GIF89a=( �' 7IAXKgNgYvYx\%wh&h}t�h%�s%x�}9�R��&�0%� (�.��5�SD��&�a)�x5��;ͣ*ȡ&ղ)ׯ7׵<ѻ4�3�H֧KͯT��Y�aq��q��F� !� ' !� NETSCAPE2.0 , =( ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g���E�������R���E����B�� ��ȸ��D���"�Ů� �H��L��D٫D�B�����D���T���H �G��A R�ڐ |�� ٭&��E8�S�kG�A�px�a��� R2XB��E8I���6X�:vT)�~��q�賥��"F~%x� � 4#Z�0O|-4Bs�X:= Q� Sal��yXJ`GȦ|s h��K3l7�B|�$'7Jީܪ0!��D�n=�P� ����0`�R�lj����v>���5 �.69�ϸd�����nlv�9��f{���Pbx �l5}�p� ��� �3a���I�O����!ܾ���i��9��#��)p�a ޽ �{�)vm��%D~ 6f��s}Œ�D�W E�`!� �&L8x� �ܝ{)x`X/>�}m��R�*|`D�=�_ ^�5 !_&'a�O�7�c��`DCx`�¥�9�Y�F���`?��"� �n@`�} lď��@4>�d S �v�xN��"@~d��=�g�s~G��� ���ud &p8Q�)ƫlXD����A~H�ySun�j���k*D�LH�] ��C"J��Xb~ʪwSt}6K,��q�S:9ت:���l�@�`�� �.۬�t9�S�[:��=`9N����{¿�A !R�:���6��x�0�_ �;������^���#����!����U���;0L1�����p% A��U̬ݵ��%�S��!���~`�G���� ���=4�np�3���������u�u�ٮ|%2�I��r�#0��J``8�@S@5� ���^`8E�]�.�S���7 � �0�j S�D� z���i�S�����!���l��w9*�D�I�nEX��� &A�Go�Qf��F��;���}�J����F5��Q|���X��T��y���]� o ��C=��:���PB@ D׽S�(>�C�x}`��xJЬ�۠��p+eE0`�}`A �/NE�� �9@��� H�7�!%B0`�l*��!8 2�%� �:�1�0E��ux%nP1�!�C)�P81l�ɸF#Ƭ{����B0>�� �b�`��O3��()yRpb��E.ZD8�H@% �Rx+%���c� ���f��b�d�`F�"8�XH"��-�|1�6iI, 2�$+](A*j� QT�o0.�U�`�R�}`�SN����yae�����b��o~ S)�y�@��3 �tT�0�&�+~L�f"�-|�~��>!�v��~�\Q1)}@�}h#aP72�"�$ !� " , =( &7IAXG]KgNgYvYxR"k\%w]'}h}t�h%�g+�s%r.m3ax3�x�}9��&��+�!7�0%� (�.�SD��&��;�"&ײ)׻4��6�K� �@pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E �� �������E �´��C���ǶR��D��"Ʒ�ʱH��M��GڬD�B����D��T����G���C�C� l&�~:'�tU�6ɹ#��)�'�.6�&��Ȼ K(8p0N�?!�2"��NIJX>R��OM '��2�*x�>#n� �@<[:�I�f ��T���Cdb��[�}E�5MBo��@�`@��tW-3 �x�B���jI�&E�9[T&$��ﯧ&"s��ȳ����dc�UUρ#���ldj?����`\}���u|3'�R]�6 �S#�!�FKL�*N E���`$�:e�YD�q�.�촁�s \-�jA 9�����-��M[�x(�s��x�|���p��}k�T�DpE@W� ��]k`1� ���Yb ��0l��*n0��"~zBd�~u�7�0Bl��0-�x~|U�U0 �h�*HS�|��e"#"?vp�i`e6^�+q��`m8 #V�� ��VS|`��"m"сSn|@:U���~`pb�G�ED����2F�I�? >�x� R� ��%~jx��<�a�9ij�2�D��&: Z`�]w���:�6��B�7eFJ|�ҧ�,���FǮcS�ʶ+B�,�ܺN���>PAD�HD��~���n��}�#�� Q��S���2�X�{�k�lQ�2�����w�|2� h9��G�,m���3��6-��E�L��I�³*K���q�`DwV�QXS��peS��� qܧTS����R�u �<�a�*At�lmE� � ��N[P1�ۦ��$��@`��Dpy�yXvCAy�B`}D� 0QwG#� �a[^�� $���Ǧ{L�"[��K�g�;�S~��GX.�goT.��ư��x���?1z��x~:�g�|�L� ��S`��0S]P�^p F<""�?!,�!N4&P� ����:T�@h�9%t��:�-~�I<`�9p I&.)^ 40D#p@�j4�ج:�01��rܼF2oW�#Z ;$Q q  �K��Nl#29 !F@�Bh�ᏬL!XF�LHKh�.�hE&J�G��<"WN!�����Y@� >R~19J"�2,/ &.GXB%�R�9B6�W]���W�I�$��9�RE8Y� ��"�A5�Q.axB�&ة�J�! �t)K%tS-�JF b�NMxL��)�R��"���6O!TH�H� 0 !� ) , =( &AXKgNgYvYxR"k\%wh&h}h%�g+�s%r.x3�x�}9��&��+�R,�!7�0%� (�.��5��&�a)��;�"&ף*Ȳ)ׯ7׻4�3��6�H֧KͻH�T��Y��q��h� ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E$����� � ����$E$��"��D� � ������R��C��� E ��H�M��G�D� �B��ϾD��a��`1r��Ӑ�� �o~�zU!L�C'�yW�UGt����ll�0���uG�)A�s[��x� �xO%��X2�  P�n:R/��aHae+�Dm?# ǣ6�8�J�x�Di�M���j���5oQ7�- <! *�l��R2r/a!l)d� A"�E���� &� ;��c �%����b��pe~C"B���H�eF2��`8qb�t_`ur`e� w�u3��Pv�h""�`�Íx�LĹ��3� �~ֺ�:���MDfJ� �۵�W�%�S�X �؁)�@��:E��w�u�Sxb8y\m�zS��Zb�E�L��w!y(>�"w�=�|��s�d �C�W)H�cC$�L �7r.�\{)@�`@ �X�$PD `aaG:���O�72E�amn]�"Rc�x�R� &dR8`g��i�xLR!�P &d����T���i�|�_ � Qi�#�`g:��:noM� :V �)p����W&a=�e�k� j���1߲s�x�W�jal|0��B0�, \j۴:6���C ��W��|��9���zĸV {�;��n��V�m�I��.��PN� ����C��+��By�ѾHŸ:��� 7�Y�FTk�SaoaY$D�S���29R�kt� ��f� ��:��Sp�3�I��DZ� �9���g��u�*3)O��[_hv ,���Et x�BH� �[��64M@�S�M7d�l�ܶ5-��U܍��z�R3Ԭ3~ ��P��5�g: ���kN�&0�j4���#{��3S�2�K�'ợl���2K{� {۶?~m𸧠�I�nE�='����^���_�=��~�#O���'���o..�Y�n��CSO��a��K��o,���b�����{�C�� "�{�K ��w��Ozdը�:$ ���v�] A#� ���a�z)Rx׿ƥ�d``�w-�y�f�K!����|��P��=�`�(f��'Pa ��BJa%��f�%`�}F����6>��`G"�}�=�!o`�^FP�ةQ�C���`(�}\�ݮ ��$<��n@dĠE#��U�I�!� #l��9`k���'Rr��Z�NB�MF �[�+9���-�wj���8�r� ,V�h"�|�S=�G_��"E� 0i*%̲��da0mVk�):;&6p>�jK ��# �D�:�c?:R Ӭf��I-�"�<�="��7�3S��c2RW ,�8(T"P0F¡Jh�" ; 403WebShell
403Webshell
Server IP : 173.249.157.85  /  Your IP : 3.128.199.33
Web Server : Apache
System : Linux server.frogzhost.com 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64
User : econtech ( 1005)
PHP Version : 7.3.33
Disable Function : NONE
MySQL : OFF  |  cURL : OFF  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : ON  |  Pkexec : ON
Directory :  /bin/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :

[ Back ]     

Current File : /bin/dpkg-maintscript-helper
#!/bin/sh
#
# Copyright © 2007, 2011-2015 Guillem Jover <guillem@debian.org>
# Copyright © 2010 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2008 Joey Hess <joeyh@debian.org>
# Copyright © 2005 Scott James Remnant (original implementation on www.dpkg.org)
#
# This program 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, see <https://www.gnu.org/licenses/>.

# The conffile related functions are inspired by
# https://wiki.debian.org/DpkgConffileHandling

# This script is documented in dpkg-maintscript-helper(1)

##
## Functions to remove an obsolete conffile during upgrade
##
rm_conffile() {
	local CONFFILE="$1"
	local LASTVERSION="$2"
	local PACKAGE="$3"
	if [ "$LASTVERSION" = "--" ]; then
		LASTVERSION=""
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	# Skip remaining parameters up to --
	while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage "missing arguments after --"
	shift

	[ -n "$PACKAGE" ] || error "couldn't identify the package"
	[ -n "$1" ] || error "maintainer script parameters are missing"
	[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
		error "environment variable DPKG_MAINTSCRIPT_NAME is required"
	[ "${CONFFILE}" != "${CONFFILE#/}" ] || \
		error "conffile '$CONFFILE' is not an absolute path"
	validate_optional_version "$LASTVERSION"

	debug "Executing $0 rm_conffile in $DPKG_MAINTSCRIPT_NAME" \
	      "of $DPKG_MAINTSCRIPT_PACKAGE"
	debug "CONFFILE=$CONFFILE PACKAGE=$PACKAGE" \
	      "LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
	case "$DPKG_MAINTSCRIPT_NAME" in
	preinst)
		if [ "$1" = "install" -o "$1" = "upgrade" ] && [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			prepare_rm_conffile "$CONFFILE" "$PACKAGE"
		fi
		;;
	postinst)
		if [ "$1" = "configure" ] && [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			finish_rm_conffile "$CONFFILE"
		fi
		;;
	postrm)
		if [ "$1" = "purge" ]; then
			rm -f "$CONFFILE.dpkg-bak" "$CONFFILE.dpkg-remove" \
			      "$CONFFILE.dpkg-backup"
		fi
		if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
		   [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			abort_rm_conffile "$CONFFILE" "$PACKAGE"
		fi
		;;
	*)
		debug "$0 rm_conffile not required in $DPKG_MAINTSCRIPT_NAME"
		;;
	esac
}

prepare_rm_conffile() {
	local CONFFILE="$1"
	local PACKAGE="$2"

	[ -e "$CONFFILE" ] || return 0
	ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0

	local md5sum old_md5sum
	md5sum="$(md5sum "$CONFFILE" | sed -e 's/ .*//')"
	old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$PACKAGE" | \
		sed -n -e "\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
	if [ "$md5sum" != "$old_md5sum" ]; then
		mv -f "$CONFFILE" "$CONFFILE.dpkg-backup"
	else
		mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
	fi
}

finish_rm_conffile() {
	local CONFFILE="$1"

	if [ -e "$CONFFILE.dpkg-backup" ]; then
		echo "Obsolete conffile $CONFFILE has been modified by you."
		echo "Saving as $CONFFILE.dpkg-bak ..."
		mv -f "$CONFFILE.dpkg-backup" "$CONFFILE.dpkg-bak"
	fi
	if [ -e "$CONFFILE.dpkg-remove" ]; then
		echo "Removing obsolete conffile $CONFFILE ..."
		rm -f "$CONFFILE.dpkg-remove"
	fi
}

abort_rm_conffile() {
	local CONFFILE="$1"
	local PACKAGE="$2"

	ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0

	if [ -e "$CONFFILE.dpkg-remove" ]; then
		echo "Reinstalling $CONFFILE that was moved away"
		mv "$CONFFILE.dpkg-remove" "$CONFFILE"
	fi
	if [ -e "$CONFFILE.dpkg-backup" ]; then
		echo "Reinstalling $CONFFILE that was backed-up"
		mv "$CONFFILE.dpkg-backup" "$CONFFILE"
	fi
}

##
## Functions to rename a conffile during upgrade
##
mv_conffile() {
	local OLDCONFFILE="$1"
	local NEWCONFFILE="$2"
	local LASTVERSION="$3"
	local PACKAGE="$4"
	if [ "$LASTVERSION" = "--" ]; then
		LASTVERSION=""
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	# Skip remaining parameters up to --
	while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage "missing arguments after --"
	shift

	[ -n "$PACKAGE" ] || error "couldn't identify the package"
	[ -n "$1" ] || error "maintainer script parameters are missing"
	[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
		error "environment variable DPKG_MAINTSCRIPT_NAME is required"
	[ "${OLDCONFFILE}" != "${OLDCONFFILE#/}" ] || \
		error "old-conffile '$OLDCONFFILE' is not an absolute path"
	[ "${NEWCONFFILE}" != "${NEWCONFFILE#/}" ] || \
		error "new-conffile '$NEWCONFFILE' is not an absolute path"
	validate_optional_version "$LASTVERSION"

	debug "Executing $0 mv_conffile in $DPKG_MAINTSCRIPT_NAME" \
	      "of $DPKG_MAINTSCRIPT_PACKAGE"
	debug "CONFFILE=$OLDCONFFILE -> $NEWCONFFILE PACKAGE=$PACKAGE" \
	      "LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
	case "$DPKG_MAINTSCRIPT_NAME" in
	preinst)
		if [ "$1" = "install" -o "$1" = "upgrade" ] && [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			prepare_mv_conffile "$OLDCONFFILE" "$PACKAGE"
		fi
		;;
	postinst)
		if [ "$1" = "configure" ] && [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			finish_mv_conffile "$OLDCONFFILE" "$NEWCONFFILE" "$PACKAGE"
		fi
		;;
	postrm)
		if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
		   [ -n "$2" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			abort_mv_conffile "$OLDCONFFILE" "$PACKAGE"
		fi
		;;
	*)
		debug "$0 mv_conffile not required in $DPKG_MAINTSCRIPT_NAME"
		;;
	esac
}

prepare_mv_conffile() {
	local CONFFILE="$1"
	local PACKAGE="$2"

	[ -e "$CONFFILE" ] || return 0

	ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0

	local md5sum old_md5sum
	md5sum="$(md5sum "$CONFFILE" | sed -e 's/ .*//')"
	old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$PACKAGE" | \
		sed -n -e "\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
	if [ "$md5sum" = "$old_md5sum" ]; then
		mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
	fi
}

finish_mv_conffile() {
	local OLDCONFFILE="$1"
	local NEWCONFFILE="$2"
	local PACKAGE="$3"

	rm -f "$OLDCONFFILE.dpkg-remove"

	[ -e "$OLDCONFFILE" ] || return 0
	ensure_package_owns_file "$PACKAGE" "$OLDCONFFILE" || return 0

	echo "Preserving user changes to $NEWCONFFILE (renamed from $OLDCONFFILE)..."
	if [ -e "$NEWCONFFILE" ]; then
		mv -f "$NEWCONFFILE" "$NEWCONFFILE.dpkg-new"
	fi
	mv -f "$OLDCONFFILE" "$NEWCONFFILE"
}

abort_mv_conffile() {
	local CONFFILE="$1"
	local PACKAGE="$2"

	ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0

	if [ -e "$CONFFILE.dpkg-remove" ]; then
		echo "Reinstalling $CONFFILE that was moved away"
		mv "$CONFFILE.dpkg-remove" "$CONFFILE"
	fi
}

##
## Functions to replace a symlink with a directory
##
symlink_to_dir() {
	local SYMLINK="$1"
	local SYMLINK_TARGET="$2"
	local LASTVERSION="$3"
	local PACKAGE="$4"

	if [ "$LASTVERSION" = "--" ]; then
		LASTVERSION=""
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi

	# Skip remaining parameters up to --
	while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage "missing arguments after --"
	shift

	[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
		error "environment variable DPKG_MAINTSCRIPT_NAME is required"
	[ -n "$PACKAGE" ] || error "cannot identify the package"
	[ -n "$SYMLINK" ] || error "symlink parameter is missing"
	[ "${SYMLINK#/}" = "$SYMLINK" ] && \
		error "symlink pathname is not an absolute path"
	[ "${SYMLINK%/}" = "$SYMLINK" ] || \
		error "symlink pathname ends with a slash"
	[ -n "$SYMLINK_TARGET" ] || error "original symlink target is missing"
	[ -n "$1" ] || error "maintainer script parameters are missing"
	validate_optional_version "$LASTVERSION"

	debug "Executing $0 symlink_to_dir in $DPKG_MAINTSCRIPT_NAME" \
	      "of $DPKG_MAINTSCRIPT_PACKAGE"
	debug "SYMLINK=$SYMLINK -> $SYMLINK_TARGET PACKAGE=$PACKAGE" \
	      "LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"

	case "$DPKG_MAINTSCRIPT_NAME" in
	preinst)
		if [ "$1" = "install" -o "$1" = "upgrade" ] &&
		   [ -n "$2" ] && [ -h "$SYMLINK" ] &&
		   symlink_match "$SYMLINK" "$SYMLINK_TARGET" &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			mv -f "$SYMLINK" "${SYMLINK}.dpkg-backup"
		fi
		;;
	postinst)
		# We cannot bail depending on the version, as here we only
		# know what was the last configured version, and we might
		# have been unpacked, then upgraded with an unpack and thus
		# never been configured before.
		if [ "$1" = "configure" ] && [ -h "${SYMLINK}.dpkg-backup" ] &&
		   symlink_match "${SYMLINK}.dpkg-backup" "$SYMLINK_TARGET"
		then
			rm -f "${SYMLINK}.dpkg-backup"
		fi
		;;
	postrm)
		if [ "$1" = "purge" ] && [ -h "${SYMLINK}.dpkg-backup" ]; then
		    rm -f "${SYMLINK}.dpkg-backup"
		fi
		if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
		   [ -n "$2" ] &&
		   [ ! -e "$SYMLINK" ] && [ -h "${SYMLINK}.dpkg-backup" ] &&
		   symlink_match "${SYMLINK}.dpkg-backup" "$SYMLINK_TARGET" &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			echo "Restoring backup of $SYMLINK ..."
			mv "${SYMLINK}.dpkg-backup" "$SYMLINK"
		fi
		;;
	*)
		debug "$0 symlink_to_dir not required in $DPKG_MAINTSCRIPT_NAME"
		;;
	esac
}

##
## Functions to replace a directory with a symlink
##
dir_to_symlink() {
	local PATHNAME="${1%/}"
	local SYMLINK_TARGET="$2"
	local LASTVERSION="$3"
	local PACKAGE="$4"

	if [ "$LASTVERSION" = "--" ]; then
		LASTVERSION=""
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi
	if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
		PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
	fi

	# Skip remaining parameters up to --
	while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage "missing arguments after --"
	shift

	[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
		error "environment variable DPKG_MAINTSCRIPT_NAME is required"
	[ -n "$PACKAGE" ] || error "cannot identify the package"
	[ -n "$PATHNAME" ] || error "directory parameter is missing"
	[ "${PATHNAME#/}" = "$PATHNAME" ] && \
		error "directory parameter is not an absolute path"
	[ -n "$SYMLINK_TARGET" ] || error "new symlink target is missing"
	[ -n "$1" ] || error "maintainer script parameters are missing"
	validate_optional_version "$LASTVERSION"

	debug "Executing $0 dir_to_symlink in $DPKG_MAINTSCRIPT_NAME" \
	      "of $DPKG_MAINTSCRIPT_PACKAGE"
	debug "PATHNAME=$PATHNAME SYMLINK_TARGET=$SYMLINK_TARGET" \
	      "PACKAGE=$PACKAGE LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"

	case "$DPKG_MAINTSCRIPT_NAME" in
	preinst)
		if [ "$1" = "install" -o "$1" = "upgrade" ] &&
		   [ -n "$2" ] &&
		   [ ! -h "$PATHNAME" ] && [ -d "$PATHNAME" ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			prepare_dir_to_symlink "$PACKAGE" "$PATHNAME"
		fi
		;;
	postinst)
		# We cannot bail depending on the version, as here we only
		# know what was the last configured version, and we might
		# have been unpacked, then upgraded with an unpack and thus
		# never been configured before.
		if [ "$1" = "configure" ] &&
		   [ -d "${PATHNAME}.dpkg-backup" ] &&
		   [ ! -h "$PATHNAME" ] && [ -d "$PATHNAME" ] &&
		   [ -f "$PATHNAME/.dpkg-staging-dir" ]; then
			finish_dir_to_symlink "$PATHNAME" "$SYMLINK_TARGET"
		fi
		;;
	postrm)
		if [ "$1" = "purge" ] && [ -d "${PATHNAME}.dpkg-backup" ]; then
		    rm -rf "${PATHNAME}.dpkg-backup"
		fi
		if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
		   [ -n "$2" ] &&
		   [ -d "${PATHNAME}.dpkg-backup" ] &&
		   [ \( ! -h "$PATHNAME" -a -d "$PATHNAME" -a \
		        -f "$PATHNAME/.dpkg-staging-dir" \) -o \
		     \( -h "$PATHNAME" -a \
		        \( "$(readlink "$PATHNAME")" = "$SYMLINK_TARGET" -o \
		           "$(readlink -f "$PATHNAME")" = "$SYMLINK_TARGET" \) \) ] &&
		   dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
			abort_dir_to_symlink "$PATHNAME"
		fi
		;;
	*)
		debug "$0 dir_to_symlink not required in $DPKG_MAINTSCRIPT_NAME"
		;;
	esac
}

prepare_dir_to_symlink()
{
	local PACKAGE="$1"
	local PATHNAME="$2"

	local LINE
	# If there are conffiles we should not perform the switch.
	dpkg-query -W -f='${Conffiles}\n' "$PACKAGE" | while read -r LINE; do
		case "$LINE" in
		"$PATHNAME"/*)
			error "directory '$PATHNAME' contains conffiles," \
			      "cannot switch to symlink"
			;;
		esac
	done

	# If there are locally created files or files owned by another package
	# we should not perform the switch.
	export DPKG_MAINTSCRIPT_HELPER_INTERNAL_API="$version"
	find "$PATHNAME" -print0 | \
		xargs -0 -n1 $0 _internal_pkg_must_own_file "$PACKAGE" || \
		error "directory '$PATHNAME' contains files not owned by" \
		      "package $PACKAGE, cannot switch to symlink"
	unset DPKG_MAINTSCRIPT_HELPER_INTERNAL_API

	# At this point, we know that the directory either contains no files,
	# or only non-conffiles owned by the package.
	#
	# To do the switch we cannot simply replace it with the final symlink
	# just yet, because dpkg needs to remove any file present in the old
	# package that have disappeared in the new one, and we do not want to
	# lose files resolving to the same pathname in the symlink target.
	#
	# We cannot replace the directory with a staging symlink either,
	# because dpkg will update symlinks to their new target.
	#
	# So we need to create a staging directory, to avoid removing files
	# from other packages, and to trap any new files in the directory
	# to move them to their correct place later on.
	mv -f "$PATHNAME" "${PATHNAME}.dpkg-backup"
	mkdir "$PATHNAME"

	# Mark it as a staging directory, so that we can track things.
	touch "$PATHNAME/.dpkg-staging-dir"
}

finish_dir_to_symlink()
{
	local PATHNAME="$1"
	local SYMLINK_TARGET="$2"

	# Move the contents of the staging directory to the symlink target,
	# as those are all new files installed between this package being
	# unpacked and configured.
	local ABS_SYMLINK_TARGET
	if [ "${SYMLINK_TARGET#/}" = "$SYMLINK_TARGET" ]; then
		ABS_SYMLINK_TARGET="$(dirname "$PATHNAME")/$SYMLINK_TARGET"
	else
		ABS_SYMLINK_TARGET="$SYMLINK_TARGET"
	fi
	rm "$PATHNAME/.dpkg-staging-dir"
	find "$PATHNAME" -mindepth 1 -print0 | \
		xargs -0 -i% mv -f "%" "$ABS_SYMLINK_TARGET/"

	# Remove the staging directory.
	rmdir "$PATHNAME"

	# Do the actual switch.
	ln -s "$SYMLINK_TARGET" "$PATHNAME"

	# We are left behind the old files owned by this package in the backup
	# directory, just remove it.
	rm -rf "${PATHNAME}.dpkg-backup"
}

abort_dir_to_symlink()
{
	local PATHNAME="$1"

	echo "Restoring backup of $PATHNAME ..."
	if [ -h "$PATHNAME" ]; then
		rm -f "$PATHNAME"
	else
		# The staging directory must be empty, as no other package
		# should have been unpacked in between.
		rm -f "$PATHNAME/.dpkg-staging-dir"
		rmdir "$PATHNAME"
	fi

	mv "${PATHNAME}.dpkg-backup" "$PATHNAME"
}

# Common functions
validate_optional_version() {
	local VERSION="$1"

	if [ -z "$VERSION" ]; then
		return
	fi

	if ! VERSIONCHECK=$(dpkg --validate-version -- "$VERSION" 2>&1); then
		error "$VERSIONCHECK"
	fi
}

ensure_package_owns_file() {
	local PACKAGE="$1"
	local FILE="$2"

	if ! dpkg-query -L "$PACKAGE" | grep -F -q -x "$FILE"; then
		debug "File '$FILE' not owned by package " \
		      "'$PACKAGE', skipping $command"
		return 1
	fi
	return 0
}

internal_pkg_must_own_file()
{
	local PACKAGE="$1"
	local FILE="$2"

	if [ "$DPKG_MAINTSCRIPT_HELPER_INTERNAL_API" != "$version" ]; then
		error "internal API used by external command"
	fi

	if ! ensure_package_owns_file "$PACKAGE" "$FILE"; then
		error "file '$FILE' not owned by package '$PACKAGE'"
	fi
	return 0
}

symlink_match()
{
	local SYMLINK="$1"
	local SYMLINK_TARGET="$2"

	[ "$(readlink "$SYMLINK")" = "$SYMLINK_TARGET" ] || \
	[ "$(readlink -f "$SYMLINK")" = "$SYMLINK_TARGET" ]
}

debug() {
	if [ -n "$DPKG_DEBUG" ]; then
		echo "DEBUG: $PROGNAME: $*" >&2
	fi
}

error() {
	echo "$PROGNAME: error: $*" >&2
	exit 1
}

warning() {
	echo "$PROGNAME: warning: $*" >&2
}

usage() {
	cat <<END
Usage: $PROGNAME <command> <parameter>... -- <maintainer-script-parameter>...

Commands:
  supports <command>
	Returns 0 (success) if the given command is supported, 1 otherwise.
  rm_conffile <conffile> [<last-version> [<package>]]
	Remove obsolete conffile. Must be called in preinst, postinst and
	postrm.
  mv_conffile <old-conf> <new-conf> [<last-version> [<package>]]
	Rename a conffile. Must be called in preinst, postinst and postrm.
  symlink_to_dir <pathname> <old-symlink-target> [<last-version> [<package>]]
	Replace a symlink with a directory. Must be called in preinst,
	postinst and postrm.
  dir_to_symlink <pathname> <new-symlink-target> [<last-version> [<package>]]
	Replace a directory with a symlink. Must be called in preinst,
	postinst and postrm.
  help
	Display this usage information.
END
}

badusage() {
	echo "$PROGNAME: error: $1" >&2
	echo >&2
	echo "Use '$PROGNAME help' for program usage information." >&2
	exit 1
}

# Main code
set -e

PROGNAME=$(basename "$0")
version="1.18.25"
command="$1"
[ $# -gt 0 ] || badusage "missing command"
shift

case "$command" in
supports)
	case "$1" in
	rm_conffile|mv_conffile|symlink_to_dir|dir_to_symlink)
		code=0
		;;
	*)
		code=1
		;;
	esac
	if [ -z "$DPKG_MAINTSCRIPT_NAME" ]; then
		warning "environment variable DPKG_MAINTSCRIPT_NAME missing"
		code=1
	fi
	if [ -z "$DPKG_MAINTSCRIPT_PACKAGE" ]; then
		warning "environment variable DPKG_MAINTSCRIPT_PACKAGE missing"
		code=1
	fi
	exit $code
	;;
rm_conffile)
	rm_conffile "$@"
	;;
mv_conffile)
	mv_conffile "$@"
	;;
symlink_to_dir)
	symlink_to_dir "$@"
	;;
dir_to_symlink)
	dir_to_symlink "$@"
	;;
_internal_pkg_must_own_file)
	# This is an internal command, must not be used outside this program.
	internal_pkg_must_own_file "$@"
	;;
--help|help|-?)
	usage
	;;
--version)
	cat <<-END
	Debian $PROGNAME version $version.

	This is free software; see the GNU General Public License version 2 or
	later for copying conditions. There is NO warranty.
	END
	;;
*)
	badusage "command $command is unknown
Hint: upgrading dpkg to a newer version might help."
esac

exit 0

Youez - 2016 - github.com/yon3zu
LinuXploit