dnf: add support for python2

Some stx components like sw-patch requres python-dnf but it's
using python2, and other stx components depend on sw-patch
are using python2 as well, so add support of python2 for
dnf for now, stx components will be move to python3 in
the future.

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Babak Sarashki <Babak.SarAshki@windriver.com>

meta-stx-integ/recipes-devtools/dnf/dnf_4.1.0.bbappend

@@ -0,0 +1,67 @@
+DEPENDS += "\
+    python-native \
+    "
+
+EXTRA_OECMAKE_PY2 = " \
+    -DWITH_MAN=0 \
+    -DPYTHON_INSTALL_DIR=${libdir}/python2.7/site-packages \
+    -DPYTHON_DESIRED:FILEPATH=${STAGING_BINDIR_NATIVE}/python-native/python \
+    "
+
+RDEPENDS_${PN}_class-target += " \
+    python-codecs \
+    python-compression \
+    python-core \
+    python-curses \
+    python-distutils \
+    python-email \
+    python-fcntl \
+    python-iniparse \
+    python-json \
+    python-logging \
+    python-misc \
+    python-netclient \
+    python-pygpgme \
+    python-pyliblzma \
+    python-shell \
+    python-sqlite3 \
+    python-threading \
+    python2-rpm \
+    "
+
+do_configure_append() {
+	rm -rf ${B}/build-py2
+	mkdir -p ${B}/build-py2
+	cd ${B}/build-py2
+
+	cmake \
+	  ${OECMAKE_GENERATOR_ARGS} \
+	  $oecmake_sitefile \
+	  ${OECMAKE_SOURCEPATH} \
+	  -DCMAKE_INSTALL_PREFIX:PATH=${prefix} \
+	  -DCMAKE_INSTALL_SYSCONFDIR:PATH=${sysconfdir} \
+	  -DCMAKE_INSTALL_SO_NO_EXE=0 \
+	  -DCMAKE_TOOLCHAIN_FILE=${WORKDIR}/toolchain.cmake \
+	  -DCMAKE_NO_SYSTEM_FROM_IMPORTED=1 \
+	  ${EXTRA_OECMAKE_PY2} \
+	  -Wno-dev
+}
+
+cmake_runcmake_build_py2() {
+	bbnote ${DESTDIR:+DESTDIR=${DESTDIR} }VERBOSE=1 cmake --build '${B}/build-py2' "$@" -- ${EXTRA_OECMAKE_BUILD}
+	eval ${DESTDIR:+DESTDIR=${DESTDIR} }VERBOSE=1 cmake --build '${B}/build-py2' "$@" -- ${EXTRA_OECMAKE_BUILD}
+}
+
+do_compile_append() {
+	cd ${B}/build-py2
+	cmake_runcmake_build_py2 --target ${OECMAKE_TARGET_COMPILE}
+}
+
+do_install_append() {
+	cd ${B}/build-py2
+	DESTDIR='${D}' cmake_runcmake_build_py2 --target ${OECMAKE_TARGET_INSTALL}
+
+	# add a symlink for yum
+	lnr ${D}/${bindir}/dnf-2 ${D}/${bindir}/yum
+}
+