[build] install new platform api on host (#3282)

slave.mk: add SONIC_PLATFORM_API_PY2 as dependency of host
sonic_debian_extension.j2: install sonic_daemon_base and Mellanox-specific sonic_platform on host
mlnx-platform-api.mk: export mlnx_platform_api_py2_wheel_path for sonic_debian_extension.j2
sonic-daemon-base.mk: export daemon_base_py2_wheel_path for sonic_debian_extension.j2
daemon_base.py: hind unnecessary dependency of swss_common on host

files/build_templates/sonic_debian_extension.j2

@@ -116,6 +116,12 @@ sudo cp {{platform_common_py2_wheel_path}} $FILESYSTEM_ROOT/$PLATFORM_COMMON_PY2
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install $PLATFORM_COMMON_PY2_WHEEL_NAME
 sudo rm -rf $FILESYSTEM_ROOT/$PLATFORM_COMMON_PY2_WHEEL_NAME
 
+# Install sonic-daemon-base Python 2 package
+DAEMON_BASE_PY2_WHEEL_NAME=$(basename {{daemon_base_py2_wheel_path}})
+sudo cp {{daemon_base_py2_wheel_path}} $FILESYSTEM_ROOT/$DAEMON_BASE_PY2_WHEEL_NAME
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install $DAEMON_BASE_PY2_WHEEL_NAME
+sudo rm -rf $FILESYSTEM_ROOT/$DAEMON_BASE_PY2_WHEEL_NAME
+
 # Install built Python Click package (and its dependencies via 'apt-get -y install -f')
 # Do this before installing sonic-utilities so that it doesn't attempt to install
 # an older version as part of its dependencies
@@ -377,6 +383,12 @@ sudo cp $files_path/$ISSU_VERSION_FILE $FILESYSTEM_ROOT/etc/mlnx/issu-version
 sudo cp $files_path/$MLNX_FFB_SCRIPT $FILESYSTEM_ROOT/usr/bin/mlnx-ffb.sh
 j2 platform/mellanox/mlnx-fw-upgrade.j2 | sudo tee $FILESYSTEM_ROOT/usr/bin/mlnx-fw-upgrade.sh
 sudo chmod 755 $FILESYSTEM_ROOT/usr/bin/mlnx-fw-upgrade.sh
+
+# Install mlnx-sonic-platform-common Python 2 package
+MLNX_PLATFORM_COMMON_PY2_WHEEL_NAME=$(basename {{mlnx_platform_api_py2_wheel_path}})
+sudo cp {{mlnx_platform_api_py2_wheel_path}} $FILESYSTEM_ROOT/$MLNX_PLATFORM_COMMON_PY2_WHEEL_NAME
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install $MLNX_PLATFORM_COMMON_PY2_WHEEL_NAME
+sudo rm -rf $FILESYSTEM_ROOT/$MLNX_PLATFORM_COMMON_PY2_WHEEL_NAME
 {% endif %}
 
 {%- if SONIC_ROUTING_STACK == "frr" %}

platform/mellanox/mlnx-platform-api.mk

@@ -5,3 +5,4 @@ $(SONIC_PLATFORM_API_PY2)_SRC_PATH = $(PLATFORM_PATH)/mlnx-platform-api
 $(SONIC_PLATFORM_API_PY2)_PYTHON_VERSION = 2
 SONIC_PYTHON_WHEELS += $(SONIC_PLATFORM_API_PY2)
 
+export mlnx_platform_api_py2_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_PLATFORM_API_PY2))"

rules/sonic-daemon-base.mk

@@ -5,3 +5,4 @@ $(SONIC_DAEMON_BASE_PY2)_SRC_PATH = $(SRC_PATH)/sonic-daemon-base
 $(SONIC_DAEMON_BASE_PY2)_PYTHON_VERSION = 2
 SONIC_PYTHON_WHEELS += $(SONIC_DAEMON_BASE_PY2)
 
+export daemon_base_py2_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_DAEMON_BASE_PY2))"

slave.mk

@@ -622,7 +622,8 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
         $(addprefix $(PYTHON_DEBS_PATH)/,$(SONIC_UTILS)) \
         $(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_CONFIG_ENGINE)) \
         $(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_PLATFORM_COMMON_PY2)) \
-        $(addprefix $(PYTHON_WHEELS_PATH)/,$(REDIS_DUMP_LOAD_PY2))
+        $(addprefix $(PYTHON_WHEELS_PATH)/,$(REDIS_DUMP_LOAD_PY2)) \
+        $(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_PLATFORM_API_PY2))
 	$(HEADER)
 	# Pass initramfs and linux kernel explicitly. They are used for all platforms
 	export debs_path="$(STRETCH_DEBS_PATH)"

src/sonic-daemon-base/sonic_daemon_base/daemon_base.py

@@ -7,7 +7,6 @@ try:
     import os
     import sys
     import syslog
-    from swsscommon import swsscommon
 except ImportError, e:
     raise ImportError (str(e) + " - required module not found")
 
@@ -38,6 +37,7 @@ EEPROM_CLASS_NAME = 'board'
 #
 
 def db_connect(db):
+    from swsscommon import swsscommon
     return swsscommon.DBConnector(db,
                                   REDIS_HOSTNAME,
                                   REDIS_PORT,