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_PATH="${1:?"Local directory not specified!"}"
LOCAL_DIRNAME=$(basename "$LOCAL_PATH")
GIT_BRANCH="${2:?"Branch to compare with not specified"}"
REMOTE_HOST="${3:?"Remote host not specified!"}"
REMOTE_DIR="${4:?"Remote directory not specified!"}"

# check if local and remote repos are on the same commit. If not, error.
LOCAL_COMMIT=$(git -C "$LOCAL_PATH" rev-parse "$GIT_BRANCH")
REMOTE_COMMIT=$(ssh "$REMOTE_HOST" " git -C '$REMOTE_DIR' rev-parse '$GIT_BRANCH' ")
if [ "$LOCAL_COMMIT" != "$REMOTE_COMMIT" ]; then
  echo "Local and remote are on different commits. Abort."
  notify-send "❌❌❌ ${LOCAL_DIRNAME} ❌❌❌" "local and remote repositories are on different commits in branch ${GIT_BRANCH}!"
  exit
fi

# check if the local diff is empty, if so only reset the remote repository, then early exit
git -C "$LOCAL_PATH" update-index --refresh -q
git -C "$LOCAL_PATH" diff-index --quiet "$GIT_BRANCH" --
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 $?"
  notify-send "${LOCAL_DIRNAME} ✓" "Reset remote repo"
  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
echo "Syncing"
git -C "$LOCAL_PATH" diff "$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 notify of success/failure
exit_status=$?
if [ $exit_status -eq 0 ]; then
  echo "Remote command succeeded (status 0)"
  notify-send "${LOCAL_DIRNAME} ✓" "Syncing successful"
else
  echo "Remote command failed with status $exit_status"
  notify-send "❌❌❌ ${LOCAL_DIRNAME} ❌❌❌" "Syncing FAILED"
fi