git-push-chunk.sh

#!/usr/bin/env bash
set -eu
# number of commits to push at once
batch_size=${1:-'100'}
# tgt_remote name to push to
tgt_remote=${2:-'origin'}
# git options
gitopts=${3:-''}

# some definitions for colors
LRED='\033[1;31m'
LGRN='\033[1;32m'
LPUR='\033[1;35m'
LCYA='\033[1;36m'
LWHT='\033[1;37m'
RST='\033[0m'

# get current branch name
push_branch=$(git rev-parse --abbrev-ref HEAD)
# check if the branch exists on the tgt_remote
if git show-ref --quiet --verify "refs/remotes/${tgt_remote}/${push_branch}"; then
    # only push commits not already pushed to the tgt_remote
    range="${tgt_remote}/${push_branch}..HEAD"
else
    # push all the commits
    range='HEAD'
fi

echo -e "${LWHT}Pushing ${LCYA}${range}${LWHT} to remote ${LGRN}${tgt_remote}${RST}"
# count the number of commits to push
commit_count=$(git log --first-parent --format=format:x ${range} | wc -l)
batch_count=$(( (commit_count / batch_size) + 1 ))
echo -e "${LPUR}${commit_count}${LWHT} refs to push, ${LPUR}${batch_count}${LWHT} batches of ${LPUR}${batch_size}${LWHT}${RST}\n"

# push each batch
for i in $(seq "$commit_count" "-$batch_size" 1); do
    # get the hash of the commit to push
    hash=$(git log --first-parent --reverse --format=format:%H --skip "$i" -n1)
    batch=$(( (commit_count - i) / batch_size ))
    echo -e "${LWHT}   push batch ${LGRN}${batch}${LWHT}/${LCYA}${batch_count}:${RST}\n"
    git push "${tgt_remote}" "${hash}:refs/heads/${push_branch}" ${gitopts}
    echo ''
done
# push the final partial batch
echo -e "${LWHT}  push final batch ${LCYA}${batch_count}:${RST}\n"
git push "${tgt_remote}" "${push_branch}" ${gitopts}
echo -e "${LGRN}Done!${RST}"