trim_conandata()

conan/tools/files/__init__.py

@@ -7,4 +7,4 @@
 from conan.tools.files.packager import AutoPackager
 from conan.tools.files.symlinks import symlinks
 from conan.tools.files.copy_pattern import copy
-from conan.tools.files.conandata import update_conandata
+from conan.tools.files.conandata import update_conandata, trim_conandata

conan/tools/files/conandata.py

@@ -31,3 +31,31 @@ def recursive_dict_update(d, u):
     recursive_dict_update(conandata, data)
     new_content = yaml.safe_dump(conandata)
     save(path, new_content)
+
+
+def trim_conandata(conanfile):
+    """
+    Tool to modify the ``conandata.yml`` once it is exported, to limit it to the current version
+    only
+    """
+    if not hasattr(conanfile, "export_folder") or conanfile.export_folder is None:
+        raise ConanException("The 'trim_conandata()' can only be used in the 'export()' method")
+    path = os.path.join(conanfile.export_folder, "conandata.yml")
+    if not os.path.exists(path):
+        raise ConanException("conandata.yml file doesn't exist")
+
+    conandata = load(path)
+    conandata = yaml.safe_load(conandata)
+
+    version = str(conanfile.version)
+    result = {}
+    for k, v in conandata.items():
+        if not isinstance(v, dict):
+            result[k] = v
+            continue  # to allow user extra conandata, common to all versions
+        version_data = v.get(version)
+        if version_data is not None:
+            result[k] = {version: version_data}
+
+    new_conandata_yml = yaml.safe_dump(result, default_flow_style=False)
+    save(path, new_conandata_yml)

conans/test/integration/conanfile/conan_data_test.py

@@ -331,3 +331,53 @@ def export(self):
         c.save({"conanfile.py": conanfile})
         c.run("export .")  # It doesn't fail
         assert "pkg/0.1: Calling export()" in c.out
+
+
+def test_conandata_trim():
+    """ test the explict trim_conandata() helper
+    """
+    c = TestClient()
+    conanfile = textwrap.dedent("""
+        from conan import ConanFile
+        from conan.tools.files import trim_conandata
+
+        class Pkg(ConanFile):
+            name = "pkg"
+            def export(self):
+                trim_conandata(self)
+        """)
+    conandata_yml = textwrap.dedent("""\
+        sources:
+          "1.0":
+            url: "url1"
+            sha256: "sha1"
+        patches:
+          "1.0":
+            - patch_file: "patches/some_patch"
+              base_path: "source_subfolder"
+        something: else
+          """)
+    c.save({"conanfile.py": conanfile,
+            "conandata.yml": conandata_yml})
+    c.run("export . 1.0@")
+    assert "pkg/1.0: Exported revision: 70612e15e4fc9af1123fe11731ac214f" in c.out
+    conandata_yml2 = textwrap.dedent("""\
+        sources:
+         "1.0":
+           url: "url1"
+           sha256: "sha1"
+         "1.1":
+           url: "url2"
+           sha256: "sha2"
+        patches:
+         "1.1":
+           - patch_file: "patches/some_patch2"
+             base_path: "source_subfolder"
+         "1.0":
+           - patch_file: "patches/some_patch"
+             base_path: "source_subfolder"
+        something: else
+        """)
+    c.save({"conandata.yml": conandata_yml2})
+    c.run("export . 1.0@")
+    assert "pkg/1.0: Exported revision: 70612e15e4fc9af1123fe11731ac214f" in c.out