[internal] Make generate-lockfiles goal generic (pantsbuild#14122)

The goal was originally hardcoded for Python. This allows us to now use it for other languages like Java.

We do this through some elaborate usage of unions + newtyping so that distinct types look the same.

Remaining TODOs:

* Re-enable ambiguity check, and check for ambiguity between user lockfiles, like Python vs. Java.
* Update `help` for the goal to be generic.

src/python/pants/backend/codegen/protobuf/python/python_protobuf_subsystem.py

@@ -4,8 +4,10 @@
 from typing import cast
 
 from pants.backend.codegen.protobuf.target_types import ProtobufDependenciesField
-from pants.backend.python.goals.lockfile import PythonLockfileRequest, PythonToolLockfileSentinel
+from pants.backend.python.goals import lockfile
+from pants.backend.python.goals.lockfile import PythonLockfileRequest
 from pants.backend.python.subsystems.python_tool_base import PythonToolRequirementsBase
+from pants.core.goals.generate_lockfiles import ToolLockfileSentinel
 from pants.engine.addresses import Addresses, UnparsedAddressInputs
 from pants.engine.rules import Get, collect_rules, rule
 from pants.engine.target import InjectDependenciesRequest, InjectedDependencies
@@ -72,7 +74,7 @@ class PythonProtobufMypyPlugin(PythonToolRequirementsBase):
     default_lockfile_url = git_url(default_lockfile_path)
 
 
-class MypyProtobufLockfileSentinel(PythonToolLockfileSentinel):
+class MypyProtobufLockfileSentinel(ToolLockfileSentinel):
     options_scope = PythonProtobufMypyPlugin.options_scope
 
 
@@ -98,6 +100,7 @@ async def inject_dependencies(
 def rules():
     return [
         *collect_rules(),
+        *lockfile.rules(),
         UnionRule(InjectDependenciesRequest, InjectPythonProtobufDependencies),
-        UnionRule(PythonToolLockfileSentinel, MypyProtobufLockfileSentinel),
+        UnionRule(ToolLockfileSentinel, MypyProtobufLockfileSentinel),
     ]

src/python/pants/backend/docker/subsystems/dockerfile_parser.py

@@ -10,10 +10,12 @@
 
 from pants.backend.docker.target_types import DockerImageSourceField
 from pants.backend.docker.util_rules.docker_build_args import DockerBuildArgs
-from pants.backend.python.goals.lockfile import PythonLockfileRequest, PythonToolLockfileSentinel
+from pants.backend.python.goals import lockfile
+from pants.backend.python.goals.lockfile import PythonLockfileRequest
 from pants.backend.python.subsystems.python_tool_base import PythonToolRequirementsBase
 from pants.backend.python.target_types import EntryPoint
 from pants.backend.python.util_rules.pex import PexRequest, VenvPex, VenvPexProcess
+from pants.core.goals.generate_lockfiles import ToolLockfileSentinel
 from pants.engine.addresses import Address
 from pants.engine.fs import CreateDigest, Digest, FileContent
 from pants.engine.process import Process, ProcessResult
@@ -44,7 +46,7 @@ class DockerfileParser(PythonToolRequirementsBase):
     default_lockfile_url = git_url(default_lockfile_path)
 
 
-class DockerfileParserLockfileSentinel(PythonToolLockfileSentinel):
+class DockerfileParserLockfileSentinel(ToolLockfileSentinel):
     options_scope = DockerfileParser.options_scope
 
 
@@ -198,5 +200,6 @@ async def parse_dockerfile(request: DockerfileInfoRequest) -> DockerfileInfo:
 def rules():
     return (
         *collect_rules(),
-        UnionRule(PythonToolLockfileSentinel, DockerfileParserLockfileSentinel),
+        *lockfile.rules(),
+        UnionRule(ToolLockfileSentinel, DockerfileParserLockfileSentinel),
     )

src/python/pants/backend/experimental/python/user_lockfiles.py

@@ -5,11 +5,12 @@
 
 import logging
 
-from pants.backend.python.goals.lockfile import PythonLockfile, PythonLockfileRequest
+from pants.backend.python.goals.lockfile import PythonLockfileRequest
 from pants.backend.python.subsystems.setup import PythonSetup
 from pants.backend.python.target_types import PythonRequirementsField
 from pants.backend.python.util_rules.interpreter_constraints import InterpreterConstraints
 from pants.backend.python.util_rules.pex import PexRequirements
+from pants.core.goals.generate_lockfiles import Lockfile
 from pants.engine.addresses import Addresses
 from pants.engine.fs import Workspace
 from pants.engine.goal import Goal, GoalSubsystem
@@ -65,11 +66,11 @@ async def generate_user_lockfile_goal(
         return GenerateUserLockfileGoal(exit_code=0)
 
     result = await Get(
-        PythonLockfile,
+        Lockfile,
         PythonLockfileRequest(
-            req_strings,
+            requirements=req_strings,
             # TODO(#12314): Use interpreter constraints from the transitive closure.
-            InterpreterConstraints(python_setup.interpreter_constraints),
+            interpreter_constraints=InterpreterConstraints(python_setup.interpreter_constraints),
             resolve_name="not yet implemented",
             lockfile_dest=python_setup.lockfile,
             _description=(

src/python/pants/backend/python/goals/coverage_py.py

@@ -12,14 +12,16 @@
 
 import toml
 
-from pants.backend.python.goals.lockfile import PythonLockfileRequest, PythonToolLockfileSentinel
+from pants.backend.python.goals import lockfile
+from pants.backend.python.goals.lockfile import PythonLockfileRequest
 from pants.backend.python.subsystems.python_tool_base import PythonToolBase
 from pants.backend.python.target_types import ConsoleScript
 from pants.backend.python.util_rules.pex import PexRequest, VenvPex, VenvPexProcess
 from pants.backend.python.util_rules.python_sources import (
     PythonSourceFiles,
     PythonSourceFilesRequest,
 )
+from pants.core.goals.generate_lockfiles import ToolLockfileSentinel
 from pants.core.goals.test import (
     ConsoleCoverageReport,
     CoverageData,
@@ -234,7 +236,7 @@ def fail_under(self) -> int:
         return cast(int, self.options.fail_under)
 
 
-class CoveragePyLockfileSentinel(PythonToolLockfileSentinel):
+class CoveragePyLockfileSentinel(ToolLockfileSentinel):
     options_scope = CoverageSubsystem.options_scope
 
 
@@ -606,6 +608,7 @@ def _get_coverage_report(
 def rules():
     return [
         *collect_rules(),
+        *lockfile.rules(),
         UnionRule(CoverageDataCollection, PytestCoverageDataCollection),
-        UnionRule(PythonToolLockfileSentinel, CoveragePyLockfileSentinel),
+        UnionRule(ToolLockfileSentinel, CoveragePyLockfileSentinel),
     ]