from trac.db import Table,Column,Index,DatabaseManager
from trac.core import TracError
from trac.versioncontrol.cache import CACHE_YOUNGEST_REV
def do_upgrade(env, ver, cursor):
"""Modify the repository cache scheme (if needed)
Now we use the 'youngest_rev' entry in the system table
to explicitly store the youngest rev in the cache.
"""
db = env.get_db_cnx()
try:
repos = env.get_repository()
youngest = repos.get_youngest_rev_in_cache(db) or ''
except TracError: # no repository available
youngest = ''
# deleting first, for the 0.11dev and 0.10.4dev users
cursor.execute("DELETE FROM system WHERE name=%s",
(CACHE_YOUNGEST_REV,))
cursor.execute("INSERT INTO system (name, value) VALUES (%s, %s)",
(CACHE_YOUNGEST_REV, youngest))
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