#!/bin/bash

if [ $# -eq 1 ]; then
  if [ "$1" == "--help" ]; then
    >&2 echo \
'Usage:  gitolite-sync [options]
Synchronize the configured git repositories.

Options:
#HELPTEXT#              #'
    exit
  elif [ "$1" == "--version" ]; then
    echo '#VERSION#'
    exit
  fi
fi

if [ $# -ne 0 ]; then
  >&2 echo 'too many arguments'
  exit 1
fi

. "#ETCDIR#/gitolite-sync.conf"

if [ ${#repository_dirs[@]} -eq 0 ]; then
  >&2 echo 'no repository_dirs defined'
  exit 1
fi

for repository_dir in "${repository_dirs[@]}"; do
  if [ -z "${repository_dir}" ] || [ ! -d "${repository_dir}" ]; then
    >&2 printf 'cannot find "%s"\n' \
      "${repository_dir}"
    exit 1
  fi
done

for repository_dir in "${repository_dirs[@]}"; do
  find "${repository_dir}" \
    -type d \
    -name '*.git' \
    -printf '%p\n' \
    -prune \
  | while read -r path; do
    >&2 printf 'synchronizing "%s" ...\n' \
      "${path}"
    remotes=$(
      git -C "${path}" remote -v \
      | grep "${remote_regex}" \
      | awk '{print $1}' \
      | sort -u
    )
    if [ -z "${remotes}" ]; then
      >&2 printf 'Repository "%s" has no backup remotes.\n' \
        "${path}"
      continue
    fi
    for remote in ${remotes}; do
      git -C "${path}" fetch "${remote}" -p
    done
    branches=$(
      git -C "${path}" branch --all \
      | sed '
        s,^.\sremotes/[^/[:space:]]\+/,,
        t
        d
      '
    )
    if [ -n "$(git -C "${path}" tag -l)" ]; then
      has_tags=true
    else
      has_tags=false
    fi
    if [ -z "${branches}" ] && ! ${has_tags}; then
      >&2 printf 'Repository "%s" has no branches and no tags.\n' \
        "${path}"
      continue
    fi
    for remote in ${remotes}; do
      if ${has_tags}; then
        git -C "${path}" push "${remote}" --tags
      fi
      if [ -z "${branches}" ]; then
        continue
      fi
      for branch in ${branches}; do
        if ! git -C "${path}" branch \
          | sed 's/^.\s//' \
          | grep -qxF "${branch}"; then
          git -C "${path}" branch "${branch}" --track "${remote}/${branch}"
        fi
        git -C "${path}" pull --ff-only "${remote}" "${branch}" 2>/dev/null
        git -C "${path}" push "${remote}" "${branch}"
      done
    done
  done
done