Add sonic validate command for YANG-based config_db.json validation

.flake8

@@ -5,4 +5,4 @@ exclude =
     files/disable
     files/generate
     files/import
-ignore = F841 W503 E721 E722 E226
+ignore = F841 W503 E721 E722 E226 E203

Containerfile

@@ -58,6 +58,7 @@ uv pip install --no-cache --system -r /src/requirements.ansible.txt
 uv pip install --no-cache --system -r /src/requirements.openstack-image-manager.txt
 uv pip install --no-cache --system -r /src/requirements.openstack-flavor-manager.txt
 uv pip install --no-cache --system -r /src/requirements.netbox-manager.txt
+uv pip install --no-cache --system -r /src/requirements.sonic.txt
 
 # install python-osism
 uv pip install --no-cache --system /src

Pipfile

@@ -31,6 +31,7 @@ pottery = "==3.0.1"
 prompt-toolkit = "==3.0.52"
 pyang = "==2.7.1"
 pynetbox = "==7.6.1"
+sonic-yang-mgmt = {git = "https://github.com/sonic-net/sonic-buildimage.git", ref = "9ef3658e5315002006ea1d6da2524ad14f77c928", subdirectory = "src/sonic-yang-mgmt"}
 pytest-testinfra = "==10.2.2"
 python-dateutil = "==2.9.0.post0"
 redfish = "==3.3.5"

files/sonic/yang_models/sonic-extension.yang

@@ -0,0 +1,25 @@
+module sonic-extension {
+
+    yang-version 1.1;
+
+    namespace "http://github.com/sonic-net/sonic-extension";
+    prefix sonic-extension;
+
+    description "Extension yang Module for SONiC OS";
+
+    revision 2019-07-01 {
+        description "First Revision";
+    }
+
+    /* For complete guide of using these extensions in SONiC yangs, refer
+    SONiC yang guidelines at
+    https://github.com/Azure/SONiC/blob/master/doc/mgmt/SONiC_YANG_Model_Guidelines.md */
+
+    extension db-name {
+        description "DB name, e.g. APPL_DB, CONFIG_DB";
+        argument "value";
+    }
+
+
+
+}

files/sonic/yang_models/sonic-policer.yang

@@ -0,0 +1,125 @@
+
+/* this is sonic py yang model */
+
+module sonic-policer {
+
+	yang-version 1.1;
+
+	namespace "http://github.com/sonic-net/sonic-policer";
+	prefix policer;
+
+	import sonic-types {
+		prefix stypes;
+	}
+
+	description "Policer YANG Module for SONiC OS";
+
+	revision 2022-02-03 {
+		description
+			"First Revision";
+	}
+
+	container sonic-policer {
+		container POLICER {
+			list POLICER_LIST {
+				key name;
+
+				leaf name {
+					type string;
+					description "Policer name";
+				}
+
+				leaf meter_type {
+					mandatory true;
+					type stypes:meter_type;
+					description "Policer meter type";
+				}
+
+				leaf mode {
+					mandatory true;
+                                        type stypes:policer_mode;
+					description "Policer mode";
+				}
+
+  				leaf color {
+                                        type stypes:policer_color_source;
+					description "Policer color Source";
+				}
+
+				leaf cir {
+					type uint64;
+					description
+						"Committed information rate for the dual-rate token
+						bucket policer.  This value represents the rate at which
+						tokens are added to the primary bucket. Unit is bytes/sec
+						or packets/sec based on meter_type";
+				}
+
+				leaf cbs {
+					must "((current()/../cir) and (current()/../cir > 0))" {
+						error-message "cbs can't be configured without cir.";
+					}
+					must "(current() >= current()/../cir)" {
+						error-message "cbs must be greater than or equal to cir";
+					}
+					type uint64;
+					description
+						"Committed burst size for the dual-rate token bucket
+						policer.  This value represents the depth of the token
+						bucket. Unit is bytes or packets based on meter_type";
+				}
+
+				leaf pir {
+					when "current()/../mode = 'tr_tcm'";
+					must "((current()/../cir) and (current()/../cir > 0))" {
+						error-message "pir can't be configured without cir.";
+					}
+					must "(current() >= current()/../cir)" {
+						error-message "pir must be greater than or equal to cir";
+					}
+					type uint64;
+					description
+						"Peak information rate for the dual-rate token bucket
+						policer.  This value represents the rate at which tokens
+						are added to the secondary bucket. Unit is bytes/sec or
+						packets/sec based on meter_type";
+				}
+
+				leaf pbs {
+					when "((current()/../mode = 'sr_tcm') or (current()/../mode = 'tr_tcm'))";
+					must "((not(current()/../cbs)) or (current() >= current()/../cbs))" {
+						error-message "pbs must be greater than or equal to cbs";
+					}
+					type uint64;
+					description
+						"Excess burst size for the dual-rate token bucket policer.
+						This value represents the depth of the secondary bucket. Unit
+						is bytes or packets based on meter_type";
+				}
+
+				leaf green_packet_action {
+					type stypes:policer_packet_action;
+					default "forward";
+					description "Green action";
+				}
+
+				leaf yellow_packet_action {
+					when "((current()/../mode = 'sr_tcm') or (current()/../mode = 'tr_tcm'))";
+					type stypes:policer_packet_action;
+					default "forward";
+					description "Yellow action";
+				}
+
+				leaf red_packet_action {
+					type stypes:policer_packet_action;
+					default "forward";
+					description "Red action";
+				}
+			}
+			/* end of list POLICER_LIST */
+		}
+		/* end of container POLICER */
+	}
+	/* end of top level container */
+}
+/* end of module sonic-policer */