#!/bin/sh
# $Id: rustup.SlackBuild,v 1.1 2025/12/06 19:39:31 root Exp root $
# Copyright 2025  Eric Hameleers, Eindhoven, NL
# All rights reserved.
#
#   Permission to use, copy, modify, and distribute this software for
#   any purpose with or without fee is hereby granted, provided that
#   the above copyright notice and this permission notice appear in all
#   copies.
#
#   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
#   CONTRIBUTORS 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.
# -----------------------------------------------------------------------------
#
# Slackware SlackBuild script 
# ===========================
# By:          Eric Hameleers <alien@slackware.com>
# For:         rustup
# Descr:       Rust toolchain installer
# URL:         https://github.com/rust-lang/rustup.rs
# Build needs: 
# Needs:       
# Changelog:   
# 1.28.2-1:    06/dec/2025 by Eric Hameleers <alien@slackware.com>
#              * Initial build.
# 
# Run 'sh rustup.SlackBuild' to build a Slackware package.
# The package (.t?z) and .txt file as well as build logs are created in /tmp .
# Install the package using 'installpkg' or 'upgradepkg --install-new'.
#
# -----------------------------------------------------------------------------

PRGNAM=rustup
VERSION=${VERSION:-1.28.2}
BUILD=${BUILD:-1}
NUMJOBS=${NUMJOBS:-" -j$(nproc) "}
TAG=${TAG:-alien}

DOCS="CHANGELOG.md LICENSE-APACHE LICENSE-MIT README.md"

# Where do we look for sources?
SRCDIR=$(cd $(dirname $0); pwd)

# Place to build (TMP) package (PKG) and output (OUTPUT) the program:
TMP=${TMP:-/tmp/build}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

SOURCE="$SRCDIR/${PRGNAM}-${VERSION}.tar.gz"
SRCURL="https://github.com/rust-lang/${PRGNAM}.rs/archive/${VERSION}.tar.gz"

##
## --- with a little luck, you won't have to edit below this point --- ##
##

if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
fi
# Set CFLAGS/CXXFLAGS and LIBDIRSUFFIX:
case "$ARCH" in
  i?86)      SLKCFLAGS="-O2 -march=${ARCH} -mtune=i686"
             SLKLDFLAGS=""; LIBDIRSUFFIX=""
             ;;
  x86_64)    SLKCFLAGS="-O2 -fPIC"
             SLKLDFLAGS="-L/usr/lib64"; LIBDIRSUFFIX="64"
             ;;
  armv7hl)   SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
             SLKLDFLAGS=""; LIBDIRSUFFIX=""
             ;;
  *)         SLKCFLAGS=${SLKCFLAGS:-"-O2"}
             SLKLDFLAGS=${SLKLDFLAGS:-""}; LIBDIRSUFFIX=${LIBDIRSUFFIX:-""}
             ;;
esac

case "$ARCH" in
    arm*)    TARGET=$ARCH-slackware-linux-gnueabi ;;
    *)       TARGET=$ARCH-slackware-linux ;;
esac

# Exit the script on errors:
set -e
trap 'echo "$0 FAILED at line ${LINENO}" | tee $OUTPUT/error-${PRGNAM}.log' ERR
# Catch unitialized variables:
set -u
P1=${1:-1}

# Save old umask and set to 0022:
_UMASK_=$(umask)
umask 0022

# Create working directories:
mkdir -p $OUTPUT          # place for the package to be saved
mkdir -p $TMP/tmp-$PRGNAM # location to build the source
mkdir -p $PKG             # place for the package to be built
rm -rf $PKG/*             # always erase old package's contents
rm -rf $TMP/tmp-$PRGNAM/* # remove the remnants of previous build
rm -rf $OUTPUT/{checkout,configure,make,install,error,makepkg,patch}-$PRGNAM.log
                          # remove old log files

# Source file availability:
if ! [ -f ${SOURCE} ]; then
  echo "Source '$(basename ${SOURCE})' not available yet..."
  # Check if the $SRCDIR is writable at all - if not, download to $OUTPUT
  [ -w "$SRCDIR" ] || SOURCE="$OUTPUT/$(basename $SOURCE)"
  if [ -f ${SOURCE} ]; then echo "Ah, found it!"; continue; fi
  if ! [ "x${SRCURL}" == "x" ]; then
    echo "Will download file to $(dirname $SOURCE)"
    wget --no-check-certificate -nv -T 20 -O "${SOURCE}" "${SRCURL}" || true
    if [ $? -ne 0 -o ! -s "${SOURCE}" ]; then
      echo "Downloading '$(basename ${SOURCE})' failed... aborting the build."
      mv -f "${SOURCE}" "${SOURCE}".FAIL
      exit 1
    fi
  else
    echo "File '$(basename ${SOURCE})' not available... aborting the build."
    exit 1
  fi
fi

if [ "$P1" == "--download" ]; then
  echo "Download complete."
  exit 0
fi

# --- PACKAGE BUILDING ---

echo "++"
echo "|| $PRGNAM-$VERSION"
echo "++"

cd $TMP/tmp-$PRGNAM
echo "Extracting the source archive(s) for $PRGNAM..."
tar -xf ${SOURCE}
cd ${PRGNAM}-${VERSION}
chown -R root:root .
chmod -R u+w,go+r-w,a+rX-st .

echo Building ...
cargo build \
  --release \
  --bin rustup-init \
  --no-default-features \
  --features reqwest-rustls-tls --features no-self-update \
  2>&1 | tee $OUTPUT/make-${PRGNAM}.log

# Manually installing everything.
# First, the rustup binary:
install -D -m0755 target/release/rustup-init $PKG/usr/bin/rustup

# System-wide symlinks to replace those of the Slackware rust package:
RUSTBINS="cargo rustc rustdoc rust-analyzer rust-gdb rust-lldb rustfmt \
  cargo-fmt cargo-clippy clippy-driver cargo-miri"
for RUSTLINK in ${RUSTBINS} ; do
  ln -s /usr/bin/rustup $PKG/usr/bin/${RUSTLINK}
done

# Add system directory which is going to hold rust releases:
mkdir -p $PKG/usr/libexec/rustup

# Add profile scripts to ensure rustup installs into the system directory:
mkdir -p $PKG/etc/profile.d
cat <<EOT > $PKG/etc/profile.d/${PRGNAM}.sh
#!/bin/sh
# Ensure that rustup installs into the system, not into $HOME
export CARGO_HOME=/usr/libexec/rustup
export RUSTUP_HOME=/usr/libexec/rustup
EOT
chmod 0755 $PKG/etc/profile.d/${PRGNAM}.sh
cat <<EOT > $PKG/etc/profile.d/${PRGNAM}.csh
#!/bin/csh
# Ensure that rustup installs into the system, not into $HOME
setenv CARGO_HOME /usr/libexec/rustup
setenv RUSTUP_HOME /usr/libexec/rustup
EOT
chmod 0755 $PKG/etc/profile.d/${PRGNAM}.csh

# Add shell completions:
# Generate completion files.
mkdir -p $PKG/usr/share/bash-completion/completions
$PKG/usr/bin/rustup completions bash > $PKG/usr/share/bash-completion/completions/rustup
$PKG/usr/bin/rustup completions bash cargo > $PKG/usr/share/bash-completion/completions/cargo
mkdir -p $PKG/usr/share/fish/vendor_completions.d
$PKG/usr/bin/rustup completions fish > $PKG/usr/share/fish/vendor_completions.d/rustup.fish
mkdir -p $PKG/usr/share/zsh/site-functions
$PKG/usr/bin/rustup completions zsh > $PKG/usr/share/zsh/site-functions/_rustup
$PKG/usr/bin/rustup completions zsh cargo > $PKG/usr/share/zsh/site-functions/_cargo

# Add documentation:
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION || true
cat $SRCDIR/$(basename $0) > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION
find $PKG/usr/doc -type f -exec chmod 644 {} \;

# Add a package description:
mkdir -p $PKG/install
cat $SRCDIR/slack-desc > $PKG/install/slack-desc

# Build the package:
cd $PKG
makepkg --linkadd y --chown n $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} 2>&1 | tee $OUTPUT/makepkg-${PRGNAM}.log
cd $OUTPUT
md5sum ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} > ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz}.md5
cd -
cat $PKG/install/slack-desc | grep "^${PRGNAM}" > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.txt

# Restore the original umask:
umask ${_UMASK_}