tests for clone-dest

[Joseph Maher]

Here's a test for clone-test on bcachefs, also available here:

https://github.com/josephmaher/rsync

Notes:

         Test needs to be run as root.

         clone-dest-bcachefs needs mkfs.bcachefs


Joseph


On Wed, 14 Feb 2024, Joseph Maher via rsync wrote:

>
> WayneD's clone-dest patch seems to be working for me, it's available here:
>
> https://github.com/WayneD/rsync-patches/blob/master/clone-dest.diff
>
> I've written some very basic tests, which I've attached to this email, in 
> case they are of use to anyone else.  They're also available here:
>
> https://github.com/josephmaher/rsync
>
> Notes:
>
> 	Tests need to be run as root.
>
> 	clone-dest-btrs.test needs mkfs.btrfs (from btrfs-progs) and 
> btrs-search-metadata (from python3-btrfs).
>
> 	clone-dest-xfs.test needs mkfs.xfs and xfs_bmap (from xfsprogs).
>
>
> Joseph
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#!/bin/sh

# Copyright (C) 2024 by Joseph Maher <github at josephmaher.org>
# This program is distributable under the terms of the GNU GPL (see COPYING)
#
# Check that the --clone-dest option makes reflinks as requested

. "$suitedir/rsync.fns"

test -f /sbin/mkfs.bcachefs || test_skipped "Can't find mkfs.bcachefs (only available on Linux with bacachefs support)"

# make a btrfs filesystem and mount it
truncate -s 25M $scratchdir/bcachefs.image
/sbin/mkfs.bcachefs $scratchdir/bcachefs.image > /dev/null
mkdir -p $scratchdir/mnt/
mount -o loop $scratchdir/bcachefs.image $scratchdir/mnt/ || test_skipped "Can't mount bcachefs image file, try running as root"

# set up some test files and rsync them
mkdir $scratchdir/mnt/1 $scratchdir/mnt/2 $scratchdir/mnt/3
# files should be at least 4K in size so they fill an extent block
dd if=/dev/urandom of=$scratchdir/mnt/1/a bs=4K count=1 status=none
# sometimes the extents get cached, sync helps write them to disk
sync $scratchdir/mnt/1/a
cp --reflink=never $scratchdir/mnt/1/a $scratchdir/mnt/1/b
sync $scratchdir/mnt/1/b
cp --reflink=never $scratchdir/mnt/1/a $scratchdir/mnt/3/a
sync $scratchdir/mnt/3/a

clonedir=$(realpath $scratchdir/mnt/3)

checkit "$RSYNC -a --clone-dest='$clonedir' '$scratchdir/mnt/1/' '$scratchdir/mnt/2/'" "$scratchdir/mnt/1/" "$scratchdir/mnt/2/"
sync $scratchdir/mnt/2/a
sync $scratchdir/mnt/2/b

# check the extents are the same

get_extents() {
    #try and get the extend id from filefrag
    result=$(/usr/sbin/filefrag -v $1 | /usr/bin/sed '4!d' | /usr/bin/awk '{ print $4 }')
    if [ ! -n "$result" ]; then
        echo "couldn't find extents for " $1
    fi
    echo "$result"
}

test "$(get_extents $scratchdir/mnt/2/a)" = "$(get_extents $scratchdir/mnt/3/a)" || test_fail "clone-dest files have different extents"

# clean up
umount $scratchdir/mnt/

# The script would have aborted on error, so getting here means we've won.
exit 0