Fix default injection path

python/binharness/common/busybox.py

@@ -23,7 +23,7 @@ class BusyboxInjection(ExecutableInjection):
 
     def __init__(self: BusyboxInjection) -> None:
         """Create a BusyboxInjection."""
-        super().__init__(Path("busybox"), self.BUSYBOX_PATH, None)
+        super().__init__(self.BUSYBOX_PATH)
 
     def install(self: BusyboxInjection, environment: Environment) -> None:
         """Install the injection into an environment."""

python/binharness/common/qemu.py

@@ -31,9 +31,7 @@ class QemuInjection(ExecutableInjection):
     def __init__(self: QemuInjection, arch: str | None = None) -> None:
         """Create a QemuInjection."""
         self.arch = arch if arch is not None else _get_qemu_host_arch()
-        super().__init__(
-            Path(f"qemu-{self.arch}-static"), Path(f"/usr/bin/qemu-{self.arch}-static")
-        )
+        super().__init__(Path(f"/usr/bin/qemu-{self.arch}-static"))
 
     def run_with_log(
         self: QemuInjection,

python/binharness/types/injection.py

@@ -51,9 +51,7 @@ def install(self: Injection, environment: Environment) -> None:
                 f"{self.host_path.name}-{generate_random_suffix()}.bh-inj"
             )
 
-        environment.inject_files(
-            [(self.host_path, self.env_path / self.host_path.name)]
-        )
+        environment.inject_files([(self.host_path, self.env_path)])
         self._environment = environment
 
     def is_installed(self: Injection) -> bool:
@@ -76,17 +74,26 @@ class ExecutableInjection(Injection):
     environment.
     """
 
-    executable: Path
+    _executable: Path | None
 
     def __init__(
         self: ExecutableInjection,
-        executable: Path,
         host_path: Path,
         env_path: Path | None = None,
+        executable: Path | None = None,
     ) -> None:
         """Create an ExecutableInjection."""
         super().__init__(host_path, env_path)
-        self.executable = executable
+        self._executable = executable
+
+    @property
+    def executable(self: ExecutableInjection) -> Path:
+        """Return the executable path."""
+        if self.host_path is not None:
+            if self._executable is None:
+                return self.host_path
+            return self.host_path / self._executable
+        raise InjectionNotInstalledError
 
     def run(
         self: ExecutableInjection,
@@ -98,7 +105,7 @@ def run(
         if self._environment is None or self.env_path is None:
             raise InjectionNotInstalledError
         return self._environment.run_command(
-            [self.env_path / self.executable, *args],
+            [self.executable, *args],
             env=env,
             cwd=cwd,
         )

python/tests/test_inject.py

@@ -16,20 +16,19 @@
 @pytest.mark.linux()
 def test_inject_true() -> None:
     env = LocalEnvironment()
-    true_injection = Injection(Path("/usr/bin/true"), None)
+    true_injection = Injection(Path("/usr/bin/true"))
     true_injection.install(env)
     assert true_injection.env_path is not None
-    assert (true_injection.env_path / "true").is_file()
+    assert true_injection.env_path.is_file()
 
 
 @pytest.mark.linux()
 def test_inject_true_executable() -> None:
     env = LocalEnvironment()
-    true_injection = ExecutableInjection(Path("true"), Path("/usr/bin/true"))
+    true_injection = ExecutableInjection(Path("/usr/bin/true"))
     true_injection.install(env)
     assert true_injection.env_path is not None
-    assert true_injection.env_path.is_dir()
-    assert (true_injection.env_path / "true").is_file()
+    assert true_injection.env_path.is_file()
     assert true_injection.is_installed()
     assert true_injection.env_path.stat().st_mode & 0o111 != 0
     assert true_injection.run().wait() == 0
@@ -38,7 +37,7 @@ def test_inject_true_executable() -> None:
 @pytest.mark.linux()
 def test_inject_true_executable_twice() -> None:
     env = LocalEnvironment()
-    true_injection = ExecutableInjection(Path("true"), Path("/usr/bin/true"))
+    true_injection = ExecutableInjection(Path("/usr/bin/true"))
     true_injection.install(env)
     with pytest.raises(InjectionAlreadyInstalledError):
         true_injection.install(env)
@@ -47,13 +46,13 @@ def test_inject_true_executable_twice() -> None:
 @pytest.mark.linux()
 def test_inject_two_true_executables() -> None:
     env = LocalEnvironment()
-    true_injection_1 = ExecutableInjection(Path("true"), Path("/usr/bin/true"))
+    true_injection_1 = ExecutableInjection(Path("/usr/bin/true"))
     true_injection_1.install(env)
-    true_injection_2 = ExecutableInjection(Path("true"), Path("/usr/bin/true"))
+    true_injection_2 = ExecutableInjection(Path("/usr/bin/true"))
     true_injection_2.install(env)
 
 
 def test_executable_injection_no_install() -> None:
-    true_injection = ExecutableInjection(Path("true"), Path("/usr/bin/true"))
+    true_injection = ExecutableInjection(Path("/usr/bin/true"))
     with pytest.raises(InjectionNotInstalledError):
         true_injection.run()