#!/bin/bash

export PS4='(${BASH_SOURCE}:${LINENO}): - [${SHLVL},${BASH_SUBSHELL},$?] $ '

function error_out()
{
        echo "Bailing out. See above for reason...."
        exit 1
}

function handle_failure() {
  local lineno=$1
  local fn=$2
  local exitstatus=$3
  local msg=$4
  local lineno_fns=${0% 0}
  if [[ "$lineno_fns" != "-1" ]] ; then
    lineno="${lineno} ${lineno_fns}"
  fi
  echo "${BASH_SOURCE[0]}: Function: ${fn} Line Number : [${lineno}] Failed with status ${exitstatus}: $msg"
}

trap 'handle_failure "${BASH_LINENO[*]}" "$LINENO" "${FUNCNAME[*]:-script}" "$?" "$BASH_COMMAND"' ERR

set -o errexit
set -o nounset
set -o pipefail
set -o functrace

WORKDIR="$(cd "$(dirname "$0")" && pwd)"
TARGET_DIR="${WORKDIR}/Docker"

cd "$TARGET_DIR"

# Iterate only over directories that are git repos
while IFS= read -r -d '' repo_dir; do
  echo "Updating: ${repo_dir}"
  pushd "$repo_dir" >/dev/null
  if [[ -d .git ]]; then
    git -c advice.detachedHead=false fetch --all --prune || true
    # Fast-forward only to avoid unintended merges
    git -c advice.detachedHead=false pull --ff-only || true
  else
    echo "Skipping (not a git repo): ${repo_dir}"
  fi
  popd >/dev/null
done < <(find . -mindepth 1 -maxdepth 1 -type d -print0)