Add Pulp 2 models for RPM and Errata

closes #6172
https://pulp.plan.io/issues/6172

CHANGES/6172.misc

@@ -0,0 +1 @@
+Add models for RPM and Errata to communicate with Pulp 2.

pulp_2to3_migration/app/plugin/rpm/pulp2_models.py

@@ -0,0 +1,158 @@
+import logging
+
+from mongoengine import (
+    BooleanField,
+    DictField,
+    IntField,
+    ListField,
+    StringField,
+)
+
+from pulp_2to3_migration.pulp2.base import (
+    ContentUnit,
+    FileContentUnit,
+)
+
+_logger = logging.getLogger(__name__)
+
+
+class NonMetadataPackage(FileContentUnit):
+    """
+    An abstract Pulp 2 model to be subclassed by packages which are not metadata.
+    """
+
+    version = StringField(required=True)
+    release = StringField(required=True)
+    checksum = StringField(required=True)
+    checksumtype = StringField(required=True)
+    checksums = DictField()
+    signing_key = StringField()  # not used in the migration plugin
+
+    version_sort_index = StringField()  # not used in the migration plugin
+    release_sort_index = StringField()  # not used in the migration plugin
+
+    meta = {
+        'abstract': True,
+    }
+
+
+class RpmBase(NonMetadataPackage):
+    """
+    An abstract model designed to be sub-classed by both RPM and SRPM.
+
+    RPM amd SRPM package types are similar. Most fields map to metadata fields in the RPM package
+    format.
+    """
+
+    # Unit Key Fields
+    name = StringField(required=True)
+    epoch = StringField(required=True)
+    version = StringField(required=True)
+    release = StringField(required=True)
+    arch = StringField(required=True)
+
+    # Other Fields
+    build_time = IntField()  # not used in the migration plugin
+    buildhost = StringField()  # not used in the migration plugin
+    vendor = StringField()  # not used in the migration plugin
+    size = IntField()
+    base_url = StringField()  # not used in the migration plugin
+    filename = StringField()
+    relative_url_path = StringField()  # not used in the migration plugin
+    relativepath = StringField()  # not used in the migration plugin
+    group = StringField()  # not used in the migration plugin
+
+    provides = ListField()  # not used in the migration plugin
+    files = DictField()  # not used in the migration plugin
+    repodata = DictField(default={})
+    description = StringField()  # not used in the migration plugin
+    header_range = DictField()  # not used in the migration plugin
+    sourcerpm = StringField()  # not used in the migration plugin
+    license = StringField()  # not used in the migration plugin
+    changelog = ListField()  # not used in the migration plugin
+    url = StringField()  # not used in the migration plugin
+    summary = StringField()  # not used in the migration plugin
+    time = IntField()  # not used in the migration plugin
+    requires = ListField()  # not used in the migration plugin
+    recommends = ListField()  # not used in the migration plugin
+
+    unit_key_fields = ('name', 'epoch', 'version', 'release', 'arch', 'checksumtype', 'checksum')
+
+    meta = {
+        'indexes': [
+            "name", "epoch", "version", "release", "arch", "filename", "checksum", "checksumtype",
+            "version_sort_index", ("version_sort_index", "release_sort_index")
+        ],
+        'abstract': True,
+    }
+
+
+class RPM(RpmBase):
+    """
+    A model for Pulp 2 RPM content type.
+
+    It will become a Package content type in Pulp 3 world.
+    """
+    TYPE_ID = 'rpm'
+
+    # For backward compatibility
+    _ns = StringField(default='units_rpm')
+    _content_type_id = StringField(required=True, default=TYPE_ID)
+
+    unit_display_name = 'RPM'
+    unit_description = 'RPM'
+    unit_referenced_types = ['erratum']
+
+    is_modular = BooleanField(default=False)
+
+    meta = {
+        'collection': 'units_rpm',
+        'allow_inheritance': False,
+    }
+
+
+class Errata(ContentUnit):
+    """
+    A model for Pulp 2 Erratum content type.
+
+    It will become an Advisory content type in Pulp 3 world.
+    """
+    TYPE_ID = 'erratum'
+
+    errata_id = StringField(required=True)
+    status = StringField()
+    updated = StringField(required=True, default='')
+    description = StringField()
+    issued = StringField()
+    pushcount = StringField()
+    references = ListField()
+    reboot_suggested = BooleanField()
+    relogin_suggested = BooleanField()
+    restart_suggested = BooleanField()
+    errata_from = StringField(db_field='from')
+    severity = StringField()
+    rights = StringField()
+    version = StringField()
+    release = StringField()
+    type = StringField()
+    pkglist = ListField()
+    title = StringField()
+    solution = StringField()
+    summary = StringField()
+
+    # For backward compatibility
+    _ns = StringField(default='units_erratum')
+    _content_type_id = StringField(required=True, default='erratum')
+
+    unit_key_fields = ('errata_id',)
+    unit_display_name = 'Erratum'
+    unit_description = 'Erratum advisory information'
+    unit_referenced_types = ['rpm']
+
+    meta = {
+        'indexes': [
+            "version", "release", "type", "status", "updated", "issued", "severity", "references"
+        ],
+        'collection': 'units_erratum',
+        'allow_inheritance': False,
+    }