[PATCH] Unbreak makefs -M

r258695 introduces a sanity check for makefs in order to verify that
minimum image size specified is always less than maximum image size.

If makefs(1) is invoked specifying minimum image size, but not maximum
one, the program exits with an error. Example:

# sudo -E makefs -M 538968064 -B be /home/davide/disk.img $DESTDIR
makefs: `/home/davide/tftproot/mips' minsize of 538968064 rounded up
to ffs bsize of 8192 exceeds maxsize 0.  Lower bsize, or round the
minimum and maximum sizes to bsize.

I guess it's meaningful to assert that minsize < maxsize iff maxsize
is actually specified. The following patch tries to fix the problem.
Visual inspection of code also shows that maxsize == 0 is treated as
maxsize not specified. I'm not by any means familiar with makefs(1)
code, so I may miss something here.

% git diff
diff --git a/usr.sbin/makefs/ffs.c b/usr.sbin/makefs/ffs.c
index 92d5508..83e9eae 100644
--- a/usr.sbin/makefs/ffs.c
+++ b/usr.sbin/makefs/ffs.c
_at__at_ -361,7 +361,8 _at__at_ ffs_validate(const char *dir, fsnode *root,
fsinfo_t *fsopts)
        if (ffs_opts->avgfpdir == -1)
                ffs_opts->avgfpdir = AFPDIR;

-       if (roundup(fsopts->minsize, ffs_opts->bsize) > fsopts->maxsize)
+       if (fsopts->maxsize > 0
+           && roundup(fsopts->minsize, ffs_opts->bsize) > fsopts->maxsize)
                errx(1, "`%s' minsize of %lld rounded up to ffs bsize of %d "
                    "exceeds maxsize %lld.  Lower bsize, or round the minimum "
                    "and maximum sizes to bsize.", dir,

-- 
Davide

"There are no solved problems; there are only problems that are more
or less solved" -- Henri Poincare