system/zerofree: Removed (added to Slackware).
Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>
This commit is contained in:
Matteo Bernardini
Robby Workman
parent
dec5056e05
commit
5f0d977fa3
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Zerofree is a utility which scans the free blocks in an ext2/3/4
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filesystem and fills any non-zero blocks with zeroes.
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This is useful if you have an ext2/3/4 virtual disk image
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(e.g. VirtualBox' .vdi) that you wish to compact.
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See project homepage for information and usage.
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@ -1,19 +0,0 @@
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# HOW TO EDIT THIS FILE:
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# The "handy ruler" below makes it easier to edit a package description.
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# Line up the first '|' above the ':' following the base package name, and
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# the '|' on the right side marks the last column you can put a character in.
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# You must make exactly 11 lines for the formatting to be correct. It's also
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# customary to leave one space after the ':' except on otherwise blank lines.
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|-----handy-ruler------------------------------------------------------|
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zerofree: zerofree (fills free blocks in an ext2/3/4 filesystem with zeroes)
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zerofree:
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zerofree: Zerofree is a utility which scans the free blocks in an ext2/3/4
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zerofree: filesystem and fills any non-zero blocks with zeroes.
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zerofree: This is useful if you have an ext2/3/4 virtual disk image
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zerofree: (e.g. VirtualBox' .vdi) that you wish to compact.
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zerofree: See project homepage for information and usage.
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zerofree:
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zerofree:
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zerofree: Homepage: http://intgat.tigress.co.uk/rmy/uml/index.html
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zerofree:
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.TH "ZEROFREE" "8"
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.SH "NAME"
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zerofree \(em zero free blocks from ext2, ext3 and ext4 file-systems
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.SH "SYNOPSIS"
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.PP
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\fBzerofree\fR [\fB-n\fP] [\fB-v\fP] [\fB-f fillval\fP] \fIfilesystem\fR
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.SH "DESCRIPTION"
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.PP
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\fBzerofree\fR finds the unallocated,
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blocks with non-zero value content in an ext2, ext3 or ext4
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\fIfilesystem\fR (e.g. /dev/hda1) and
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fills them with zeroes (or another octet of your choice).
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.PP
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Filling unused areas with zeroes is useful if the device on
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which this file-system resides is a disk image. In this case,
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depending on the type of disk image, a secondary utility may be
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able to reduce the size of the disk image after zerofree has
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been run.
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.PP
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Filling unused areas may also be useful with solid-state
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drives (SSDs). On some SSDs, filling blocks with ones (0xFF)
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is reported to trigger Flash block erasure by the firmware,
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possibly giving a write performance increase.
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.PP
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The usual way to achieve the same result (zeroing the
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unallocated blocks) is to run \fBdd\fR (1) to
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create a file full of zeroes that takes up the entire free
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space on the drive, and then delete this file. This has many
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disadvantages, which zerofree alleviates:
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.IP " \(bu" 6
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it is slow;
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.IP " \(bu" 6
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it makes the disk image (temporarily) grow to its maximal
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extent;
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.IP " \(bu" 6
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it (temporarily) uses all free space on the disk, so other
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concurrent write actions may fail.
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.PP
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\fIfilesystem\fR has to be unmounted or
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mounted read-only for \fBzerofree\fR to work. It
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will exit with an error message if the
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\fIfilesystem\fR is mounted writable. To
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remount the root file-system readonly, you can first switch to
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single user runlevel (\fBtelinit 1\fR) then use
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\fBmount \-o remount,ro
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\fIfilesystem\fR\fR.
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.PP
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\fBzerofree\fR has been written to be run
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from GNU/Linux systems installed as guest OSes inside a virtual
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machine. In this case, it is typically run from within the guest
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system, and a utility is then run from the host system to shrink
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disk image (\fBVBoxManage modifyhd \-\-compact\fR,
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provided with virtualbox, is able to do that for some disk image
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formats).
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.PP
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It may however be useful in other situations: for instance
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it can be used to make it more difficult to retrieve deleted
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data. Beware that securely deleting sensitive data is not in
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general an easy task and usually requires writing several times
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on the deleted blocks.
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.SH "OPTIONS"
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.IP "\fB-n\fP " 10
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Perform a dry run (do not modify the file-system);
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.IP "\fB-v\fP " 10
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Be verbose;
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.IP "\fB-f value\fP " 10
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Specify the octet value to fill empty blocks with (defaults to
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0). Argument must be within the range 0 to 255.
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.SH "SEE ALSO"
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.PP
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dd (1).
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.SH "AUTHOR"
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.PP
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This manual page was written by Thibaut Paumard <paumard@users.sourceforge.net> for
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the \fBDebian\fP system (but may be used by others). Permission is
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granted to copy, distribute and/or modify this document under
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the terms of the GNU General Public License, Version 2 or any
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later version published by the Free Software Foundation.
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.PP
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On Debian systems, the complete text of the GNU General Public
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License can be found in /usr/share/common-licenses/GPL-2.
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.\" created by instant / docbook-to-man, Mon 31 Mar 2014, 15:41
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#!/bin/sh
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# Slackware build script for zerofree
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# Copyright 2011-2013 Roberto Neri, Palermo, Italy
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# All rights reserved.
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#
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# Redistribution and use of this script, with or without modification, is
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# permitted provided that the following conditions are met:
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#
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# 1. Redistributions of this script must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# 20180612 bkw: update to 1.1.1.
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# 20170122 bkw: update to 1.1.0, fix homepage/download URLs.
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# 20160803 bkw: update to 1.0.4, BUILD=1
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# 20141021 bkw: add man page, add sparsify, bump BUILD to 2.
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PRGNAM=zerofree
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VERSION=${VERSION:-1.1.1}
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BUILD=${BUILD:-1}
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TAG=${TAG:-_SBo}
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if [ -z "$ARCH" ]; then
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case "$( uname -m )" in
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i?86) ARCH=i586 ;;
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arm*) ARCH=arm ;;
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*) ARCH=$( uname -m ) ;;
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esac
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fi
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CWD=$(pwd)
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TMP=${TMP:-/tmp/SBo}
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PKG=$TMP/package-$PRGNAM
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OUTPUT=${OUTPUT:-/tmp}
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if [ "$ARCH" = "i586" ]; then
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SLKCFLAGS="-O2 -march=i586 -mtune=i686"
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LIBDIRSUFFIX=""
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elif [ "$ARCH" = "i686" ]; then
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SLKCFLAGS="-O2 -march=i686 -mtune=i686"
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LIBDIRSUFFIX=""
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elif [ "$ARCH" = "x86_64" ]; then
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SLKCFLAGS="-O2 -fPIC"
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LIBDIRSUFFIX="64"
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else
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SLKCFLAGS="-O2"
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LIBDIRSUFFIX=""
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fi
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set -e
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rm -rf $PKG
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mkdir -p $TMP $PKG $OUTPUT
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cd $TMP
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rm -rf $PRGNAM-$VERSION
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tar xvf $CWD/$PRGNAM-$VERSION.tgz
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cd $PRGNAM-$VERSION
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chown -R root:root .
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find -L . \
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\( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
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-exec chmod 755 {} \; -o \
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\( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
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-exec chmod 644 {} \;
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# No ./configure or "make install" provided
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make CFLAGS="$SLKCFLAGS"
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strip --strip-unneeded $PRGNAM 2> /dev/null
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mkdir -p $PKG/usr/sbin
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cp -a $PRGNAM $PKG/usr/sbin
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# This looks useful, include it.
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gcc $SLKCFLAGS -Wl,-s -o $PKG/usr/sbin/sparsify $CWD/sparsify.c -lext2fs
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# man page comes from Debian.
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mkdir -p $PKG/usr/man/man8
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gzip -9c $CWD/$PRGNAM.8 > $PKG/usr/man/man8/$PRGNAM.8.gz
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mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
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cp -a COPYING $PKG/usr/doc/$PRGNAM-$VERSION
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cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
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mkdir -p $PKG/install
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cat $CWD/slack-desc > $PKG/install/slack-desc
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cd $PKG
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/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
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@ -1,12 +0,0 @@
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PRGNAM="zerofree"
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VERSION="1.1.1"
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HOMEPAGE="http://frippery.org/uml/"
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DOWNLOAD="http://frippery.org/uml/zerofree-1.1.1.tgz \
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http://frippery.org/uml/sparsify.c"
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MD5SUM="4f2d6bdba4212e54eb7dd22a8fbb6d29 \
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919ad782c7120d1e4a9c0ccc9f45b8ef"
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DOWNLOAD_x86_64=""
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MD5SUM_x86_64=""
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REQUIRES=""
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MAINTAINER="B. Watson"
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EMAIL="yalhcru@gmail.com"
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