Date: Thu, 29 Nov 2012 07:27:05 -0700 From: Warner Losh <imp@bsdimp.com> To: Nick Hibma <nick@van-laarhoven.org> Cc: =?windows-1252?Q?=93FreeBSD_Embedded_Mailing_List=94?= <freebsd-embedded@FreeBSD.org> Subject: Re: NanoBSD: Create image sparsely Message-ID: <AC27719A-28AD-4567-A9F6-69195C2C1C98@bsdimp.com> In-Reply-To: <42654855-CF29-488A-A645-2A280FC9D074@van-laarhoven.org> References: <42654855-CF29-488A-A645-2A280FC9D074@van-laarhoven.org>
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Looks good to me, go ahead.
Warner
On Nov 29, 2012, at 12:42 AM, Nick Hibma wrote:
> 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 $NANO_INIT_IMG2 -gt 0 ] ; then
> # Duplicate to second image (if present)
> echo "Duplicating to second image..."
> - dd if=/dev/${MD}s1 of=/dev/${MD}s2 bs=64k
> + dd conv=sparse if=/dev/${MD}s1 of=/dev/${MD}s2 bs=64k
> mount /dev/${MD}s2a ${MNT}
> for f in ${MNT}/etc/fstab ${MNT}/conf/base/etc/fstab
> do
> @@ -569,7 +569,7 @@
>
> if ${do_copyout_partition} ; then
> echo "Writing out _.disk.image..."
> - dd if=/dev/${MD}s1 of=${NANO_DISKIMGDIR}/_.disk.image bs=64k
> + dd conv=sparse if=/dev/${MD}s1 of=${NANO_DISKIMGDIR}/_.disk.image bs=64k
> fi
> mdconfig -d -u $MD
>
> It copies out the image sparsely (conv=sparse). 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
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