On 0309T2136, David Bright wrote:
> On Mar 9, 2018, at 17:31, Ian Lepore <i...@freebsd.org> wrote:
> > 
> > On Fri, 2018-03-09 at 17:09 -0500, Mark Johnston wrote:
> >> 
> >> etc/rc.d/fsck doesn't know how to interpret the new exit code and now
> >> just drops to a single-user shell when it is encountered. […]
> >> 
> >> Is there any reason etc/rc.d/fsck shouldn't automatically retry (up to
> This is, in fact, the reason that I made the change I did. I was trying to 
> put in a retry loop to rc.d/fsck, but found that I couldn’t get it to work 
> because fsck and fsck_ffs were not exiting with non-zero status. The drop to 
> single user is not really due to the specific (new) error code of 16, it is 
> due to the fact that fsck_ffs is now exiting with a non-zero status when it 
> hasn’t completely cleaned the file system; /any/ non-zero status would cause 
> the current rc.d/fsck script to go to single user. Prior to my change, 
> fsck_ffs was exiting with a zero status even though it had not completely 
> cleaned the filesystem and told the user to run it again.
> > 
> > fsck_ffs already has a -R flag to automatically retry, wouldn't that be
> > a better mechanism for handling this new type of retry?
> That’s true; however, there is currently no way to pass that flag through the 
> filesystem-agnostic fsck wrapper called from rc.d/fsck to the 
> filesystem-specific fsck_ffs program that it calls. One could implement a 
> similar flag on the fsck wrapper to be passed along to the 
> filesystem-specific checker, but I think fsck_ffs is the only one that 
> currently implements such a flag. 

Sure there is.  See /etc/defaults/rc.conf:

fsck_y_flags="-T ffs:-R -T ufs:-R"      # Additional flags for fsck -y

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