#!/bin/sh

REPO_PATH="$1"
LOCAL_BRANCH="$2"
REMOTE="$3"
REMOTE_BRANCH="$4"

LOCAL_BRANCH=${LOCAL_BRANCH:="master"}
REMOTE=${REMOTE:="origin"}
REMOTE_BRANCH=${REMOTE_BRANCH:=$LOCAL_BRANCH}

usage() {
  echo "git_check.sh repo [local_branch [remote [remote_branch]]]" > /dev/stderr
  echo "  repo: repository path" > /dev/stderr
  echo "  local_branch: name of local branch" > /dev/stderr
  echo "  remote: name of remote" > /dev/stderr
  echo "  remote_branch: name of remote branch" > /dev/stderr
}

check_vars()
{
  if [ -z "$REPO_PATH" ]
  then
    echo "Missing repo path" > /dev/stderr
    usage
    exit 1
  fi
  if [ ! -d $REPO_PATH ]
  then
    echo "$REPO_PATH should be a directory" > /dev/stderr
    usage
    exit 2
  fi
}

check_vars

git -C "$REPO_PATH" fetch "$REMOTE"
git -C "$REPO_PATH" log "$LOCAL_BRANCH..${REMOTE}/${REMOTE_BRANCH}"