Attachment 2098 Details for Bug 4037 – Script for a backup scenario that tickles the bug

Script for a backup scenario that tickles the bug

bkd-run.sh (text/plain), 1.36 KB, created by Matt McCutchen on 2006-08-20 17:25:51 UTC

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Creator: Matt McCutchen

Created: 2006-08-20 17:25:51 UTC

Size: 1.36 KB

patch

obsolete

>#!/bin/bash
>set -e
>R=~/tmp/bkd
>rm -rf $R
>mkdir -p $R
>
># In my home directory, I keep a copy of the original rsync source code.
>mkdir -p $R/home/matt/rsync
>echo "rsync" >$R/home/matt/rsync/rsync.c
>
># Soon I plan to make some changes to rsync, and I want $R/home/matt/rsync-test
># to always contain my latest testing version.  But for now, I'm just going to
># make rsync-test a link to plain rsync.  For some reason, I use an absolute
># symlink.
>ln -s $R/home/matt/rsync $R/home/matt/rsync-test
>
># The system is backed up.
>rsync -a --exclude="/backup*" $R/ $R/backup1/
>
># Now I'm ready to make my changes, so I replace the symlink with an actual
># copy of the rsync source code.
>rm $R/home/matt/rsync-test
>rsync -a $R/home/matt/rsync/ $R/home/matt/rsync-test/
>
># The system is backed up again.  The admin uses --link-dest to save space.
>rsync -a --exclude="/backup*" --link-dest="$R/backup1/" $R/ $R/backup2/
>
># Rsync incorrectly followed the symlink $R/backup1/home/matt/rsync-test
># => $R/home/matt/rsync in the link-dest dir.  As a result,
># $R/backup2/home/matt/rsync-test/rsync.c is a hard link to $R/home/matt/rsync/rsync.c .
># But for the moment, the backup is still OK.
>cat $R/backup2/home/matt/rsync-test/rsync.c
>
># Now I start making my changes.
>echo "rsync with changes" >$R/home/matt/rsync/rsync.c
>
># Uh-oh!  Look what happened to the backup!
>cat $R/backup2/home/matt/rsync-test/rsync.c

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