--- a/mercurial/policy.py	Fri Dec 06 00:58:45 2024 -0500
+++ b/mercurial/policy.py	Mon Nov 27 12:21:44 2023 -0500
@@ -132,7 +132,9 @@
     return policy.endswith(b'-allow')
 
 
-def importrust(modname: str, member: "Optional[str]" = None, default=None):
+def importrust(
+    modname: str, member: "Optional[str]" = None, default=None, pyo3=False
+):
     """Import Rust module according to policy and availability.
 
     If policy isn't a Rust one, this returns `default`.
@@ -143,8 +145,10 @@
     if not policy.startswith(b'rust'):
         return default
 
+    dlib_name = "pyo3-rustext" if pyo3 else "rustext"
+
     try:
-        mod = _importfrom('rustext', modname)
+        mod = _importfrom(dlib_name, modname)
     except ImportError:
         if _isrustpermissive():
             return default

--- a/rust/Cargo.lock	Fri Dec 06 00:58:45 2024 -0500
+++ b/rust/Cargo.lock	Mon Nov 27 12:21:44 2023 -0500
@@ -95,6 +95,17 @@
 ]
 
 [[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
 name = "autocfg"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -259,7 +270,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ac6a0c7b1a9e9a5186361f67dfa1b88213572f427fb9ab038efb2bd8c582dab"
 dependencies = [
- "heck",
+ "heck 0.5.0",
  "proc-macro2",
  "quote",
  "syn 2.0.89",
@@ -475,6 +486,19 @@
 
 [[package]]
 name = "env_logger"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a12e6657c4c97ebab115a42dcee77225f7f482cdd841cf7088c657a42e9e00e7"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
+[[package]]
+name = "env_logger"
 version = "0.11.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e13fa619b91fb2381732789fc5de83b45675e882f66623b7d8cb4f643017018d"
@@ -601,11 +625,26 @@
 
 [[package]]
 name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
+name = "heck"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
 [[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
 name = "hex"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -665,7 +704,7 @@
 dependencies = [
  "cpython",
  "crossbeam-channel",
- "env_logger",
+ "env_logger 0.11.5",
  "hg-core",
  "libc",
  "log",
@@ -676,6 +715,17 @@
 ]
 
 [[package]]
+name = "hg-pyo3"
+version = "0.1.0"
+dependencies = [
+ "env_logger 0.9.3",
+ "hg-core",
+ "log",
+ "pyo3",
+ "stable_deref_trait",
+]
+
+[[package]]
 name = "home"
 version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -751,6 +801,12 @@
 ]
 
 [[package]]
+name = "indoc"
+version = "2.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b248f5224d1d606005e02c97f5aa4e88eeb230488bcc03bc9ca4d7991399f2b5"
+
+[[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -830,6 +886,16 @@
 checksum = "78b3ae25bc7c8c38cec158d1f2757ee79e9b3740fbc7ccf0e59e4b08d793fa89"
 
 [[package]]
+name = "lock_api"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
+[[package]]
 name = "log"
 version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -874,6 +940,15 @@
 ]
 
 [[package]]
+name = "memoffset"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
 name = "miniz_oxide"
 version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -947,6 +1022,29 @@
 ]
 
 [[package]]
+name = "parking_lot"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bf18183cf54e8d6059647fc3063646a1801cf30896933ec2311622cc4b9a27"
+dependencies = [
+ "lock_api",
+ "parking_lot_core",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e401f977ab385c9e4e3ab30627d6f26d00e2c73eef317493c4ec6d468726cf8"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
 name = "paste"
 version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -993,6 +1091,69 @@
 ]
 
 [[package]]
+name = "pyo3"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53bdbb96d49157e65d45cc287af5f32ffadd5f4761438b527b055fb0d4bb8233"
+dependencies = [
+ "cfg-if",
+ "indoc",
+ "libc",
+ "memoffset",
+ "parking_lot",
+ "portable-atomic",
+ "pyo3-build-config",
+ "pyo3-ffi",
+ "pyo3-macros",
+ "unindent",
+]
+
+[[package]]
+name = "pyo3-build-config"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "deaa5745de3f5231ce10517a1f5dd97d53e5a2fd77aa6b5842292085831d48d7"
+dependencies = [
+ "once_cell",
+ "target-lexicon",
+]
+
+[[package]]
+name = "pyo3-ffi"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b42531d03e08d4ef1f6e85a2ed422eb678b8cd62b762e53891c05faf0d4afa"
+dependencies = [
+ "libc",
+ "pyo3-build-config",
+]
+
+[[package]]
+name = "pyo3-macros"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7305c720fa01b8055ec95e484a6eca7a83c841267f0dd5280f0c8b8551d2c158"
+dependencies = [
+ "proc-macro2",
+ "pyo3-macros-backend",
+ "quote",
+ "syn 2.0.89",
+]
+
+[[package]]
+name = "pyo3-macros-backend"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c7e9b68bb9c3149c5b0cade5d07f953d6d125eb4337723c4ccdb665f1f96185"
+dependencies = [
+ "heck 0.4.1",
+ "proc-macro2",
+ "pyo3-build-config",
+ "quote",
+ "syn 2.0.89",
+]
+
+[[package]]
 name = "python3-sys"
 version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1192,7 +1353,7 @@
  "chrono",
  "clap",
  "derive_more",
- "env_logger",
+ "env_logger 0.11.5",
  "format-bytes",
  "hg-core",
  "home",
@@ -1250,6 +1411,12 @@
 ]
 
 [[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
+[[package]]
 name = "self_cell"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1342,6 +1509,12 @@
 ]
 
 [[package]]
+name = "smallvec"
+version = "1.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
+
+[[package]]
 name = "stable_deref_trait"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1388,6 +1561,12 @@
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
 [[package]]
+name = "target-lexicon"
+version = "0.12.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
+
+[[package]]
 name = "tempfile"
 version = "3.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1401,6 +1580,15 @@
 ]
 
 [[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
 name = "thiserror"
 version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1500,6 +1688,12 @@
 checksum = "1fc81956842c57dac11422a97c3b8195a1ff727f06e85c84ed2e8aa277c9a0fd"
 
 [[package]]
+name = "unindent"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7de7d73e1754487cb58364ee906a499937a0dfabd86bcb980fa99ec8c8fa2ce"
+
+[[package]]
 name = "utf8parse"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1654,6 +1848,22 @@
 ]
 
 [[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
 name = "winapi-util"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1663,6 +1873,12 @@
 ]
 
 [[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
 name = "windows-core"
 version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"

--- a/rust/Cargo.toml	Fri Dec 06 00:58:45 2024 -0500
+++ b/rust/Cargo.toml	Mon Nov 27 12:21:44 2023 -0500
@@ -1,4 +1,4 @@
 [workspace]
-members = ["hg-core", "hg-cpython", "rhg"]
+members = ["hg-core", "hg-cpython", "hg-pyo3", "rhg"]
 exclude = ["chg", "hgcli"]
 resolver = "2"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hg-pyo3/Cargo.toml	Mon Nov 27 12:21:44 2023 -0500
@@ -0,0 +1,15 @@
+[package]
+name = "hg-pyo3"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name='rusthgpyo3'
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { version = "0.20.0", features = ["extension-module"] }
+hg-core = { path = "../hg-core"}
+stable_deref_trait = "1.2.0"
+log = "0.4.17"
+env_logger = "0.9.3"
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hg-pyo3/src/lib.rs	Mon Nov 27 12:21:44 2023 -0500
@@ -0,0 +1,6 @@
+use pyo3::prelude::*;
+
+#[pymodule]
+fn pyo3_rustext(_py: Python<'_>, _m: &PyModule) -> PyResult<()> {
+    Ok(())
+}

--- a/setup.py	Fri Dec 06 00:58:45 2024 -0500
+++ b/setup.py	Mon Nov 27 12:21:44 2023 -0500
@@ -1662,6 +1662,11 @@
         'hg-cpython',
         'librusthg',
     ),
+    RustStandaloneExtension(
+        'mercurial.pyo3-rustext',
+        'hg-pyo3',
+        'librusthgpyo3',
+    ),
 ]