build: integrate rootfs building with buck2

Signed-off-by: Theo Paris <theo@theoparis.com>

Author: theoparis

.buckignore

@@ -0,0 +1,5 @@
+.rootfs-staging
+.rootfs-build.manifest
+.rootfs-extract.manifest
+efi_root
+rootfs.img

.gitignore

@@ -17,3 +17,6 @@ target/
 *.pdb
 /buck-out
 .codex
+.rootfs-staging
+.rootfs-build.manifest
+.rootfs-extract.manifest

BUCK

@@ -20,6 +20,7 @@ command_alias(
         "BUCK_OVMF_FD": "$(location :ovmf_firmware)",
         "BUCK_KERNEL_BIN": "$(location //kernel:kernel_artifact)",
         "BUCK_MKROOTFS_BIN": "$(location //tools/mkrootfs:mkrootfs)",
+        "BUCK_WIMUNPACK_BIN": "$(location //tools/wimunpack:wimunpack)",
         "BUCK_NATIVE_INIT_EXE": "$(location //userspace/native_init:native_init[init])",
         "BUCK_CHILD_EXE": "$(location //userspace/native_init:native_init[child])",
         "BUCK_NTDLL_DLL": "$(location //userspace/native_init:native_init[ntdll_dll])",

kernel/kernel.rs

@@ -35,6 +35,8 @@ use limine::{
     BaseRevision,
 };
 #[cfg(target_os = "uefi")]
+use alloc::vec;
+#[cfg(target_os = "uefi")]
 use uefi::proto::loaded_image::LoadedImage;
 #[cfg(target_os = "uefi")]
 use uefi::proto::media::block::BlockIO;
@@ -134,6 +136,8 @@ fn install_uefi_root_device(
     image_handle: uefi::Handle,
     system_table: &uefi::table::SystemTable<uefi::table::Boot>,
 ) {
+    const CRABFS_SUPERBLOCK_MAGIC: [u8; 4] = *b"XFSB";
+
     let Ok(loaded_image) = system_table
         .boot_services()
         .open_protocol_exclusive::<LoadedImage>(image_handle)
@@ -173,11 +177,16 @@ fn install_uefi_root_device(
         let io_align = media.io_align() as usize;
         let media_id = media.media_id();
         let last_block = media.last_block();
+        let mut sector0 = vec![0u8; block_size.max(4)];
+        if block_io.read_blocks(media_id, 0, &mut sector0).is_err() {
+            continue;
+        }
+        if sector0[..4] != CRABFS_SUPERBLOCK_MAGIC {
+            continue;
+        }
         let ptr = (&*block_io as *const BlockIO).cast_mut();
         core::mem::forget(block_io);
-        let replace = best
-            .as_ref()
-            .is_none_or(|(_, _, _, _, best_last_block)| last_block > *best_last_block);
+        let replace = best.is_none_or(|(_, _, _, _, best_last_block)| last_block > best_last_block);
         if replace {
             best = Some((ptr, media_id, block_size, io_align, last_block));
         }

third-party/BUCK

@@ -3851,6 +3851,24 @@ http_archive(
     visibility = [],
 )
 
+cargo.rust_library(
+    name = "serde_spanned-1",
+    srcs = [":serde_spanned-1.1.1.crate"],
+    crate = "serde_spanned",
+    crate_root = "serde_spanned-1.1.1.crate/src/lib.rs",
+    edition = "2024",
+    features = ["alloc"],
+    visibility = [],
+)
+
+http_archive(
+    name = "serde_spanned-1.1.1.crate",
+    sha256 = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26",
+    strip_prefix = "serde_spanned-1.1.1",
+    urls = ["https://static.crates.io/crates/serde_spanned/1.1.1/download"],
+    visibility = [],
+)
+
 cargo.rust_library(
     name = "sha1-0.10",
     srcs = [":sha1-0.10.6.crate"],
@@ -4577,6 +4595,51 @@ http_archive(
     visibility = [],
 )
 
+alias(
+    name = "toml",
+    actual = ":toml-1",
+    visibility = ["PUBLIC"],
+)
+
+cargo.rust_library(
+    name = "toml-1",
+    srcs = [":toml-1.1.2+spec-1.1.0.crate"],
+    crate = "toml",
+    crate_root = "toml-1.1.2+spec-1.1.0.crate/src/lib.rs",
+    edition = "2024",
+    visibility = [],
+    deps = [
+        ":serde_spanned-1",
+        ":toml_datetime-1",
+    ],
+)
+
+http_archive(
+    name = "toml-1.1.2+spec-1.1.0.crate",
+    sha256 = "81f3d15e84cbcd896376e6730314d59fb5a87f31e4b038454184435cd57defee",
+    strip_prefix = "toml-1.1.2+spec-1.1.0",
+    urls = ["https://static.crates.io/crates/toml/1.1.2+spec-1.1.0/download"],
+    visibility = [],
+)
+
+cargo.rust_library(
+    name = "toml_datetime-1",
+    srcs = [":toml_datetime-1.1.1+spec-1.1.0.crate"],
+    crate = "toml_datetime",
+    crate_root = "toml_datetime-1.1.1+spec-1.1.0.crate/src/lib.rs",
+    edition = "2024",
+    features = ["alloc"],
+    visibility = [],
+)
+
+http_archive(
+    name = "toml_datetime-1.1.1+spec-1.1.0.crate",
+    sha256 = "3165f65f62e28e0115a00b2ebdd37eb6f3b641855f9d636d3cd4103767159ad7",
+    strip_prefix = "toml_datetime-1.1.1+spec-1.1.0",
+    urls = ["https://static.crates.io/crates/toml_datetime/1.1.1+spec-1.1.0/download"],
+    visibility = [],
+)
+
 cargo.rust_library(
     name = "tower-0.5",
     srcs = [":tower-0.5.3.crate"],

third-party/Cargo.lock

@@ -26,6 +26,7 @@ goblin = { version = "0.10.5", default-features = false, features = [
     "elf32",
 ] }
 linked_list_allocator = "0.10.5"
+toml = { version = "1.1.2+spec-1.1.0", default-features = false }
 spin = "0.10.0"
 plist = "1.8.0"
 serde = { version = "1.0.228", default-features = false, features = ["derive"] }