exec_poststart

[markham breitbach]

I am trying to figure out how to get a script to figure out the hostname
of the jail that is starting without having to manual set that as a
command line parameter (as illustrated).  It seems that the script is
getting executed in a clean environment, regardless of the exec.clean
setting.  Is this a bug?  The man pages aren't particularly clear on the
expected behaviour of this.  I am running FreeBSD 10.2.

I would like to be able to set exec.poststart as a global default so it
doesn't need to be defined per jail.

Thanks,
-Markham

####################JAIL.CONF#########################
exec.clean = 0 ;

# HOW TO PASS THE JAILNAME TO THIS SCRIPT?
exec.poststart += "/path/to/script.sh";

# My test jail
testjail_example_com {
    # THIS WORKS
    exec.poststart += "/path/to/script.sh testjail.example.com";
    exec.clean = 0 ;
    host.hostname = "testjail.example.com";
    path = "/usr/jails/testjail.example.com";
    ip4.addr += "net0|192.0.2.1/24";
    exec.system_user = "root";
    exec.jail_user = "root";
    exec.start += "/bin/sh /etc/rc";
    exec.stop = "";
    exec.consolelog = "/var/log/jail_testjail_example_com_console.log";
    mount.fstab = "/etc/testjail_example_com";
    mount.devfs;
    devfs_ruleset = "5";
    mount.fdescfs;
    mount.procfs;
    allow.mount;
    allow.set_hostname = 0;
    allow.sysvipc = 0;
    allow.raw_sockets=1;
}