Refactor and test

src/pip/_internal/req/req_install.py

@@ -254,6 +254,13 @@ def match_markers(self, extras_requested: Optional[Iterable[str]] = None) -> boo
         else:
             return True
 
+    @property
+    def has_ignore_dependencies(self) -> bool:
+        if isinstance(self.comes_from, InstallRequirement):
+            return self.comes_from.ignore_dependencies
+        else:
+            return self.ignore_dependencies
+
     @property
     def has_hash_options(self) -> bool:
         """Return whether any known-good hashes are specified as options.

src/pip/_internal/resolution/resolvelib/candidates.py

@@ -37,6 +37,16 @@
 REQUIRES_PYTHON_IDENTIFIER = cast(NormalizedName, "<Python from Requires-Python>")
 
 
+def has_ignore_dependencies(candidate: Candidate) -> bool:
+    ireq = candidate.get_install_requirement()
+    if ireq:
+        return ireq.has_ignore_dependencies
+    elif isinstance(candidate, AlreadyInstalledCandidate):
+        return candidate._ireq.has_ignore_dependencies
+    else:
+        return False
+
+
 def as_base_candidate(candidate: Candidate) -> Optional[BaseCandidate]:
     """The runtime version of BaseCandidate."""
     base_candidate_classes = (

src/pip/_internal/resolution/resolvelib/provider.py

@@ -13,10 +13,8 @@
 
 from pip._vendor.resolvelib.providers import AbstractProvider
 
-from pip._internal.req import InstallRequirement
-
 from .base import Candidate, Constraint, Requirement
-from .candidates import REQUIRES_PYTHON_IDENTIFIER, AlreadyInstalledCandidate
+from .candidates import REQUIRES_PYTHON_IDENTIFIER, has_ignore_dependencies
 from .factory import Factory
 
 if TYPE_CHECKING:
@@ -235,15 +233,9 @@ def is_satisfied_by(self, requirement: Requirement, candidate: Candidate) -> boo
         return requirement.is_satisfied_by(candidate)
 
     def get_dependencies(self, candidate: Candidate) -> Sequence[Requirement]:
-        ireq = candidate.get_install_requirement()
-        with_requires = not self._ignore_dependencies
-        if ireq and with_requires:
-            if ireq.comes_from and isinstance(ireq.comes_from, InstallRequirement):
-                with_requires = not ireq.comes_from.ignore_dependencies
-            else:
-                with_requires = not ireq.ignore_dependencies
-        elif isinstance(candidate, AlreadyInstalledCandidate):
-            with_requires = not candidate._ireq.ignore_dependencies
+        with_requires = not (
+            self._ignore_dependencies or has_ignore_dependencies(candidate)
+        )
         return [r for r in candidate.iter_dependencies(with_requires) if r is not None]
 
     @staticmethod

tests/functional/test_install_reqs.py

@@ -816,3 +816,23 @@ def test_location_related_install_option_fails(script: PipTestEnvironment) -> No
         expect_error=True,
     )
     assert "['--home'] from simple" in result.stderr
+
+
+def test_install_options_no_deps(script: PipTestEnvironment) -> None:
+    create_basic_wheel_for_package(script, "A", "0.1.0", depends=["B==0.1.0"])
+    create_basic_wheel_for_package(script, "B", "0.1.0")
+
+    requirements_txt = script.scratch_path / "requirements.txt"
+    requirements_txt.write_text("A --no-deps")
+
+    script.pip(
+        "install",
+        "--no-cache-dir",
+        "--find-links",
+        script.scratch_path,
+        "-r",
+        requirements_txt,
+        "--only-binary=:all:",
+    )
+    script.assert_installed(A="0.1.0")
+    script.assert_not_installed("B")