Re: [gentoo-dev] [PATCH 1/3] go-module.eclass: introduce new eclass to handle go modules

[Alec Warner <antarus@gentoo.org>]

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On Wed, Sep 11, 2019 at 10:28 AM William Hubbs <williamh@gentoo.org> wrote:

> Copyright: Sony Interactive Entertainment Inc.
> Signed-off-by: William Hubbs <williamh@gentoo.org>
> ---
>  eclass/go-module.eclass | 76 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 76 insertions(+)
>  create mode 100644 eclass/go-module.eclass
>
> diff --git a/eclass/go-module.eclass b/eclass/go-module.eclass
> new file mode 100644
> index 00000000000..7009fcd3beb
> --- /dev/null
> +++ b/eclass/go-module.eclass
> @@ -0,0 +1,76 @@
> +# Copyright 1999-2015 Gentoo Foundation
> +# Distributed under the terms of the GNU General Public License v2
> +
> +# @ECLASS: go-module.eclass
> +# @MAINTAINER:
> +# William Hubbs <williamh@gentoo.org>
> +# @SUPPORTED_EAPIS: 7
> +# @BLURB: basic eclass for building software written in the go
> +# programming language that uses go modules.
> +# @DESCRIPTION:
> +# This eclass provides a convenience src_prepare() phase and some basic
> +# settings needed for all software written in the go programming
> +# language that uses go modules.
> +#
> +# You will know the software you are packaging uses modules because
> +# it will have files named go.sum and go.mod in its top-level source
> +# directory. If it does not have these files, use the golang-* eclasses.
> +#
> +# If the software you are packaging uses modules, the next question is
> +# whether it has a directory named "vendor" at the top-level of the
> source tree.
> +#
> +# If it doesn't, you need to create a tarball of what would be in the
> +# vendor directory and mirror it locally. This is done with the
> +# following commands if upstream is using a git repository:
> +#
> +# @CODE:
> +#
> +# $ cd /my/clone/of/upstream
> +# $ git checkout <release>
> +# $ go mod vendor
> +# $ tar cvf project-version-vendor.tar.gz vendor
> +#
> +# @CODE:
> +#
> +# Other than this, all you need to do is inherit this eclass then
> +# make sure  the exported src_prepare function is run.
> +
> +case ${EAPI:-0} in
> +       7) ;;
> +       *) die "${ECLASS} API in EAPI ${EAPI} not yet established."
> +esac
> +
> +if [[ -z ${_GO_MODULE} ]]; then
> +
> +_GO_MODULE=1
> +
> +BDEPEND=">=dev-lang/go-1.12"
> +
> +# Do not download dependencies from the internet
> +# make build output verbose by default
> +export GOFLAGS="-mod=vendor -v -x"
> +
> +# Do not complain about CFLAGS etc since go projects do not use them.
> +QA_FLAGS_IGNORED='.*'
> +
> +# Upstream does not support stripping go packages
> +RESTRICT="strip"
>

https://golang.org/cmd/link/ implies you can pass -s -w to the compiler to
reduce binary size.

Does that not work in portage by default, or does upstream just consider
that bad practice?

-A


> +
> +EXPORT_FUNCTIONS src_prepare
> +
> +# @FUNCTION: go-module_src_prepare
> +# @DESCRIPTION:
> +# Run a default src_prepare then move our provided vendor directory to
> +# the appropriate spot if upstream doesn't provide a vendor directory.
> +go-module_src_prepare() {
> +       default
> +       # Use the upstream provided vendor directory if it exists.
> +       [[ -d vendor ]] && return
> +       # If we are not providing a mirror of a vendor directory we created
> +       # manually, return since there may be nothing to vendor.
> +       [[ ! -d ../vendor ]] && return
> +       # At this point, we know we are providing a vendor mirror.
> +       mv ../vendor . || die "Unable to move ../vendor directory"
> +}
> +
> +fi
> --
> 2.21.0
>
>
>

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