#! /bin/bash

# Golang Bootstrap 
# Source: https://storage.googleapis.com/golang/go1.4.3.src.tar.gz
#
# $BUILD = Directory to temporarily install
# $PKGS  = Directory to store built packages
#
# DEPS
# Required:     NONE
# Recommended:  NONE
# Optional:     NONE

# Apply patches from Alpine Linux
patch -Np1 -i ../patches/go-bootstrap-alpine/default-sc-getpw-r-size-max.patch
patch -Np1 -i ../patches/go-bootstrap-alpine/fix-arm-hackery.patch 
patch -Np1 -i ../patches/go-bootstrap-alpine/new-binutils.patch 
patch -Np1 -i ../patches/go-bootstrap-alpine/no-longjmp-redefine.patch 
patch -Np1 -i ../patches/go-bootstrap-alpine/no-pic.patch 

# Set the paths
export GOPATH="/src"    # Full path to where source was unpacked
export GOROOT="/src/go" # Full path to unpacked source
export GOBIN="$GOROOT"/bin
export GOROOT_FINAL=/usr/lib/go-bootstrap # Full path where bootstrap will finally be installed
export CGO_ENABLED=0

# Set the arch
case $(uname -m) in
	x86)    export GOARCH="386" ;;
	x86_64) export GOARCH="amd64" ;;
	arm*)   export GOARCH="arm" ;;
	*)return 1 ;;
esac

# Build!
cd src && 
./make.bash --no-clean

# Install!
cd ..
sudo -S mkdir -pv $BUILD/usr/lib/go-bootstrap $BUILD/usr/lib/go-bootstrap

# Per Apline Linux:
# The source needs to be installed due to an upstream
# bug (https://github.com/golang/go/issues/2775).
sudo -S cp -a bin pkg src $BUILD/usr/lib/go-bootstrap

# Remove tests and bashscripts from /usr/lib/go/src.
# Those shouldn't be affacted by the upstream bug (see above).
find $BUILD/usr/lib/go-bootstrap/src \( -type f -a -name "*_test.go" \) \
	-exec sudo -S rm -rvf \{\} \+ || return 1
find $BUILD/usr/lib/go-bootstrap/src \( -type d -a -name "testdata" \) \
	-exec sudo -S rm -rvf \{\} \+ || return 1
find $BUILD/usr/lib/go-bootstrap/src \( -type f -a -name "*.bash" \) \
	-exec rm -rf \{\} \+ || return 1

cd $BUILD && sudo -S mkdir -v ${BUILD}/install &&
cat > /tmp/slack-desc << "EOF"
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description.  Line
# up the first '|' above the ':' following the base package name, and the '|'
# on the right side marks the last column you can put a character in.  You must
# make exactly 11 lines for the formatting to be correct.  It's also
# customary to leave one space after the ':' except on otherwise blank lines.

            |-----handy-ruler------------------------------------------------------|
go-bootstrap: Go Bootstrap
go-bootstrap:
go-bootstrap: Go programming language compiler used for bootstraping
go-bootstrap:
EOF
sudo -S mv -v /tmp/slack-desc install/ &&
sudo -S makepkg -l y -c n $PKGS/go-bootstrap-1.4.3-$(uname -m)-mlfs.txz &&
sudo -S rm -rf ${BUILD}/*