plugin init example at docker start causes duplicated cron about docker-redmine HOT 5 CLOSED

One possible solution would be to replace the proposed crontab command with:

crontab -u redmine -l 2>/dev/null | grep -v redmine:recur_tasks >/tmp/cron.redmine

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I've pointed on the same problem in #50 with the filtering solution....

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@kstange The plugin init mechanism is present mainly to allow for custom operations users may want to run when the image is started. All necessary check should be done by the user who install the plugin init script. In this case it would involve, getting the current list of cron jobs for the redmine user, grep for some pattern, install cron job is pattern is not found.

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I recognize that, my main objective is just to provide a point of feedback on your documentation, such that other people who follow it to the letter don't end up running into issues.

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@kstange yep you are right. I did not realize that line was mentioned in the docs

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