Date: Thu, 8 Nov 2012 20:29:28 GMT From: Nick Hibma <nick@anywi.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/173482: [Patch] NanoBSD images should be created sparsely. Message-ID: <201211082029.qA8KTSmg063499@red.freebsd.org> Resent-Message-ID: <201211082030.qA8KU0uE067180@freefall.freebsd.org>
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>Number: 173482
>Category: misc
>Synopsis: [Patch] NanoBSD images should be created sparsely.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 08 20:30:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Nick Hibma
>Release: FreeBSD 8.3-RELEASE i386
>Organization:
AnyWi Technologies
>Environment:
System: FreeBSD bitske2.localdomain 8.3-RELEASE FreeBSD 8.3-RELEASE #0 r242660: Tue Nov 6 16:23:23 CET 2012 root@bitske2.localdomain:/usr/obj/usr/src/sys/GENERIC i386
>Description:
When an image is copied out into _.disk.image this could be done sparsely. I
use a Virtual machine to build the images, and writing them sparsely saves time
and space. This makes a huge difference when not initialising the second
partition (NANO_INIT_IMG2=0)
Note: The backing files are already created sparsely (using 'seek=<size>
count=0' arguments to dd).
The diff below contains also a comment on how to speed up installing packages
(using a null mount instead of copying the packages across). We install several
MBs of packages and this speeds things up dramatically.
A similar piece of code works beautifully in our package install (which
cherry-picks the packages that need to be installed instead of installing the
packages wholesale).
>How-To-Repeat:
>Fix:
--- 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 $NANO_INIT_IMG2 -gt 0 ] ; then
# Duplicate to second image (if present)
echo "Duplicating to second image..."
- dd conv=sparse if=/dev/${MD}s1 of=/dev/${MD}s2 bs=64k
+ dd if=/dev/${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 ${do_copyout_partition} ; then
echo "Writing out _.disk.image..."
- dd conv=sparse if=/dev/${MD}s1 of=${NANO_DISKIMGDIR}/_.disk.image bs=64k
+ dd if=/dev/${MD}s1 of=${NANO_DISKIMGDIR}/_.disk.image bs=64k
fi
mdconfig -d -u $MD
@@ -683,16 +683,6 @@
# Install packages from ${NANO_PACKAGE_DIR}
cust_pkg () (
- # XXX This should be replaced by a nullfs mount, like so
- # mkdir -p ${NANO_WORLDDIR}/Pkg
- # trap "umount ${NANO_PACKAGE_DIR}Pkg" 1 2 3 15 EXIT
- # mount -t nullfs ${NANO_PACKAGE_DIR}Pkg ${NANO_WORLDDIR}/Pkg
- # and replace the rm -rf below with the following:
- # umount $NANO_WORLDDIR$PKG_PATH
- # rmdir $NANO_WORLDDIR$PKG_PATH
- # trap - 1 2 3 15 EXIT
- # Missing is the handling of selecting the packages to install. The
- # loop below needs to be rewritten.
# If the package directory doesn't exist, we're done.
if [ ! -d ${NANO_PACKAGE_DIR} ]; then
>Release-Note:
>Audit-Trail:
>Unformatted:
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