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

[William Hubbs <williamh@gentoo.org>]

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"
+
+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