Fix interactive delays in database migrations with no TTY (#12969)

Fix #12587

db/migrate/20170918125918_ids_to_bigints.rb

@@ -70,6 +70,7 @@ class IdsToBigints < ActiveRecord::Migration[5.1]
     included_columns << [:deprecated_preview_cards, :id] if table_exists?(:deprecated_preview_cards)
 
     # Print out a warning that this will probably take a while.
+    if $stdout.isatty
       say ''
       say 'WARNING: This migration may take a *long* time for large instances'
       say 'It will *not* lock tables for any significant time, but it may run'
@@ -85,6 +86,7 @@ class IdsToBigints < ActiveRecord::Migration[5.1]
         say "Continuing in #{i} second#{i == 1 ? '' : 's'}...", true
         sleep 1
       end
+    end
 
     tables = included_columns.map(&:first).uniq
     table_sizes = {}

db/migrate/20180528141303_fix_accounts_unique_index.rb

@@ -20,6 +20,7 @@ class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
   def up
+    if $stdout.isatty
       say ''
       say 'WARNING: This migration may take a *long* time for large instances'
       say 'It will *not* lock tables for any significant time, but it may run'
@@ -34,6 +35,7 @@ class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
         say "Continuing in #{i} second#{i == 1 ? '' : 's'}...", true
         sleep 1
       end
+    end
 
     duplicates = Account.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM accounts GROUP BY lower(username), lower(domain) HAVING count(*) > 1').to_hash
 

db/migrate/20181024224956_migrate_account_conversations.rb

@@ -62,6 +62,7 @@ class MigrateAccountConversations < ActiveRecord::Migration[5.2]
   end
 
   def up
+    if $stdout.isatty
       say ''
       say 'WARNING: This migration may take a *long* time for large instances'
       say 'It will *not* lock tables for any significant time, but it may run'
@@ -73,6 +74,7 @@ class MigrateAccountConversations < ActiveRecord::Migration[5.2]
         say "Continuing in #{i} second#{i == 1 ? '' : 's'}...", true
         sleep 1
       end
+    end
 
     migrated  = 0
     last_time = Time.zone.now