chore: update cherrypick script (#7525)

Signed-off-by: zirain <[email protected]>

Author: zirain

tools/hack/cherrypick-for-patch-release.sh

@@ -3,9 +3,10 @@
 # shellcheck disable=SC2207,SC2145,SC2181
 
 REPO=${REPO:-"envoyproxy/gateway"}
-LABEL=${LABEL:-"cherrypick/release-v1.5.1"}
+LABEL=${LABEL:-"cherrypick/release-v1.5.5"}
 DRY_RUN=${DRY_RUN:-true}
 # SKIP specific PR numbers, e.g. "123 456" after resolved conflicts.
+# TODO: can we read this from git hist?
 SKIP_PR_NUMBERS=${SKIP_PR_NUMBERS:-""}
 
 if ! command -v jq >/dev/null 2>&1; then
@@ -36,9 +37,10 @@ if [[ "$CURRENT_BRANCH" == "main" || "$CURRENT_BRANCH" == "master" ]]; then
 fi
 
 # current branch should create from the target release branch
-# e.g. for LABEL=cherrypick/release-v1.5.1
+# e.g. for LABEL=cherrypick/release-v1.5.5
 # git checkout release/v1.5
-# git checkout -b cherry-pick/v1.5.1
+# git pull
+# git checkout -b cherry-pick/v1.5.5
 BRANCH_SUFFIX=${LABEL#cherrypick/release-}
 TARGET_BRANCH="cherry-pick/$BRANCH_SUFFIX"
 if [[ "$CURRENT_BRANCH" != "$TARGET_BRANCH" ]]; then
@@ -47,10 +49,16 @@ if [[ "$CURRENT_BRANCH" != "$TARGET_BRANCH" ]]; then
 fi
 
 # get all merged PR numbers with the specified label, sorted by merged date ascending
-PR_NUMBERS=($(curl -s -H "Authorization: token $GITHUB_TOKEN" \
-  "https://api.github.com/repos/$REPO/pulls?state=closed&per_page=100" | \
+# the max items per page is 100, so we only get the first 100 PRs here
+# for more PRs, we need to implement pagination
+PAGES=(4 3 2 1)
+for page in "${PAGES[@]}"; do
+  PAGE_PR_NUMBERS=($(curl -s -H "Authorization: token $GITHUB_TOKEN" \
+  "https://api.github.com/repos/$REPO/pulls?state=closed&per_page=100&page=$page" | \
   jq -r ".[] | select(.labels[].name==\"$LABEL\" and .merged_at!=null) | {number, merged_at}" | \
   jq -s "sort_by(.merged_at) | .[].number"))
+  PR_NUMBERS+=("${PAGE_PR_NUMBERS[@]}")
+done
 
 echo "Total PRs to cherry-pick: ${#PR_NUMBERS[@]}"
 echo "PR_NUMBERS: ${PR_NUMBERS[@]}"
@@ -66,20 +74,21 @@ for PR in "${PR_NUMBERS[@]}"; do
     "https://api.github.com/repos/$REPO/pulls/$PR" | \
     jq -r ".merge_commit_sha")
 
+  if [[ "$DRY_RUN" == "true" ]]; then
+    echo "Dry run: git cherry-pick PR #$PR with SHA: $SHA"
+    continue
+  fi
+
   echo "PR #$PR merge commit SHA: $SHA"
   if [[ -z "$SHA" || "$SHA" == "null" ]]; then
     echo "PR #$PR merge commit $SHA not found"
     exit 1
   fi
   echo "Cherry-pick PR #$PR commit $SHA"
-  if [[ "$DRY_RUN" == "true" ]]; then
-    echo "Dry run: git cherry-pick PR #$PR with SHA: $SHA"
-    continue
-  fi
   git cherry-pick "$SHA"
-  make build
   if [[ $? -ne 0 ]]; then
     echo "Cherry-pick $SHA failed, please resolve conflicts and run the script again."
     exit 1
   fi
+  make build
 done