[Bug 234514] bsdinstall: Stalled after dhclient

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234514

Jason A. Harmening <jah at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jah at FreeBSD.org
           Assignee|sysinstall at FreeBSD.org      |jah at FreeBSD.org

--- Comment #1 from Jason A. Harmening <jah at FreeBSD.org> ---
It looks like this was caused by r325740 in dhclient.
netconfig_ipv4 captures dhclient's stdout using command substitution for
possible logging in case dhclient throws an error.  The expectation is that
this will terminate as soon as dhclient either fails to get a lease and
terminates, or succeeds in getting a lease and daemonizes (which closes
stdin/stdout/stderr).

The switch to cap_syslog broke this behavior, because cap_syslog specifies
CASPER_SERVICE_STDIO in its service declaration, so the spawned casper service
holds dhclient's stdio descriptors opens.

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