From d1bbfbc48e7af1613a3d74a88ea95a27dcbedb35 Mon Sep 17 00:00:00 2001
From: Tobias Schwarz <info@tobias-schwarz.com>
Date: Mon, 22 Jul 2024 10:46:41 +0000
Subject: [PATCH] workflows: add ip prefix duplicate check

---
 .github/checks/check-ip-prefix-duplicates.sh  | 24 +++++++++++++++++++
 .../workflows/check-ip-prefix-duplicates.yml  | 16 +++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100755 .github/checks/check-ip-prefix-duplicates.sh
 create mode 100644 .github/workflows/check-ip-prefix-duplicates.yml

diff --git a/.github/checks/check-ip-prefix-duplicates.sh b/.github/checks/check-ip-prefix-duplicates.sh
new file mode 100755
index 000000000..7e6572820
--- /dev/null
+++ b/.github/checks/check-ip-prefix-duplicates.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Change to the locations directory
+cd locations || exit 1
+
+# Extract IPv4 prefixes, sort them, and check for duplicates
+ipv4_duplicates=$(cat * | sed -nE 's/^\s*prefix:\s*["'\'']?([^"\''\s#]+)["'\'']?\s*(#.*)?$/\1/p' | sort | uniq -cd)
+
+# Extract IPv6 prefixes, sort them, and check for duplicates
+ipv6_duplicates=$(cat * | sed -n 's/.*ipv6_prefix:\s*["'\'']\?\([0-9a-fA-F:]\+::\/[0-9]\+\)["'\'']\?.*/\1/p' | sort | uniq -cd)
+
+if [ -n "$ipv4_duplicates" ] || [ -n "$ipv6_duplicates" ]; then
+  if [ -n "$ipv4_duplicates" ]; then
+    echo "Duplicate IPv4 prefixes found:"
+    echo "$ipv4_duplicates"
+  fi
+  if [ -n "$ipv6_duplicates" ]; then
+    echo "Duplicate IPv6 prefixes found:"
+    echo "$ipv6_duplicates"
+  fi
+  exit 1
+else
+  echo "No duplicate prefixes found."
+fi
diff --git a/.github/workflows/check-ip-prefix-duplicates.yml b/.github/workflows/check-ip-prefix-duplicates.yml
new file mode 100644
index 000000000..2ff914d6d
--- /dev/null
+++ b/.github/workflows/check-ip-prefix-duplicates.yml
@@ -0,0 +1,16 @@
+name: Check for duplicate IP prefixes
+
+on: [push, pull_request]
+
+jobs:
+  ipv6-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run IP prefix duplicate check
+        run: |
+          ./.github/checks/check-ip-prefix-duplicates.sh