ci/linux32: parameterise command to switch arch

In a later patch, the remaining of this command will be re-used for the
CI job for linux with musl libc.

Allow customisation of the emulator, now.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ci/run-linux32-build.sh

@@ -14,8 +14,17 @@ then
 	exit 1
 fi
 
+case "$jobname" in
+Linux32)
+	switch_cmd="linux32 --32bit i386"
+	;;
+*)
+	exit 1
+	;;
+esac
+
 # Update packages to the latest available versions
-linux32 --32bit i386 sh -c '
+command $switch_cmd sh -c '
     apt update >/dev/null &&
     apt install -y build-essential libcurl4-openssl-dev libssl-dev \
 	libexpat-dev gettext python >/dev/null
@@ -51,7 +60,7 @@ else
 fi
 
 # Build and test
-linux32 --32bit i386 su -m -l $CI_USER -c "
+command $switch_cmd su -m -l $CI_USER -c "
 	set -ex
 	export DEVELOPER='$DEVELOPER'
 	export DEFAULT_TEST_TARGET='$DEFAULT_TEST_TARGET'

ci/run-linux32-docker.sh

@@ -9,6 +9,7 @@ docker pull daald/ubuntu32:xenial
 
 # Use the following command to debug the docker build locally:
 # $ docker run -itv "${PWD}:/usr/src/git" --entrypoint /bin/bash daald/ubuntu32:xenial
+# root@container:/# export jobname=<jobname>
 # root@container:/# /usr/src/git/ci/run-linux32-build.sh <host-user-id>
 
 container_cache_dir=/tmp/travis-cache
@@ -21,6 +22,7 @@ docker run \
 	--env GIT_TEST_OPTS \
 	--env GIT_TEST_CLONE_2GB \
 	--env MAKEFLAGS \
+	--env jobname \
 	--env cache_dir="$container_cache_dir" \
 	--volume "${PWD}:/usr/src/git" \
 	--volume "$cache_dir:$container_cache_dir" \