Sync forked git repository

Here is a script to sync a forked (not mirrored) git repository. In my case I have new private branches I cannot push upstream, but I want the base branches to get synchronized with the upstream repository.

#!/bin/bash
set -e
# set -x

UPSTREAM=$1
REMOTES=$(git remote -v)

if [[ "$REMOTES" != *"$UPSTREAM"* ]]; then
    git remote add upstream $UPSTREAM
fi

git fetch
git fetch upstream
BRANCHES=$(git branch -a)
REMOTES=(${BRANCHES// /})
ORIGIN=()
UPSTREAM=()
LOCAL=()
for element in "${REMOTES[@]}"
do
    if [[ "$element" == *"origin"* ]]; then
        ORIGIN+=(${element#"remotes/origin/"})
    elif [[ "$element" == *"upstream"* ]]; then
        UPSTREAM+=(${element#"remotes/upstream/"})
    else
        LOCAL+=(${element#"*"})
    fi
done

for remote in "${UPSTREAM[@]}"
do
    echo ${remote}
    echo "==========================================="

    if [[ " ${ORIGIN[@]} " =~ "${remote} " ]]; then
        echo "merging ${remote}:"
        if [[ " ${LOCAL[@]} " =~ " ${remote} " ]]; then
            git checkout ${remote}
        else
            git checkout -b ${remote} origin/${remote}
        fi
        git merge upstream/${remote}
        git push
    else
        echo "adding new branch ${remote}:"
        git checkout ${remote}
        git push --set-upstream origin ${remote}
    fi
    echo ""
doneCode language: Bash (bash)

Usage – copy the script in your repository folder then

synch.sh ssh://upstream/remote/pathCode language: Bash (bash)