#!/bin/bash

function mkchroot {

 # just in case we don't inherit.
 if [[ -z "${FUNCNAME}" ]];
 then
  FUNCNAME='mkchroot-standalone'
 fi
 
 ## Import settings
 if [ -f "build.conf" ];
 then
  echo "Now importing settings/variables."
  set -e
  source build.conf
  set +e
 else
  echo "You have not configured a build.conf OR you are not running from the project's root directory (the git repository's working directory)."
  echo "If you are indeed in the correct directory, you may copy the sample at ../extra/build.conf.sample,"
  echo "edit it for appropriate values, and copy to <PROJECT ROOT>/build.conf"
  echo 'This error is fatal. Dying.'
  exit 1
 fi
 
 if [[ ${EUID} -ne 0 ]];
 then
   #echo "This script must be run as root" 1>&2
   echo "This script must be run as root."
   exit 1
 fi
 
 if [ -z "${BASEDIR}" ];
 then
  echo 'You need to export the directory ("$BASEDIR") which will hold the chroots and the git project directory.'
  echo "(don't worry, there's a .gitignore for the chroots)"
  echo "e.g. export BASEDIR=\"/opt/dev/work/client-diag-disc/\""
  echo 'Dying.'
  exit 1
 fi
 
 if [ ! -d "${BASEDIR}" ];
 then
  echo "You need to make sure ${BASEDIR} is a valid, existing directory. This script does not automatically create it as a sanity measure."
  echo 'Dying.'
  exit 1
 fi
 
 if [[ "${EUID}" != "0" ]];
 then
  echo "This script must be run as root."
  echo 'Dying.'
  exit 1
 fi
 
 if [ -f ${LOCKFILE} ];
 then
   echo "Script already running, stale lockfile present, or an error occurred during last run."
   echo "Please clear ${LOCKFILE} by hand before attempting another build."
   echo -n "Timestamp of lockfile is: "
   ls -l ${LOCKFILE} | awk '{print $6" "$7" "$8}'
   exit 1
 else
   touch ${LOCKFILE}
 fi
 
 if [ -f "/usr/bin/systemd-nspawn" ];
  then
    CHROOTCMD="systemd-nspawn -D"
  else
    CHROOTCMD="${CHROOTDIR64}/bin/arch-chroot"
 fi

 if [[ "${I_AM_A_RACECAR}" == "y" ]];
 then
   RACECAR_CHK='nice -n "-19" '
 else
   RACECAR_CHK=""
 fi

 cd "${BASEDIR}"
 
 ## Set some vars.
 MIRROR='http://mirrors.kernel.org/archlinux'
 RLSDIR="${MIRROR}/iso/latest"
 
 CURRLS64=$(curl -s ${RLSDIR}/sha1sums.txt | grep bootstrap | awk '{print $2}' | grep 'x86_64')
 CKSUM64=$(curl -s ${RLSDIR}/sha1sums.txt | grep bootstrap | grep x86_64 | awk '{print $1}')
 CURRLS32=$(curl -s ${RLSDIR}/sha1sums.txt | grep bootstrap | awk '{print $2}' | grep 'i686')
 CKSUM32=$(curl -s ${RLSDIR}/sha1sums.txt | grep bootstrap | grep i686 | awk '{print $1}')
 
 ## Fetch latest tarball release
 echo "Checking/fetching snapshots..."
 if [ -f "latest.64.tar.gz" ];
 then
  LOCSUM64=$(sha1sum latest.64.tar.gz | awk '{print $1}')
  if [[ "${CKSUM64}" != "${LOCSUM64}" ]];
  then
    echo "WARNING: CHECKSUMS DON'T MATCH."
    echo "Local: ${LOCSUM64}"
    echo "Remote: ${CKSUM64}"
    echo "Fetching fresh copy."
    curl -o latest.64.tar.gz "${RLSDIR}/${CURRLS64}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
  fi
 else
  curl -o latest.64.tar.gz "${RLSDIR}/${CURRLS64}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
 fi
 
 if [ -f "latest.32.tar.gz" ];
 then
  LOCSUM32=$(sha1sum latest.32.tar.gz | awk '{print $1}')
  if [[ "${CKSUM32}" != "${LOCSUM32}" ]];
  then
    echo "WARNING: CHECKSUMS DON'T MATCH."
    echo "Local: ${LOCSUM32}"
    echo "Remote: ${CKSUM32}"
    echo "Fetching fresh copy."
    curl -o latest.32.tar.gz "${RLSDIR}/${CURRLS32}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
  fi
 else
   curl -o latest.32.tar.gz "${RLSDIR}/${CURRLS32}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
 fi
 
 if [ ! -f "${CHROOTDIR32}/etc/pacman.d/gnupg/trustdb.gpg" ] || [ ! -f "${CHROOTDIR64}/etc/pacman.d/gnupg/trustdb.gpg" ];
 then
   # Now let's ${BASEDIR}/extract that shit
   echo "Extracting snapshots. This will take a while..."
   ## 64-bit
   tar -xpzf latest.64.tar.gz
   ## 32-bit
   tar -xpzf latest.32.tar.gz
   
   # And configure the package manager
   echo "Configuring snapshots..."
   touch ${LOCKFILE}
   sleep 2
   find ${BASEDIR}/extra/pre-build.d/ -exec touch '{}' \;
   rsync -a --exclude '/32' --exclude '/64' ${BASEDIR}/extra/pre-build.d/. ${BASEDIR}/root.x86_64/.
   rsync -a --exclude '/32' --exclude '/64' ${BASEDIR}/extra/pre-build.d/. ${BASEDIR}/root.i686/.
   rsync -a ${BASEDIR}/extra/pre-build.d/64/. ${BASEDIR}/root.x86_64/.
   rsync -a ${BASEDIR}/extra/pre-build.d/32/. ${BASEDIR}/root.i686/.
   chmod -f 755 ${BASEDIR}/extra/pre-build.d/{32/,64/,}etc/customizepkg.d/*
   find ${BASEDIR}/root.x86_64/ -newer ${LOCKFILE} -exec chown -R root:root '{}' \;
   find ${BASEDIR}/root.i686/ -newer ${LOCKFILE} -exec chown -R root:root '{}' \;
   for i in i686 x86_64;
   do
     cat > ${BASEDIR}/root.${i}/etc/os-release << EOF
NAME="Arch Linux"
ID=arch
PRETTY_NAME="Arch Linux"
ANSI_COLOR="0;36"
HOME_URL="https://www.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://bugs.archlinux.org/"
EOF
   done   

   # And make it usable.
   echo "Initializing chroots..."
   
   for i in ${CHROOTDIR32} ${CHROOTDIR64};
   do
    echo "Prepping ${i}. This will take a while..."
    echo -n "...Key initializing..."
    ${CHROOTCMD} ${i}/ ${RACECAR_CHK}pacman-key --init >> "${LOGFILE}.${FUNCNAME}" 2>&1
    echo "Done."
    echo -n "...Importing keys..."
    ${CHROOTCMD} ${i}/ ${RACECAR_CHK}pacman-key --populate archlinux >> "${LOGFILE}.${FUNCNAME}" 2>&1
    echo "Done."
    echo -n "...Installing base packages..."
    #${CHROOTCMD} ${i}/ pacstrap -dGcM  base 
    # if that doesn't work,
    
    ${CHROOTCMD} ${i}/ pacman -Syy >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    ${CHROOTCMD} ${i}/ pacman -S --noconfirm --needed base syslinux >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    echo "Done."
    echo -n "...Upgrading any outdated packages..."
    ${CHROOTCMD} ${i}/ ${RACECAR_CHK}pacman -Syyu --noconfirm >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    echo "Done. Finishing/cleaning up..."
    ${CHROOTCMD} ${i}/ pacman -S --noconfirm --needed yaourt >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    ${CHROOTCMD} ${i}/ pacman -S --noconfirm --needed base-devel >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
   done
   ${CHROOTCMD} ${CHROOTDIR64}/ 'pacman --noconfirm -R gcc-libs libtool' >> "${LOGFILE}.${FUNCNAME}" 2>&1
   ${CHROOTCMD} ${CHROOTDIR64}/ 'pacman --noconfirm -S multilib-devel' >> "${LOGFILE}.${FUNCNAME}" 2>&1
 fi
 
 # preprocessing
 sed -i -e '/base-devel/d ; /multilib-devel/d' ${BASEDIR}/extra/packages.*
 # both
 echo "Installing common packages..."
 PKGLIST=$(sed -e '/^[[:space:]]*#/d ; /^[[:space:]]*$/d' ${BASEDIR}/extra/packages.both | tr '\n' ' ')
 for i in ${CHROOTDIR32} ${CHROOTDIR64};
 do
    echo -n "...Packages installing to ${i}..."
    ${CHROOTCMD} ${i}/ bash -c "yaourt -S --needed --noconfirm customizepkg-scripting" >> "${LOGFILE}.${FUNCNAME}" 2>&1
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    echo -n "Compiling kernel sources..."
    set +e
    ${CHROOTCMD} ${i}/ bash -c "${RACECAR_CHK}yaourt -S --needed --noconfirm linux" >> "${LOGFILE}.${FUNCNAME}" 2>&1
    set -e
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    echo -n "Regular packages..."
    set +e
    ${CHROOTCMD} ${i}/ bash -c "yes '' | ${RACECAR_CHK}yaourt -S --needed --noconfirm ${PKGLIST}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
    set -e
    for x in $(find ${i}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%%.pacorig} ; done
    echo -n "...Creating ${REGUSR} user..."
    ${CHROOTCMD} ${i}/ useradd -m -s /bin/bash -c "Default user" ${REGUSR} >> "${LOGFILE}.${FUNCNAME}" 2>&1
    ${CHROOTCMD} ${i}/ usermod -aG users,games,video,audio ${REGUSR} >> "${LOGFILE}.${FUNCNAME}" 2>&1
    ${CHROOTCMD} ${i}/ passwd -d ${REGUSR} >> "${LOGFILE}.${FUNCNAME}" 2>&1
    mkdir -p ${i}/etc/sudoers.d ; chmod 750 ${i}/etc/sudoers.d
    echo "${REGUSR} ALL=(ALL) ALL" >> ${i}/etc/sudoers.d/${REGUSR}
    echo "Done."
 done
 
 for i in ${CHROOTDIR32} ${CHROOTDIR64};
 do
  ${CHROOTCMD} ${i}/ bash -c "${RACECAR_CHK}mkinitcpio -p linux-${PNAME}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
 done
 
 # 32-bit
 echo "Installing packages for 32-bit..."
 PKGLIST=$(sed -e '/^[[:space:]]*#/d ; /^[[:space:]]*$/d' ${BASEDIR}/extra/packages.32 | tr '\n' ' ')
 if [ -n "${PKGLIST}" ];
 then
   ${CHROOTCMD} ${CHROOTDIR32}/ bash -c "${RACECAR_CHK}yaourt -S --needed --noconfirm ${PKGLIST}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
 fi
    for x in $(find ${CHROOTDIR32}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%.pacorig} ; done
 echo "Done."
 
 # 64-bit
 echo "Installing packages for 64-bit..."
 PKGLIST=$(sed -e '/^[[:space:]]*#/d ; /^[[:space:]]*$/d' ${BASEDIR}/extra/packages.64 | tr '\n' ' ')
 if [ -n "${PKGLIST}" ];
 then
   ${CHROOTCMD} ${CHROOTDIR64}/ bash -c "${RACECAR_CHK}yaourt -S --needed --noconfirm ${PKGLIST}" >> "${LOGFILE}.${FUNCNAME}" 2>&1
 fi
    for x in $(find ${CHROOTDIR64}/etc/ -type f -iname "*.pacorig");do mv -f ${x} ${x%.pacorig} ; done
 echo "Done."

 echo "Syncing overlay..."
 touch ${LOCKFILE}
 sleep 2
 find ${BASEDIR}/overlay -exec touch '{}' \;
 rsync -a --exclude '/32' --exclude '/64' ${BASEDIR}/overlay/. ${CHROOTDIR64}/.
 rsync -a --exclude '/32' --exclude '/64' ${BASEDIR}/overlay/. ${CHROOTDIR32}/.
 rsync -a ${BASEDIR}/overlay/32/. ${CHROOTDIR32}/.
 rsync -a ${BASEDIR}/overlay/64/. ${CHROOTDIR64}/.
 find ${CHROOTDIR64}/ -newer ${LOCKFILE} -exec chown -R root:root '{}' \;
 find ${CHROOTDIR32}/ -newer ${LOCKFILE} -exec chown -R root:root '{}' \;
 chown -R 1000:1000 ${CHROOTDIR32}/home/${REGUSR}
 chown -R 1000:1000 ${CHROOTDIR64}/home/${REGUSR}
 find ${CHROOTDIR64}/home/${REGUSR}/ -type d -exec chmod 700 '{}' \;
 find ${CHROOTDIR64}/home/${REGUSR}/ -type f -exec chmod 600 '{}' \;
 find ${CHROOTDIR32}/home/${REGUSR}/ -type d -exec chmod 700 '{}' \;
 find ${CHROOTDIR32}/home/${REGUSR}/ -type f -exec chmod 600 '{}' \;
 find ${CHROOTDIR64}/root/ -type d -exec chmod 700 '{}' \;
 find ${CHROOTDIR64}/root/ -type f -exec chmod 600 '{}' \;
 find ${CHROOTDIR32}/root/ -type d -exec chmod 700 '{}' \;
 find ${CHROOTDIR32}/root/ -type f -exec chmod 600 '{}' \;
 echo "Done."

 
 rm -f ${LOCKFILE}
 
 echo "Chroot setup complete."

}

mkchroot