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diff --git a/eclass/bzr.eclass b/eclass/bzr.eclass
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+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: bzr.eclass
+# @MAINTAINER:
+# Ulrich Müller <ulm@gentoo.org>
+# @AUTHOR:
+# Jorge Manuel B. S. Vicetto <jmbsvicetto@gentoo.org>
+# Mark Lee <bzr-gentoo-overlay@lazymalevolence.com>
+# Ulrich Müller <ulm@gentoo.org>
+# Christian Faulhammer <fauli@gentoo.org>
+# @SUPPORTED_EAPIS: 7 8
+# @BLURB: generic fetching functions for the Bazaar VCS
+# @DESCRIPTION:
+# The bzr.eclass provides functions to fetch and unpack sources from
+# repositories of the Bazaar distributed version control system.
+# The eclass was originally derived from git.eclass.
+#
+# Note: Just set EBZR_REPO_URI to the URI of the branch and src_unpack()
+# of this eclass will export the branch to ${WORKDIR}/${P}.
+
+case ${EAPI} in
+	7|8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} is not supported" ;;
+esac
+
+PROPERTIES+=" live"
+
+BDEPEND="dev-vcs/breezy"
+
+EXPORT_FUNCTIONS src_unpack
+
+# @ECLASS-VARIABLE: EBZR_STORE_DIR
+# @USER_VARIABLE
+# @DESCRIPTION:
+# The directory to store all fetched Bazaar live sources.
+: ${EBZR_STORE_DIR:=${PORTAGE_ACTUAL_DISTDIR:-${DISTDIR}}/bzr-src}
+
+# @ECLASS-VARIABLE: EBZR_UNPACK_DIR
+# @DESCRIPTION:
+# The working directory where the sources are copied to.
+: ${EBZR_UNPACK_DIR:=${WORKDIR}/${P}}
+
+# @ECLASS-VARIABLE: EBZR_INIT_REPO_CMD
+# @DESCRIPTION:
+# The Bazaar command to initialise a shared repository.
+: ${EBZR_INIT_REPO_CMD:="brz init-shared-repository --no-trees"}
+
+# @ECLASS-VARIABLE: EBZR_FETCH_CMD
+# @DESCRIPTION:
+# The Bazaar command to fetch the sources.
+: ${EBZR_FETCH_CMD:="brz branch --no-tree"}
+
+# @ECLASS-VARIABLE: EBZR_UPDATE_CMD
+# @DESCRIPTION:
+# The Bazaar command to update the sources.
+: ${EBZR_UPDATE_CMD:="brz pull --overwrite-tags"}
+
+# @ECLASS-VARIABLE: EBZR_EXPORT_CMD
+# @DESCRIPTION:
+# The Bazaar command to export a branch.
+: ${EBZR_EXPORT_CMD:="brz export"}
+
+# @ECLASS-VARIABLE: EBZR_CHECKOUT_CMD
+# @DESCRIPTION:
+# The Bazaar command to checkout a branch.
+: ${EBZR_CHECKOUT_CMD:="brz checkout --lightweight -q"}
+
+# @ECLASS-VARIABLE: EBZR_REVNO_CMD
+# @DESCRIPTION:
+# The Bazaar command to list a revision number of the branch.
+: ${EBZR_REVNO_CMD:="brz revno"}
+
+# @ECLASS-VARIABLE: EBZR_OPTIONS
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# The options passed to the fetch and update commands.
+
+# @ECLASS-VARIABLE: EBZR_REPO_URI
+# @DEFAULT_UNSET
+# @REQUIRED
+# @DESCRIPTION:
+# The repository URI for the source package.
+
+# @ECLASS-VARIABLE: EBZR_PROJECT
+# @DESCRIPTION:
+# The project name of your ebuild.  Normally, the branch will be stored
+# in the ${EBZR_STORE_DIR}/${EBZR_PROJECT} directory.
+#
+# If EBZR_BRANCH is set (see below), then a shared repository will be
+# created in that directory, and the branch will be located in
+# ${EBZR_STORE_DIR}/${EBZR_PROJECT}/${EBZR_BRANCH}.
+: ${EBZR_PROJECT:=${PN}}
+
+# @ECLASS-VARIABLE: EBZR_BRANCH
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# The directory where to store the branch within a shared repository,
+# relative to ${EBZR_STORE_DIR}/${EBZR_PROJECT}.
+#
+# This variable should be set if there are several live ebuilds for
+# different branches of the same upstream project.  The branches can
+# then share the same repository in EBZR_PROJECT, which will save both
+# data traffic volume and disk space.
+#
+# If there is only a live ebuild for one single branch, EBZR_BRANCH
+# needs not be set.  In this case, the branch will be stored in a
+# stand-alone repository directly in EBZR_PROJECT.
+
+# @ECLASS-VARIABLE: EBZR_REVISION
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Revision to fetch, defaults to the latest (see brz help revisionspec).
+
+# @ECLASS-VARIABLE: EBZR_OFFLINE
+# @USER_VARIABLE
+# @DESCRIPTION:
+# Set this variable to a non-empty value to disable automatic updating
+# of a bzr source tree.  This is intended to be set outside the ebuild
+# by users.
+: ${EBZR_OFFLINE=${EVCS_OFFLINE}}
+
+# @ECLASS-VARIABLE: EVCS_UMASK
+# @USER_VARIABLE
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Set this variable to a custom umask.  This is intended to be set by
+# users.  By setting this to something like 002, it can make life easier
+# for people who do development as non-root (but are in the portage
+# group), and then switch over to building with FEATURES=userpriv.
+# Or vice-versa.  Shouldn't be a security issue here as anyone who has
+# portage group write access already can screw the system over in more
+# creative ways.
+
+# @ECLASS-VARIABLE: EBZR_WORKDIR_CHECKOUT
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# If this variable is set to a non-empty value, EBZR_CHECKOUT_CMD will
+# be used instead of EBZR_EXPORT_CMD to copy the sources to WORKDIR.
+
+# @FUNCTION: _bzr_initial_fetch
+# @USAGE: <repository URI> <branch directory>
+# @INTERNAL
+# @DESCRIPTION:
+# Internal function, retrieves the source code from a repository for the
+# first time, using ${EBZR_FETCH_CMD}.
+_bzr_initial_fetch() {
+	local repo_uri=$1 branch_dir=$2
+
+	if [[ -n ${EBZR_OFFLINE} ]]; then
+		die "EBZR_OFFLINE cannot be used when there is no local branch yet."
+	fi
+
+	# fetch branch
+	einfo "bzr branch start -->"
+	einfo "   repository: ${repo_uri} => ${branch_dir}"
+
+	${EBZR_FETCH_CMD} ${EBZR_OPTIONS} "${repo_uri}" "${branch_dir}" \
+		|| die "${ECLASS}: can't branch from ${repo_uri}"
+}
+
+# @FUNCTION: _bzr_update
+# @USAGE: <repository URI> <branch directory>
+# @INTERNAL
+# @DESCRIPTION:
+# Internal function, updates the source code from a repository, using
+# ${EBZR_UPDATE_CMD}.
+_bzr_update() {
+	local repo_uri=$1 branch_dir=$2
+
+	if [[ -n ${EBZR_OFFLINE} ]]; then
+		einfo "skipping bzr pull -->"
+		einfo "   repository: ${repo_uri}"
+	else
+		# update branch
+		einfo "bzr pull start -->"
+		einfo "   repository: ${repo_uri}"
+
+		pushd "${branch_dir}" > /dev/null \
+			|| die "${ECLASS}: can't chdir to ${branch_dir}"
+		${EBZR_UPDATE_CMD} ${EBZR_OPTIONS} "${repo_uri}" \
+			|| die "${ECLASS}: can't pull from ${repo_uri}"
+		popd > /dev/null || die "${ECLASS}: popd failed"
+	fi
+}
+
+# @FUNCTION: bzr_fetch
+# @DESCRIPTION:
+# Wrapper function to fetch sources from a Bazaar repository with
+# bzr branch or bzr pull, depending on whether there is an existing
+# working copy.
+bzr_fetch() {
+	local repo_dir branch_dir save_umask
+
+	[[ -n ${EBZR_REPO_URI} ]] || die "${ECLASS}: EBZR_REPO_URI is empty"
+
+	if [[ ! -d ${EBZR_STORE_DIR} ]]; then
+		(
+			addwrite /
+			mkdir -p "${EBZR_STORE_DIR}" \
+				|| die "${ECLASS}: can't mkdir ${EBZR_STORE_DIR}"
+		)
+	fi
+
+	pushd "${EBZR_STORE_DIR}" > /dev/null \
+		|| die "${ECLASS}: can't chdir to ${EBZR_STORE_DIR}"
+
+	repo_dir=${EBZR_STORE_DIR}/${EBZR_PROJECT}
+	branch_dir=${repo_dir}${EBZR_BRANCH:+/${EBZR_BRANCH}}
+
+	if [[ -n ${EVCS_UMASK} ]]; then
+		save_umask=$(umask) || die
+		umask "${EVCS_UMASK}" || die
+	fi
+	addwrite "${EBZR_STORE_DIR}"
+
+	if [[ ! -d ${branch_dir}/.bzr ]]; then
+		if [[ ${repo_dir} != "${branch_dir}" && ! -d ${repo_dir}/.bzr ]]; then
+			einfo "creating shared bzr repository: ${repo_dir}"
+			${EBZR_INIT_REPO_CMD} "${repo_dir}" \
+				|| die "${ECLASS}: can't create shared repository"
+		fi
+		_bzr_initial_fetch "${EBZR_REPO_URI}" "${branch_dir}"
+	else
+		_bzr_update "${EBZR_REPO_URI}" "${branch_dir}"
+	fi
+
+	if [[ -n ${save_umask} ]]; then
+		umask "${save_umask}" || die
+	fi
+
+	cd "${branch_dir}" || die "${ECLASS}: can't chdir to ${branch_dir}"
+
+	# Save revision number in environment. #311101
+	export EBZR_REVNO=$(${EBZR_REVNO_CMD})
+
+	if [[ -n ${EBZR_WORKDIR_CHECKOUT} ]]; then
+		einfo "checking out ..."
+		${EBZR_CHECKOUT_CMD} ${EBZR_REVISION:+-r ${EBZR_REVISION}} \
+			. "${EBZR_UNPACK_DIR}" || die "${ECLASS}: checkout failed"
+	else
+		einfo "exporting ..."
+		${EBZR_EXPORT_CMD} ${EBZR_REVISION:+-r ${EBZR_REVISION}} \
+			"${EBZR_UNPACK_DIR}" . || die "${ECLASS}: export failed"
+	fi
+	einfo \
+		"revision ${EBZR_REVISION:-${EBZR_REVNO}} is now in ${EBZR_UNPACK_DIR}"
+
+	popd > /dev/null || die "${ECLASS}: popd failed"
+}
+
+# @FUNCTION: bzr_src_unpack
+# @DESCRIPTION:
+# Default src_unpack(), calls bzr_fetch.
+bzr_src_unpack() {
+	bzr_fetch
+}