#!/bin/mkpkg
# description: The Go programming language compiler and tools
# url: https://go.dev/

# Note: Bootstrap binary (glibc-linked) is used only during build.
# The final toolchain is pure Go — static binaries, no libc dependency.
# linux/amd64 only — no cross-compilation support.

name=go
version=1.27.1
release=1
_bootver=1.26.6
depends=()
makedeps=()
source=(
    https://dl.google.com/go/go$version.src.tar.gz
    https://dl.google.com/go/go$_bootver.linux-amd64.tar.gz
)
renames=(
    $name-$version.src.tar.gz
    $name-boot-$_bootver.tar.gz
)
sha256sums=(
    "4e408abae126d916b6164627193f2c54f0e3ca1312d693b86db45f862ab238b1"
    "708effb774be8237570d0add163225abbdfaf4fca28b2611df167beba4feef89"
)

extract() {
    tar -xf $PKGMK_SOURCE_DIR/$name-$version.src.tar.gz -C $SRC
    mkdir -p $SRC/go-boot
    tar -xf $PKGMK_SOURCE_DIR/$name-boot-$_bootver.tar.gz -C $SRC/go-boot --strip-components=1
}

build() {
    export GOROOT_BOOTSTRAP=$SRC/go-boot
    export GOROOT_FINAL=/usr/lib/go
    export GOROOT=$SRC/go
    export GOBIN=$GOROOT/bin
    export GOPATH=$SRC/.go

    export CGO_ENABLED=0
    export GOOS=linux
    export GOARCH=amd64

    cd $SRC/go/src
    bash make.bash -v

    # Install GOROOT
    install -d $PKG/usr/lib/go

    # Binaries
    install -d $PKG/usr/lib/go/bin
    install -m755 $SRC/go/bin/go    $PKG/usr/lib/go/bin/
    install -m755 $SRC/go/bin/gofmt $PKG/usr/lib/go/bin/

    # Symlinks
    install -d $PKG/usr/bin
    ln -s /usr/lib/go/bin/go    $PKG/usr/bin/go
    ln -s /usr/lib/go/bin/gofmt $PKG/usr/bin/gofmt

    # VERSION file — Go needs this to know its own version
    cp $SRC/go/VERSION $PKG/usr/lib/go/

    # go.env
    install -m644 $SRC/go/go.env $PKG/usr/lib/go/

    # Toolchain binaries (compiler, linker, assembler, etc.)
    install -d $PKG/usr/lib/go/pkg/tool/linux_amd64
    cp -a $SRC/go/pkg/tool/linux_amd64/* $PKG/usr/lib/go/pkg/tool/linux_amd64/
    rm -f $PKG/usr/lib/go/pkg/tool/linux_amd64/api

    # Include headers (amd64 only)
    install -d $PKG/usr/lib/go/pkg/include
    install -m644 $SRC/go/pkg/include/asm_amd64.h  $PKG/usr/lib/go/pkg/include/
    install -m644 $SRC/go/pkg/include/funcdata.h    $PKG/usr/lib/go/pkg/include/
    install -m644 $SRC/go/pkg/include/textflag.h    $PKG/usr/lib/go/pkg/include/

    # Standard library source (required — Go compiles stdlib on demand)
    cp -a $SRC/go/src $PKG/usr/lib/go/

    # Timezone data (needed at runtime)
    install -d $PKG/usr/lib/go/lib/time
    cp $SRC/go/lib/time/zoneinfo.zip $PKG/usr/lib/go/lib/time/

    # --- Strip down for pkgtools ---

    # Remove src/cmd/ — precompiled tools are in pkg/tool/linux_amd64/
    rm -rf $PKG/usr/lib/go/src/cmd

    # Remove all test files
    find $PKG/usr/lib/go/src -name '*_test.go' -delete
    find $PKG/usr/lib/go/src -type d -name 'testdata' -exec rm -rf {} + 2>/dev/null || true

    # Remove non-linux OS source files
    find $PKG/usr/lib/go/src \( \
        -name '*_windows.*' -o \
        -name '*_darwin.*' -o \
        -name '*_freebsd.*' -o \
        -name '*_openbsd.*' -o \
        -name '*_netbsd.*' -o \
        -name '*_plan9.*' -o \
        -name '*_aix.*' -o \
        -name '*_solaris.*' -o \
        -name '*_illumos.*' -o \
        -name '*_dragonfly.*' -o \
        -name '*_hurd.*' -o \
        -name '*_js.*' -o \
        -name '*_wasip1.*' -o \
        -name '*_wasip2.*' -o \
        -name '*_ios.*' -o \
        -name '*_android.*' -o \
        -name '*_zos.*' \
    \) -delete

    # Remove non-amd64 arch source files
    find $PKG/usr/lib/go/src \( \
        -name '*_arm.*' -o \
        -name '*_arm64.*' -o \
        -name '*_mips.*' -o \
        -name '*_mips64.*' -o \
        -name '*_mips64x.*' -o \
        -name '*_mipsx.*' -o \
        -name '*_ppc64.*' -o \
        -name '*_ppc64x.*' -o \
        -name '*_ppc64le.*' -o \
        -name '*_riscv64.*' -o \
        -name '*_s390x.*' -o \
        -name '*_wasm.*' -o \
        -name '*_386.*' -o \
        -name '*_loong64.*' \
    \) -delete

    # Remove Solaris-only vendored package
    rm -rf $PKG/usr/lib/go/src/vendor/golang.org/x/net/lif

    # Remove Windows/Plan9 build scripts (keep bash — needed at runtime)
    find $PKG/usr/lib/go/src -maxdepth 1 \( -name '*.bat' -o -name '*.rc' \) -delete

    # Remove empty directories
    find $PKG/usr/lib/go/src -type d -empty -delete 2>/dev/null || true
}

signify() {
    untrusted comment: public key
    RWTZ9IduCSQ/mL8337TEUinPwT92xFEUpD92hkS7IxcOnzTt9QdpohT3
}

# vim: filetype=sh