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

[William Hubbs <williamh@gentoo.org>]

Signed-off-by: William Hubbs <williamh@gentoo.org>
---
 eclass/go-module.eclass | 105 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 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..810e66e1c5b
--- /dev/null
+++ b/eclass/go-module.eclass
@@ -0,0 +1,105 @@
+# Copyright 2019 gentoo authors
+# 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 some basic things needed by 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.
+# If foo-1.0 is the name of your project and you have the tarball for it
+# in your current directory,  this is done with the following commands:
+#
+# @CODE:
+#
+# tar -xf foo-1.0.tar.gz
+# cd foo-1.0
+# go mod vendor
+# tar -acf foo-1.0-vendor.tar.gz vendor
+#
+# @CODE:
+#
+# Regardless of whether  you create a vendor tarball, Since Go programs
+# are statically linked, it is important that the  ebuild's LICENSE=
+# setting includes the licenses of all statically linked
+# dependencies. So please make sure it is accurate.
+
+case ${EAPI:-0} in
+	7) ;;
+	*) die "${ECLASS} API in EAPI ${EAPI} not yet established."
+esac
+
+if [[ -z ${_GO_MODULE} ]]; then
+
+_GO_MODULE=1
+
+BDEPEND=">=dev-lang/go-1.12"
+
+# Force go to build in module mode.
+# In this mode the GOPATH environment variable is ignored.
+# this will become the default in the future.
+export GO111MODULE=on
+
+# The following go flags should be used for all builds.
+# -mod=vendor stopps downloading of dependencies from the internet.
+# -v prints the names of packages as they are compiled
+# -x prints commands as they are executed
+export GOFLAGS="-mod=vendor -v -x"
+
+# Do not complain about CFLAGS etc since go projects do not use them.
+QA_FLAGS_IGNORED='.*'
+
+# Go packages should not be stripped with strip(1).
+RESTRICT="strip"
+
+EXPORT_FUNCTIONS src_prepare pkg_postinst
+
+# @FUNCTION: go-module_src_prepare
+# @DESCRIPTION:
+# Run a default src_prepare then move our provided vendor directory to
+# the appropriate spot if upstream doesn't provide a vendor directory.
+# If upstream vendors and we provide a vendor tarball, this is a fatal
+# error.
+go-module_src_prepare() {
+	default
+	if [[ -d "${S}"/vendor ]] && [[ -d ../vendor ]] ; then
+		eerror "The upstream source for ${P} includes a vendor directory"
+		eerror "and a local vendor tarball is provided."
+		die "vendored dependencies are provided upstream"
+	fi
+	# Use the upstream provided vendor directory if it exists.
+	[[ -d "${S}"/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 "${S}" || die "Unable to move ../vendor directory"
+}
+
+# @FUNCTION: go-module_pkg_postinst
+# @DESCRIPTION:
+# Display a warning about security updates for Go programs.
+go-module_pkg_postinst() {
+	ewarn "${PN} is written in the Go programming language."
+	ewarn "Since this language is statically linked, security"
+	ewarn "updates will be handled in individual packages and will be"
+	ewarn "difficult for us to track as a distribution."
+	ewarn "For this reason, please update any go packages asap when new"
+	ewarn "versions enter the tree or go stable if you are running the"
+	ewarn "stable tree."
+}
+
+fi
-- 
2.21.0