Add ebuild template.

.gentoo/overlays

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+mad-hacking https://github.com/MADhacking/overlay.git

.gentoo/sys-cluster/rbd-client-tools/metadata.xml

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+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+
+<pkgmetadata>
+	<maintainer type="person">
+		<email>[email protected]</email>
+		<name>Overlay Maintainer</name>
+	</maintainer>
+	<upstream>
+		<maintainer>
+			<email>[email protected]</email>
+			<name>Default Package Maintainer</name>
+		</maintainer>
+		<bugs-to>https://github.com/MADhacking/rbd-client-tools/issues</bugs-to>
+		<doc>https://github.com/MADhacking/rbd-client-tools</doc>
+	</upstream>
+</pkgmetadata>

.gentoo/sys-cluster/rbd-client-tools/rbd-client-tools-9999.ebuild

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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DESCRIPTION="Client tools for Rados Block Device (RBD) including mount.rbd helper script"
+HOMEPAGE="https://github.com/GITHUB_REPOSITORY"
+LICENSE="GPL-3"
+
+if [[ ${PV} = *9999* ]]; then
+    inherit git-r3
+    EGIT_REPO_URI="https://github.com/GITHUB_REPOSITORY"
+    EGIT_BRANCH="GITHUB_REF"
+else
+    SRC_URI="https://github.com/GITHUB_REPOSITORY/archive/${PV}.tar.gz -> ${P}.tar.gz"
+fi
+
+KEYWORDS=""
+IUSE="test"
+SLOT="0"
+
+RDEPEND="sys-cluster/ceph"
+
+src_install() {
+    einstalldocs
+
+    exeinto /sbin
+    doexe sbin/*
+}