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# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit linux-info systemd toolchain-funcs
DESCRIPTION="Best-Effort Extent-Same, a btrfs dedup agent"
HOMEPAGE="https://github.com/Zygo/bees"
if [[ ${PV} == 9999 ]] ; then
inherit git-r3
EGIT_REPO_URI="https://github.com/Zygo/bees.git"
else
SRC_URI="https://github.com/Zygo/bees/archive/v${PV}.tar.gz -> ${P}.tar.gz"
KEYWORDS="~amd64 ~arm64"
fi
LICENSE="GPL-3"
SLOT="0"
IUSE="tools"
DEPEND="
>=sys-apps/util-linux-2.30.2
>=sys-fs/btrfs-progs-4.20.2
"
RDEPEND="${DEPEND}"
CONFIG_CHECK="~BTRFS_FS"
ERROR_BTRFS_FS="CONFIG_BTRFS_FS: bees does currently only work with btrfs"
pkg_pretend() {
if [[ ${MERGE_TYPE} != buildonly ]]; then
if 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."
ewarn
elif kernel_is -lt 4 14 29; then
ewarn "With kernel versions below 4.14.29, bees may generate a lot of bogus WARN_ON()"
ewarn "messages in the kernel log. These messages can be ignored and this is fixed"
ewarn "with more recent kernels:"
ewarn "# WARNING: CPU: 3 PID: 18172 at fs/btrfs/backref.c:1391 find_parent_nodes+0xc41/0x14e0"
ewarn
elif kernel_is -lt 5 7 0; then
ewarn "With kernel versions below 5.4.96 and 5.7, the kernel may hold file system"
ewarn "locks for a long time while at the same time CPU usage increases when bees is"
ewarn "operating. bees tries to avoid this behavior by excluding very common extents"
ewarn "from deduplication. This has only a minimal impact on dedupe effectiveness."
ewarn
fi
if kernel_is -lt 5 1 0; then
ewarn "IMPORTANT: With kernel versions below 5.1.0, you may experience data corruption"
ewarn "due to bees using compression in btrfs. You are adviced to use a chronologically"
ewarn "later kernel, that includes older LTS versions released after 5.0.4:"
ewarn "Fixed in: 5.1+, 5.0.4+, 4.19.31+, 4.14.108+, 4.9.165+, 4.4.177+, 3.18.137+"
ewarn "# commit 8e92821 btrfs: fix corruption reading shared and compressed extents after hole punching"
ewarn
fi
if kernel_is -lt 5 4 19; then
ewarn "With kernel versions below 5.4.19, bees may trigger a btrfs bug when running"
ewarn "btrfs-balance in parallel. This may lead to meta-data corruption in the worst"
ewarn "case. Especially, kernels 5.1.21 and 5.2.21 should be avoided. Kernels 5.0.x"
ewarn "after 5.0.21 should be safe. In the best case, affected kernels may force"
ewarn "the device RO without writing corrupted meta-data. More details:"
ewarn "https://github.com/Zygo/bees/blob/master/docs/btrfs-kernel.md"
ewarn
fi
if kernel_is -ge 5 4 0; then
ewarn "With kernel version 5.4 or later, the kernel may hang when multiple threads"
ewarn "are running LOGICAL_INO and dedupe ioctl. This is not exclusively triggered"
ewarn "by bees but also other software running such operations, bees will just more"
ewarn "likely to trigger the bug. You can work around this issue by reducing the"
ewarn "thread count of bees to 1."
ewarn
fi
elog "Bees recommends running the latest current kernel for performance and"
elog "reliability reasons, see README.md."
fi
}
src_prepare() {
default
sed -i 's/ -Werror//' makeflags || die
}
src_configure() {
tc-export CC CXX AR
cat >localconf <<-EOF || die
ETC_PREFIX="${EPREFIX}/etc"
LIBEXEC_PREFIX="${EPREFIX}/usr/libexec"
PREFIX="${EPREFIX}/usr"
SYSTEMD_SYSTEM_UNIT_DIR="$(systemd_get_systemunitdir)"
DEFAULT_MAKE_TARGET=all
EOF
if [[ ${PV} != "9999" ]] ; then
echo BEES_VERSION=v${PV} >>localconf || die
fi
if use tools; then
echo OPTIONAL_INSTALL_TARGETS=install_tools >>localconf || die
fi
}
src_compile() {
default
# localconf quotes leak in the systemd unit but are still needed for spaces
sed -i 's/"//g' scripts/beesd@.service || die
}
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