From 9832a2ed008908f66edf2fc64b2c6f9e98347e02 Mon Sep 17 00:00:00 2001
From: Zaiming Shi <zmstone@gmail.com>
Date: Sun, 31 Oct 2021 17:14:19 +0100
Subject: [PATCH] build: show linux distro in BUILT_ON info

---
 build                 | 17 +++--------------
 etc/BUILT_ON          |  2 +-
 rebar.config.erl      | 15 ++++++++++++++-
 scripts/get-distro.sh | 19 +++++++++++++++++++
 4 files changed, 37 insertions(+), 16 deletions(-)
 create mode 100755 scripts/get-distro.sh

diff --git a/build b/build
index ee60effb2..be4f88672 100755
--- a/build
+++ b/build
@@ -15,18 +15,7 @@ cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")"
 PKG_VSN="${PKG_VSN:-$(./pkg-vsn.sh)}"
 export PKG_VSN
 
-if [ "$(uname -s)" = 'Darwin' ]; then
-	SYSTEM=macos
-elif [ "$(uname -s)" = 'Linux' ]; then
-    if grep -q -i 'centos' /etc/*-release; then
-        DIST='centos'
-        VERSION_ID="$(rpm --eval '%{centos_ver}')"
-    else
-        DIST="$(sed -n '/^ID=/p' /etc/os-release | sed -r 's/ID=(.*)/\1/g' | sed 's/"//g')"
-        VERSION_ID="$(sed -n '/^VERSION_ID=/p' /etc/os-release | sed -r 's/VERSION_ID=(.*)/\1/g' | sed 's/"//g')"
-    fi
-    SYSTEM="$(echo "${DIST}${VERSION_ID}" | sed -r 's/([a-zA-Z]*)-.*/\1/g')"
-fi
+SYSTEM="$(./scripts/get-distro.sh)"
 
 ARCH="$(uname -m)"
 case "$ARCH" in
@@ -46,8 +35,8 @@ export ARCH
 ## Support RPM and Debian based linux systems
 ##
 if [ "$(uname -s)" = 'Linux' ]; then
-    case "${DIST:-}" in
-        ubuntu|debian|raspbian)
+    case "${SYSTEM:-}" in
+        ubuntu*|debian*|raspbian*)
             PKGERDIR='deb'
             ;;
         *)
diff --git a/etc/BUILT_ON b/etc/BUILT_ON
index 2997223fa..43a77ec87 100644
--- a/etc/BUILT_ON
+++ b/etc/BUILT_ON
@@ -1 +1 @@
-{{built_on_arch}}
+{{built_on_platform}}
diff --git a/rebar.config.erl b/rebar.config.erl
index 901027d2d..1000a2c92 100644
--- a/rebar.config.erl
+++ b/rebar.config.erl
@@ -173,11 +173,24 @@ relx(Vsn, RelType, PkgType) ->
     , {vm_args,false}
     , {release, {emqx, Vsn}, relx_apps(RelType)}
     , {overlay, relx_overlay(RelType)}
-    , {overlay_vars, [ {built_on_arch, rebar_utils:get_arch()}
+    , {overlay_vars, [ {built_on_platform, built_on()}
                      , {emqx_description, emqx_description(RelType, IsEnterprise)}
                      | overlay_vars(RelType, PkgType, IsEnterprise)]}
     ].
 
+built_on() ->
+    On = rebar_utils:get_arch(),
+    case distro() of
+        false -> On;
+        Distro -> On ++ "-" ++ Distro
+    end.
+
+distro() ->
+    case os:type() of
+        {unix, _} -> string:strip(os:cmd("scripts/get-distro.sh"), both, $\n);
+        _ -> false
+    end.
+
 emqx_description(cloud, true) -> "EMQ X Enterprise";
 emqx_description(cloud, false) -> "EMQ X Broker";
 emqx_description(edge, _) -> "EMQ X Edge".
diff --git a/scripts/get-distro.sh b/scripts/get-distro.sh
new file mode 100755
index 000000000..ae52abba3
--- /dev/null
+++ b/scripts/get-distro.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+## This script prints Linux distro name and its version number
+## e.g. macos, centos8, ubuntu20.04
+
+set -euo pipefail
+
+if [ "$(uname -s)" = 'Darwin' ]; then
+	echo 'macos'
+elif [ "$(uname -s)" = 'Linux' ]; then
+    if grep -q -i 'centos' /etc/*-release; then
+        DIST='centos'
+        VERSION_ID="$(rpm --eval '%{centos_ver}')"
+    else
+        DIST="$(sed -n '/^ID=/p' /etc/os-release | sed -r 's/ID=(.*)/\1/g' | sed 's/"//g')"
+        VERSION_ID="$(sed -n '/^VERSION_ID=/p' /etc/os-release | sed -r 's/VERSION_ID=(.*)/\1/g' | sed 's/"//g')"
+    fi
+    echo "${DIST}${VERSION_ID}" | sed -r 's/([a-zA-Z]*)-.*/\1/g'
+fi