Alembic: 1.5.0 missing templates?

[WilliamMayor]

Describe the bug
After a fresh install on a new project I can't run alembic init because it's missing the 'generic' template. If I try to run list_templates I get an error that the templates directory can't be found.

Expected behavior
Alembic initialises the environment.

To Reproduce

python3 -m venv venv
. venv/bin/activate
pip install alembic==1.5.0
alembic init migrations

Error

$ alembic init migrations
  FAILED: No such template 'generic'
$ alembic list_templates
Available templates:

Traceback (most recent call last):
  File "/usr/local/bin/alembic", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/alembic/config.py", line 559, in main
    CommandLine(prog=prog).main(argv=argv)
  File "/usr/local/lib/python3.9/site-packages/alembic/config.py", line 553, in main
    self.run_cmd(cfg, options)
  File "/usr/local/lib/python3.9/site-packages/alembic/config.py", line 530, in run_cmd
    fn(
  File "/usr/local/lib/python3.9/site-packages/alembic/command.py", line 17, in list_templates
    for tempname in os.listdir(config.get_template_directory()):
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/lib/python3.9/site-packages/alembic/templates'

This error is copied directly from the docker image I'm working in that doesn't have the venv from the above example.

Versions.

• OS: Debian GNU/Linux 10 (buster)
• Python: 3.9.1
• Alembic: 1.5.0
• SQLAlchemy: 1.3.22
• Database: PostgreSQL
• DBAPI: psycopg2

Have a nice day!

[zzzeek]

we switched from setup.py to setup.cfg for our metadata and I forgot to test this. will have 1.5.1 release ASAP

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the master branch:

fix erroneous package_dir directive https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/2488

[zzzeek]

OK 1.5.1 is released, I just did a full pip install here and it seems to work. feel free to try it out!