How set read-only permission?

[99orazio]

How can i set read-only permission to volume specified in docker file?
i don't understand how to set it in ENVIRONMENT line:
USERS=one|1234|/ftp/one| two|1234|/ftp/two

[Peanow]

You can manually add specific config file for each virtual user.
First, add a line in vsftpd.conf
user_config_dir=/etc/vsftpd/vuser.d

Then, for instance, a user named user1, add a file named user1 in/etc/vsftpd/vuser.d

Finally, edit file user1
insert "write_enable=YES"

[djbie]

How can i set read-only permission to volume specified in docker file? i don't understand how to set it in ENVIRONMENT line: USERS=one|1234|/ftp/one| two|1234|/ftp/two

-v /dir/to/local:/dir/to/docker:ro