[Enhancement] Add parameters for executing actions programatically from calibre-server --manage-users

[Jonas Vacek]

I would like to be able to create users for calibredb on the command line as part of an installation script, and due to the script being interactive, this hampers my flow a bit.

I've attempted to pipe the "answers" via stdin like so, but had little luck past "1"

``` bash
echo -e "1\n$user\n$password\n$password" > /tmp/calibreserverstdin.txt
calibre-server --userdb ~/.calibreconf/usrdb.sqlite --manage-users < /tmp/csuservdinput.txt
```

Having options like `--add-user $username $password`, `--change-pass $username $newpass` or `--remove-user $username` would be grand!

[Kovid Goyal (kovid)]

Should be trivial to do using the expect tool.

[Jonas Vacek (jvacek)]

I would assume so, however that is a dependency that is not available by default on most OS. This would be an extra package as well as its requirements that you'd have to install in order to do what is somewhat standard from most other tools that expose user management on the CLI.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased

[Jonas Vacek (jvacek)]

Essentially, the underlying issue is that the password does not seem to be passable via normal means to the CLI. I actually wonder now if expect would suffer from the same thing

When i run `echo -e "1\n$user\n\n$pass\n$pass" | calibre-server --userdb ~/.calibreconf/usrdb.sqlite --manage-users` I get stuck at the password prompt. The extra line-break after the user seems to not do much to the script.

```
1) Add a new user
2) Edit an existing user
3) Remove a user
4) Cancel

What do you want to do? [1-4]: Enter the username: Enter the new password for test:
Re-enter the new password for test, to verify:
User test added successfully!
```

[Jonas Vacek (jvacek)]

Ah, I didn't see the message before posting. Thanks a ton for the lightning fast turnaround!