mail-filter/postforward: Initial ebuild

Postforward is a mail forwarding utility which aims to compliment the
Postfix Sender Rewriting Scheme daemon (PostSRSd) by allowing only
certain addresses to be forwarded while leaving leaving non-forwarded
mail unaltered by PostSRSd.

 - Create initial ebuild
 - Work around upstream not putting their .go files in src/ which
   makes "go build" angry
 - Work around golang-build complaining about pkg not existing
   and just do the install by hand
 - Patch default sendmail path to respect EPREFIX and use the
   standard postfix install location instead of depending on
   it being in the path
 - Implement requests made by monsueirp on GitHub:
   https://github.com/gentoo/gentoo/pull/5910#pullrequestreview-83093569
 - Implement requests made by mgorny on GitHub:
   https://github.com/gentoo/gentoo/pull/5910#pullrequestreview-103921727

Package-Manager: Portage-2.3.8, Repoman-2.3.3
Closes: https://bugs.gentoo.org/650398
Closes: https://github.com/gentoo/gentoo/pull/5910

4 files changed, 76 insertions, 0 deletions

diff --git a/mail-filter/postforward/Manifest b/mail-filter/postforward/Manifest
new file mode 100644
index 000000000000..7cdc14db3424
--- /dev/null
+++ b/mail-filter/postforward/Manifest
@@ -0,0 +1 @@
+DIST postforward-1.1.0.tar.gz 5707 BLAKE2B 2dc994628820b40caf3b9c65ad6be48e220abff8f5a6d6054b109600d9d368fab3e6e642dbc5a98235f440359600a3f4bbc19f7ead06fd84802a8900fa465dc1 SHA512 39d7a33c454b1529a691b24fd69b311ba368caf59168d39146654cfe319ebc3cf73835e66e6c95a43747f389a6b954ac8da0d7e934e562c16cb85dc20c0f4804
diff --git a/mail-filter/postforward/files/postforward_apply-sendmail-path.patch b/mail-filter/postforward/files/postforward_apply-sendmail-path.patch
new file mode 100644
index 000000000000..c64b76368a39
--- /dev/null
+++ b/mail-filter/postforward/files/postforward_apply-sendmail-path.patch
@@ -0,0 +1,11 @@
+--- a/postforward.go
++++ b/postforward.go
+@@ -27,7 +27,7 @@ const (
+ )
+ 
+ var dryRun = flag.Bool("dry-run", false, "show what would be done, don't actually forward mail")
+-var path = flag.String("path", "", "override $PATH with this value when executing binaries")
++var path = flag.String("path", "@GENTOO_PORTAGE_EPREFIX@/usr/sbin", "override $PATH with this value when executing binaries")
+ var rpHeader = flag.String("rp-header", "Return-Path", "header name containing the return-path (MAIL FROM) value")
+ var sendmailPath = flag.String("sendmail-path", "sendmail", "path to the sendmail binary (deprecated: use --path instead)")
+ var srsAddr = flag.String("srs-addr", "localhost:10001", "TCP address for SRS lookups")
diff --git a/mail-filter/postforward/metadata.xml b/mail-filter/postforward/metadata.xml
new file mode 100644
index 000000000000..e9e4ddc46066
--- /dev/null
+++ b/mail-filter/postforward/metadata.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="person">
+    <email>gentoo_bugs_peep@parallaxshift.com</email>
+    <name>Philippe Chaintreuil</name>
+  </maintainer>
+
+  <maintainer type="project">
+    <email>proxy-maint@gentoo.org</email>
+    <name>Proxy Maintainers</name>
+  </maintainer>
+
+  <upstream>
+    <remote-id type="github">zoni/postforward</remote-id>
+  </upstream>
+</pkgmetadata>
diff --git a/mail-filter/postforward/postforward-1.1.0.ebuild b/mail-filter/postforward/postforward-1.1.0.ebuild
new file mode 100644
index 000000000000..681a874c9e66
--- /dev/null
+++ b/mail-filter/postforward/postforward-1.1.0.ebuild
@@ -0,0 +1,47 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit eutils golang-build
+
+DESCRIPTION="Postfix Sender Rewriting Scheme forwarding agent"
+EGO_PN="${PN}"
+SRC_URI="https://github.com/zoni/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+HOMEPAGE="https://github.com/zoni/postforward"
+
+LICENSE="BSD-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+DEPEND="
+	dev-lang/go:0"
+RDEPEND="
+	mail-filter/postsrsd"
+
+PATCHES=( "${FILESDIR}/${PN}_apply-sendmail-path.patch" )
+
+src_prepare() {
+	default
+
+	# Dynamically fix EPREFIX lines made by ${PN}_apply-sendmail-path.patch
+	sed -i -e "s/@GENTOO_PORTAGE_EPREFIX@/${EPREFIX}/" *.go || die
+
+	# go build assumes files will be in src dir, but
+	# source files are in root in this package, so move
+	# them.
+	local new_src_dir="${S}/src/${EGO_PN}"
+	# Freak out if there's already something there because
+	# it means the package has changed and we'll need to
+	# adjust to it.
+	[[ ! -e "${new_src_dir}" ]] || die "${new_src_dir} already exists"
+	mkdir -p "${new_src_dir}" || die
+	mv *.go "${new_src_dir}" || die
+}
+
+# Standard golang-build src_install complains about pkg not
+# existing, so we go custom.
+src_install() {
+	einstalldocs
+	dosbin "${PN}"
+}