Shell script to sync remote branches from upstream and push them up to forked origin

git_sync_upstream.sh

#!/bin/sh

gh_sync_master() {
    UPSTREAM='upstream'
    MYREPO='origin'
    MASTER_BRANCH='master'
    AUTOMAGIC=true
    sync_upstream $UPSTREAM $MYREPO $MASTER_BRANCH $AUTOMAGIC
}

gh_sync_develop() {
    UPSTREAM='upstream'
    MYREPO='origin'
    MASTER_BRANCH='develop'
    AUTOMAGIC=true
    sync_upstream $UPSTREAM $MYREPO $MASTER_BRANCH $AUTOMAGIC
}

gh_sync_development() {
    UPSTREAM='upstream'
    MYREPO='origin'
    MASTER_BRANCH='development'
    AUTOMAGIC=true
    sync_upstream $UPSTREAM $MYREPO $MASTER_BRANCH $AUTOMAGIC
}

sync_upstream() {
    UPSTREAM=$1
    MYREPO=$2
    MASTER_BRANCH=$3
    AUTOMAGIC=$4
    CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`

    usage() {
    echo "Usage:"
    echo "$0 <upstream-remote> <target-remote>"
    echo ""
    echo "Example which ensures remote named 'origin' have all the same branches and tags as 'upstream'"
    echo "$0 upstream origin"
    kill -INT $$
    }

    if [ -z "$UPSTREAM" ]
    then
    echo "Missing upstream remote name."
    usage
    fi

    if [ -z "$MYREPO" ]
    then
    echo "Missing target remote name."
    usage
    fi

    if [  "$AUTOMAGIC" = true ]
    then
        REPLY='y'
    else
        read -p "1. This will setup '$MYREPO' to track all branches in '$UPSTREAM' - Are you sure ?" -n 1 -r
        echo -e "\n"
    fi

    echo "Fetching '$UPSTREAM'"
    git fetch $UPSTREAM

    if [[ $REPLY =~ ^[Yy]$ ]]
    then
        for brname in `git branch -r | grep "$UPSTREAM" | grep -v $MASTER_BRANCH | grep -v HEAD | sed -e 's/.*\///g'`; do git branch --track $brname  $UPSTREAM/$brname ; done
    fi

    if [  "$AUTOMAGIC" = true ]
    then
        REPLY='y'
    else
        read -p "1. This will merge '$UPSTREAM/$MASTER_BRANCH' into '$MASTER_BRANCH' - Are you sure ?" -n 1 -r
        echo -e "\n"
    fi

    if [[ $REPLY =~ ^[Yy]$ ]]
    then
        echo "Merging $UPSTREAM/$MASTER_BRANCH into local $MASTER_BRANCH..."
        git checkout $MASTER_BRANCH
        git merge $UPSTREAM/$MASTER_BRANCH
        git checkout $CURRENT_BRANCH
    fi

    if [  "$AUTOMAGIC" = true ]
    then
        REPLY='y'
    else
        read -p "1. This will remove any local branches not on '$MYREPO' - Are you sure ?" -n 1 -r
        echo -e "\n"
    fi

    if [[ $REPLY =~ ^[Yy]$ ]]
    then
        echo "Pruning local branches not found in '$MYREPO'..."
        git remote prune $MYREPO
    fi
    
    if [  "$AUTOMAGIC" = true ]
    then
        REPLY='y'
    else
        read -p "2. This will push all local branches and tags into '$MYREPO' - Are you sure ?" -n 1 -r
        echo -e "\n"
    fi

    if [[ $REPLY =~ ^[Yy]$ ]]
    then
    echo "Pushing branches..."
    git push --all $MYREPO
    echo "Pushing tags..."
    git push --tags $MYREPO
    fi
}

SYNC_GITHUB_FORK_INSTALL.txt

1. Copy 'git-sync-fork' script code from gist
2. Create a file called 'git-sync-fork.sh' in any directory available to you
3. Paste script into this new file 'git-sync-fork.sh' and save
4. Source the file (in your bash profile script) `source /path/to/file/git-sync-fork.sh`
5. Call either function: `gh_sync_[master|develop|development]` (for auto confirmation) or `sync_upstream upstream origin`

Example:

gh_sync_master
gh_sync_develop
gh_sync_development

OR

sync_upstream upstream origin master true