migrations: Deprecate migration 0060 into a noop.

This ancient migration imports boto, which interferes
with our upgrade to boto3.

> git name-rev a32f666f5c
a32f666f5c tags/1.6.0~2384

We can safely assume nobody is running servers on <1.6.0; there are no
supported platforms in common with 1.6.0 anyway.

zerver/migrations/0060_move_avatars_to_be_uid_based.py

@@ -1,93 +1,8 @@
 # Generated by Django 1.10.5 on 2017-02-27 17:03
-import os
-from typing import Text
-
-from boto.s3.connection import S3Connection
-from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
-from django.db.migrations.state import StateApps
-
-from zerver.lib.avatar_hash import user_avatar_hash, user_avatar_path
-
-
-def mkdirs(path: Text) -> None:
-    dirname = os.path.dirname(path)
-    if not os.path.isdir(dirname):
-        os.makedirs(dirname)
-
-class MissingAvatarException(Exception):
-    pass
-
-def move_local_file(type: Text, path_src: Text, path_dst: Text) -> None:
-    src_file_path = os.path.join(settings.LOCAL_UPLOADS_DIR, type, path_src)
-    dst_file_path = os.path.join(settings.LOCAL_UPLOADS_DIR, type, path_dst)
-    if os.path.exists(dst_file_path):
-        return
-    if not os.path.exists(src_file_path):
-        # This is likely caused by a user having previously changed their email
-        raise MissingAvatarException()
-    mkdirs(dst_file_path)
-    os.rename(src_file_path, dst_file_path)
-
-def move_avatars_to_be_uid_based(apps: StateApps, schema_editor: DatabaseSchemaEditor) -> None:
-    user_profile_model = apps.get_model('zerver', 'UserProfile')
-    if settings.LOCAL_UPLOADS_DIR is not None:
-        for user_profile in user_profile_model.objects.filter(avatar_source="U"):
-            src_file_name = user_avatar_hash(user_profile.email)
-            dst_file_name = user_avatar_path(user_profile)
-            try:
-                move_local_file('avatars', src_file_name + '.original', dst_file_name + '.original')
-                move_local_file('avatars', src_file_name + '-medium.png', dst_file_name + '-medium.png')
-                move_local_file('avatars', src_file_name + '.png', dst_file_name + '.png')
-            except MissingAvatarException:
-                # If the user's avatar is missing, it's probably
-                # because they previously changed their email address.
-                # So set them to have a gravatar instead.
-                user_profile.avatar_source = "G"
-                user_profile.save(update_fields=["avatar_source"])
-    else:
-        conn = S3Connection(settings.S3_KEY, settings.S3_SECRET_KEY)
-        bucket_name = settings.S3_AVATAR_BUCKET
-        bucket = conn.get_bucket(bucket_name, validate=False)
-        for user_profile in user_profile_model.objects.filter(avatar_source="U"):
-            uid_hash_path = user_avatar_path(user_profile)
-            email_hash_path = user_avatar_hash(user_profile.email)
-            if bucket.get_key(uid_hash_path):
-                continue
-            if not bucket.get_key(email_hash_path):
-                # This is likely caused by a user having previously changed their email
-                # If the user's avatar is missing, it's probably
-                # because they previously changed their email address.
-                # So set them to have a gravatar instead.
-                user_profile.avatar_source = "G"
-                user_profile.save(update_fields=["avatar_source"])
-                continue
-
-            bucket.copy_key(uid_hash_path + ".original",
-                            bucket_name,
-                            email_hash_path + ".original")
-            bucket.copy_key(uid_hash_path + "-medium.png",
-                            bucket_name,
-                            email_hash_path + "-medium.png")
-            bucket.copy_key(uid_hash_path,
-                            bucket_name,
-                            email_hash_path)
-
-        # From an error handling sanity perspective, it's best to
-        # start deleting after everything is copied, so that recovery
-        # from failures is easy (just rerun one loop or the other).
-        for user_profile in user_profile_model.objects.filter(avatar_source="U"):
-            bucket.delete_key(user_avatar_hash(user_profile.email) + ".original")
-            bucket.delete_key(user_avatar_hash(user_profile.email) + "-medium.png")
-            bucket.delete_key(user_avatar_hash(user_profile.email))
 
 class Migration(migrations.Migration):
 
     dependencies = [
         ('zerver', '0059_userprofile_quota'),
     ]
-
-    operations = [
-        migrations.RunPython(move_avatars_to_be_uid_based)
-    ]