::io::Result<T>>;
+
+#[tracing_attributes::instrument(skip(opts))]
+pub fn read_super_opts(path: &std::path::Path, mut opts: bcachefs::bch_opts) -> RResult<bcachefs::bch_sb_handle> {
+	// let devp = camino::Utf8Path::from_path(devp).unwrap();
+
+	use std::os::unix::ffi::OsStrExt;
+	let path = std::ffi::CString::new(path.as_os_str().as_bytes())?;
+
+	let mut sb = std::mem::MaybeUninit::zeroed();
+
+	// use gag::{BufferRedirect};
+	// // Stop libbcachefs from spamming the output
+	// let gag = BufferRedirect::stderr().unwrap();
+	// tracing::trace!("entering libbcachefs");
+
+	let ret = unsafe { crate::bcachefs::bch2_read_super(path.as_ptr(), &mut opts, sb.as_mut_ptr()) };
+	tracing::trace!(%ret);
+
+	match -ret {
+		libc::EACCES => Err(std::io::Error::new(
+			std::io::ErrorKind::PermissionDenied,
+			"Access Permission Denied",
+		)),
+		0 => Ok(Ok(unsafe { sb.assume_init() })),
+		22 => Ok(Err(std::io::Error::new(
+			std::io::ErrorKind::InvalidData,
+			"Not a BCacheFS SuperBlock",
+		))),
+		code => {
+			tracing::debug!(msg = "BCacheFS return error code", ?code);
+			Ok(Err(std::io::Error::new(
+				std::io::ErrorKind::Other,
+				"Failed to Read SuperBlock",
+			)))
+		}
+	}
+}
+
+#[tracing_attributes::instrument]
+pub fn read_super(path: &std::path::Path) -> RResult<bcachefs::bch_sb_handle> {
+	let opts = bcachefs::bch_opts::default(); //unsafe {std::mem::MaybeUninit::zeroed().assume_init()};
+	read_super_opts(path, opts)
+}
-- 
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