rust-hg-core: move from `ouroboros` to `self_cell`

`ouroboros` has a fundamental soundness problem that, while not applicable
today, could become applicable given new compiler optimizations.¹

`self_cell` is a crate that accomplishes a lot of the same things that
`ouroboros` did while remaining sound (that is, unless a new soundness issue
is discovered) by not assuming as much about the memory layout of the program.
`self_cell` has been scrutinized heavily in the past few months by very
competent people, some from the compiler team and has shown no weaknesses
for a while, with a 1.0 stable release coming out a couple months ago.

Our internal API is exactly the same, this is just an implementation detail.
To reiterate, no actual soundness issue was found with our use of `ouroboros`,
but there might be evolutions of `rustc` (or even a future separate compiler)
that could generate unsound code.

[1] https://github.com/joshua-maros/ouroboros/issues/88

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rust/hg-core/Cargo.toml

@@ -1,50 +1,50 b''
 [package]
 name = "hg-core"
 version = "0.1.0"
 authors = ["Georges Racinet <[e-mail]>"]
 description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
 edition = "2021"
 
 [lib]
 name = "hg"
 
 [dependencies]
 bitflags = "1.3.2"
 bytes-cast = "0.3.0"
 byteorder = "1.4.3"
 derive_more = "0.99.17"
 hashbrown = { version = "0.13.1", features = ["rayon"] }
 home = "0.5.4"
 im-rc = "15.1.0"
 itertools = "0.10.5"
 lazy_static = "1.4.0"
 libc = "0.2.137"
 logging_timer = "1.1.0"
-ouroboros = "0.15.5"
 rand = "0.8.5"
 rand_pcg = "0.3.1"
 rand_distr = "0.4.3"
 rayon = "1.7.0"
 regex = "1.7.0"
+self_cell = "1.0"
 sha-1 = "0.10.0"
 twox-hash = "1.6.3"
 same-file = "1.0.6"
 tempfile = "3.3.0"
 thread_local = "1.1.4"
 crossbeam-channel = "0.5.6"
 log = "0.4.17"
 memmap2 = { version = "0.5.8", features = ["stable_deref_trait"] }
 zstd = "0.12"
 format-bytes = "0.3.0"
 once_cell = "1.16.0"
 
 # We don't use the `miniz-oxide` backend to not change rhg benchmarks and until
 # we have a clearer view of which backend is the fastest.
 [dependencies.flate2]
 version = "1.0.24"
 features = ["zlib"]
 default-features = false
 
 [dev-dependencies]
 clap = { version = "4.0.24", features = ["derive"] }
 pretty_assertions = "1.1.0"

rust/hg-core/src/dirstate_tree/owning.rs

@@ -1,104 +1,91 b''
 use crate::{DirstateError, DirstateParents};
 
 use super::dirstate_map::DirstateMap;
+use self_cell::self_cell;
 use std::ops::Deref;
 
-use ouroboros::self_referencing;
-
-/// Keep a `DirstateMap<'on_disk>` next to the `on_disk` buffer that it
-/// borrows.
-#[self_referencing]
-pub struct OwningDirstateMap {
-    on_disk: Box<dyn Deref<Target = [u8]> + Send>,
-    #[borrows(on_disk)]
-    #[covariant]
-    map: DirstateMap<'this>,
-}
+self_cell!(
+    /// Keep a `DirstateMap<'owner>` next to the `owner` buffer that it
+    /// borrows.
+    pub struct OwningDirstateMap {
+        owner: Box<dyn Deref<Target = [u8]> + Send>,
+        #[covariant]
+        dependent: DirstateMap,
+    }
+);
 
 impl OwningDirstateMap {
     pub fn new_empty<OnDisk>(on_disk: OnDisk) -> Self
     where
         OnDisk: Deref<Target = [u8]> + Send + 'static,
     {
         let on_disk = Box::new(on_disk);
 
-        OwningDirstateMapBuilder {
-            on_disk,
-            map_builder: |bytes| DirstateMap::empty(bytes),
-        }
-        .build()
+        OwningDirstateMap::new(on_disk, |bytes| DirstateMap::empty(bytes))
     }
 
     pub fn new_v1<OnDisk>(
         on_disk: OnDisk,
         identity: Option<u64>,
     ) -> Result<(Self, DirstateParents), DirstateError>
     where
         OnDisk: Deref<Target = [u8]> + Send + 'static,
     {
         let on_disk = Box::new(on_disk);
         let mut parents = DirstateParents::NULL;
 
         Ok((
-            OwningDirstateMapTryBuilder {
-                on_disk,
-                map_builder: |bytes| {
-                    DirstateMap::new_v1(bytes, identity).map(|(dmap, p)| {
-                        parents = p.unwrap_or(DirstateParents::NULL);
-                        dmap
-                    })
-                },
-            }
-            .try_build()?,
+            OwningDirstateMap::try_new(on_disk, |bytes| {
+                DirstateMap::new_v1(bytes, identity).map(|(dmap, p)| {
+                    parents = p.unwrap_or(DirstateParents::NULL);
+                    dmap
+                })
+            })?,
             parents,
         ))
     }
 
     pub fn new_v2<OnDisk>(
         on_disk: OnDisk,
         data_size: usize,
         metadata: &[u8],
         uuid: Vec<u8>,
         identity: Option<u64>,
     ) -> Result<Self, DirstateError>
     where
         OnDisk: Deref<Target = [u8]> + Send + 'static,
     {
         let on_disk = Box::new(on_disk);
 
-        OwningDirstateMapTryBuilder {
-            on_disk,
-            map_builder: |bytes| {
-                DirstateMap::new_v2(bytes, data_size, metadata, uuid, identity)
-            },
-        }
-        .try_build()
+        OwningDirstateMap::try_new(on_disk, |bytes| {
+            DirstateMap::new_v2(bytes, data_size, metadata, uuid, identity)
+        })
     }
 
     pub fn with_dmap_mut<R>(
         &mut self,
         f: impl FnOnce(&mut DirstateMap) -> R,
     ) -> R {
-        self.with_map_mut(f)
+        self.with_dependent_mut(|_owner, dmap| f(dmap))
     }
 
     pub fn get_map(&self) -> &DirstateMap {
-        self.borrow_map()
+        self.borrow_dependent()
     }
 
     pub fn on_disk(&self) -> &[u8] {
-        self.borrow_on_disk()
+        self.borrow_owner()
     }
 
     pub fn old_uuid(&self) -> Option<&[u8]> {
         self.get_map().old_uuid.as_deref()
     }
 
     pub fn old_identity(&self) -> Option<u64> {
         self.get_map().identity
     }
 
     pub fn old_data_size(&self) -> usize {
         self.get_map().old_data_size
     }
 }