Feat: Überspringt Release/Publish bei bereits veröffentlichter Version

Prüft vor Build & Tests per Gitea Package-API, ob die aktuelle Crate-Version
schon in der Registry existiert, und bricht den Release/Publish-Job dann
gar nicht erst an, statt an einem Registry-Fehler zu scheitern.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K2DxAVavuu4vMb2MC2G15g

.gitea/workflows/main.yaml

@@ -11,6 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       code_changed: ${{ steps.filter.outputs.code }}
+      version_exists: ${{ steps.check-version.outputs.exists }}
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v7
@@ -28,10 +29,20 @@ jobs:
               - '.cargo/**'
               - '.gitea/workflows/main.yaml'
 
+      - name: Prüfe ob Version bereits in der Registry existiert
+        id: check-version
+        if: steps.filter.outputs.code == 'true'
+        env:
+          GITEA_URL: ${{ gitea.server_url || github.server_url }}
+          REPO_OWNER: ${{ gitea.repository_owner || github.repository_owner }}
+          TOKEN: ${{ secrets.PACKAGE_TOKEN || secrets.RELEASE_TOKEN || secrets.PUBLISH_TOKEN || secrets.API_TOKEN || secrets.PAT_TOKEN || secrets.CUSTOM_TOKEN || secrets.GITEA_TOKEN || secrets.GITHUB_TOKEN || github.token }}
+        run: |
+          python3 scripts/check-version-published.py
+
   release-and-publish:
     name: Build, Publish Crate to Gitea Registry & Create Release
     needs: detect-changes
-    if: needs.detect-changes.outputs.code_changed == 'true'
+    if: needs.detect-changes.outputs.code_changed == 'true' && needs.detect-changes.outputs.version_exists != 'true'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository

scripts/check-version-published.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""Prüft, ob die aktuelle Crate-Version bereits in der Gitea Cargo-Registry existiert.
+
+Liest Name und Version aus Cargo.toml und fragt die Gitea Package-API ab.
+Das Ergebnis wird als Step-Output "exists" (true/false) in GITHUB_OUTPUT
+geschrieben, damit der Release/Publish-Job komplett übersprungen werden kann,
+statt erst nach Build & Tests an einem "Version existiert bereits"-Fehler der
+Registry zu scheitern.
+"""
+
+import os
+import re
+import urllib.error
+import urllib.request
+
+
+def read_cargo_field(field, path="Cargo.toml"):
+    pattern = re.compile(rf'^{field}\s*=\s*"(.*)"')
+    with open(path) as f:
+        for line in f:
+            match = pattern.match(line.strip())
+            if match:
+                return match.group(1)
+    raise SystemExit(f"Feld '{field}' nicht in {path} gefunden.")
+
+
+def version_exists(gitea_url, owner, name, version, token):
+    url = f"{gitea_url}/api/v1/packages/{owner}/cargo/{name}/{version}"
+    req = urllib.request.Request(url, method="GET")
+    req.add_header("Authorization", f"token {token}")
+    try:
+        with urllib.request.urlopen(req, timeout=10) as resp:
+            return resp.status == 200
+    except urllib.error.HTTPError as e:
+        if e.code == 404:
+            return False
+        raise
+
+
+def main():
+    gitea_url = os.environ["GITEA_URL"].strip().rstrip("/")
+    owner = os.environ["REPO_OWNER"].strip()
+    token = os.environ["TOKEN"].strip()
+    github_output = os.environ["GITHUB_OUTPUT"]
+
+    name = read_cargo_field("name")
+    version = read_cargo_field("version")
+
+    print(f"Prüfe {name}@{version} in der Gitea Cargo Registry...")
+    exists = version_exists(gitea_url, owner, name, version, token)
+
+    if exists:
+        print(f"Version {version} existiert bereits in der Registry. Release/Publish wird übersprungen.")
+    else:
+        print(f"Version {version} ist neu.")
+
+    with open(github_output, "a") as f:
+        f.write(f"exists={'true' if exists else 'false'}\n")
+
+
+if __name__ == "__main__":
+    main()