Fix scripts shebang for pip 25.2

relenv/common.py

@@ -105,7 +105,7 @@ def format_shebang(python, tpl=SHEBANG_TPL):
     """
     Return a formatted shebang.
     """
-    return tpl.format(python).strip()
+    return tpl.format(python).strip() + "\n"
 
 
 def build_arch():

tests/test_common.py

@@ -179,6 +179,10 @@ def test_shebang_tpl_macos():
     assert proc.returncode == 0
 
 
+def test_format_shebang_newline():
+    assert format_shebang("python3", SHEBANG_TPL_LINUX).endswith("\n")
+
+
 def test_relative_interpreter_default_location():
     assert relative_interpreter(
         "/tmp/relenv", "/tmp/relenv/bin", "/tmp/relenv/bin/python3"

tests/test_verify_build.py

@@ -1224,6 +1224,40 @@ def test_install_with_target_shebang(pipexec, build, minor_version):
     )
 
 
+@pytest.mark.skip_unless_on_linux
+def test_install_shebang_pip_24_2(pipexec, build, minor_version):
+    subprocess.run(
+        [str(pipexec), "install", "--upgrade", "pip==24.2"],
+        check=True,
+    )
+    subprocess.run(
+        [str(pipexec), "install", "cowsay"],
+        check=True,
+    )
+    ret = subprocess.run(
+        [str(build / "bin" / "cowsay"), "-t", "moo"],
+        check=False,
+    )
+    assert ret.returncode == 0
+
+
+@pytest.mark.skip_unless_on_linux
+def test_install_shebang_pip_25_2(pipexec, build, minor_version):
+    subprocess.run(
+        [str(pipexec), "install", "--upgrade", "pip==25.2"],
+        check=True,
+    )
+    subprocess.run(
+        [str(pipexec), "install", "cowsay"],
+        check=True,
+    )
+    ret = subprocess.run(
+        [str(build / "bin" / "cowsay"), "-t", "moo"],
+        check=False,
+    )
+    assert ret.returncode == 0
+
+
 @pytest.mark.skip_unless_on_linux
 def test_install_with_target_uninstall(pipexec, build):
     env = os.environ.copy()