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use knot_types::Oid;
use crate::objects::{Haves, Wants};
use super::reader;use super::revindex::{Order, OrderTable};use super::writer;use crate::error::GitError;use crate::repo::Repo;
// hashtag easter eggconst RIDX_SIGNATURE: u32 = 0x5249_4458;const MIDX_ALLOC_LIMIT_BYTES: usize = 16 * 1024 * 1024;
fn midx_path(objects_dir: &Path) -> PathBuf { objects_dir.join("pack").join("multi-pack-index")}
fn sidecar(objects_dir: &Path, checksum: &gix_hash::ObjectId, ext: &str) -> PathBuf { objects_dir .join("pack") .join(format!("multi-pack-index-{}.{ext}", checksum.to_hex()))}
pub(super) fn write(repo: &Repo) -> Result<bool, GitError> { let kind = repo.object_format().kind(); let objects_dir = repo.objects_dir(); let file = match gix_pack::multi_index::File::at( midx_path(&objects_dir), Some(MIDX_ALLOC_LIMIT_BYTES), ) { Ok(file) => file, Err(_) => return Ok(false), }; let order = OrderTable::from_file(&file); if order.len() == 0 { return Ok(false); }
let _boost = knot_resource::saturate(); let types = writer::type_index_bits(repo, &order)?; let selected = writer::selected_entries(repo, &order)?; if selected.is_empty() { return Ok(false); }
let checksum = file.checksum(); let bytes = writer::assemble(kind, &checksum, &types, &selected)?;
write_rev( &sidecar(&objects_dir, &checksum, "rev"), &order, kind, &checksum, )?; writer::install(&sidecar(&objects_dir, &checksum, "bitmap"), &bytes)?; Ok(true)}
fn write_rev( path: &Path, order: &OrderTable, kind: gix::hash::Kind, checksum: &gix_hash::ObjectId,) -> Result<(), GitError> { let hash_id: u32 = match kind { gix::hash::Kind::Sha256 => 2, _ => 1, }; let mut out = Vec::new(); out.extend_from_slice(&RIDX_SIGNATURE.to_be_bytes()); out.extend_from_slice(&1u32.to_be_bytes()); out.extend_from_slice(&hash_id.to_be_bytes()); order .index_positions_in_bit_order() .iter() .for_each(|position| out.extend_from_slice(&position.get().to_be_bytes())); out.extend_from_slice(checksum.as_slice()); let mut hasher = gix_hash::hasher(kind); hasher.update(&out); let digest = hasher .try_finalize() .map_err(|error| GitError::Backend(format!("midx revindex checksum: {error}")))?; out.extend_from_slice(digest.as_slice()); writer::install(path, &out)}
pub(super) fn reachable( repo: &Repo, wants: Wants<'_>, haves: Haves<'_>,) -> Result<Option<Vec<Oid>>, GitError> { let kind = repo.object_format().kind(); let objects_dir = repo.objects_dir(); let file = match gix_pack::multi_index::File::at( midx_path(&objects_dir), Some(MIDX_ALLOC_LIMIT_BYTES), ) { Ok(file) => file, Err(_) => return Ok(None), }; let Ok(bytes) = std::fs::read(sidecar(&objects_dir, &file.checksum(), "bitmap")) else { return Ok(None); }; let order = OrderTable::from_file(&file); let maps = reader::parse(&bytes, kind, order.len())?; super::resolve(repo, &order, &maps, wants, haves)}