[[Archived bad quality mess when I used to not know better - just use git fetch && git push upstream 'refs/remotes/A/*:refs/heads/*' instead of this crap!]] Synchronize origin's branches with upstream counterparts (NOTE: assumes development model of keeping track of local changes with separate branch names)

git-sync-upstream.sh

#!/bin/bash
set -e
old_pwd="$PWD"

do_msg() {
	printf "\\r[%s:%s] - %s" "$reponame" "$branch" "$*" >&2
}

do_end_msg() {
	printf "\\r[%s:%s] - %s" "$reponame" "$branch" "$*" >&2
}

for repo in "$@"; do :
	if [ -r "$repo/.git/HEAD" ] && cd "$repo"; then :
		reponame=$(basename "$repo")
		if git diff-index --quiet --cached HEAD --
		then if git diff-files --quiet
		then :
			old_branch="$(git rev-parse --abbrev-ref HEAD)"
			if git config remote.upstream.url > /dev/null
			then upstream=y
			else upstream=n
			fi
			git for-each-ref refs/heads --format='%(refname)' | cut -d/ -f3- | while IFS=$'\n' read -r branch
			do :
				if ! git checkout -q "$branch"; then :
					do_end_msg "checkout failed!"
					continue
				fi
				do_msg "pulling from remote origin"
				if ! git pull origin "$branch"; then :
					do_end_msg "pulling from remote origin..FAILED!" >&2
					continue
				fi
				if [ x$upstream = xy ]; then :
					do_msg "pulling from remote upstream.."
					if ! git pull upstream "$branch"; then :
						do_end_msg "pulling from remote upstream..FAILED!"
						continue
					fi
					do_msg "pushing to remote origin.."
					if ! git push origin "$branch"; then :
						do_end_msg "pushing to remote upstream..FAILED!"
						continue
					fi
				fi
				do_end_msg "DONE!"
			done
			git checkout -q "$old_branch"
		else echo "Repository $reponame has unstaged changes, aborting." >&2; exit 16
		fi
		else echo "Repository $reponame has staged changes that has yet not been commited, aborting." >&2; exit 17
		fi
	fi
	cd "$old_pwd"
done