On 2024-07-10 09:19, Florian Schmaus wrote:

From: Florian Schmaus <flow@gentoo.org>

Add a new eclass for dev-util/rebar:3, based on the work of Anna
Vyalkova in ::guru (thanks!).

There's also rebar3.eclass in lanodanOverlay, hereby CC-ing Haelwenn on
this.

The Erlang/OTP ecosystem is moving to Rebar3. Upstreams start to drop
support for Rebar2, or at least consider it.

Signed-off-by: Florian Schmaus <flow@gentoo.org>
---
eclass/rebar3.eclass | 204 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 204 insertions(+)
create mode 100644 eclass/rebar3.eclass

diff --git a/eclass/rebar3.eclass b/eclass/rebar3.eclass
new file mode 100644
index 000000000000..83363ab54602
--- /dev/null
+++ b/eclass/rebar3.eclass
@@ -0,0 +1,204 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: rebar3.eclass
+# @MAINTAINER:
+# Florian Schmaus <flow@gentoo.org>
+# @AUTHOR:
+# Amadeusz Żołnowski <aidecoe@gentoo.org>
+# Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in>
+# @SUPPORTED_EAPIS: 8
+# @PROVIDES: rebar-utils
+# @BLURB: Build Erlang/OTP projects using dev-util/rebar:3.
+# @DESCRIPTION:
+# An eclass providing functions to build Erlang/OTP projects using
+# dev-util/rebar:3.
+#
+# rebar is a tool which tries to resolve dependencies itself which is by
+# cloning remote git repositories. Dependent projects are usually expected to >+# be in sub-directory 'deps' rather than looking at system Erlang lib
+# directory. Projects relying on rebar usually don't have 'install' make
+# targets. The eclass workarounds some of these problems. It handles
+# installation in a generic way for Erlang/OTP structured projects.
+
+case ${EAPI} in
+ 8) ;;
+ *) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
+if [[ -z ${_REBAR3_ECLASS} ]]; then
+_REBAR3_ECLASS=1
+
+inherit edo rebar-utils
+
+RDEPEND="dev-lang/erlang:="
+DEPEND="${RDEPEND}"
+BDEPEND="
+ dev-util/rebar:3
+ >=sys-apps/gawk-4.1
+"
+
+# @ECLASS_VARIABLE: REBAR_PROFILE
+# @DESCRIPTION:
+# Rebar profile to use.
+: "${REBAR_PROFILE:=default}"
+
+# @ECLASS_VARIABLE: REBAR_APP_SRC
+# @DESCRIPTION:
+# Relative path to .app.src description file.
+: "${REBAR_APP_SRC:=src/${PN}.app.src}"
+
+# @FUNCTION: get_erl_libs
+# @RETURN: the path to Erlang lib directory
+# @DESCRIPTION:
+# Get the full path without EPREFIX to Erlang lib directory.
+get_erl_libs() {
+ echo "/usr/$(get_libdir)/erlang/lib"
+}
+
+# @FUNCTION: _rebar_find_dep
+# @INTERNAL
+# @USAGE: <project_name>
+# @RETURN: 0 success, 1 dependency not found, 2 multiple versions found
+# @DESCRIPTION:
+# Find a Erlang package/project by name in Erlang lib directory. Project
+# directory is usually suffixed with version. It is matched to '<project_name>'
+# or '<project_name>-*'.
+_rebar_find_dep() {
+ local pn="${1}"
+ local p
+ local result
+
+ pushd "${EPREFIX}$(get_erl_libs)" >/dev/null || return 1
+ for p in ${pn} ${pn}-*; do
+ if [[ -d ${p} ]]; then
+ # Ensure there's at most one matching.
+ [[ ${result} ]] && return 2
+ result="${p}"
+ fi
+ done
+ popd >/dev/null || die
+
+ [[ ${result} ]] || return 1
+ echo "${result}"
+}
+
+# @FUNCTION: erebar3
+# @USAGE: <targets>
+# @DESCRIPTION:
+# Run rebar with verbose flag. Die on failure.
+erebar3() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ (( $# > 0 )) || die "erebar: at least one target is required"

Oversight, should be ${FUNCNAME} instead of "erebar" (old name).

+
+ case ${1} in
+ eunit|ct)
+ local -x ERL_LIBS="." ;;
+ *)
+ local -x ERL_LIBS="${EPREFIX}$(get_erl_libs)" ;;
+ esac
+
+ edo rebar3 "$@"
+}
+
+# @FUNCTION: rebar3_src_prepare
+# @DESCRIPTION:
+# Prevent rebar from fetching and compiling dependencies. Set version in

Ditto.

+# project description file if it's not set.
+#
+# Existence of rebar.config is optional, but file description file must exist >+# at 'src/${PN}.app.src'.
+rebar3_src_prepare() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ default_src_prepare
+ rebar_set_vsn
+
+ if [[ -f rebar.lock ]]; then
+ rm rebar.lock || die
+ fi
+
+ if [[ -f rebar.config ]]; then
+ rebar_disable_coverage
+ rebar_remove_deps
+ fi
+}
+
+# @FUNCTION: rebar3_src_configure
+# @DESCRIPTION:
+# Configure with ERL_LIBS set.
+rebar3_src_configure() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ local -x ERL_LIBS="${EPREFIX}$(get_erl_libs)"
+ default_src_configure
+}
+
+# @FUNCTION: rebar3_src_compile
+# @DESCRIPTION:
+# Compile project with rebar.

Ditto.

+rebar3_src_compile() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ erebar3 as "${REBAR_PROFILE}" release --all
+}
+
+# @FUNCTION: rebar3_src_test
+# @DESCRIPTION:
+# Run unit tests.
+rebar3_src_test() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ erebar3 eunit -v
+}
+
+# @FUNCTION: rebar3_install_lib
+# @USAGE: <dir>
+# @DESCRIPTION:
+# Install BEAM files, include headers and native libraries.
+#
+# Function expects that project conforms to Erlang/OTP structure. >+rebar3_install_lib() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ local dest="$(get_erl_libs)/${P}"
+
+ pushd "${1?}" >/dev/null || die
+ for dir in ebin include priv; do
+ if [[ -d ${dir} && ! -L ${dir} ]]; then
+ cp -pR "${dir}" "${ED%/}${dest}/" || die "failed to install ${dir}/"
+ fi
+ done
+ popd >/dev/null || die
+}
+
+# @FUNCTION: rebar3_src_install
+# @DESCRIPTION:
+# Install built release or library.
+#
+# Function expects that project conforms to Erlang/OTP structure. >+rebar3_src_install() {
+ debug-print-function ${FUNCNAME} "${@}"
+
+ pushd "_build/${REBAR_PROFILE}" >/dev/null || die
+ if [[ -d rel/${PN} ]]; then
+ if ! declare -f rebar3_install_release >/dev/null; then
+ die "${FUNCNAME}: a custom function named 'rebar3_install_release' is required to install a release"
+ fi
+ pushd rel/${PN} >/dev/null || die
+ rebar3_install_release || die
+ popd >/dev/null || die
+ elif [[ -d lib/${PN} ]]; then
+ rebar3_install_lib lib/${PN}
+ else
+ die "No releases or libraries to install"
+ fi
+ popd >/dev/null || die
+
+ einstalldocs
+}
+
+fi
+
+EXPORT_FUNCTIONS src_prepare src_compile src_test src_install
--
2.44.2

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On 7/10/24 11:38 PM, Anna (cybertailor) Vyalkova wrote:

On 2024-07-10 09:19, Florian Schmaus wrote:

From: Florian Schmaus <flow@gentoo.org>

Add a new eclass for dev-util/rebar:3, based on the work of Anna
Vyalkova in ::guru (thanks!).

There's also rebar3.eclass in lanodanOverlay, hereby CC-ing Haelwenn on
this.

The Erlang/OTP ecosystem is moving to Rebar3. Upstreams start to drop
support for Rebar2, or at least consider it.

Hello.

I can't find the first part of this email thread, including the actual submission of the eclass for review to the mailing list. Was this a
private conversation?

I notice that it *has* been committed by Flow to ::gentoo already, and
your request for Haelwenn's feedback hasn't yet been answered.


--
Eli Schwartz


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