git_upd

#!/usr/bin/env bash
# credit: @chrstphr
# $1 is local directory path
# $2 is git branch to create diff against
# $3 is ssh remote host
# $4 is remote directory path

LOCAL_DIR="${1:?"Local directory not specified!"}"
GIT_BRANCH="${2:?"Branch to compare with not specified"}"
REMOTE_HOST="${3:?"Remote host not specified!"}"
REMOTE_DIR="${4:?"Remote directory not specified!"}"

# check if the diff is empty, if so only reset the remote repository, then exit (early exit here!)
git -C "$LOCAL_DIR" update-index --refresh
git -C "$LOCAL_DIR" diff-index --quiet HEAD --
if [ $? -eq 0 ]; then
  echo "Git status was empty, therefore just clearing remote repo"
  ssh "$REMOTE_HOST" " git -C '$REMOTE_DIR' reset --hard '$GIT_BRANCH' "
  echo "Exit status of the clearing operation was $?"
  exit
fi

# git apply --index adds files that are untracked into the index, such that on
# the next git reset, this file will be deleted. Therefore, there will be no
# conflicts with untracked files
git -C "$LOCAL_DIR" diff "$GIT_BRANCH" | ssh "$REMOTE_HOST" " git -C '$REMOTE_DIR' reset --hard '$GIT_BRANCH' && git -C '$REMOTE_DIR' apply --index --whitespace=nowarn - "

# get the exit status of the above command (even if the command within ssh fails, that is propagated to here) to send an error notification if necessary
exit_status=$?
if [ $exit_status -eq 0 ]; then
  echo "Remote command succeeded (status 0)"
else
  echo "Remote command failed with status $exit_status"
  notify-send "Uncommitted-changes-sync error" "${LOCAL_DIR}"
fi