Implement conf that avoids binary skipping in the graph

conan/cli/commands/create.py

@@ -22,7 +22,7 @@ def create(conan_api, parser, *args):
     add_common_install_arguments(parser)
     parser.add_argument("--build-require", action='store_true', default=False,
                         help='Whether the package being created is a build-require (to be used'
-                             'as tool_requires() by other packages)')
+                             ' as tool_requires() by other packages)')
     parser.add_argument("-tf", "--test-folder", action=OnceArgument,
                         help='Alternative test folder name. By default it is "test_package". '
                              'Use "" to skip the test stage')

conans/client/graph/graph_binaries.py

@@ -360,5 +360,5 @@ def _skip_binaries(graph):
                     required_nodes.add(dep_node)
 
         for node in graph.nodes:
-            if node not in required_nodes:
+            if node not in required_nodes and node.conanfile.conf.get("tools.graph:skip_binaries", check_type=bool, default=True):
                 node.binary = BINARY_SKIP

conans/model/conf.py

@@ -70,6 +70,7 @@
     "tools.files.download:retry": "Number of retries in case of failure when downloading",
     "tools.files.download:retry_wait": "Seconds to wait between download attempts",
     "tools.files.download:verify": "If set, overrides recipes on whether to perform SSL verification for their downloaded files. Only recommended to be set while testing",
+    "tools.graph:skip_binaries": "Allow the graph to skip binaries not needed in the current configuration (True by default)",
     "tools.gnu:make_program": "Indicate path to make program",
     "tools.gnu:define_libcxx11_abi": "Force definition of GLIBCXX_USE_CXX11_ABI=1 for libstdc++11",
     "tools.gnu:pkg_config": "Path to pkg-config executable used by PkgConfig build helper",

conans/test/integration/graph/test_skip_binaries.py

@@ -118,3 +118,32 @@ def test_list_skip_printing():
     c.run("install app --build=missing")
     c.assert_listed_binary({"tool/0.1": ("da39a3ee5e6b4b0d3255bfef95601890afd80709", "Cache")},
                            build=True)
+
+
+def test_conf_skip():
+    client = TestClient()
+    client.save({"conanfile.py": GenConanfile()})
+    client.run("create . --name=maths --version=1.0")
+    client.run("create . --name=ai --version=1.0")
+
+    client.save({"conanfile.py": GenConanfile().with_requirement("maths/1.0", visible=False)})
+    client.run("create . --name=liba --version=1.0")
+    client.save({"conanfile.py": GenConanfile().with_requirement("ai/1.0", visible=False)})
+    client.run("create . --name=libb --version=1.0")
+
+    client.save({"conanfile.py": GenConanfile().with_requires("liba/1.0", "libb/1.0")})
+    client.run("create . --name=app --version=0.0 -v")
+    client.assert_listed_binary({"maths/1.0": (NO_SETTINGS_PACKAGE_ID, "Skip")})
+    client.assert_listed_binary({"ai/1.0": (NO_SETTINGS_PACKAGE_ID, "Skip")})
+
+    client.run("create . --name=app --version=1.0 -v -c *:tools.graph:skip_binaries=False")
+    client.assert_listed_binary({"maths/1.0": (NO_SETTINGS_PACKAGE_ID, "Cache")})
+    client.assert_listed_binary({"ai/1.0": (NO_SETTINGS_PACKAGE_ID, "Cache")})
+
+    client.run("create . --name=app --version=2.0 -v -c maths/*:tools.graph:skip_binaries=False")
+    client.assert_listed_binary({"maths/1.0": (NO_SETTINGS_PACKAGE_ID, "Cache")})
+    client.assert_listed_binary({"ai/1.0": (NO_SETTINGS_PACKAGE_ID, "Skip")})
+
+    client.run("create . --name=app --version=3.0 -v -c *:tools.graph:skip_binaries=True")
+    client.assert_listed_binary({"maths/1.0": (NO_SETTINGS_PACKAGE_ID, "Skip")})
+    client.assert_listed_binary({"ai/1.0": (NO_SETTINGS_PACKAGE_ID, "Skip")})