80 lines
2.1 KiB
HTML
80 lines
2.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
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<TITLE>Linux Swap Space Mini-HOWTO: The swapinit.sh script </TITLE>
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<LINK HREF="Swap-Space-10.html" REL=next>
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<LINK HREF="Swap-Space-8.html" REL=previous>
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<LINK HREF="Swap-Space.html#toc9" REL=contents>
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</HEAD>
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<BODY>
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<A HREF="Swap-Space-10.html">Next</A>
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<A HREF="Swap-Space-8.html">Previous</A>
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<A HREF="Swap-Space.html#toc9">Contents</A>
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<HR>
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<H2><A NAME="swapinit"></A> <A NAME="s9">9. The swapinit.sh script </A></H2>
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<P>
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This shell script initializes the swap space on the partition. The code for
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signature detection has been repeated 6 times because many a times the
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signature is properly detected only on the second or the third try.
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<P>(Adapted from the original Swap-Space-HOWTO by H. Peter Anvin)
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<BLOCKQUOTE><CODE>
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<PRE>
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#!/bin/sh
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#
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# swapinit.sh - activate the swap partition
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#
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# written by Rahul U. Joshi
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# Verify and initialize swap space
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#
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echo -n 'Verifying swap space... '
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loopcount=0
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# flag to indicate whether the partition has been activated or not
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activated=0
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# check for signatures 6 times before giving up
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while [ $loopcount -lt 6 ]
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do
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if [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=10 skip=4086`" = 'SWAP-SPACE' ]; then
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echo "Linux signature found, iteration $loopcount"
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echo "Activating swap partitions"
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swapon /dev/winswap
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activated=1
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break
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elif [ "`/bin/dd 2>/dev/null if=/dev/winswap bs=1 count=11 skip=43`" = 'SWAP SPACE ' ]; then
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echo "DOS signature found, iteration $loopcount"
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echo "Making swap partition"
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mkswap /dev/winswap YYYYY
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echo "Activating swap partitions"
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swapon /dev/winswap
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activated=1
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break
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else
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let loopcount=loopcount+1
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fi
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done
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if [ $activated -ne 1 ] ; then
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echo "Swap signature not found after $loopcount tries"
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echo "No swapping partitions activated"
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exit 1
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fi
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</PRE>
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</CODE></BLOCKQUOTE>
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<HR>
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<A HREF="Swap-Space-10.html">Next</A>
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<A HREF="Swap-Space.html#toc9">Contents</A>
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</BODY>
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</HTML>
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