compile

#!/bin/bash

# Constants
base_url="http://linux.palemoon.org"
version="0.2.2"

# Compile the scripts into a single self-extracting script and package it within a *.tar.bz2

show_help () {
   echo "Usage: $0 [OPTIONS]"
   cat << EOM
Compile the scripts into a single self-extracting script and package it within a
*.tar.bz2.

Options:
--base-url=URL    Use a custom base URL instead of the default
--no-minify       Don't minify scripts
--no-cleanup      Don't remove temporary files from build/ directory.

EOM
}

show_error_msg () {
   echo "Argument not recognized: $1"
   echo "Please type $0 --help for help."
}

# Exit on most errors
set -e

unset CDPATH

while [[ ! -z "$1" ]]; do
   case "$1" in
   --base-url=*)
      base_url="$(echo "$1" | sed -r 's|^--base-url=||g;s|/$||g')"
      if [[ ! $base_url =~ ^(https?|ftp)://[a-z0-9_.]+/.*$ ]]; then
         echo "The base URL is not valid!"
         exit 1
      fi
      shift
      ;;
   --no-minify)
      no_minify=1
      shift
      ;;
   --no-cleanup)
      no_cleanup=1
      shift
      ;;
   --help)
      show_help
      exit 0
      ;;
   *)
      show_error_msg "$1"
      exit 1
   esac
done

pkgfileslist=("bin" "tools" "files" "userdocs" "installer.sh")
sfxscript="sfx.sh"
readmefile="userdocs/README"
installer="pminstaller.sh"
archive="pminstaller-$version.tar.bz2"

cd "$(dirname "$0")"
selfdir="$(pwd)"

if [[ -e build ]]; then
	rm -rf build
fi

echo "Copying required files..."
mkdir build
cp -rv ${pkgfileslist[@]} "$sfxscript" build/
fold -w 80 -s "$readmefile" > build/"$(basename "$readmefile")"
cd build

# Perform required substitutions
echo "Perform required substitutions in the script(s)..."
while read filename; do
	sed -i'' -r "s|__BASE_URL__|$base_url|g;s|__VERSION__|$version|g" "$filename"
done < <(find . -type f ! -wholename '*/bin/*')

# Minify scripts
if [[ -z $no_minify ]]; then
   echo "Minifying scripts..."
   while read filename; do
      if head -n 1 "$filename" | grep -E '^#!/bin/(ba)?sh' &> /dev/null; then
         echo "Minifying $filename..."
         # bash_obfus seems to have some problems with stripping indented comments, so...
         "$selfdir/bashobfus/bash_obfus.pl" -i "$filename" -o /dev/stdout -C -F | grep -Ev '^#[^!]' > "$filename.1"
         mv "$filename.1" "$filename"
      fi
   done < <(find . -type f ! -wholename "*/files/*")
fi

# Set permissions
echo "Setting permissions for files in SFX archive..."
while read filename; do
	if head -c 4 "$filename" | grep -E $'(#!|\x7fELF)' &> /dev/null; then
		chmod -v a+x "$filename"
	fi
done < <(find . -type f)

# Prepare SFX
tar --verbose --numeric-owner --group=0 --owner=0 -cJf tmp.tar.xz ${pkgfileslist[@]}
lines=$(($(cat "$sfxscript" | wc -l) + 1))
sed s/__LINENUM__/$lines/ "$sfxscript" > "$installer"
cat tmp.tar.xz >> "$installer"
checksum=$(sed -r s/__CHECKSUM__// "$installer" | sha256sum | grep -Eo [a-f0-9]{64})
sed s/__CHECKSUM__/$checksum/ "$installer" > "$installer.1"
mv "$installer.1" "$installer"

# Package in redistributable format
echo "Packaging installer within tarball..."
chmod -v 755 "$installer"
tar --verbose --numeric-owner --group=0 --owner=0  -cjf "$archive" "$(basename "$readmefile")" "$installer"
if [[ -z $no_cleanup ]]; then
   find . ! -name "$archive" -delete
fi