Add a script to filter dependabot dependencies

The new script filters dependabot's configuration to ignore direct
dependencies which are tracked by parent Submariner projects. The
reasoning is that such dependencies end up aligned during the release
process anyway, so there isn't much point in processing PRs across all
the projects to bump dependencies which will catch up later anyway.

Signed-off-by: Stephen Kitt <[email protected]>

scripts/shared/filter_dependabot.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright Contributors to the Submariner project.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Adds ignore statements to .github/dependabot.yml for direct dependencies
+# already present in parent Submariner projects (i.e. projects which the
+# processed project depends on).
+#
+# Existing entries are removed, starting with the first entry marked
+# "Our own dependencies are handled during releases" (if none, all
+# entries are removed). This tool assumes that all Submariner projects
+# are checked out alongside each other (i.e. ../shipyard contains
+# Shipyard, ../admiral contains Admiral etc.).
+
+declare -a seendeps
+
+function depseen() {
+    local dep
+    for dep in "${seendeps[@]}"; do
+        if [ "$dep" = "$1" ]; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+base="$(pwd)"
+conffile="${base}/.github/dependabot.yml"
+
+for dir in $(yq '(.updates[] | select(.package-ecosystem == "gomod")).directory' "$conffile"); do
+
+    (cd "${base}${dir}" || exit
+
+     # Count the ignores
+     ignores="$(yq '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'") | .ignore | length' "$conffile")"
+     firstauto=0
+
+     # Look for the start of automated ignores
+     for (( i=0; i < ignores; i++ )); do
+         if [ "$(yq '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'") | .ignore['"$i"'].dependency-name' "$conffile")" = "github.com/submariner-io/*" ]; then
+             firstauto=$i
+             break
+         fi
+     done
+
+     # Remove the existing automated ignores
+     while [ "$(yq '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'") | .ignore | length' "$conffile")" -gt "$firstauto" ]; do
+         yq -i -P 'del(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'") | .ignore['"$firstauto"'])' "$conffile"
+     done
+
+     # "See" remaining ignores
+     read -ar seendeps < <(yq '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'") | .ignore[].dependency-name)' "$conffile")
+
+     # Restore the submariner-io exclusion
+     yq -i -P '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'")).ignore['"$firstauto"'].dependency-name = "github.com/submariner-io/*"' "$conffile"
+     yq -i -P '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'")).ignore['"$firstauto"'] head_comment = "Our own dependencies are handled during releases"' "$conffile"
+
+     # Ignore all parent dependencies
+     for parent in $(GOWORK=off go list -m -mod=mod -json all | jq -r 'select(.Path | contains("/submariner-io/")) | select(.Main != true) .Path | gsub("github.com/submariner-io/"; "")'); do
+         first=true
+         for dep in $(GOWORK=off go list -m -mod=mod -json all | jq -r 'select(.Path | contains("/submariner-io") | not) | select(.Indirect != true) | select(.Main != true) .Path'); do
+             if ! depseen "$dep"; then
+                 if grep -q "$dep" "$base/../$parent/go.mod" && ! grep -q "$dep .*// indirect" "$base/../$parent/go.mod"; then
+                     yq -i -P '(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'")).ignore += { "dependency-name": "'"$dep"'" }' "$conffile"
+                     if $first; then
+                         yq -i -P 'with(.updates[] | select(.package-ecosystem == "gomod") | select(.directory == "'"$dir"'"); .ignore[.ignore | length - 1] head_comment = "Managed in '"$parent"'")' "$conffile"
+                         first=false
+                     fi
+                     seendeps+=("$dep")
+                 fi
+             fi
+         done
+     done)
+
+done