From 46abb8a5563dd5be44dadd008fbef91235f3dc28 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Thu, 27 Jan 2022 19:46:06 +0300
Subject: [PATCH 01/13] Add --no-deps per line

---
 src/pip/_internal/cli/req_command.py                  |  2 ++
 src/pip/_internal/req/constructors.py                 | 11 +++++++++++
 src/pip/_internal/req/req_file.py                     |  3 +++
 src/pip/_internal/req/req_install.py                  |  2 ++
 src/pip/_internal/resolution/resolvelib/candidates.py |  2 ++
 src/pip/_internal/resolution/resolvelib/provider.py   |  6 +++++-
 6 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/pip/_internal/cli/req_command.py b/src/pip/_internal/cli/req_command.py
index 5d4d1f0f45b..bcbc94db21a 100644
--- a/src/pip/_internal/cli/req_command.py
+++ b/src/pip/_internal/cli/req_command.py
@@ -345,6 +345,7 @@ def make_resolver(
         """
         make_install_req = partial(
             install_req_from_req_string,
+            ignore_dependencies=options.ignore_dependencies,
             isolated=options.isolated_mode,
             use_pep517=use_pep517,
         )
@@ -419,6 +420,7 @@ def get_requirements(
                 isolated=options.isolated_mode,
                 use_pep517=options.use_pep517,
                 user_supplied=True,
+                ignore_dependencies=options.ignore_dependencies,
             )
             requirements.append(req_to_add)
 
diff --git a/src/pip/_internal/req/constructors.py b/src/pip/_internal/req/constructors.py
index 25bfb391d88..4756d660f8c 100644
--- a/src/pip/_internal/req/constructors.py
+++ b/src/pip/_internal/req/constructors.py
@@ -224,6 +224,9 @@ def install_req_from_editable(
         install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
+        ignore_dependencies=options.get("ignore_dependencies", False)
+        if options
+        else False,
         extras=parts.extras,
     )
 
@@ -380,6 +383,7 @@ def install_req_from_line(
     constraint: bool = False,
     line_source: Optional[str] = None,
     user_supplied: bool = False,
+    ignore_dependencies: bool = False,
 ) -> InstallRequirement:
     """Creates an InstallRequirement from a name, which might be a
     requirement, directory containing 'setup.py', filename, or URL.
@@ -399,6 +403,9 @@ def install_req_from_line(
         install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
+        ignore_dependencies=options.get("ignore_dependencies", False)
+        if options
+        else ignore_dependencies,
         constraint=constraint,
         extras=parts.extras,
         user_supplied=user_supplied,
@@ -409,6 +416,7 @@ def install_req_from_req_string(
     req_string: str,
     comes_from: Optional[InstallRequirement] = None,
     isolated: bool = False,
+    ignore_dependencies: bool = False,
     use_pep517: Optional[bool] = None,
     user_supplied: bool = False,
 ) -> InstallRequirement:
@@ -438,6 +446,7 @@ def install_req_from_req_string(
         req,
         comes_from,
         isolated=isolated,
+        ignore_dependencies=ignore_dependencies,
         use_pep517=use_pep517,
         user_supplied=user_supplied,
     )
@@ -456,6 +465,7 @@ def install_req_from_parsed_requirement(
             use_pep517=use_pep517,
             constraint=parsed_req.constraint,
             isolated=isolated,
+            options=parsed_req.options,
             user_supplied=user_supplied,
         )
 
@@ -486,5 +496,6 @@ def install_req_from_link_and_ireq(
         isolated=ireq.isolated,
         install_options=ireq.install_options,
         global_options=ireq.global_options,
+        ignore_dependencies=ireq.ignore_dependencies,
         hash_options=ireq.hash_options,
     )
diff --git a/src/pip/_internal/req/req_file.py b/src/pip/_internal/req/req_file.py
index 03ae50492c5..582c8b0513d 100644
--- a/src/pip/_internal/req/req_file.py
+++ b/src/pip/_internal/req/req_file.py
@@ -72,6 +72,7 @@
     cmdoptions.install_options,
     cmdoptions.global_options,
     cmdoptions.hash,
+    cmdoptions.no_deps,
 ]
 
 # the 'dest' string values
@@ -189,6 +190,8 @@ def handle_requirement_line(
         if options:
             # Disable wheels if the user has specified build options
             cmdoptions.check_install_build_global(options, line.opts)
+            if line.opts.ignore_dependencies:
+                options.ignore_dependencies = True
 
         # get the options that apply to requirements
         req_options = {}
diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index 637b6ce10af..acf9045847b 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -80,6 +80,7 @@ def __init__(
         install_options: Optional[List[str]] = None,
         global_options: Optional[List[str]] = None,
         hash_options: Optional[Dict[str, List[str]]] = None,
+        ignore_dependencies: bool = False,
         constraint: bool = False,
         extras: Collection[str] = (),
         user_supplied: bool = False,
@@ -138,6 +139,7 @@ def __init__(
         self.install_options = install_options if install_options else []
         self.global_options = global_options if global_options else []
         self.hash_options = hash_options if hash_options else {}
+        self.ignore_dependencies = ignore_dependencies
         # Set to True after successful preparation of this requirement
         self.prepared = False
         # User supplied requirement are explicitly requested for installation
diff --git a/src/pip/_internal/resolution/resolvelib/candidates.py b/src/pip/_internal/resolution/resolvelib/candidates.py
index 9b8450e86b8..83dbc09695f 100644
--- a/src/pip/_internal/resolution/resolvelib/candidates.py
+++ b/src/pip/_internal/resolution/resolvelib/candidates.py
@@ -68,6 +68,7 @@ def make_install_req_from_link(
             install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
+            ignore_dependencies=template.ignore_dependencies,
         ),
     )
     ireq.original_link = template.original_link
@@ -91,6 +92,7 @@ def make_install_req_from_editable(
             install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
+            ignore_dependencies=template.ignore_dependencies,
         ),
     )
 
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index e6ec9594f62..7725d512b0a 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -233,7 +233,11 @@ def is_satisfied_by(self, requirement: Requirement, candidate: Candidate) -> boo
         return requirement.is_satisfied_by(candidate)
 
     def get_dependencies(self, candidate: Candidate) -> Sequence[Requirement]:
-        with_requires = not self._ignore_dependencies
+        install_req = candidate.get_install_requirement()
+        if install_req:
+            with_requires = not install_req.ignore_dependencies
+        else:
+            with_requires = not self._ignore_dependencies
         return [r for r in candidate.iter_dependencies(with_requires) if r is not None]
 
     @staticmethod

From 9386757a24d96fa7ee2b7967e7d97ecb4286e48a Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Thu, 27 Jan 2022 19:58:18 +0300
Subject: [PATCH 02/13] Add changelog

---
 news/9948.feature.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 news/9948.feature.rst

diff --git a/news/9948.feature.rst b/news/9948.feature.rst
new file mode 100644
index 00000000000..7cf83783f0e
--- /dev/null
+++ b/news/9948.feature.rst
@@ -0,0 +1 @@
+Add a per-requirement ``--no-deps`` option.

From a8944bfed7cc201aa692f4dfaa751ccba20ff3a8 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Thu, 27 Jan 2022 22:04:37 +0300
Subject: [PATCH 03/13] Dont check packages with ignore_dependencies

---
 src/pip/_internal/operations/check.py                 | 4 +++-
 src/pip/_internal/req/constructors.py                 | 2 +-
 src/pip/_internal/req/req_file.py                     | 2 --
 src/pip/_internal/resolution/resolvelib/candidates.py | 1 +
 src/pip/_internal/resolution/resolvelib/provider.py   | 5 ++---
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/pip/_internal/operations/check.py b/src/pip/_internal/operations/check.py
index fb3ac8b9c9e..dfee2a18883 100644
--- a/src/pip/_internal/operations/check.py
+++ b/src/pip/_internal/operations/check.py
@@ -100,7 +100,9 @@ def check_install_conflicts(to_install: List[InstallRequirement]) -> ConflictDet
     # Start from the current state
     package_set, _ = create_package_set_from_installed()
     # Install packages
-    would_be_installed = _simulate_installation_of(to_install, package_set)
+    would_be_installed = _simulate_installation_of(
+        list(filter(lambda x: not x.ignore_dependencies, to_install)), package_set
+    )
 
     # Only warn about directly-dependent packages; create a whitelist of them
     whitelist = _create_whitelist(would_be_installed, package_set)
diff --git a/src/pip/_internal/req/constructors.py b/src/pip/_internal/req/constructors.py
index 4756d660f8c..449467d3f77 100644
--- a/src/pip/_internal/req/constructors.py
+++ b/src/pip/_internal/req/constructors.py
@@ -403,7 +403,7 @@ def install_req_from_line(
         install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
-        ignore_dependencies=options.get("ignore_dependencies", False)
+        ignore_dependencies=options.get("ignore_dependencies", ignore_dependencies)
         if options
         else ignore_dependencies,
         constraint=constraint,
diff --git a/src/pip/_internal/req/req_file.py b/src/pip/_internal/req/req_file.py
index 582c8b0513d..e3aabb66662 100644
--- a/src/pip/_internal/req/req_file.py
+++ b/src/pip/_internal/req/req_file.py
@@ -190,8 +190,6 @@ def handle_requirement_line(
         if options:
             # Disable wheels if the user has specified build options
             cmdoptions.check_install_build_global(options, line.opts)
-            if line.opts.ignore_dependencies:
-                options.ignore_dependencies = True
 
         # get the options that apply to requirements
         req_options = {}
diff --git a/src/pip/_internal/resolution/resolvelib/candidates.py b/src/pip/_internal/resolution/resolvelib/candidates.py
index 83dbc09695f..f96ffc5d25a 100644
--- a/src/pip/_internal/resolution/resolvelib/candidates.py
+++ b/src/pip/_internal/resolution/resolvelib/candidates.py
@@ -117,6 +117,7 @@ def _make_install_req_from_dist(
             install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
+            ignore_dependencies=template.ignore_dependencies,
         ),
     )
     ireq.satisfied_by = dist
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index 7725d512b0a..fe417b1d646 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -234,10 +234,9 @@ def is_satisfied_by(self, requirement: Requirement, candidate: Candidate) -> boo
 
     def get_dependencies(self, candidate: Candidate) -> Sequence[Requirement]:
         install_req = candidate.get_install_requirement()
-        if install_req:
+        with_requires = not self._ignore_dependencies
+        if install_req and with_requires:
             with_requires = not install_req.ignore_dependencies
-        else:
-            with_requires = not self._ignore_dependencies
         return [r for r in candidate.iter_dependencies(with_requires) if r is not None]
 
     @staticmethod

From f2f6dc5750e074df8069f7277f47cefc4fdb729e Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Fri, 28 Jan 2022 14:30:43 +0300
Subject: [PATCH 04/13] Get ireq from AlreadyInstalledCandidate

---
 .../_internal/resolution/resolvelib/provider.py   | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index fe417b1d646..b0302473819 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -13,8 +13,10 @@
 
 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
+from .candidates import REQUIRES_PYTHON_IDENTIFIER, AlreadyInstalledCandidate
 from .factory import Factory
 
 if TYPE_CHECKING:
@@ -233,10 +235,15 @@ def is_satisfied_by(self, requirement: Requirement, candidate: Candidate) -> boo
         return requirement.is_satisfied_by(candidate)
 
     def get_dependencies(self, candidate: Candidate) -> Sequence[Requirement]:
-        install_req = candidate.get_install_requirement()
+        ireq = candidate.get_install_requirement()
         with_requires = not self._ignore_dependencies
-        if install_req and with_requires:
-            with_requires = not install_req.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
         return [r for r in candidate.iter_dependencies(with_requires) if r is not None]
 
     @staticmethod

From 73435777cd7ac13c4e94ceb196bb0289af217861 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Wed, 23 Mar 2022 10:34:44 +0300
Subject: [PATCH 05/13] Refactor and test

---
 src/pip/_internal/req/req_install.py          |  7 +++++++
 .../resolution/resolvelib/candidates.py       | 10 ++++++++++
 .../resolution/resolvelib/provider.py         | 16 ++++-----------
 tests/functional/test_install_reqs.py         | 20 +++++++++++++++++++
 4 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index acf9045847b..52c8deb1952 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/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.
diff --git a/src/pip/_internal/resolution/resolvelib/candidates.py b/src/pip/_internal/resolution/resolvelib/candidates.py
index f96ffc5d25a..40cb7a80337 100644
--- a/src/pip/_internal/resolution/resolvelib/candidates.py
+++ b/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 = (
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index b0302473819..a52f54a1c6e 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/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
diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index a7f2f46be94..943c8a25b33 100644
--- a/tests/functional/test_install_reqs.py
+++ b/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")

From ea90aeb1db09ead43890d84d189ef162fe0fbcad Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Wed, 23 Mar 2022 11:16:10 +0300
Subject: [PATCH 06/13] Remove unused arg

---
 src/pip/_internal/cli/req_command.py  | 1 -
 src/pip/_internal/req/constructors.py | 5 ++---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/pip/_internal/cli/req_command.py b/src/pip/_internal/cli/req_command.py
index bcbc94db21a..acf962d26ae 100644
--- a/src/pip/_internal/cli/req_command.py
+++ b/src/pip/_internal/cli/req_command.py
@@ -420,7 +420,6 @@ def get_requirements(
                 isolated=options.isolated_mode,
                 use_pep517=options.use_pep517,
                 user_supplied=True,
-                ignore_dependencies=options.ignore_dependencies,
             )
             requirements.append(req_to_add)
 
diff --git a/src/pip/_internal/req/constructors.py b/src/pip/_internal/req/constructors.py
index 449467d3f77..706a79f4788 100644
--- a/src/pip/_internal/req/constructors.py
+++ b/src/pip/_internal/req/constructors.py
@@ -383,7 +383,6 @@ def install_req_from_line(
     constraint: bool = False,
     line_source: Optional[str] = None,
     user_supplied: bool = False,
-    ignore_dependencies: bool = False,
 ) -> InstallRequirement:
     """Creates an InstallRequirement from a name, which might be a
     requirement, directory containing 'setup.py', filename, or URL.
@@ -403,9 +402,9 @@ def install_req_from_line(
         install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
-        ignore_dependencies=options.get("ignore_dependencies", ignore_dependencies)
+        ignore_dependencies=options.get("ignore_dependencies", False)
         if options
-        else ignore_dependencies,
+        else False,
         constraint=constraint,
         extras=parts.extras,
         user_supplied=user_supplied,

From 64ec9d0ae2a7ee2bfe24930478c5da13906be575 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Fri, 25 Mar 2022 12:15:55 +0300
Subject: [PATCH 07/13] Refactor

---
 src/pip/_internal/operations/check.py         |  2 +-
 src/pip/_internal/req/req_install.py          |  9 ++------
 .../_internal/resolution/resolvelib/base.py   |  4 ++++
 .../resolution/resolvelib/candidates.py       | 23 +++++++++++--------
 .../resolution/resolvelib/provider.py         |  6 ++---
 tests/functional/test_install_reqs.py         |  9 +++++---
 6 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/src/pip/_internal/operations/check.py b/src/pip/_internal/operations/check.py
index dfee2a18883..ecfa51b1b85 100644
--- a/src/pip/_internal/operations/check.py
+++ b/src/pip/_internal/operations/check.py
@@ -101,7 +101,7 @@ def check_install_conflicts(to_install: List[InstallRequirement]) -> ConflictDet
     package_set, _ = create_package_set_from_installed()
     # Install packages
     would_be_installed = _simulate_installation_of(
-        list(filter(lambda x: not x.ignore_dependencies, to_install)), package_set
+        [x for x in to_install if not x.ignore_dependencies], package_set
     )
 
     # Only warn about directly-dependent packages; create a whitelist of them
diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index 52c8deb1952..4d77ebbde29 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -140,6 +140,8 @@ def __init__(
         self.global_options = global_options if global_options else []
         self.hash_options = hash_options if hash_options else {}
         self.ignore_dependencies = ignore_dependencies
+        if isinstance(self.comes_from, InstallRequirement):
+            self.ignore_dependencies = self.comes_from.ignore_dependencies
         # Set to True after successful preparation of this requirement
         self.prepared = False
         # User supplied requirement are explicitly requested for installation
@@ -254,13 +256,6 @@ 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.
diff --git a/src/pip/_internal/resolution/resolvelib/base.py b/src/pip/_internal/resolution/resolvelib/base.py
index b206692a0a9..17938f475dd 100644
--- a/src/pip/_internal/resolution/resolvelib/base.py
+++ b/src/pip/_internal/resolution/resolvelib/base.py
@@ -131,6 +131,10 @@ def is_editable(self) -> bool:
     def source_link(self) -> Optional[Link]:
         raise NotImplementedError("Override in subclass")
 
+    @property
+    def ignore_dependencies(self) -> bool:
+        raise NotImplementedError("Override in subclass")
+
     def iter_dependencies(self, with_requires: bool) -> Iterable[Optional[Requirement]]:
         raise NotImplementedError("Override in subclass")
 
diff --git a/src/pip/_internal/resolution/resolvelib/candidates.py b/src/pip/_internal/resolution/resolvelib/candidates.py
index 40cb7a80337..d49da31ccf6 100644
--- a/src/pip/_internal/resolution/resolvelib/candidates.py
+++ b/src/pip/_internal/resolution/resolvelib/candidates.py
@@ -37,16 +37,6 @@
 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 = (
@@ -252,6 +242,10 @@ def _prepare(self) -> BaseDistribution:
         self._check_metadata_consistency(dist)
         return dist
 
+    @property
+    def ignore_dependencies(self) -> bool:
+        return self._ireq.ignore_dependencies
+
     def iter_dependencies(self, with_requires: bool) -> Iterable[Optional[Requirement]]:
         requires = self.dist.iter_dependencies() if with_requires else ()
         for r in requires:
@@ -390,6 +384,10 @@ def version(self) -> CandidateVersion:
     def is_editable(self) -> bool:
         return self.dist.editable
 
+    @property
+    def ignore_dependencies(self) -> bool:
+        return self._ireq.ignore_dependencies
+
     def format_for_error(self) -> str:
         return f"{self.name} {self.version} (Installed)"
 
@@ -485,6 +483,10 @@ def is_editable(self) -> bool:
     def source_link(self) -> Optional[Link]:
         return self.base.source_link
 
+    @property
+    def ignore_dependencies(self) -> bool:
+        return self.base.ignore_dependencies
+
     def iter_dependencies(self, with_requires: bool) -> Iterable[Optional[Requirement]]:
         factory = self.base._factory
 
@@ -523,6 +525,7 @@ def get_install_requirement(self) -> Optional[InstallRequirement]:
 class RequiresPythonCandidate(Candidate):
     is_installed = False
     source_link = None
+    ignore_dependencies = False
 
     def __init__(self, py_version_info: Optional[Tuple[int, ...]]) -> None:
         if py_version_info is not None:
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index a52f54a1c6e..66d7a3da1fe 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -14,7 +14,7 @@
 from pip._vendor.resolvelib.providers import AbstractProvider
 
 from .base import Candidate, Constraint, Requirement
-from .candidates import REQUIRES_PYTHON_IDENTIFIER, has_ignore_dependencies
+from .candidates import REQUIRES_PYTHON_IDENTIFIER
 from .factory import Factory
 
 if TYPE_CHECKING:
@@ -233,9 +233,7 @@ def is_satisfied_by(self, requirement: Requirement, candidate: Candidate) -> boo
         return requirement.is_satisfied_by(candidate)
 
     def get_dependencies(self, candidate: Candidate) -> Sequence[Requirement]:
-        with_requires = not (
-            self._ignore_dependencies or has_ignore_dependencies(candidate)
-        )
+        with_requires = not (self._ignore_dependencies or candidate.ignore_dependencies)
         return [r for r in candidate.iter_dependencies(with_requires) if r is not None]
 
     @staticmethod
diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index 943c8a25b33..f4f89360fa5 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -819,11 +819,14 @@ def test_location_related_install_option_fails(script: PipTestEnvironment) -> No
 
 
 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, "A", "0.1.0", depends=["B==0.1.0"], extras={"C": ["C"]}
+    )
     create_basic_wheel_for_package(script, "B", "0.1.0")
+    create_basic_wheel_for_package(script, "C", "0.1.0")
 
     requirements_txt = script.scratch_path / "requirements.txt"
-    requirements_txt.write_text("A --no-deps")
+    requirements_txt.write_text("A[C] --no-deps")
 
     script.pip(
         "install",
@@ -835,4 +838,4 @@ def test_install_options_no_deps(script: PipTestEnvironment) -> None:
         "--only-binary=:all:",
     )
     script.assert_installed(A="0.1.0")
-    script.assert_not_installed("B")
+    script.assert_not_installed("B", "C")

From 003749cbc0346944bfcb12b20840629fa2f1a65f Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Fri, 25 Mar 2022 12:28:31 +0300
Subject: [PATCH 08/13] Test AlreadyInstalledCandidate

---
 tests/functional/test_install_reqs.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index f4f89360fa5..a6b0d1bef92 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -839,3 +839,15 @@ def test_install_options_no_deps(script: PipTestEnvironment) -> None:
     )
     script.assert_installed(A="0.1.0")
     script.assert_not_installed("B", "C")
+
+    # AlreadyInstalledCandidate should not install dependencies
+    script.pip(
+        "install",
+        "--no-cache-dir",
+        "--find-links",
+        script.scratch_path,
+        "-r",
+        requirements_txt,
+        "--only-binary=:all:",
+    )
+    script.assert_not_installed("B", "C")

From 094dd68ca51589c0c3095effae102d596b6e78e9 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Fri, 25 Mar 2022 15:28:23 +0300
Subject: [PATCH 09/13] Update news/9948.feature.rst

Co-authored-by: Tzu-ping Chung <uranusjr@gmail.com>
---
 news/9948.feature.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/news/9948.feature.rst b/news/9948.feature.rst
index 7cf83783f0e..643181f7a75 100644
--- a/news/9948.feature.rst
+++ b/news/9948.feature.rst
@@ -1 +1 @@
-Add a per-requirement ``--no-deps`` option.
+Add per-requirement ``--no-deps`` option support in requirements.txt.

From 065b50a055ac0d3157fa6ef21bdac24c03736aca Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Fri, 25 Mar 2022 16:26:20 +0300
Subject: [PATCH 10/13] Dont warn about conflicts

---
 src/pip/_internal/commands/install.py | 6 +++++-
 src/pip/_internal/req/req_install.py  | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/pip/_internal/commands/install.py b/src/pip/_internal/commands/install.py
index 34e4c2f84c8..a35a13f959c 100644
--- a/src/pip/_internal/commands/install.py
+++ b/src/pip/_internal/commands/install.py
@@ -391,7 +391,11 @@ def run(self, options: Values, args: List[str]) -> int:
             # Check for conflicts in the package set we're installing.
             conflicts: Optional[ConflictDetails] = None
             should_warn_about_conflicts = (
-                not options.ignore_dependencies and options.warn_about_conflicts
+                not (
+                    options.ignore_dependencies
+                    or any((i for i in to_install if i.ignore_dependencies))
+                )
+                and options.warn_about_conflicts
             )
             if should_warn_about_conflicts:
                 conflicts = self._determine_conflicts(to_install)
diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index 4d77ebbde29..0e6f6fbce67 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -141,7 +141,7 @@ def __init__(
         self.hash_options = hash_options if hash_options else {}
         self.ignore_dependencies = ignore_dependencies
         if isinstance(self.comes_from, InstallRequirement):
-            self.ignore_dependencies = self.comes_from.ignore_dependencies
+            self.ignore_dependencies |= self.comes_from.ignore_dependencies
         # Set to True after successful preparation of this requirement
         self.prepared = False
         # User supplied requirement are explicitly requested for installation

From 5f5a9f920c47c4c75235b139e71a23664159c562 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Sat, 26 Mar 2022 13:12:56 +0300
Subject: [PATCH 11/13] Refactor

---
 src/pip/_internal/req/req_install.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index 0e6f6fbce67..21aebd02c87 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -140,8 +140,11 @@ def __init__(
         self.global_options = global_options if global_options else []
         self.hash_options = hash_options if hash_options else {}
         self.ignore_dependencies = ignore_dependencies
-        if isinstance(self.comes_from, InstallRequirement):
-            self.ignore_dependencies |= self.comes_from.ignore_dependencies
+        if (
+            isinstance(comes_from, InstallRequirement)
+            and comes_from.ignore_dependencies
+        ):
+            self.ignore_dependencies = True
         # Set to True after successful preparation of this requirement
         self.prepared = False
         # User supplied requirement are explicitly requested for installation

From ccf3d95af4f086a76ca96c3a29c540bb1ef1882f Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Mon, 19 Jun 2023 17:46:55 +0300
Subject: [PATCH 12/13] Raise exception if the legacy resolver is used

---
 src/pip/_internal/req/req_file.py     |  8 ++++++++
 tests/functional/test_install_reqs.py | 24 ++++++++++++++++++------
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/pip/_internal/req/req_file.py b/src/pip/_internal/req/req_file.py
index 19b89530dee..705f04a4e85 100644
--- a/src/pip/_internal/req/req_file.py
+++ b/src/pip/_internal/req/req_file.py
@@ -193,6 +193,14 @@ def handle_requirement_line(
         req_options = {}
         for dest in SUPPORTED_OPTIONS_REQ_DEST:
             if dest in line.opts.__dict__ and line.opts.__dict__[dest]:
+                if (
+                    dest == "ignore_dependencies"
+                    and options
+                    and "legacy-resolver" in options.deprecated_features_enabled
+                ):
+                    raise RequirementsFileParseError(
+                        "Cannot ignore dependencies with legacy resolver"
+                    )
                 req_options[dest] = line.opts.__dict__[dest]
 
         line_source = f"line {line.lineno} of {line.filename}"
diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index 8c421c9bd9b..a7b30e59bff 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -819,7 +819,9 @@ def test_config_settings_local_to_package(
     assert "--verbose" not in simple2_args
 
 
-def test_install_options_no_deps(script: PipTestEnvironment) -> None:
+def test_install_options_no_deps(
+    script: PipTestEnvironment, resolver_variant: ResolverVariant
+) -> None:
     create_basic_wheel_for_package(
         script, "A", "0.1.0", depends=["B==0.1.0"], extras={"C": ["C"]}
     )
@@ -829,7 +831,7 @@ def test_install_options_no_deps(script: PipTestEnvironment) -> None:
     requirements_txt = script.scratch_path / "requirements.txt"
     requirements_txt.write_text("A[C] --no-deps")
 
-    script.pip(
+    result = script.pip(
         "install",
         "--no-cache-dir",
         "--find-links",
@@ -837,12 +839,17 @@ def test_install_options_no_deps(script: PipTestEnvironment) -> None:
         "-r",
         requirements_txt,
         "--only-binary=:all:",
+        expect_error=(resolver_variant == "legacy"),
+        allow_stderr_warning=True,
     )
-    script.assert_installed(A="0.1.0")
-    script.assert_not_installed("B", "C")
+    if resolver_variant == "legacy":
+        assert "Cannot ignore dependencies with legacy resolver" in result.stderr
+    else:
+        script.assert_installed(A="0.1.0")
+        script.assert_not_installed("B", "C")
 
     # AlreadyInstalledCandidate should not install dependencies
-    script.pip(
+    result = script.pip(
         "install",
         "--no-cache-dir",
         "--find-links",
@@ -850,5 +857,10 @@ def test_install_options_no_deps(script: PipTestEnvironment) -> None:
         "-r",
         requirements_txt,
         "--only-binary=:all:",
+        expect_error=(resolver_variant == "legacy"),
+        allow_stderr_warning=True,
     )
-    script.assert_not_installed("B", "C")
+    if resolver_variant == "legacy":
+        assert "Cannot ignore dependencies with legacy resolver" in result.stderr
+    else:
+        script.assert_not_installed("B", "C")

From 61ab8fbffec23d1e3d2ca6d2b97eb247b0fc2316 Mon Sep 17 00:00:00 2001
From: q0w <43147888+q0w@users.noreply.github.com>
Date: Mon, 17 Jul 2023 14:02:23 +0300
Subject: [PATCH 13/13] Test deps without no-deps flag

---
 tests/functional/test_install_reqs.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index a7b30e59bff..474da1864a3 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -827,9 +827,11 @@ def test_install_options_no_deps(
     )
     create_basic_wheel_for_package(script, "B", "0.1.0")
     create_basic_wheel_for_package(script, "C", "0.1.0")
+    create_basic_wheel_for_package(script, "D", "0.1.0", depends=["E==0.1.0"])
+    create_basic_wheel_for_package(script, "E", "0.1.0")
 
     requirements_txt = script.scratch_path / "requirements.txt"
-    requirements_txt.write_text("A[C] --no-deps")
+    requirements_txt.write_text("A[C] --no-deps\nD")
 
     result = script.pip(
         "install",
@@ -845,7 +847,7 @@ def test_install_options_no_deps(
     if resolver_variant == "legacy":
         assert "Cannot ignore dependencies with legacy resolver" in result.stderr
     else:
-        script.assert_installed(A="0.1.0")
+        script.assert_installed(A="0.1.0", D="0.1.0", E="0.1.0")
         script.assert_not_installed("B", "C")
 
     # AlreadyInstalledCandidate should not install dependencies
@@ -863,4 +865,5 @@ def test_install_options_no_deps(
     if resolver_variant == "legacy":
         assert "Cannot ignore dependencies with legacy resolver" in result.stderr
     else:
+        script.assert_installed(A="0.1.0", D="0.1.0", E="0.1.0")
         script.assert_not_installed("B", "C")