Allow passing extra flags to uv sync (#107)

README.md

@@ -98,6 +98,16 @@ A list of string that selects, which extra groups you want to install with `uv s
 
 A boolean flag to toggle installation of the `uv` development dependencies. By default, it is false.
 
+### `uv_sync_flags`
+
+A list of strings, containing additional flags to pass to uv sync (useful because some flags are not configurable via
+environment variables). For example, if you want to install the package in non editable mode and keep extra packages
+installed into the environment you can do:
+
+```ini
+uv_sync_flags = --no-editable, --inexact
+```
+
 ### External package support
 
 Should tox be invoked with the [`--installpkg`](https://tox.wiki/en/stable/cli_interface.html#tox-run---installpkg) flag

src/tox_uv/_run_lock.py

@@ -44,6 +44,12 @@ def register_config(self) -> None:
             default=False,
             desc="Install dev dependencies or not",
         )
+        self.conf.add_config(
+            keys=["uv_sync_flags"],
+            of_type=list[str],
+            default=[],
+            desc="Additional flags to pass to uv sync (for flags not configurable via environment variables)",
+        )
         add_skip_missing_interpreters_to_core(self.core, self.options)
 
     def _setup_env(self) -> None:
@@ -58,6 +64,7 @@ def _setup_env(self) -> None:
             cmd.append("--no-install-project")
         if self.options.verbosity > 3:  # noqa: PLR2004
             cmd.append("-v")
+        cmd.extend(self.conf["uv_sync_flags"])
         show = self.options.verbosity > 2  # noqa: PLR2004
         outcome = self.execute(cmd, stdin=StdinSource.OFF, run_id="uv-sync", show=show)
         outcome.assert_success()

tests/test_tox_uv_lock.py

@@ -134,3 +134,36 @@ def test_uv_lock_with_install_pkg(tox_project: ToxProjectCreator, name: str) ->
         ),
     ]
     assert calls == expected
+
+
+def test_uv_sync_extra_flags(tox_project: ToxProjectCreator) -> None:
+    project = tox_project({
+        "tox.ini": """
+    [testenv]
+    runner = uv-venv-lock-runner
+    with_dev = true
+    uv_sync_flags = --no-editable, --inexact
+    commands = python hello
+    """
+    })
+    execute_calls = project.patch_execute(lambda r: 0 if r.run_id != "venv" else None)
+    result = project.run()
+    result.assert_success()
+
+    calls = [(i[0][0].conf.name, i[0][3].run_id, i[0][3].cmd) for i in execute_calls.call_args_list]
+    uv = find_uv_bin()
+
+    expected = [
+        (
+            "py",
+            "venv",
+            [uv, "venv", "-p", sys.executable, "--allow-existing", str(project.path / ".tox" / "py")],
+        ),
+        (
+            "py",
+            "uv-sync",
+            ["uv", "sync", "--frozen", "--no-editable", "--inexact"],
+        ),
+        ("py", "commands[0]", ["python", "hello"]),
+    ]
+    assert calls == expected