[Bug 224017] security/py-certbot: "Another instance of Certbot is already running."

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224017

            Bug ID: 224017
           Summary: security/py-certbot: "Another instance of Certbot is
                    already running."
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: koobs at FreeBSD.org
          Reporter: gerard_seibert at outlook.com
          Assignee: koobs at FreeBSD.org
             Flags: maintainer-feedback?(koobs at FreeBSD.org)

~ $ uname -a
FreeBSD scorpio.seibercom.net 11.1-RELEASE-p4 FreeBSD 11.1-RELEASE-p4 #0: Tue
Nov 14 06:12:40 UTC 2017    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

~ $ freebsd-version
11.1-RELEASE-p5

dovecot-2.2.33.2_2

py27-certbot-0.19.0,1

I have been using the p5-certbot port without a problem until recently. It is
being run via cron:  /usr/local/bin/certbot -q renew --pre-hook "service
dovecot stop" --post-hook "service dovecot start". Until recently that worked
fine. Now I have started receiving this error message:  "Another instance of
Certbot is already running." Try as I might, I cannot find another instance of
"certbot" running.

Apparently, the only way to correct the problem is to reboot the system. This
only works until after the cron command has run one time, after which the
problem resurfaces.

I have confirmed that at least one other user is experiencing this problem. He
stated that the problem does not occur if the command is only run via the
command line. He believes that certbot is waiting on the post-hook command, but
only when it was ran from cron. I have not confirmed this, however.

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