Reduce logic in updategraph (#11010)

Why I did it
The dhcp_graph_url used by internal service is always set as "N/A". So we can make the updategraph logic short.

How I did it
Shorten 'if statement' logic for /tmp/dhcp_graph_url

files/image_config/updategraph/updategraph

@@ -35,100 +35,26 @@ if [ -e /usr/bin/ztp ] && [ "$(ztp status -c)" != "0:DISABLED" ]; then
     exit 0
 fi
 
-ACL_URL=$acl_src
+# "`cat /tmp/dhcp_graph_url`" is always "N/A"
-
+echo "No graph_url option in DHCP response. Skipping graph update and generating an empty configuration."
-if [ "$src" = "dhcp" ]; then
+PLATFORM=${PLATFORM:-`sonic-cfggen -H -v DEVICE_METADATA.localhost.platform`}
-    # Enable dhcp client on management port eth0
+if [ -f /etc/sonic/minigraph.xml ]; then
-    /sbin/dhclient -4 -v -pf /run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -I -df /var/lib/dhcp/dhclient6.eth0.leases eth0 &
-    disown
-
-    while [ ! -f /tmp/dhcp_graph_url ]; do
-        echo "Waiting for DHCP response..."
-        sleep 1
-    done
-
-    if [ "`cat /tmp/dhcp_graph_url`" = "N/A" ]; then
-        echo "No graph_url option in DHCP response. Skipping graph update and generating an empty configuration."
-        PLATFORM=${PLATFORM:-`sonic-cfggen -H -v DEVICE_METADATA.localhost.platform`}
-        if [ -f /etc/sonic/minigraph.xml ]; then
     sonic-cfggen -H -m /etc/sonic/minigraph.xml --preset empty > /tmp/device_meta.json
-        else
+else
     PRESET=(`head -n 1 /usr/share/sonic/device/$PLATFORM/default_sku`)
     sonic-cfggen -H -k ${PRESET[0]} --preset empty > /tmp/device_meta.json
-        fi
+fi
-        if [ -f /etc/sonic/init_cfg.json ]; then
+if [ -f /etc/sonic/init_cfg.json ]; then
     sonic-cfggen -j /tmp/device_meta.json -j /etc/sonic/init_cfg.json --print-data > /etc/sonic/config_db.json
-        else
+else
     cp -f /tmp/device_meta.json /etc/sonic/config_db.json
-        fi
+fi
-        sonic-db-cli CONFIG_DB FLUSHDB
+sonic-db-cli CONFIG_DB FLUSHDB
-        sonic-cfggen -j /etc/sonic/config_db.json --write-to-db
+sonic-cfggen -j /etc/sonic/config_db.json --write-to-db
-        sonic-db-cli CONFIG_DB SET "CONFIG_DB_INITIALIZED" "1"
+sonic-db-cli CONFIG_DB SET "CONFIG_DB_INITIALIZED" "1"
-        if [ "$dhcp_as_static" = "true" ]; then
+if [ "$dhcp_as_static" = "true" ]; then
     sed -i "/enabled=/d" /etc/sonic/updategraph.conf
     echo "enabled=false" >> /etc/sonic/updategraph.conf
-        fi
-        exit 0
-    fi
-
-
-    HOSTNAME=`hostname -s`
-    GRAPH_URL=`sonic-cfggen -t /tmp/dhcp_graph_url -a "{\"hostname\": \"$HOSTNAME\"}"`
-    URL_REGEX='^(https?|ftp|file)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]$'
-    if [[ ! $GRAPH_URL =~ $URL_REGEX ]]; then
-        echo "\"$GRAPH_URL\" is not a valid url. Skipping graph update."
-        exit 0
-    fi
-    if [ "$dhcp_as_static" = "true" ]; then
-        sed -i "/src=/d" /etc/sonic/updategraph.conf
-        echo "src=\"$GRAPH_URL\"" >> /etc/sonic/updategraph.conf
-    fi
-
-    if [ -f /tmp/dhcp_acl_url ]; then
-        ACL_URL=`sonic-cfggen -t /tmp/dhcp_acl_url -a "{\"hostname\": \"$HOSTNAME\"}"`
-        if [[ ! $ACL_URL =~ $URL_REGEX ]]; then
-            echo "\"$ACL_URL\" is not a valid url. Skipping acl update."
-            ACL_URL=""
-        fi
-        if [ "$dhcp_as_static" = "true" ]; then
-            sed -i "/acl_src=/d" /etc/sonic/updategraph.conf
-            echo "acl_src=\"$ACL_URL\"" >> /etc/sonic/updategraph.conf
-        fi
-    fi
-else
-    GRAPH_URL=$src
 fi
-
+exit 0
-if [ -f /etc/sonic/minigraph.xml ]; then
-    echo "Renaming minigraph.xml to minigraph.old"
-    mv /etc/sonic/minigraph.xml /etc/sonic/minigraph.old
-fi
-
-echo "Getting minigraph from $GRAPH_URL"
-
-while true; do
-    curl -f $GRAPH_URL -o /etc/sonic/minigraph.xml --connect-timeout 15 && break
-    sleep 5
-done
-
-if [ -n "$ACL_URL" ]; then
-    if [ -f /etc/sonic/acl.json ]; then
-        echo "Renaming acl.json to acl.json.old"
-        mv /etc/sonic/acl.json /etc/sonic/acl.json.old
-    fi
-    echo "Getting ACL config from $ACL_URL"
-
-    while true; do
-        curl -f $ACL_URL -o /etc/sonic/acl.json --connect-timeout 15 && break
-        sleep 5
-    done
-else
-    echo "Skip ACL config download."
-fi
-
-reload_minigraph
-
-# Mark as disabled after graph is successfully downloaded
-sed -i "/enabled=/d" /etc/sonic/updategraph.conf
-echo "enabled=false" >> /etc/sonic/updategraph.conf