Gentoo: Rework Gentoo ebuild into overlay

This commit squashes all the little changes from the previous
integration branch into one, adjusts to the new Makefile changes, and
introduces an overlay layout so that the contrib/gentoo-bees subtree
can be directly added as a Portage overlay to the system.

The following list contains the previous commit descriptions:

sys-fs/bees: Keyword tested architecture ~amd64

    Bees was tested on this platform.

sys-fs/bees: Add kernel version checks

    Add checking the kernel versions and write some info and/or warnings
    before building and installing the package. Running bees on older
    kernels may have some serious performance and stability impacts, let's
    tell the user about it.

    Closes #55

sys-fs/bees: Add metadata.xml

sys-fs/bees: There's no configure script

    So, there's no point in calling "default".

sys-fs/bees: Simplify src_configure()

sys-fs/bees: Don't depend on markdown

    It makes no sense to install both README.md and README.html, and we can
    get rid of one dependency.

Dependencies: btrfs-progs is no longer a buildtime-only dep

    It is actually needed by the bees service wrapper script, as pointed out
    by Gentoo QA review.

sys-fs/bees: DOCS is not needed

    "COPYING" is already covered by the licensing. The ebuild defaults
    already include README*

sys-fs/bees: Make warnings exclusive

    It was recommended by Gentoo QA to show only either one or another
    warning, and change the texts accordingly.

sys-fs/bees: RDEPEND is not implicit

    RDEPEND does not implicitly default to DEPEND. Let's explicitly set the
    variable.

sys-fs/bees: IUSE=test is only needed for explicit dependencies

    Thus, remove it.

Signed-off-by: Kai Krakow <kai@kaishome.de>

contrib/gentoo-bees/metadata/layout.conf

@@ -0,0 +1,18 @@
+# manifest-hashes specify hashes used for new/updated entries
+# the current set went live on 2017-11-21, per 2017-11-12 Council meeting
+# https://archives.gentoo.org/gentoo-dev/message/ba2e5d9666ebd7e1bff1143485a37856
+manifest-hashes = BLAKE2B SHA512
+
+# The following hashes are required on all Manifest entries. If any
+# of them are missing, repoman will refetch and rehash old distfiles.
+# Otherwise, old distfiles will keep using their current hash set.
+manifest-required-hashes = BLAKE2B
+
+# No more old ChangeLogs in Git
+update-changelog = false
+
+# Sign Git commits, and NOT Manifests
+sign-commits = true
+sign-manifests = false
+
+masters = gentoo

contrib/gentoo-bees/profiles/repo_name

@@ -0,0 +1 @@
+bees

contrib/gentoo-bees/sys-fs/bees/Manifest

@@ -0,0 +1,2 @@
+EBUILD bees-9999.ebuild 1576 BLAKE2B 105a00d14ee885d9f6ff0758305cf67b83b8790df76f35a8e9a8719acfcad5af87e53cd6f21f99811b22e183f3b4f2f679f24b71d36529bda97c2b5f175169e5 SHA512 b85219901e2d2325c45522321c57d7e7677f87f9fc5bae59d269284a8e6366020c9772486202973c8d042e0d8cf6eb4a3801a4e9126fc445ca4f19be2688226d
+MISC metadata.xml 479 BLAKE2B ef5e110ba8d88f0188dbc0d12bec2ad45c51abf707656f6fe4e0fa498d933fe9c32c5dc4c9b446402ec686084459f9f075e52f33402810962c1ac6b149fb70c8 SHA512 3fcc136ed4c55323cac4f8cf542210eb77f73e2a80f95fcce2d688bc645f6e5126404776536dedc938b18287b54abbc264610cc2f587a42a3a8e6d7bf8415aaa

contrib/gentoo-bees/sys-fs/bees/bees-9999.ebuild

@@ -0,0 +1,57 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit multilib linux-info
+
+DESCRIPTION="Best-Effort Extent-Same, a btrfs dedup agent"
+HOMEPAGE="https://github.com/Zygo/bees"
+
+if [[ ${PV} == "9999" ]] ; then
+	EGIT_REPO_URI="https://github.com/kakra/bees.git"
+	EGIT_BRANCH="integration"
+	inherit git-r3
+	KEYWORDS=""
+else
+	SRC_URI="https://github.com/Zygo/bees/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="~amd64"
+fi
+
+LICENSE="GPL-3"
+SLOT="0"
+IUSE="tools"
+
+DEPEND="
+	>=sys-apps/util-linux-2.30.2
+	>=sys-fs/btrfs-progs-4.1
+"
+RDEPEND="${DEPEND}"
+
+pkg_pretend() {
+	if [[ ${MERGE_TYPE} != buildonly ]]; then
+		if kernel_is -lt 4 4 3; then
+			ewarn "Kernel versions below 4.4.3 lack critical features needed for bees to"
+			ewarn "properly operate, so it won't work. It's recommended to run at least"
+			ewarn "kernel version 4.11 for best performance and reliability."
+		elif kernel_is -lt 4 11; then
+			ewarn "With kernel versions below 4.11, bees may severely degrade system performance"
+			ewarn "and responsiveness. Especially, the kernel may deadlock while bees is"
+			ewarn "running, it's recommended to run at least kernel 4.11."
+		fi
+		elog "Bees recommends to run the latest current kernel for performance and"
+		elog "reliability reasons, see README.md."
+	fi
+}
+
+src_configure() {
+	cat >localconf <<-EOF || die
+		LIBEXEC_PREFIX=/usr/libexec
+		PREFIX=/usr
+		LIBDIR=$(get_libdir)
+		DEFAULT_MAKE_TARGET=all
+	EOF
+	if use tools; then
+		echo OPTIONAL_INSTALL_TARGETS=install_tools >>localconf || die
+	fi
+}

contrib/gentoo-bees/sys-fs/bees/metadata.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="person">
+	<email>hurikhan77+bgo@gmail.com</email>
+	<name>Kai Krakow</name>
+</maintainer>
+<use>
+	<flag name="tools">Build extra tools useful for debugging (fiemap, feiwalk, beestop)</flag>
+</use>
+<upstream>
+	<bugs-to>https://github.com/Zygo/bees/issues</bugs-to>
+	<remote-id type="github">Zygo/bees</remote-id>
+</upstream>
+</pkgmetadata>

contrib/gentoo/bees-9999.ebuild

@@ -1,49 +0,0 @@
-# Copyright 1999-2018 Gentoo Foundation
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=6
-
-inherit git-r3 eutils multilib
-
-DESCRIPTION="Best-Effort Extent-Same, a btrfs dedup agent"
-HOMEPAGE="https://github.com/Zygo/bees"
-
-if [[ ${PV} == "9999" ]] ; then
-	EGIT_REPO_URI="https://github.com/kakra/bees.git"
-	EGIT_BRANCH="integration"
-else
-	SRC_URI="https://github.com/Zygo/bees/archive/v${PV}.tar.gz -> ${P}.tar.gz"
-fi
-
-PATCHES="
-	${FILESDIR}/v0.5-gentoo_build.patch
-"
-
-LICENSE="GPL-3"
-SLOT="0"
-KEYWORDS=""
-IUSE="tools"
-
-COMMON_DEPEND="
-	>=sys-apps/util-linux-2.30.2
-	>=sys-devel/gcc-4.9
-	>=sys-fs/btrfs-progs-4.1
-"
-DEPEND="
-	${COMMON_DEPEND}
-	|| ( dev-python/markdown dev-python/markdown2 )
-"
-RDEPEND="${COMMON_DEPEND}"
-
-DOCS="README.md COPYING"
-HTML_DOCS="README.html"
-
-src_prepare() {
-	default
-	echo LIBDIR=$(get_libdir) >>${S}/localconf
-	localconf=${S}/localconf
-	if use tools; then
-		einfo "Building with support tools fiemap and fiewalk."
-		echo OPTIONAL_INSTALL_TARGETS=install_tools >>${localconf} || die
-	fi
-}

contrib/gentoo/files/v0.5-gentoo_build.patch

@@ -1,19 +0,0 @@
-diff --git a/localconf b/localconf
-new file mode 100644
-index 0000000..7705cbb
---- /dev/null
-+++ b/localconf
-@@ -0,0 +1,1 @@
-+LIBEXEC_PREFIX=/usr/libexec
-diff --git a/makeflags b/makeflags
-index f5983cb..0348623 100644
---- a/makeflags
-+++ b/makeflags
-@@ -1,4 +1,3 @@
--CCFLAGS  = -Wall -Wextra -Werror -O3 -march=native -I../include -ggdb -D_FILE_OFFSET_BITS=64
--# CCFLAGS  = -Wall -Wextra -Werror -O0 -I../include -ggdb -fpic -D_FILE_OFFSET_BITS=64
--CFLAGS   = $(CCFLAGS) -std=c99
--CXXFLAGS = $(CCFLAGS) -std=c++11 -Wold-style-cast
-+CCFLAGS  = -O3 -I../include -fpic -D_FILE_OFFSET_BITS=64
-+CFLAGS   += $(CCFLAGS) -std=c99
-+CXXFLAGS += $(CCFLAGS) -std=c++11 -Wold-style-cast