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#!/bin/sh

# Copyright (C) 2005, 2006, 2007 Junjiro 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

# $Id: unionctl,v 1.16 2007/02/05 01:44:49 sfjro Exp $

# simple script for controling aufs.

# compatible with unionctl(8) in unionfs(5).

# if you use "mount -o remount" to add/del/mod branches,

# this scirpt is unnecessary.

PATH=/usr/bin:/usr/sbin:/bin:/sbin

export PATH

eecho() { echo "$@" 1>&2; }

me=`basename $0`

err=0

usage()

{

	eecho "${me}: $@"

	eecho usage:

	eecho "${me}" union_dir --add \

		'[ --before | --after bindex | branch ]' '[ --mode perm ]' branch

	eecho "${me}" union_dir --remove branch

	eecho "${me}" union_dir --mode branch perm

	eecho "${me}" union_dir --list

	eecho "${me}" union_dir '--whereis | --query1 | --q1' path_under_union '[ ,,, ]'

	err=1

}

conv() # [escape]

{

	sed -r -e '

	s/\\/\\134/g

	s/$/\\012/

	' |

	tr -d '\n' |

	sed -r -e '

	s/ /\\040/g

	s/\t/\\011/g

	s/\r/\\015/g

	s/\\012$//

	' |

	{ test "$1" = "escape" && sed -r -e 's/\\/\\\\/g' || cat; }

	echo

}

tgt=

branches()

{

	echo "$tgt" |

	tr ',' '\n' |

	egrep '^(dirs|br)[=:]' |

	sed -r -e 's/^(dirs|br)[=:]//' |

	tr ':=' '\n '

}

########################################

test $# -lt 2 && eecho "${me}: bad arg $@" && exit 1

f=/proc/mounts

test ! -f $f && eecho "${me}: $f is necessary" && exit 1

set -e

#set -x; echo $@

tmp=/tmp/$$

cd "$1"

mntpnt="$PWD"

e_mntpnt=`echo "$mntpnt" | conv escape`

cd "$OLDPWD"

action="$2"

shift 2

tgt=`grep "aufs $e_mntpnt" $f | tail -1 | rev | cut -f3- -d' ' | rev`

test "$tgt" = "" && eecho "${me}: no such mntpnt $mntpnt" && exit 1

dev=`echo "$tgt" | sed -e 's: '"$mntpnt aufs"' .*$::`

branches > $tmp

#cat $tmp | while read i; do echo $i; done; exit

find_bindex() # dir

{

	echo "$1" | grep -q '^[0-9]*$' && echo "$1" && return 0

	local i n err

	n=0

	cat $tmp | rev | cut -f2- -d' ' | rev |

	while read i

	do

		test "$i" = "$1" && echo $n && return 0

		n=`expr $n + 1`

	done

	err=$?

	test $err -eq 0 && return 0

	rm -f $tmp

	eecho "${me}: no such branch $1"

	echo -2

	return 1

}

Remount() #options...

{

	rm -f $tmp

	local mount212p=0

	{ mount --version 2> /dev/null || :; } | fgrep -q mount-2.12p && mount212p=1

	test $mount212p -eq 1 && exec mount -o remount,"$@" "$mntpnt"

	exec mount -o remount,"$@" "$dev" "$mntpnt"

}

do_add()

{

	local bindex perm br

	bindex=0

	perm=rw # unionfs default

	br=

	while [ "$br" = "" ]

	do

		case "$1" in

		--before)	bindex=`find_bindex "$2"`

				bindex=`expr $bindex - 1` || :

				;;

		--after)	bindex=`find_bindex "$2"`

				bindex=`expr $bindex + 1` || :

				;;

		--mode)		perm="$2";;

		--*)		eecho "${me}: unkown option $1"; return 1;;

		*)		br="$1"

		esac

		test "$br" = "" && shift 2 || :

	done

	test $# -ne 1 && eecho "${me}: bad arg $@" && return 1

	br="$1"

	test $bindex -lt 0 && bindex=0 || :

	Remount add:${bindex}:"${br}"="$perm"

}

do_del()

{

	test $# -ne 1 && eecho "${me}: bad arg $@" && return 1

	Remount del:"$1"

}

do_mod()

{

	test $# -ne 2 && eecho "${me}: bad arg $@" && return 1

	Remount mod:"$1"="$2"

}

do_list()

{

	local path mode

	cat $tmp | rev |

	while read mode path

	do

		mode=`echo $mode | rev`

		path=`echo "$path" | rev`

		case $mode in

		ro)	mode="r--";;

		rw)	mode="rw-";;

		ro+wh)	mode="R--";;

		*)	mode="---";;

		esac

		/bin/echo -e \\t"$path" \(${mode}\)

	done

}

do_query1()

{

	local path i f

	cat $tmp | rev | cut -f2- -d' ' | rev |

	while read path

	do

		for i

		do

			i=`echo "$i" | sed -e 's:^/::'`

			test -e "$mntpnt/$i" || continue

			f="$path/$i"

			test -e "$f" && if [ $# -eq 1 ]

			then echo "$path"

			else echo "$f"

			fi || :

		done

	done

}

case "$action" in

--add)		do_add "$@";;

--remove)	do_del "$@";;

--mode)		do_mod "$@";;

--list)		do_list;;

--q1|--query1|--whereis)

		do_query1 "$@";;

--query)	usage "unsupported action $action"; err=1;;

*)		usage "unkown action $action"; err=1;;

esac

rm -f $tmp $tmp.*

exit $err