perpatch: Echo MAKE_PARALLEL_* var before build

VPP uses MAKE_PARALLEL_FLAGS or MAKE_PARALLEL_JOBS to limit the number
of cpus to use during build, so emit a line on stdout if it's used.

Change-Id: I669398d474d172abb6c848a45f24f1bdd56990d8
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>

1 files changed, 15 insertions, 1 deletions

diff --git a/resources/libraries/bash/function/per_patch.sh b/resources/libraries/bash/function/per_patch.sh
index abf2cac688..8b97780cec 100644
--- a/resources/libraries/bash/function/per_patch.sh
+++ b/resources/libraries/bash/function/per_patch.sh
@@ -1,4 +1,5 @@
-# Copyright (c) 2018 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# Copyright (c) 2020 PANTHEON.tech s.r.o.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
@@ -73,6 +74,8 @@ function build_vpp_ubuntu_amd64 () {
     # Arguments:
     # - ${1} - String identifier for echo, can be unset.
     # Variables read:
+    # - MAKE_PARALLEL_FLAGS - Make flags when building VPP.
+    # - MAKE_PARALLEL_JOBS - Number of cores to use when building VPP.
     # - VPP_DIR - Path to existing directory, parent to accessed directories.
     # Directories updated:
     # - ${VPP_DIR} - Whole subtree, many files (re)created by the build process.
@@ -82,6 +85,17 @@ function build_vpp_ubuntu_amd64 () {
     set -exuo pipefail
 
     cd "${VPP_DIR}" || die "Change directory command failed."
+    if [ -n "${MAKE_PARALLEL_FLAGS-}" ]; then
+        echo "Building VPP. Number of cores for build set with" \
+             "MAKE_PARALLEL_FLAGS='${MAKE_PARALLEL_FLAGS}'."
+    elif [ -n "${MAKE_PARALLEL_JOBS-}" ]; then
+        echo "Building VPP. Number of cores for build set with" \
+             "MAKE_PARALLEL_JOBS='${MAKE_PARALLEL_JOBS}'."
+    else
+        echo "Building VPP. Number of cores not set, " \
+             "using build default ($(grep -c ^processor /proc/cpuinfo))."
+    fi
+
     make UNATTENDED=y pkg-verify || die "VPP build using make pkg-verify failed."
     echo "* VPP ${1-} BUILD SUCCESSFULLY COMPLETED" || {
         die "Argument not found."