Push to GitHub in chunks

git_chunk_push.sh

#!/bin/bash

# Ensure the script exits on any command failure
set -e

# Variables
REMOTE="git-private"
BRANCH="android-15-staging"
COMMIT_LIMIT=50000

# Verify that the current branch is pointing to HEAD
if ! git rev-parse --verify HEAD &>/dev/null; then
  echo "Error: Current directory is not a Git repository or HEAD is invalid."
  exit 1
fi

# Count the total number of commits in the repository
TOTAL_COMMITS=$(git rev-list --count HEAD)

# Calculate the number of chunks required
CHUNK_COUNT=$(( (TOTAL_COMMITS + COMMIT_LIMIT - 1) / COMMIT_LIMIT ))

echo "Total commits: $TOTAL_COMMITS"
echo "Commits per push: $COMMIT_LIMIT"
echo "Number of chunks: $CHUNK_COUNT"

# Push chunks of commits
for (( i=0; i<CHUNK_COUNT; i++ )); do
  START=$(( i * COMMIT_LIMIT + 1 ))
  END=$(( START + COMMIT_LIMIT - 1 ))
  
  if [ "$END" -gt "$TOTAL_COMMITS" ]; then
    END=$TOTAL_COMMITS
  fi
  
  # Create a temporary branch for the current chunk
  TMP_BRANCH="temp-chunk-$i"
  
  # Check if the temporary branch already exists
  if git show-ref --verify --quiet "refs/heads/$TMP_BRANCH"; then
    echo "Branch $TMP_BRANCH already exists."
    read -p "Do you want to delete it? (y/n): " RESPONSE
    if [[ "$RESPONSE" != "y" ]]; then
      echo "Exiting script as branch $TMP_BRANCH already exists."
      exit 1
    fi
    echo "Deleting existing branch $TMP_BRANCH..."
    git branch -D "$TMP_BRANCH"
  fi
  
  echo "Creating temporary branch $TMP_BRANCH for commits $START to $END..."
  COMMIT_HASH=$(git rev-list HEAD --reverse | sed -n "${END}p")
  git branch "$TMP_BRANCH" "$COMMIT_HASH"
  
  # Push the chunk to the remote branch
  echo "Pushing $TMP_BRANCH to $REMOTE:$BRANCH..."
  git push "$REMOTE" "$TMP_BRANCH:$BRANCH" --force
  
  # Delete the temporary branch
  echo "Deleting temporary branch $TMP_BRANCH..."
  git branch -D "$TMP_BRANCH"
done

echo "All chunks pushed successfully to $REMOTE:$BRANCH."