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# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
# preremove.subr -- pre-removal actions for packages
#
# SYNOPSIS
# task_preremove <datafile>
#
# DESCRIPTION
# The task_preremove function performs actions that MUST occur BEFORE
# deleting the package files for the removal to be successful:
#
# o Unregister GNU info files.
# o Remove GTK+ icon theme caches.
# o Remove unmodified configuration files.
#
# The datafile contains lines of the form:
#
# # <keyword>: <arg> ...
#
# These lines are used as input to the various script functions.
#
# RETURN VALUES
# Returns 0 on success, and >0 if an error occurs.
#
# ENVIRONMENT
# The following variables are used if they are set:
#
# TASK_VERBOSE
# List of package tasks that should emit verbose output.
# If ${TASK_VERBOSE} is "all", then all tasks are verbose.
# If ${TASK_VERBOSE} is "none", then no tasks are verbose.
# Otherwise, if one of the tasks is "default", then the
# default list of tasks are verbose.
#
__task_preremove__="yes"
task_load files
task_load icon_themes
task_load info_files
task_load sort
task_load taskfunc
task_preremove()
{
: ${TASK_VERBOSE:=default}
[ $# -gt 0 ] || return 127
local datafile="$1"; shift
[ -f "$datafile" ] || return 1
local stage="preremove"
# $verbose are the package tasks that give verbose output.
# Expand "all", "default" and "none" to a fixed list of tasks.
#
local verbose="${TASK_VERBOSE}"
case " $verbose " in
" all ")
verbose="files function icon_themes info_files" ;;
*" default "*)
# These tasks are verbose by default since they touch
# system files and directories.
#
verbose="files function" ;;
" none ")
verbose= ;;
esac
local silent
# Unregistering a GNU info files requires reading the file to find
# all nodes listed in the file, so it must be done before the file
# is removed. Any errors in unregistering GNU info files are
# non-fatal.
#
case " $verbose " in
*" info_files "*)
silent= ;;
*) silent="-s" ;;
esac
task_info_files $silent remove $stage < $datafile
# GTK+ icon theme caches exist in the package installation
# directory, so they must be removed before their packages can be
# successfully removed. Any errors in removing icon caches are
# non-fatal.
#
case " $verbose " in
*" icon_themes "*)
silent= ;;
*) silent="-s" ;;
esac
task_icon_themes $silent remove $stage < $datafile
# Removing a configuration file requires comparing it to the
# example file from which it was copied, so it must be done before
# the example file is removed. Any errors in removing
# configuration files are non-fatal.
#
case " $verbose " in
*" files "*)
silent= ;;
*) silent="-s" ;;
esac
task_files $silent remove $stage < $datafile
# Run the generic package tasks.
case " $verbose " in
*" function "*)
silent= ;;
*) silent="-s" ;;
esac
if task_sort -r < $datafile | task_function $silent remove $stage; then
: "success"
else
# Errors from the generic package tasks are fatal.
return 1
fi
return 0
}
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