push-chunks.sh

#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

BRANCH="16.0" # Branch name
REMOTE="origin" # Remote name
CHUNK_SIZE=900

# Get the total number of commits in the branch
TOTAL_COMMITS=$(git rev-list --count $BRANCH)
echo "Total commits in $BRANCH: $TOTAL_COMMITS"

# Calculate how many chunks are needed
NUM_CHUNKS=$((TOTAL_COMMITS / CHUNK_SIZE))
if [ $((TOTAL_COMMITS % CHUNK_SIZE)) -ne 0 ]; then
    NUM_CHUNKS=$((NUM_CHUNKS + 1))
fi
echo "Number of chunks to push: $NUM_CHUNKS"

# Get all commits from the branch in reverse order
COMMIT_HASHES=$(git rev-list --reverse $BRANCH)

# Loop for chunked pushing
for ((i=1; i<=$NUM_CHUNKS; i++))
do
   # Calculate the commit range for each chunk
   CHUNK_START=$(( (i - 1) * CHUNK_SIZE + 1))
   CHUNK_END=$(( i * CHUNK_SIZE ))
   if [ $CHUNK_END -gt $TOTAL_COMMITS ]; then
       CHUNK_END=$TOTAL_COMMITS
   fi

   # Extract the start and end commit hashes for this chunk
   START_COMMIT=$(echo "$COMMIT_HASHES" | sed -n "${CHUNK_START}p")
   END_COMMIT=$(echo "$COMMIT_HASHES" | sed -n "${CHUNK_END}p")

   # Handle the case where we're pushing the first chunk
   if [ $i -eq 1 ]; then
       RANGE_REF="$START_COMMIT"
   else
       RANGE_REF="$START_COMMIT^"
   fi

   echo "Pushing commits from $START_COMMIT to $END_COMMIT to $REMOTE/$BRANCH"
   git push $REMOTE +$RANGE_REF:$BRANCH -f
   if [ $? -ne 0 ]; then
       echo "Push failed for commits from $START_COMMIT to $END_COMMIT. Exiting."
       exit 1
   fi
done

# Final push to ensure the latest state is pushed
echo "Pushing the final state of $BRANCH to $REMOTE/$BRANCH"
git push $REMOTE +$BRANCH:$BRANCH -f