A bash script that will pull from upstream on a directory of git repositories

git-pull-all.sh

#!/usr/bin/env bash

# Does a git pull for every git repository in a directory and tracks the results

# Resolves a relative directory
# source: https://stackoverflow.com/questions/7126580/expand-a-possible-relative-path-in-bash
function dir_resolve()
{
  cd "$1" 2>/dev/null || return $?
  pwd -P
}

# prints an error message in red
function print_error()
{
  printf "\x1B[91m%b\x1B[0m" "$1"
}

# prints a success message in green
function print_success()
{
  printf "\x1B[32m%b\x1B[0m" "$1"
}

# prints a warning in yellow
function print_warning()
{
  printf "\x1B[33m%b\x1B[0m" "$1"
}

# outputs usage
function usage()
{
  echo "pull-all [directory] [search_depth]"
  echo "    directory     Source directory to search for git repositories (defaults to current directory)"
  echo "    search_depth  Depth to search when looking for repositories (defaults to \"2\")"
}

# catch usage cases (--help flag or no parameters)
if [ "$1" == "--help" ]; then
  usage
  exit 0
fi

if [ $# -eq 0 ]; then
  usage
  exit 0;
fi

# parameters
src_dir=$(dir_resolve "$1")
default_git_find_depth=${2:-2} # 2 by default

# utility characters
str_check="\xE2\x9C\x94" # check mark

# find the git repositories
repos=$(find "$src_dir" -type d -maxdepth "$default_git_find_depth" -name ".git" | sort | sed 's/\/\.git$//g')

#loop through the repos
for repo in $repos; do
  # output the repo name
  printf "\x1B[1m%s\x1B[0m" "$(basename "$repo")"

  # go to the repo and do pre-pull checks
  cd "$repo" || exit $?
  printf " [%s]..." "$(git rev-parse --abbrev-ref HEAD)"
  has_upstream=$(git status -sb | grep "\.\.\..*$")
  upstream_gone=$(echo "$has_upstream" | grep "\[gone\]")
  local_changes=$(git diff-index --name-only HEAD --)

  if [ -z "$has_upstream" ]; then
    print_warning "No upstream!\n"
    continue
  elif [ -n "$upstream_gone" ]; then
    print_error "Upstream gone!\n"
    continue
  elif [ -n "$local_changes" ]; then
    print_warning "Local changes exist\n"
    continue
  fi

  # try to pull and display output
  pull_output=$(git pull)

  if [ "$?" != "0" ]; then
    # pull failed
    print_error "Error!\n"
  elif [ "Already up to date." == "$pull_output" ]; then
    # no changes to pull
    print_success "$str_check\n" # check
  elif [[ "$pull_output" =~ "Updating".* ]]; then
    # we got changes
    print_success "$str_check Updated!\n"
  else
    # something unknown happened but without an error
    print_warning "???"
  fi
done