Update summarize_release.py for initial releases (#367)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

actions/__init__.py

@@ -22,4 +22,4 @@
 #     ├── test_summarize_pr.py
 #     └── ...
 
-__version__ = "0.0.40"
+__version__ = "0.0.41"

actions/summarize_release.py

@@ -146,13 +146,15 @@ def create_github_release(repo_name: str, tag_name: str, name: str, body: str, h
 
 
 def get_previous_tag() -> str:
-    """Retrieves the previous Git tag, excluding the current tag, using the git describe command."""
-    cmd = ["git", "describe", "--tags", "--abbrev=0", "--exclude", CURRENT_TAG]
+    """Returns previous Git tag or initial commit SHA if no tags exist."""
     try:
+        # Try to get previous tag first
+        cmd = ["git", "describe", "--tags", "--abbrev=0", "--exclude", CURRENT_TAG]
         return subprocess.run(cmd, check=True, text=True, capture_output=True).stdout.strip()
     except subprocess.CalledProcessError:
-        print("Failed to get previous tag from git. Using previous commit.")
-        return "HEAD~1"
+        # If no tags exist, get the initial commit SHA
+        cmd = ["git", "rev-list", "--max-parents=0", "HEAD"]
+        return subprocess.run(cmd, check=True, text=True, capture_output=True).stdout.strip()
 
 
 def main(*args, **kwargs):
@@ -162,9 +164,12 @@ def main(*args, **kwargs):
     if not all([action.token, CURRENT_TAG]):
         raise ValueError("One or more required environment variables are missing.")
 
-    previous_tag = PREVIOUS_TAG or get_previous_tag()
-
     # Get the diff between the tags
+    previous_tag = (
+        PREVIOUS_TAG
+        if PREVIOUS_TAG and "none" not in PREVIOUS_TAG.lower() and PREVIOUS_TAG != CURRENT_TAG
+        else get_previous_tag()
+    )
     diff = get_release_diff(action.repository, previous_tag, CURRENT_TAG, action.headers_diff)
 
     # Get PRs merged between the tags