#!/usr/bin/env bash

set -eu

CURDIR=$(cd $(dirname ${BASH_SOURCE[0]}); pwd)
SPEC=${CURDIR}/SPECS/git-lfs.spec
VERSION=$(\grep "^Version:" ${SPEC} | \grep -Eo [0-9.]+)
RPMBUILD=(rpmbuild --define "_topdir ${CURDIR}")
LOG=${CURDIR}/build.log
SUDO=${SUDO=sudo}
export PATH=${PATH}:/usr/local/bin

exec 6>&1
exec 7>&2

exec > $LOG
exec 2>> $LOG

set -vx

echo "Downloading/checking for some essentials..." >&6
$SUDO yum install -y make curl which rpm-build tar bison

REDHAT_VERSION=($(head -n 1 /etc/redhat-release | \grep -Eo '[0-9]+'))
REDHAT_NAME=$(awk '{print $1}' /etc/redhat-release)

mkdir -p ${CURDIR}/{BUILD,BUILDROOT,SOURCES,RPMS,SRPMS}

if [ ! -e ${CURDIR}/SOURCES/v${VERSION}.tar.gz ]; then
  if [ "${BUILD_LOCAL:=0}" == "1" ]; then
    echo "Zipping up current checkout of git-lfs..." >&6
    if [[ ${REDHAT_VERSION} == 5 ]]; then
      rm -rvf ${CURDIR}/tmptar
      mkdir -p ${CURDIR}/tmptar/git-lfs-${VERSION}
      tar -c .. --exclude rpm --exclude .git --exclude tmptar | tar -x -C tmptar/git-lfs-${VERSION}/
      pushd ${CURDIR}/tmptar
        tar -zcf ${CURDIR}/SOURCES/v${VERSION}.tar.gz git-lfs-${VERSION}
      popd
      rm -rvf ${CURDIR}/tmptar
    else
      pushd ${CURDIR}/..
        tar -zcf ${CURDIR}/SOURCES/v${VERSION}.tar.gz --exclude v${VERSION}.tar.gz --exclude .git --exclude rpm . --transform "s:^:git-lfs-${VERSION}/:"
      popd
    fi
  else
    echo "Downloading git-lfs..." >&6
    mkdir -p ${CURDIR}/SOURCES
    pushd  ${CURDIR}/SOURCES
      curl -L -O https://github.com/github/git-lfs/archive/v${VERSION}.tar.gz
    popd
  fi
fi

if ! which go; then
  echo "Installing go... one way or another" >&6
  if [[ ${REDHAT_VERSION[0]} == 5 ]]; then
    $SUDO yum install -y curl.x86_64 glibc gcc
    ${CURDIR}/golang_patch.bsh
    "${RPMBUILD[@]}" -bb SPECS/golang.spec
    $SUDO yum install -y --nogpgcheck RPMS/noarch/golang-1*.rpm RPMS/noarch/golang-pkg-bin-linux-amd64-1*.rpm RPMS/noarch/golang-src-1*.noarch.rpm RPMS/noarch/golang-pkg-linux-amd64-1*.noarch.rpm
  else
    $SUDO yum install -y epel-release
    $SUDO yum install -y golang
  fi
fi

if which ruby > /dev/null 2>&1; then
  IFS_OLD=${IFS}
  IFS=.
  RUBY_VERSION=($(ruby -e "print RUBY_VERSION"))
  IFS=${IFS_OLD}
else
  RUBY_VERSION=(0 0 0)
fi

if [[ ${RUBY_VERSION[0]} < 2 ]]; then
  if [[ ${REDHAT_VERSION[0]} < 7 ]]; then
    echo "Downloading ruby..." >&6

    if ! rpm -q epel-release; then
      if [[ ${REDHAT_VERSION[0]} == 5 ]]; then
        pushd ${CURDIR}
          $SUDO rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
          curl -L -O http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm
          $SUDO yum install -y rpmforge-release-0.5.3-1.el5.rf.*.rpm
          rm rpmforge-release-0.5.3-1.el5.rf.*.rpm
        popd
      else
        $SUDO yum install epel-release #Part of centos 6+
      fi
    fi

    $SUDO yum install -y patch libyaml-devel glibc-headers autoconf gcc-c++ glibc-devel readline-devel zlib-devel libffi-devel openssl-devel automake libtool sqlite-devel
    pushd ${CURDIR}/SOURCES
    curl -L -O http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.gz
    popd
    echo "Building ruby..." >&6
    "${RPMBUILD[@]}" -bb SPECS/ruby.spec
    echo "Installing ruby..." >&6
    $SUDO yum install -y --nogpgcheck RPMS/x86_64/ruby*.rpm
  else
    $SUDO yum install -y ruby ruby-devel
  fi
fi

if ! which ronn; then
  echo "Downloading some ruby gems..." >&6
  pushd SOURCES
    curl -L -O https://rubygems.org/downloads/rdiscount-2.1.8.gem
    curl -L -O https://rubygems.org/downloads/hpricot-0.8.6.gem
    curl -L -O https://rubygems.org/downloads/mustache-1.0.1.gem
    curl -L -O https://rubygems.org/downloads/ronn-0.7.3.gem
  popd

  echo "Building ruby gems..." >&6
  "${RPMBUILD[@]}" -bb SPECS/rubygem-rdiscount.spec
  "${RPMBUILD[@]}" -bb SPECS/rubygem-mustache.spec
  "${RPMBUILD[@]}" -bb SPECS/rubygem-hpricot.spec
  "${RPMBUILD[@]}" -bb SPECS/rubygem-ronn.spec

  echo "Installing ruby gems..." >&6
  $SUDO yum install -y --nogpgcheck $(ls RPMS/noarch/rubygem-*.rpm RPMS/x86_64/rubygem-*.rpm | grep -v debuginfo)
fi

echo "Build git-lfs rpm..." >&6
"${RPMBUILD[@]}" -bb SPECS/git-lfs.spec
"${RPMBUILD[@]}" -bs SPECS/git-lfs.spec

echo "All Done!" >&6