🌱 Add go-version check to avoid introducing a version that we cannot support yet

.github/workflows/go-verdiff.yaml

@@ -0,0 +1,17 @@
+name: go-verdiff
+on:
+  pull_request:
+    paths:
+      - '**.mod'
+      - '.github/workflows/go-verdiff.yaml'
+    branches:
+      - main
+jobs:
+  go-verdiff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check golang version
+        run: hack/tools/check-go-version.sh "${{ github.event.pull_request.base.sha }}"

hack/tools/check-go-version.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+
+###########################################
+# Check Go version in go.mod files
+# and ensure it is not greater than the
+# version in the main go.mod file.
+# Also check if the version in the main
+# go.mod file is updated in the
+# submodules.
+# This script is intended to be run
+# as part of the CI pipeline to ensure
+# that the version of Go that we can use
+# is not accidentally upgraded.
+# Source: https://github.com/operator-framework/operator-controller/blob/main/hack/tools/check-go-version.sh
+#
+# PS: We have the intention to centralize
+# this implementation in the future.
+###########################################
+
+BASE_REF=${1:-main}
+GO_VER=$(sed -En 's/^go (.*)$/\1/p' "go.mod")
+OLDIFS="${IFS}"
+IFS='.' MAX_VER=(${GO_VER})
+IFS="${OLDIFS}"
+
+if [ ${#MAX_VER[*]} -ne 3 -a ${#MAX_VER[*]} -ne 2 ]; then
+    echo "Invalid go version: ${GO_VER}"
+    exit 1
+fi
+
+GO_MAJOR=${MAX_VER[0]}
+GO_MINOR=${MAX_VER[1]}
+GO_PATCH=${MAX_VER[2]}
+
+RETCODE=0
+
+check_version () {
+    local whole=$1
+    local file=$2
+    OLDIFS="${IFS}"
+    IFS='.' ver=(${whole})
+    IFS="${OLDIFS}"
+
+    if [ ${ver[0]} -gt ${GO_MAJOR} ]; then
+        echo "${file}: ${whole}: Bad golang version (expected ${GO_VER} or less)"
+        return 1
+    fi
+    if [ ${ver[1]} -gt ${GO_MINOR} ]; then
+        echo "${file}: ${whole}: Bad golang version (expected ${GO_VER} or less)"
+        return 1
+    fi
+
+    if [ ${#ver[*]} -eq 2 ] ; then
+        return 0
+    fi
+    if [ ${#ver[*]} -ne 3 ] ; then
+        echo "${file}: ${whole}: Badly formatted golang version"
+        return 1
+    fi
+
+    if [ ${ver[1]} -eq ${GO_MINOR} -a ${ver[2]} -gt ${GO_PATCH} ]; then
+        echo "${file}: ${whole}: Bad golang version (expected ${GO_VER} or less)"
+        return 1
+    fi
+    return 0
+}
+
+echo "Found golang version: ${GO_VER}"
+
+for f in $(find . -name "*.mod"); do
+    v=$(sed -En 's/^go (.*)$/\1/p' ${f})
+    if [ -z ${v} ]; then
+        echo "${f}: Skipping, no version found"
+        continue
+    fi
+    if ! check_version ${v} ${f}; then
+        RETCODE=1
+    fi
+    old=$(git grep -ohP '^go .*$' "${BASE_REF}" -- "${f}")
+    old=${old#go }
+    new=$(git grep -ohP '^go .*$' "${f}")
+    new=${new#go }
+    # If ${old} is empty, it means this is a new .mod file
+    if [ -z "${old}" ]; then
+        continue
+    fi
+    # Check if patch version remains 0: X.x.0 <-> X.x
+    if [ "${new}.0" == "${old}" -o "${new}" == "${old}.0" ]; then
+        continue
+    fi
+    if [ "${new}" != "${old}" ]; then
+        echo "${f}: ${v}: Updated golang version from ${old}"
+        RETCODE=1
+    fi
+done
+
+exit ${RETCODE}