#!/bin/bash
[% c("var/set_default_env") -%]
distdir=/var/tmp/dist/[% project %]
mkdir -p /var/tmp/dist

[% IF c("var/linux") %]
  # Config options for hardening-wrapper
  export DEB_BUILD_HARDENING=1
  export DEB_BUILD_HARDENING_STACKPROTECTOR=1
  export DEB_BUILD_HARDENING_FORTIFY=1
  export DEB_BUILD_HARDENING_FORMAT=1
  export DEB_BUILD_HARDENING_PIE=1
[% END %]

mkdir -p /var/tmp/build

# Building go 1.4.x
# This is needed to bootstrap the go that we actually use
# https://golang.org/doc/install/source#go14
tar -C /var/tmp/build --transform='s,^go\>,go1.4,' -xf $rootdir/[% c('input_files_by_name/go14') %]
cd /var/tmp/build/go1.4/src
# Disable cgo to avoid conflicts with newer GCC. cgo is not needed for the bootstrap go.
# https://github.com/golang/go/issues/13114#issuecomment-186922245
# Disable CC etc. that are set up for cross builds.
CGO_ENABLED=0 CC= CFLAGS= LDFLAGS= ./make.bash
export GOROOT_BOOTSTRAP="/var/tmp/build/go1.4"

cd $rootdir
[% IF ! c("var/linux") %]
  [% pc(c('var/compiler'), 'var/setup', { compiler_tarfile => c('input_files_by_name/' _ c('var/compiler')) }) %]
  # http://golang.org/doc/install/source#environment
  export GOOS=[% c("var/GOOS") %]
  export GOARCH=[% c("var/GOARCH") %]
[% END %]

# Building go
# http://golang.org/doc/install/source#environment
tar -C /var/tmp/dist -xf $rootdir/[% c('input_files_by_name/go') %]
export GOROOT="$distdir"
cd /var/tmp/dist/go/src
[% IF c("var/linux") -%]
  ./make.bash
[% ELSIF c("var/osx") -%]
  unset LDFLAGS
  rm -Rf $clangdir/helpers
  export CC="$clangdir/bin/clang [% c("var/FLAGS") %]"
  # Create a cc-for-target script that closes over CC, CFLAGS, and LDFLAGS.
  # Go's CC_FOR_TARGET only allows a command name, not a command with arguments.
  # https://github.com/golang/go/issues/15457
  CC_FOR_TARGET="$(pwd)/cc-for-target"
  echo "#!/bin/sh" > "$CC_FOR_TARGET"
  echo "exec $CC $CFLAGS $LDFLAGS \"\$@\"" >> "$CC_FOR_TARGET"
  chmod +x "$CC_FOR_TARGET"
  # faketime is needed because clang 3.9.1 on Darwin embeds the timestamps of
  # certain intermediate object files (including those that arise here while
  # compiling the Go runtime itself). Without this, variable timestamps would
  # end up in snowflake-client.
  # https://github.com/golang/go/issues/9206#issuecomment-310476743
  CGO_ENABLED=1 CC_FOR_TARGET="$CC_FOR_TARGET" CC= CFLAGS= LDFLAGS= [% c("var/faketime") %] ./make.bash
[% ELSIF c("var/windows") -%]
  # Create a cc-for-target script that closes over CC, CFLAGS, and LDFLAGS.
  # Go's CC_FOR_TARGET only allows a command name, not a command with arguments.
  # https://github.com/golang/go/issues/15457
  CC_FOR_TARGET="$(pwd)/cc-for-target"
  echo "#!/bin/sh" > "$CC_FOR_TARGET"
  echo "exec [% c("arch") %]-w64-mingw32-gcc [% c("var/CFLAGS") %] [% c("var/LDFLAGS") %] \"\$@\"" >> "$CC_FOR_TARGET"
  chmod +x "$CC_FOR_TARGET"
  CGO_ENABLED=1 CC_FOR_TARGET="$CC_FOR_TARGET" CC= CFLAGS= LDFLAGS= ./make.bash
[% ELSIF c("var/android") -%]
  patch -p2 < $rootdir/0001-Use-fixed-go-build-tmp-directory.patch
  CGO_ENABLED=1 CC_FOR_TARGET=[% c("var/CC") %] CC= CFLAGS= LDFLAGS= ./make.bash
[% END -%]

# This directory is non-reproducible and doesn't exist in official Go releases,
# so remove it to preserve reproducibility of the output.
rm -rf /var/tmp/dist/go/pkg/obj/go-build/

cd /var/tmp/dist
[% c('tar', {
        tar_src => [ project ],
        tar_args => '-czf ' _ dest_dir _ '/' _ c('filename'),
    }) %]
