Cron does not work until re-edit crontab contents

[dobryakov]

Hello.
I setup crontab inside container in Dockerfile by this way:

RUN cat /home/app/crontab.txt | crontab -u app -

I see my cron tasks inside container by run crontab -u app -l successfully.

But cron does not work until I run crontab -u app -e manually, change nothing, and save it again. After this inexplicable manipulation my crontasks begin to work successfully.

Why? I have my brain broken trying to understand. What's wrong? Please help.

Image version 0.9.22

[dobryakov]

sv restart cron does not help. Only manual re-edit helps.

[dobryakov]

The file crontab.txt has correct linux line endings (LF).

[dobryakov]

Applied workaroud

# Dockerfile
RUN echo "#!/bin/bash\ntouch /etc/crontab /etc/cron.d/* /var/spool/cron/crontabs/*" >> /etc/my_init.d/touch-crond && chmod 744 /etc/my_init.d/touch-crond

[mech]

I physically "docker exec" into the container and installed a cron jobs under "app" user, but it does not seems to work. Wondering if you have come to a conclusion?