Upgrading a Lino production site¶

This document gives generic instructions for upgrading a Lino production site to a new version. This procedure is suitable for smaller sites with one contact person. See Installing a preview site for are more sophisticated approach on sites with many users. See also Data migrations à la Lino for technical background information.

Go to your project directory:
```
$ go myproject
```
See go if you don't know that command.
Activate the python environment (we usually have a shell alias a which expands to . env/bin/activate):
```
$ a
```

Stop any services that might want to write to the database (web server, supervisor):

$ sudo service apache2 stop  # not needed when the server runs nginx
$ sudo service supervisor stop

Run make_snapshot.sh to make a snapshot of your database:
```
$ ./make_snapshot.sh
```
See Making a snapshot of a Lino database for details.
Run pull.sh to update the source code:
```
$ pull.sh
```
Run the install command to install any new Python dependencies if needed:
```
$ python manage.py install
```
Run the collectstatic command:
```
$ python manage.py collectstatic
```
This step can be skipped if there were no changes in the static files.
Restore the snapshot:
```
$ python manage.py run snapshot/restore.py
```
You can skip this if you are sure that there is no change in the database structure.

You can run restore.py also "just in case", it doesn't do any harm when there were no changes in the database structure.

Running restore.py just in case does no harm, but it can take much time for a bigger database. After all this command drops all database tables, re-creates them, and then fills every single data row into it. So instead of running restore.py "just in case" you might prefer check whether you need to run it:
```
$ python manage.py dump2py -o t
$ diff snapshot/restore.py t/restore.py
```
That is, you make a second temporary snapshot (which takes much less time than restoring it) and then compare their restore.py files. If nothing has changed (i.e. diff gives no output), then you don't need to run the restore.py.

In case the restore.py gives error messages, you need to ask support from the application developer because it's their job to specify the details of what happens during the data migration by providing migrators (as documented in Data migrations à la Lino).

Start the web server and supervisor:

$ sudo service apache2 start
$ sudo service supervisor start

Shell scripts generated by getlino¶

make_snapshot.sh¶

Make a snapshot of the site's database.

Usage: See Making a snapshot of a Lino database.

Template: https://github.com/lino-framework/getlino/blob/master/getlino/templates/make_snapshot.sh

pull.sh¶

Update the Python packages used by this virtualenv.

This includes both the packages installed from cloned source code repositories and those installed via PyPI.

Template: https://github.com/lino-framework/getlino/blob/master/getlino/templates/pull.sh