/usr/bin/aubrsync is in aufs-tools 1:4.9+20170918-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Copyright (C) 2005-2015 Junjiro R. Okajima
#
# This program, aufs is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The development of this script is sponcered by ASUSTek Computer Inc.
# Kindly they agreed that I keep my aufs work as free software as it has
# been.
#
set -eu
#set -x
me=$(basename $0)
EEcho() # str
{
echo ${me}: $@ 1>&2
}
f=/sbin/mount.aufs
test ! -x $f && EEcho $f is not installed && exit 1
# special handling for backward compatibility.
#
# aufs in the donated eeepc is aufs1 20080211 without CONFIG_AUFS_COMPAT.
# /etc/default/aufs was introduced in aufs1 20080922.
# shwh/noshwh was introduced in aufs1 20080310 with CONFIG_AUFS_SHWH.
# noshwh became always available regardless CONFIG_AUFS_SHWH in aufs1 20081117.
noshwh=1
AUFS_VERSION=20080211
f=/etc/default/aufs
if [ -s $f ]
then
. $f
else
echo ${me}: warning, broken $f, assuming aufs is $AUFS_VERSION
f=/usr/lib/aufs.shlib
test ! -s $f && EEcho $f is not installed && exit 1
. $f
case $AUFS_VERSION in
200*) # aufs1
test $AUFS_VERSION -lt 20081117 && noshwh=0
;;
esac
AUFS_SUPER_MAGIC=1635083891
AUFS_SUPER_MAGIC_HEX=0x61756673
AUFS_WH_PFX=.wh.
AUFS_WH_PFX2=.wh..wh.
AUFS_WH_DIROPQ=.wh..wh..opq
fi
########################################
_Rsync="rsync --exclude=lost+found"
Rsync="$_Rsync -aHSx --devices --specials --delete-before"
Copy="$Rsync"
Move="$Copy"
RsyncWh="$_Rsync -ptgoHx"
FindForRm() # rw
{
echo "find \"$1\" -xdev -depth \(
\( ! -type d
\( -name $AUFS_WH_DIROPQ
-o ! -name ${AUFS_WH_PFX2}\* \) \)
-o \( -type d
! -name ${AUFS_WH_PFX2}\*
! -wholename \"$1\"
! -wholename \"$1/lost+found\" \)
\) -print0"
}
MoveWh() # rw ro+wh
{
cd "$1"
find . -xdev -name ${AUFS_WH_PFX}\* ! -name ${AUFS_WH_PFX2}\* \
-printf '%P\n' |
while read wh
do
f=$(echo "$wh" | sed -e '
s/^'${AUFS_WH_PFX}'//
t
s:/'${AUFS_WH_PFX}':/:
')
test -e "$dst/$f" || echo "$wh"
done |
# -v
$RsyncWh --files-from=- ./ "$2"
cd "$OLDPWD"
}
copy()
{
$Copy $@ "$mntpnt"/ "$dst"
}
_move()
{
set +x
test $hinotify -ne 1 && echo ${me}: warning, -i is not specified
src_is_nfs=0
test "$(stat -f -c %T "$src")" = "nfs" && src_is_nfs=1
set $quiet
$Move $@ &&
eval $(FindForRm "$src") |
{
if [ $src_is_nfs -eq 1 ]
then
mount -o remount "$mntpnt"
# remount for NFSv4 is unreliable
mount -o remount "$src" || :
fi
xargs -r0 rm -fr #-v
}
}
move()
{
_move $@ "$mntpnt"/ "$dst"
}
move_with_wh()
{
{
set +x
MoveWh "$src" "$dst"
set $quiet
} &&
move --exclude=${AUFS_WH_PFX}\*
}
# backward compatibility
move_w()
{
move_with_wh $@
}
Usage()
{
t=$(FindForRm src_branch | sed -e '
s/"//g
$b
s/$/ \\/')
cat <<- EOF
$me Options move | move_with_wh | copy \\
mntpnt src_branch dst_branch [ options for rsync ]
generic form:
$me [ -w | --wh ] [ -i | --inotify ] Options \\
mntpnt cmd [ parameters for cmd ]
Options:
[ -n | --dry_run ]
[ -q | --quiet ]
The dst_branch must be mounted as writable.
During the operation, the mntpnt is set readonly.
If you are opening a file for writing on the writable branch,
you need to close the file before invoking this script.
The -w or --wh option requires CONFIG_AUFS_SHWH enabled.
The -i or --inotify option requires CONFIG_AUFS_HINOTIFY enabled.
'copy' is a shortcut for
$me mntpnt \\
$Copy mntpnt/ dst_branch
'move' is a shortcut for
$me mntpnt \\
"$Move \\
mntpnt/ dst_branch && \\
$t |\\
xargs -r0 rm -fr"
Note: in most cases, you will need '-i' option, and
find(1) is invoked by $me only when rsync(1)
succeded.
'move_with_wh' is a simple variation of 'move' which moves
whiteouts separately before the actual 'move'.
If you execute this script under linux-2.6.24 or earlier, the
kernel may produce a harmless warning "inotify.c:NNN
set_dentry_child_flags()". The message was already removed in
linux-2.6.25.
examples:
- Copy and reflect all the modification (modifed files, newly
created and removed ones) in the upper branch to the lower
branch. This operation is for aufs which has only 2 branches,
and mainly for a system shutdown script.
All files on the upper branch remain.
$ sudo $me copy /your/aufs /your/upper_branch /your/lower_branch
- Like above (2 branches), move and reflect all modifications
from upper to lower. Almost all files on the upper branch will
be removed. You can still use this aufs after the
operation. But the inode number may be changed. If your
application which depends upon the inode number was running at
that time, it may not work correctly.
$ sudo $me move /your/aufs /your/upper_branch /your/lower_branch
EOF
# - Like above (2 branches), generate a new middle layer like a
# snapshot including whiteouts and make the upper_branch almost
# empty, but untouch the lower_branch.
#
# $ img=/hda1/a.ext2
# $ dd if=/dev/zero of=\$img bs=4k count=1k
# $ mkfs -t ext2 -F \$img
# $ sudo mount -o rw,loop \$img /your/new_branch
# $ sudo mount -o remount,ins:1:/your/new_branch=ro+wh /your/aufs
# $ sudo $me _move /your/aufs /your/upper_branch /your/lower_branch \\
# "--remove-source-files \\
# --exclude=$AUFS_WH_BASE \\
# --exclude=$AUFS_WH_PLINKDIR \\
# --exclude=$AUFS_WH_TMPDIR \\
# /your/upper_branch/ /your/new_branch; \\
# mount -o remount,ro /your/new_branch"
# EOF
}
########################################
wh=0
hinotify=0
quiet=-x
dry_run=
cmd=
cmd_opts=
for i
do
case $i in
-w|--wh) wh=1;;
-i|--inotify) hinotify=1;;
-n|--dry_run) dry_run=echo;;
-q|--quiet) quiet=+x;;
-h|--help) Usage; exit 0;;
--) shift; break;;
*) break;;
esac
shift
done
test $# -lt 2 && Usage 1>&2 && exit 1
case "$1" in
_move|move|copy|move_w|move_with_wh)
test $# -lt 4 && Usage 1>&2 && exit 1
cmd=$1
SetDir mntpnt "$2"
SetDir src "$3"
SetDir dst "$4"
shift 4
wh=0
;;
*)
SetDir mntpnt "$1"
cmd="$2"
shift 2
;;
esac
cmd_opts="$@"
case $(stat -f -c %T "$mntpnt") in
aufs|UNKNOWN*${AUFS_SUPER_MAGIC_HEX}*) ;;
*)
EEcho "$mntpnt" is not aufs
exit 1
;;
esac
cur_opts=$(MntOpts "$mntpnt")
test ! "$cur_opts" &&
EEcho bad /proc/mounts or "$mntpnt" is not mounted &&
exit 1
cur_opts="udba=reval,noshwh,$cur_opts"
test $noshwh -eq 0 && cur_opts=$(echo $cur_opts | sed -e 's/,noshwh//')
# force flushing the pusedo-links
tmp_opts="remount,ro,udba=reval,noshwh"
test $noshwh -eq 0 && tmp_opts=$(echo $tmp_opts | sed -e 's/,noshwh//')
test $wh -eq 1 && tmp_opts="$tmp_opts,shwh"
test $hinotify -eq 1 && tmp_opts="$tmp_opts,udba=inotify"
# here we go
trap "$dry_run mount -o remount,$cur_opts \"$mntpnt\"" EXIT
set $quiet
$dry_run mount -o $tmp_opts "$mntpnt"
eval "$dry_run $cmd $cmd_opts"
|