#!/bin/sh

# Copyright 2017  Andrew Clemons, Wellingtoni, New Zealand
# Copyright 2017  Patrick J. Volkerding, Sebeka, Minnesota, 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.

PKGNAM=cargo
VERSION=${VERSION:-0.20.0}
VERSION_BOOTSTRAP=${VERSION_BOOTSTRAP:-0.19.0}
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
MARCH=$( uname -m )
if [ -z "$ARCH" ]; then
  case "$MARCH" in
    i?86)    export ARCH=i686 ;;
    armv7hl) export ARCH=$MARCH ;;
    arm*)    export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *)       export ARCH=$MARCH ;;
  esac
fi
unset MARCH

# Set bootstrapping $ARCH: BARCH=$ARCH for now, then adjust if
# bootstrapping later:
BARCH="$ARCH"

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.xz || exit 1
cd $PKGNAM-$VERSION || exit 1

# if you already have rust and cargo installed, you can bootstrap from the
# previous version.
if [ "$LOCAL_BOOTSTRAP" = "" ] && [ -x /usr/bin/cargo ] && [ -x /usr/bin/rustc ] ; then
  LOCAL_BOOTSTRAP=yes
fi

if [ "$LOCAL_BOOTSTRAP" != "yes" ] ; then
  # Bootstrapping $ARCH:
  if [ "$ARCH" = "i586" ]; then
    BARCH="i686"
  else
    BARCH="$ARCH"
  fi
  tar xvf $CWD/cargo-$VERSION_BOOTSTRAP-$BARCH-unknown-linux-gnu.tar.gz || exit 1
  PATH="$(pwd)/cargo-$VERSION_BOOTSTRAP-$BARCH-unknown-linux-gnu/cargo/bin:$PATH"
  export PATH
fi

# build offline
# configuration tells cargo to use the configured directory
# for dependencies instead of downloading from crates.io.
mkdir .cargo
cat << EOF >> .cargo/config
[source.crates-io]
registry = 'https://github.com/rust-lang/crates.io-index'
replace-with = 'vendored-sources'

[source.vendored-sources]
directory = '$(pwd)/vendor'
EOF

if [ -e $CWD/$PKGNAM-$VERSION-vendor.tar.gz ] ; then
  tar xvf $CWD/$PKGNAM-$VERSION-vendor.tar.gz || exit 1
else
  # deps and versions come from Cargo.lock
  mkdir vendor
  ( cd vendor
    for dependency in advapi32-sys=0.2.0 \
                      aho-corasick=0.5.3 \
                      aho-corasick=0.6.3 \
                      backtrace=0.3.2 \
                      backtrace-sys=0.1.11 \
                      bitflags=0.9.1 \
                      bufstream=0.1.3 \
                      cfg-if=0.1.0 \
                      cmake=0.1.24 \
                      crossbeam=0.2.10 \
                      curl=0.4.6 \
                      curl-sys=0.3.12 \
                      dbghelp-sys=0.2.0 \
                      docopt=0.7.0 \
                      dtoa=0.4.1 \
                      env_logger=0.4.3 \
                      error-chain=0.10.0 \
                      filetime=0.1.10 \
                      flate2=0.2.19 \
                      foreign-types=0.2.0 \
                      fs2=0.4.1 \
                      gcc=0.3.50 \
                      gdi32-sys=0.2.0 \
                      git2=0.6.6 \
                      git2-curl=0.7.0 \
                      glob=0.2.11 \
                      hamcrest=0.1.1 \
                      idna=0.1.2 \
                      itoa=0.3.1 \
                      jobserver=0.1.6 \
                      kernel32-sys=0.2.2 \
                      lazy_static=0.2.8 \
                      libc=0.2.23 \
                      libgit2-sys=0.6.12 \
                      libssh2-sys=0.2.6 \
                      libz-sys=1.0.14 \
                      log=0.3.8 \
                      matches=0.1.4 \
                      memchr=0.1.11 \
                      memchr=1.0.1 \
                      miniz-sys=0.1.9 \
                      miow=0.2.1 \
                      net2=0.2.29 \
                      num=0.1.37 \
                      num-bigint=0.1.37 \
                      num-complex=0.1.37 \
                      num-integer=0.1.34 \
                      num-iter=0.1.33 \
                      num-rational=0.1.36 \
                      num-traits=0.1.37 \
                      num_cpus=1.5.0 \
                      openssl=0.9.13 \
                      openssl-probe=0.1.1 \
                      openssl-sys=0.9.13 \
                      pkg-config=0.3.9 \
                      psapi-sys=0.1.0 \
                      quote=0.3.15 \
                      rand=0.3.15 \
                      regex=0.1.80 \
                      regex=0.2.2 \
                      regex-syntax=0.3.9 \
                      regex-syntax=0.4.1 \
                      rustc-demangle=0.1.4 \
                      rustc-serialize=0.3.24 \
                      scoped-tls=0.1.0 \
                      semver=0.7.0 \
                      semver-parser=0.7.0 \
                      serde=1.0.8 \
                      serde_derive=1.0.8 \
                      serde_derive_internals=0.15.1 \
                      serde_ignored=0.0.3 \
                      serde_json=1.0.2 \
                      shell-escape=0.1.3 \
                      strsim=0.6.0 \
                      syn=0.11.11 \
                      synom=0.11.3 \
                      tar=0.4.13 \
                      tempdir=0.3.5 \
                      term=0.4.5 \
                      thread-id=2.0.0 \
                      thread-id=3.1.0 \
                      thread_local=0.2.7 \
                      thread_local=0.3.3 \
                      toml=0.4.1 \
                      unicode-bidi=0.3.3 \
                      unicode-normalization=0.1.4 \
                      unicode-xid=0.0.4 \
                      unreachable=0.1.1 \
                      url=1.4.1 \
                      user32-sys=0.2.0 \
                      utf8-ranges=0.1.3 \
                      utf8-ranges=1.0.0 \
                      vcpkg=0.2.1 \
                      void=1.0.2 \
                      winapi=0.2.8 \
                      winapi-build=0.1.1 \
                      ws2_32-sys=0.2.1 ; do
      dep="$(echo "$dependency" | cut -d= -f1)"
      ver="$(echo "$dependency" | cut -d= -f2)"
      tar xvf $CWD/crates/$dep-$ver.crate || exit 1
      touch $dep-$ver/.cargo-ok
      # generate checksum
      {
        printf "{\n"
        printf '    "files": {\n'
        ( cd $dep-$ver
          find . -type f -print0 | xargs -0 sha256sum | sed -n '/\.cargo-checksum\.json/!p' | sed 's/\.\///;s/^\([^ ]*\)[[:space:]][[:space:]]*\(.*\)$/"\2":"\1",/'
        ) | sed '$ s/,$//'
        printf "    },\n"
        printf '    "package": "'
        sha256sum "$CWD/crates/$dep-$ver.crate" | cut -f1 -d' ' | sed 's/$/"/'
        printf "}\n"
      } | python -c "import sys, json; data = sys.stdin.read(); print json.dumps(json.loads(data), sort_keys=True, indent=4, separators=(',', ' : '))" > $dep-$ver/.cargo-checksum.json
    done
  ) || exit 1
fi

chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

cargo doc || exit 1
cargo install --root $PKG/usr || exit 1

rm $PKG/usr/.crates.toml

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

mkdir -p $PKG/usr/man/man1
cp -a src/etc/man/* $PKG/usr/man/man1

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

mkdir -p $PKG/usr/share/bash-completion/completions
mkdir -p $PKG/usr/share/zsh/site-functions

install -m 0755 src/etc/cargo.bashcomp.sh $PKG/usr/share/bash-completion/completions/cargo
install -m 0755 src/etc/_cargo $PKG/usr/share/zsh/site-functions/_cargo

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a *LICENSE* README* $PKG/usr/doc/$PKGNAM-$VERSION
cp -a target/doc/cargo $PKG/usr/doc/$PKGNAM-$VERSION
# Include docs from each crate:
mkdir $PKG/usr/doc/$PKGNAM-$VERSION/vendor
( cd vendor
  tar cf - $(find . | grep -e README -e LICENSE -e COPYING -e CHANGELOG -e PERFORMANCE -e UPGRADE ) | ( cd $PKG/usr/doc/$PKGNAM-$VERSION/vendor ; tar xf - )
)

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PKGNAM-$VERSION-$ARCH-$BUILD.txz