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From: Nick Hibma <nick@van-laarhoven.org>
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Subject: NanoBSD: Create image sparsely
Date: Thu, 29 Nov 2012 08:42:23 +0100
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In the past I have submitted patches to create images sparsely. There is =
however one patch missing still which, with the addition of =
NANO_INIT_IMG2, has become much more useful:

--- AnyWi/freebsd/nanobsd/nanobsd.sh     2012-11-08 19:48:40.000000000 =
+0100
+++ /usr/src/tools/tools/nanobsd/nanobsd.sh 2012-11-06 =
15:24:52.000000000 +0100
@@ -540,7 +540,7 @@
        if [ $NANO_IMAGES -gt 1 -a $NANO_INIT_IMG2 -gt 0 ] ; then
              # Duplicate to second image (if present)
               echo "Duplicating to second image..."
-         dd if=3D/dev/${MD}s1 of=3D/dev/${MD}s2 bs=3D64k
+               dd conv=3Dsparse if=3D/dev/${MD}s1 of=3D/dev/${MD}s2 =
bs=3D64k
              mount /dev/${MD}s2a ${MNT}
             for f in ${MNT}/etc/fstab ${MNT}/conf/base/etc/fstab
           do
@@ -569,7 +569,7 @@
=20
       if ${do_copyout_partition} ; then
              echo "Writing out _.disk.image..."
-              dd if=3D/dev/${MD}s1 of=3D${NANO_DISKIMGDIR}/_.disk.image =
bs=3D64k
+          dd conv=3Dsparse if=3D/dev/${MD}s1 =
of=3D${NANO_DISKIMGDIR}/_.disk.image bs=3D64k
   fi
     mdconfig -d -u $MD
=20
It copies out the image sparsely (conv=3Dsparse). The big advantage =
comes when creating many images (I have between 10 and 20 images =
simultaneously on my disk).

Any objections to this? (*)

Nick Hibma
nick@van-laarhoven.org