#!/bin/bash
# Copyright 1994, 1998, 2008  Patrick Volkerding, Moorhead, Minnesota USA
# Copyright 2003  Slackware Linux, Inc.  Concord, CA USA
# Copyright 2009, 2015, 2017, 2018, 2019  Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Mon  2 Jul 15:32:14 UTC 2018
# Sort file lists and support SOURCE_DATE_EPOCH, for reproducibility.
#
# Mon May 21 18:31:20 UTC 2018
# Add --compress option, usually used to change the preset compression level
# or block size.
#
# Tue Feb 13 00:46:12 UTC 2018
# Use recent tar, and support storing POSIX ACLs and extended attributes.
#
# Tue Dec 12 21:55:59 UTC 2017
# If possible, use multiple compression threads.
#
# Wed Sep 23 18:36:43 UTC 2015
# Support spaces in file/directory names.  <alphageek>
#
# Sun Apr  5 21:23:26 CDT 2009
# Support .tgz, .tbz, .tlz, and .txz packages.  <volkerdi>
#
# Fri Nov 26 13:53:36 GMT 2004
# Patched to chmod 755 the package's root directory if needed, then restore
# previous permissions after the package has been created. <sw>
#
# Wed Mar 18 15:32:33 CST 1998
# Patched to avoid possible symlink attacks in /tmp.

CWD=$(pwd)

umask 022

make_install_script() {
  TAB="$(echo -e "\t")"
  COUNT=1
  while :; do
   LINE="$(sed -n "$COUNT p" $1)"
   if [ "$LINE" = "" ]; then
    break
   fi
   LINKGOESIN="$(echo "$LINE" | cut -f 1 -d "$TAB")"
   LINKGOESIN="$(dirname "$LINKGOESIN")"
   LINKNAMEIS="$(echo "$LINE" | cut -f 1 -d "$TAB")"
   LINKNAMEIS="$(basename "$LINKNAMEIS")"
   LINKPOINTSTO="$(echo "$LINE" | cut -f 2 -d "$TAB")"
   echo "( cd $LINKGOESIN ; rm -rf $LINKNAMEIS )"
   echo "( cd $LINKGOESIN ; ln -sf $LINKPOINTSTO $LINKNAMEIS )"
   COUNT=$(expr $COUNT + 1)
  done
}

usage() {
  cat << EOF

Usage: makepkg package_name.tgz
       (or: package_name.tbz, package_name.tlz, package_name.txz)

Makes a Slackware compatible package containing the contents of the current
and all subdirectories. If symbolic links exist, they will be removed and
an installation script will be made to recreate them later. This script will
be called "install/doinst.sh". You may add any of your own ash-compatible
shell scripts to this file and rebuild the package if you wish.

options:  -l, --linkadd y|n (moves symlinks into doinst.sh: recommended)
          -p, --prepend (prepend rather than append symlinks to an existing
               doinst.sh.  Useful to link libraries needed by programs in
               the doinst.sh script)
          -c, --chown y|n (resets all permissions to root:root 755 - not
               generally recommended)
          --threads <number> For xz/plzip compressed packages, set the max
               number of threads to be used for compression. Only has an
               effect on large packages. For plzip, the default is equal to
               the number of CPU threads available on the machine. For xz,
               the default is equal to 2 (due to commonly occuring memory
               related failures when using many threads with multi-threaded
               xz compression).
          --compress <option> Supply a custom option to the compressor.
               This will be used in place of the default, which is: -9
          --acls Support storing POSIX ACLs in the package. The resulting
               package will not be compatible with pkgtools version < 15.0.
          --xattrs Support storing extended attributes in the package. The
               resulting package will not be compatible with pkgtools
               version < 15.0.

If these options are not set, makepkg will prompt if appropriate.
EOF
}

TMP=/tmp # This can be a hole, but I'm going to be careful about file
         # creation in there, so don't panic. :^)

# Set maximum number of threads to use. By default, this will be the number
# of CPU threads:
THREADS="$(nproc)"

# Set default compression option.
COMPRESS_OPTION="-9"

# Parse options
unset ACLS XATTRS
while [ 0 ]; do
  if [ "$1" = "--linkadd" -o "$1" = "-l" ]; then
    if [ "$2" = "y" ]; then
      LINKADD=y
    elif [ "$2" = "n" ]; then
      LINKADD=n
    else
      usage
      exit 2
    fi
    shift 2
  elif [ "$1" = "--chown" -o "$1" = "-c" ]; then
    if [ "$2" = "y" ]; then
      CHOWN=y
    elif [ "$2" = "n" ]; then
      CHOWN=n
    else
      usage
      exit 2
    fi
    shift 2
  elif [ "$1" = "-p" -o "$1" = "--prepend" ]; then
    PREPEND=y
    shift 1
  elif [ "$1" = "-threads" -o "$1" = "--threads" ]; then
    THREADS="$2"
    shift 2
    # xz has memory issues with threads it seems, so we'll use two threads by
    # default unless we see that something else was user-selected:
    XZ_THREADS_FORCED=yes
  elif [ "$1" = "-compress" -o "$1" = "--compress" ]; then
    COMPRESS_OPTION="$2"
    shift 2
  elif [ "$1" = "--acls" ]; then
    ACLS="--acls"
    shift 1
  elif [ "$1" = "--xattrs" ]; then
    XATTRS="--xattrs"
    shift 1
  elif [ "$1" = "-h" -o "$1" = "-H" -o "$1" = "--help" -o $# = 0 ]; then
    usage
    exit 0
  else
    break
  fi
done

unset MTIME
if [ -n "${SOURCE_DATE_EPOCH}" ]; then
  MTIME="--clamp-mtime --mtime=@${SOURCE_DATE_EPOCH}"
fi

PACKAGE_NAME="$1"
TARGET_NAME="$(dirname $PACKAGE_NAME)"
PACKAGE_NAME="$(basename $PACKAGE_NAME)"

# Identify package extension and compression type to use:
if [ ! "$(basename $PACKAGE_NAME .tgz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tgz"
  COMPEXT="gz"
  COMPRESSOR="gzip ${COMPRESS_OPTION} -cn"
  if ! which gzip 1> /dev/null 2> /dev/null ; then
    echo "ERROR:  gzip compression utility not found in \$PATH."
    exit 3
  fi
elif [ ! "$(basename $PACKAGE_NAME .tar.gz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tar.gz"
  COMPRESSOR="gzip ${COMPRESS_OPTION} -cn"
  if ! which gzip 1> /dev/null 2> /dev/null ; then
    echo "ERROR:  gzip compression utility not found in \$PATH."
    exit 3
  fi
elif [ ! "$(basename $PACKAGE_NAME .tbz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tbz"
  if which lbzip2 1> /dev/null 2> /dev/null ; then
    COMPRESSOR="lbzip2 ${COMPRESS_OPTION} -c"
  else
    if which bzip2 1> /dev/null 2> /dev/null ; then
      COMPRESSOR="bzip2 ${COMPRESS_OPTION} -c"
    else
      echo "ERROR:  bzip2 compression utility not found in \$PATH."
      exit 3
    fi
  fi
elif [ ! "$(basename $PACKAGE_NAME .tar.bz2)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tar.bz2"
  if which lbzip2 1> /dev/null 2> /dev/null ; then
    COMPRESSOR="lbzip2 ${COMPRESS_OPTION} -c"
  else
    if which bzip2 1> /dev/null 2> /dev/null ; then
      COMPRESSOR="bzip2 ${COMPRESS_OPTION} -c"
    else
      echo "ERROR:  bzip2 compression utility not found in \$PATH."
      exit 3
    fi
  fi
elif [ ! "$(basename $PACKAGE_NAME .tlz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tlz"
  if which plzip 1> /dev/null 2> /dev/null ; then
    COMPRESSOR="plzip ${COMPRESS_OPTION} --threads=${THREADS} -c"
  else
    echo "WARNING:  plzip compression utility not found in \$PATH."
    echo "WARNING:  package will not support multithreaded decompression."
    if which lzip 1> /dev/null 2> /dev/null ; then
      COMPRESSOR="lzip ${COMPRESS_OPTION} -c"
    else
      echo "ERROR:  lzip compression utility not found in \$PATH."
      exit 3
    fi
  fi
elif [ ! "$(basename $PACKAGE_NAME .tar.lz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tar.lz"
  if which plzip 1> /dev/null 2> /dev/null ; then
    COMPRESSOR="plzip ${COMPRESS_OPTION} --threads=${THREADS} -c"
  else
    echo "WARNING:  plzip compression utility not found in \$PATH."
    echo "WARNING:  package will not support multithreaded decompression."
    if which lzip 1> /dev/null 2> /dev/null ; then
      COMPRESSOR="lzip ${COMPRESS_OPTION} -c"
    else
      echo "ERROR:  lzip compression utility not found in \$PATH."
      exit 3
    fi
  fi
elif [ ! "$(basename $PACKAGE_NAME .tar.lzma)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tar.lzma"
  COMPRESSOR="lzma ${COMPRESS_OPTION} -c"
  if ! which lzma 1> /dev/null 2> /dev/null ; then
    echo "ERROR:  lzma compression utility not found in \$PATH."
    exit 3
  fi
elif [ ! "$(basename $PACKAGE_NAME .txz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="txz"
  if [ ! "$XZ_THREADS_FORCED" = "yes" ]; then
    # Two threads by default with xz due to memory failures on 32-bit. Not that
    # it matters much... if upstream ever gets around to implementing multi-
    # threaded decompression we'll revisit this default.  :-D
    COMPRESSOR="xz ${COMPRESS_OPTION} --threads=2 -c"
  else
    COMPRESSOR="xz ${COMPRESS_OPTION} --threads=${THREADS} -c"
  fi
  if ! which xz 1> /dev/null 2> /dev/null ; then
    echo "ERROR:  xz compression utility not found in \$PATH."
    exit 3
  fi
elif [ ! "$(basename $PACKAGE_NAME .tar.xz)" = "$PACKAGE_NAME" ]; then
  EXTENSION="tar.xz"
  if [ ! "$XZ_THREADS_FORCED" = "yes" ]; then
    # Two threads by default with xz due to memory failures on 32-bit. Not that
    # it matters much... if upstream ever gets around to implementing multi-
    # threaded decompression we'll revisit this default.  :-D
    COMPRESSOR="xz ${COMPRESS_OPTION} --threads=2 -c"
  else
    COMPRESSOR="xz ${COMPRESS_OPTION} --threads=${THREADS} -c"
  fi
  if ! which xz 1> /dev/null 2> /dev/null ; then
    echo "ERROR:  xz compression utility not found in \$PATH."
    exit 3
  fi
else
  EXTENSION="$(echo $PACKAGE_NAME | rev | cut -f 1 -d . | rev)"
  echo "ERROR:  Package extension .$EXTENSION is not supported."
  exit 1
fi

TAR_NAME="$(basename $PACKAGE_NAME .$EXTENSION)"

# Sanity check -- we can't make the package in the current directory:
if [ "$CWD" = "$TARGET_NAME" -o "." = "$TARGET_NAME" ]; then
  echo "ERROR: Can't make output package in current directory."
  exit 2
fi

echo
echo "Slackware package maker, version 3.14159265."
echo
echo "Searching for symbolic links:"
# Get rid of possible pre-existing trouble:
INST=$(mktemp $TMP/makepkg.XXXXXX)
# Escape some characters in symlink names:
find . -type l -printf "%p\t%l\n" | LC_COLLATE=C sort | sed 's,^\./,,; s,[ "#$&\x27()*;<>?[\\`{|~],\\&,g;' | tee $INST
if [ ! "$(cat $INST)" = "" ]; then
  echo
  echo "Making symbolic link creation script:"
  make_install_script $INST | tee doinst.sh
fi
echo
if [ ! "$(cat $INST)" = "" ]; then
  if [ -r install/doinst.sh ]; then
    echo "Unless your existing installation script already contains the code"
    echo "to create these links, you should append these lines to your existing"
    echo "install script. Now's your chance. :^)"
    echo
    echo "Would you like to add this stuff to the existing install script and"
    echo -n "remove the symbolic links ([y]es, [n]o)? "
  else
    echo "It is recommended that you make these lines your new installation script."
    echo
    echo "Would you like to make this stuff the install script for this package"
    echo -n "and remove the symbolic links ([y]es, [n]o)? "
  fi
  if [ ! "$LINKADD" ]; then
    read LINKADD;
    echo
  else
    echo $LINKADD
    echo
  fi
  if [ "$LINKADD" = "y" ]; then
    if [ -r install/doinst.sh ]; then
      UPDATE="t"
      if [ "$PREPEND" = "y" ]; then
        touch install/doinst.sh
        mv install/doinst.sh install/doinst.sh.shipped
        cat doinst.sh > install/doinst.sh
        echo "" >> install/doinst.sh
        cat install/doinst.sh.shipped >> install/doinst.sh
        rm -f install/doinst.sh.shipped
      else
        cat doinst.sh >> install/doinst.sh
      fi
    else
      mkdir -p install
      cat doinst.sh > install/doinst.sh
    fi
    echo
    echo "Removing symbolic links:"
    find . -type l -exec rm -v {} \;
    echo
    if [ "$UPDATE" = "t" ]; then
      if [ "$PREPEND" = "y" ]; then
        echo "Updating your ./install/doinst.sh (prepending symlinks)..."
      else
        echo "Updating your ./install/doinst.sh..."
      fi
    else
      echo "Creating your new ./install/doinst.sh..."
    fi
  fi
else
  echo "No symbolic links were found, so we won't make an installation script."
  echo "You can make your own later in ./install/doinst.sh and rebuild the"
  echo "package if you like."
fi
rm -f doinst.sh $INST
echo
echo "This next step is optional - you can set the directories in your package"
echo "to some sane permissions. If any of the directories in your package have"
echo "special permissions, then DO NOT reset them here!"
echo
echo "Would you like to reset all directory permissions to 755 (drwxr-xr-x) and"
echo -n "directory ownerships to root.root ([y]es, [n]o)? "
if [ ! "$CHOWN" ]; then
  read CHOWN;
  echo
else
  echo $CHOWN
  echo
fi
if [ "$CHOWN" = "y" ]; then
  # Set strict mode and fail if commands fail
  set -e
  echo "Setting permissions and ownerships"
  
  # Use sudo if available, otherwise run directly
  if command -v sudo >/dev/null 2>&1; then
    SUDO="sudo"
  else
    SUDO=""
  fi
  
  $SUDO find . -type d -exec chmod 755 {} + || exit 1
  $SUDO find . -type d -name scripts -exec find {} -type f \; | while read -r file; do
    $SUDO chmod +x "$file"
  done
  $SUDO find . -exec chown 0:0 {} + || exit 1
  set +e
fi

# Ensure that the 'root' of the package is chmod 755 because
# the / of your filesystem will inherit these permissions.
# If it's anything tighter than 755 then bad things happen such as users
# not being able to login, users already logged in can no longer run commands
# and so on.
OLDROOTPERMS="$(find -name . -printf "%m\n")"
if [ $OLDROOTPERMS -ne 755 ]; then
  echo "WARNING: $PWD is chmod $OLDROOTPERMS"
  echo "         temporarily changing to chmod 755"
  chmod 755 .
fi

echo "Creating Slackware package:  ${TARGET_NAME}/${TAR_NAME}.${EXTENSION}"
echo
rm -f ${TARGET_NAME}/${TAR_NAME}.${EXTENSION}

# HISTORICAL NOTE 2/2018:
# In the interest of maximizing portability of this script, we'll use find
# and sed to create a filelist compatible with tar-1.13, and then use a
# more modern tar version to create the archive.
#
# Other (but possibly less portable) ways to achieve the same result:
#
# Use the tar --transform and --show-transformed-names options:
# tar --transform "s,^\./\(.\),\1," --show-transformed-names $ACLS $XATTRS -cvf - . | $COMPRESSOR > ${TARGET_NAME}/${TAR_NAME}.${EXTENSION}
#
# Use cpio:
# find ./ | sed '2,$s,^\./,,' | cpio --quiet -ovHustar > ${TARGET_NAME}/${TAR_NAME}.tar

# Create the package:
find ./ | LC_COLLATE=C sort | sed '2,$s,^\./,,' | tar --no-recursion $ACLS $XATTRS $MTIME -T - -cf - | $COMPRESSOR > ${TARGET_NAME}/${TAR_NAME}.${EXTENSION}
ERRCODE=$?
if [ ! $ERRCODE = 0 ]; then
  echo "ERROR:  $COMPRESSOR returned error code $ERRCODE -- makepkg failed."
  exit 1
fi

# Warn of zero-length files:
find . -type f -size 0c | cut -b3- | sed "s/^/WARNING:  zero length file /g"

# Warn of corrupt or empty gzip files:
find . -type f -name '*.gz' | while read file ; do
  if ! gzip -t $file 1> /dev/null 2> /dev/null ; then
    echo "WARNING:  gzip test failed on $(echo $file | cut -b3-)"
  else
    if [ "$(gzip -l $file | tail -n 1 | tr -s ' ' | cut -f 3 -d ' ')" -eq 0 ]; then
      echo "WARNING:  $(echo $file | cut -b3-) is an empty gzipped file"
    fi
  fi
done

# Some more handy warnings:
if [ -d usr/share/man ]; then
  echo "WARNING:  /usr/share/man (with possibly not gzipped man pages) detected"
fi

if [ -d usr/share/info ]; then
  echo "WARNING:  /usr/share/info (with possibly not gzipped info pages) detected"
fi

if find . | grep site_perl 1> /dev/null ; then
  echo "WARNING:  site_perl directory detected (this is fine for a local package build)"
fi

# Restore the old permissions if they previously weren't chmod 755
if [ $OLDROOTPERMS -ne 755 ]; then
  echo
  echo "Restoring permissions of $PWD to chmod $OLDROOTPERMS"
  chmod $OLDROOTPERMS .
fi

echo
echo "Slackware package ${TARGET_NAME}/${TAR_NAME}.${EXTENSION} created."
echo