[art:build-info create] Issue a warning when there are missing .tgz files

extensions/commands/art/README.md

@@ -51,6 +51,9 @@ Then upload the created package to your repository:
 conan upload ... -c -r <conan-remote>
 ```
 
+**Important**: Make sure to upload the packages _before_ creating a Build Info so conan_exports.tgz or conan_package.tgz
+files are generated. Otherwise, the created Build Info might be incomplete.
+
 Using the generated JSON files you can create a Build Info JSON file. To do this, you need to provide the build
 name and number. You will also need to indicate the artifactory server to use and the name of repository where the packages were uploaded in Artifactory (probably **not** the same one as the Conan remote name):
 

extensions/commands/art/cmd_build_info.py

@@ -277,6 +277,11 @@ def _get_remote_artifacts(artifact):
             return artifact_info
 
         artifacts, missing = _get_local_artifacts()
+        if missing:
+            tgz_items = {item for item in missing if item.endswith(".tgz") and "conan_sources.tgz" not in item}
+            if tgz_items:
+                ConanOutput().warning(f"There are missing .tgz files ({','.join(tgz_items)}). Make sure to upload the "
+                                      f"packages to Artifactory before creating a BuildInfo")
 
         if 'conan_sources.tgz' in missing:
             # check if we have the conan_sources in Artifactory, if it's not there

tests/test_build_info.py

@@ -200,3 +200,17 @@ def test_formatted_time():
     current_utc = datetime.datetime.now(datetime.timezone.utc)
     assert timestamp_utc.replace(minute=0, second=0, microsecond=0) == \
            current_utc.replace(minute=0, second=0, microsecond=0)
+
+
+def test_missing_files_warning():
+    """
+    Test that a warning is issued when .tgz files are missing from the build-info JSON
+    """
+    run("conan new header_lib -d name=lib1 -d version=1.0")
+    run("conan create . -f json > create.json")
+    graph = json.loads(load("create.json"))["graph"]
+    _fake_conan_sources(graph)
+
+    out = run("conan art:build-info create create.json build_name 1 repo --with-dependencies > bi.json")
+    assert "WARN: There are missing .tgz files (conan_export.tgz)" in out
+    assert "WARN: There are missing .tgz files (conan_package.tgz)" in out