From a7a8cd6e5de0d89519eebbb21a16679101c5c82c Mon Sep 17 00:00:00 2001
From: Tim Hockin <thockin@google.com>
Date: Sun, 12 Mar 2023 22:10:47 -0700
Subject: [PATCH] Codegen: subprojects: nuke existing files

---
 .../generate-internal-groups.sh               | 102 +++++++++++++++++-
 1 file changed, 97 insertions(+), 5 deletions(-)

diff --git a/staging/src/k8s.io/code-generator/generate-internal-groups.sh b/staging/src/k8s.io/code-generator/generate-internal-groups.sh
index c953375bc92..f60e1cc2570 100755
--- a/staging/src/k8s.io/code-generator/generate-internal-groups.sh
+++ b/staging/src/k8s.io/code-generator/generate-internal-groups.sh
@@ -83,11 +83,24 @@ fi
 GOBIN="$(go env GOBIN)"
 gobin="${GOBIN:-$(go env GOPATH)/bin}"
 
+function git_find() {
+    # Similar to find but faster and easier to understand.  We want to include
+    # modified and untracked files because this might be running against code
+    # which is not tracked by git yet.
+    git ls-files -cmo --exclude-standard "$@"
+}
+
+function git_grep() {
+    # We want to include modified and untracked files because this might be
+    # running against code which is not tracked by git yet.
+    git grep --untracked "$@"
+}
 function codegen::join() { local IFS="$1"; shift; echo "$*"; }
 
 # enumerate group versions
 ALL_FQ_APIS=() # e.g. k8s.io/kubernetes/pkg/apis/apps k8s.io/api/apps/v1
 EXT_FQ_APIS=() # e.g. k8s.io/api/apps/v1
+GROUP_VERSIONS=() # e.g. apps/v1
 for GVs in ${GROUPS_WITH_VERSIONS}; do
   IFS=: read -r G Vs <<<"${GVs}"
 
@@ -99,10 +112,18 @@ for GVs in ${GROUPS_WITH_VERSIONS}; do
   for V in ${Vs//,/ }; do
     ALL_FQ_APIS+=("${EXT_APIS_PKG}/${G}/${V}")
     EXT_FQ_APIS+=("${EXT_APIS_PKG}/${G}/${V}")
+    GROUP_VERSIONS+=("${G}/${V}")
   done
 done
 
 if grep -qw "deepcopy" <<<"${GENS}"; then
+  # Nuke existing files
+  for dir in $(GO111MODULE=on go list -f '{{.Dir}}' "${ALL_FQ_APIS[@]}"); do
+    pushd "${dir}" >/dev/null
+    git_find -z ':(glob)**'/zz_generated.deepcopy.go | xargs -0 rm -f
+    popd >/dev/null
+  done
+
   echo "Generating deepcopy funcs"
   "${gobin}/deepcopy-gen" \
       --input-dirs "$(codegen::join , "${ALL_FQ_APIS[@]}")" \
@@ -111,6 +132,13 @@ if grep -qw "deepcopy" <<<"${GENS}"; then
 fi
 
 if grep -qw "defaulter" <<<"${GENS}"; then
+  # Nuke existing files
+  for dir in $(GO111MODULE=on go list -f '{{.Dir}}' "${ALL_FQ_APIS[@]}"); do
+    pushd "${dir}" >/dev/null
+    git_find -z ':(glob)**'/zz_generated.defaults.go | xargs -0 rm -f
+    popd >/dev/null
+  done
+
   echo "Generating defaulters"
   "${gobin}/defaulter-gen"  \
       --input-dirs "$(codegen::join , "${EXT_FQ_APIS[@]}")" \
@@ -119,6 +147,13 @@ if grep -qw "defaulter" <<<"${GENS}"; then
 fi
 
 if grep -qw "conversion" <<<"${GENS}"; then
+  # Nuke existing files
+  for dir in $(GO111MODULE=on go list -f '{{.Dir}}' "${ALL_FQ_APIS[@]}"); do
+    pushd "${dir}" >/dev/null
+    git_find -z ':(glob)**'/zz_generated.conversion.go | xargs -0 rm -f
+    popd >/dev/null
+  done
+
   echo "Generating conversions"
   "${gobin}/conversion-gen" \
       --input-dirs "$(codegen::join , "${ALL_FQ_APIS[@]}")" \
@@ -127,8 +162,20 @@ if grep -qw "conversion" <<<"${GENS}"; then
 fi
 
 if grep -qw "applyconfiguration" <<<"${GENS}"; then
-  echo "Generating apply configuration for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/${APPLYCONFIGURATION_PKG_NAME:-applyconfiguration}"
   APPLY_CONFIGURATION_PACKAGE="${OUTPUT_PKG}/${APPLYCONFIGURATION_PKG_NAME:-applyconfiguration}"
+
+  # Nuke existing files
+  root="$(GO111MODULE=on go list -f '{{.Dir}}' "${APPLY_CONFIGURATION_PACKAGE}" 2>/dev/null || true)"
+  if [ -n "${root}" ]; then
+    pushd "${root}" >/dev/null
+    git_grep -l --null \
+      -e '^// Code generated by applyconfiguration-gen. DO NOT EDIT.$' \
+      ':(glob)**/*.go' \
+      | xargs -0 rm -f
+    popd >/dev/null
+  fi
+
+  echo "Generating apply configuration for ${GROUPS_WITH_VERSIONS} at ${APPLY_CONFIGURATION_PACKAGE}"
   "${gobin}/applyconfiguration-gen" \
       --input-dirs "$(codegen::join , "${EXT_FQ_APIS[@]}")" \
       --output-package "${APPLY_CONFIGURATION_PACKAGE}" \
@@ -136,17 +183,44 @@ if grep -qw "applyconfiguration" <<<"${GENS}"; then
 fi
 
 if grep -qw "client" <<<"${GENS}"; then
-  echo "Generating clientset for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/${CLIENTSET_PKG_NAME:-clientset}"
+  CLIENTSET_PKG="${CLIENTSET_PKG_NAME:-clientset}"
+  CLIENTSET_NAME="${CLIENTSET_NAME_VERSIONED:-versioned}"
+
+  # Nuke existing files
+  root="$(GO111MODULE=on go list -f '{{.Dir}}' "${OUTPUT_PKG}/${CLIENTSET_PKG}/${CLIENTSET_NAME}" 2>/dev/null || true)"
+  if [ -n "${root}" ]; then
+    pushd "${root}" >/dev/null
+    git_grep -l --null \
+      -e '^// Code generated by client-gen. DO NOT EDIT.$' \
+      ':(glob)**/*.go' \
+      | xargs -0 rm -f
+    popd >/dev/null
+  fi
+
+  echo "Generating clientset for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/${CLIENTSET_PKG}"
   "${gobin}/client-gen" \
-      --clientset-name "${CLIENTSET_NAME_VERSIONED:-versioned}" \
+      --clientset-name "${CLIENTSET_NAME}" \
       --input-base "" \
       --input "$(codegen::join , "${EXT_FQ_APIS[@]}")" \
-      --output-package "${OUTPUT_PKG}/${CLIENTSET_PKG_NAME:-clientset}" \
+      --output-package "${OUTPUT_PKG}/${CLIENTSET_PKG}" \
       --apply-configuration-package "${APPLY_CONFIGURATION_PACKAGE:-}" \
       "$@"
 fi
 
 if grep -qw "lister" <<<"${GENS}"; then
+  # Nuke existing files
+  for gv in "${GROUP_VERSIONS[@]}"; do
+    root="$(GO111MODULE=on go list -f '{{.Dir}}' "${OUTPUT_PKG}/listers/${gv}" 2>/dev/null || true)"
+    if [ -n "${root}" ]; then
+      pushd "${root}" >/dev/null
+      git_grep -l --null \
+        -e '^// Code generated by lister-gen. DO NOT EDIT.$' \
+        ':(glob)**/*.go' \
+        | xargs -0 rm -f
+      popd >/dev/null
+    fi
+  done
+
   echo "Generating listers for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/listers"
   "${gobin}/lister-gen" \
       --input-dirs "$(codegen::join , "${EXT_FQ_APIS[@]}")" \
@@ -155,16 +229,34 @@ if grep -qw "lister" <<<"${GENS}"; then
 fi
 
 if grep -qw "informer" <<<"${GENS}"; then
+  # Nuke existing files
+  root="$(GO111MODULE=on go list -f '{{.Dir}}' "${OUTPUT_PKG}/informers/externalversions" 2>/dev/null || true)"
+  if [ -n "${root}" ]; then
+    pushd "${root}" >/dev/null
+    git_grep -l --null \
+      -e '^// Code generated by informer-gen. DO NOT EDIT.$' \
+      ':(glob)**/*.go' \
+      | xargs -0 rm -f
+    popd >/dev/null
+  fi
+
   echo "Generating informers for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/informers"
   "${gobin}/informer-gen" \
       --input-dirs "$(codegen::join , "${EXT_FQ_APIS[@]}")" \
-      --versioned-clientset-package "${OUTPUT_PKG}/${CLIENTSET_PKG_NAME:-clientset}/${CLIENTSET_NAME_VERSIONED:-versioned}" \
+      --versioned-clientset-package "${OUTPUT_PKG}/${CLIENTSET_PKG}/${CLIENTSET_NAME}" \
       --listers-package "${OUTPUT_PKG}/listers" \
       --output-package "${OUTPUT_PKG}/informers" \
       "$@"
 fi
 
 if grep -qw "openapi" <<<"${GENS}"; then
+  # Nuke existing files
+  for dir in $(GO111MODULE=on go list -f '{{.Dir}}' "${FQ_APIS[@]}"); do
+    pushd "${dir}" >/dev/null
+    git_find -z ':(glob)**'/zz_generated.openapi.go | xargs -0 rm -f
+    popd >/dev/null
+  done
+
   echo "Generating OpenAPI definitions for ${GROUPS_WITH_VERSIONS} at ${OUTPUT_PKG}/openapi"
   declare -a OPENAPI_EXTRA_PACKAGES
   "${gobin}/openapi-gen" \