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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
# taskfunc.subr -- generic package task
#
# SYNOPSIS
# task_is_function <value>
#
# task_function add | remove [<stage>]
# task_function check-add | check-remove [<stage>]
#
# DESCRIPTION
# task_is_function checks whether <value> is a shell function defined
# in the current environment.
#
# task_function supports four actions: "add", "remove", "check-add",
# and "check-remove". The function reads standard input line by line
# and looks for lines of the form:
#
# # TASK: <taskname> [<arg> ...]
#
# <taskname> is the name of the task to invoke, and the remaining
# arguments are passed to the standard input of the task function.
#
# The task function is invoked as:
#
# <taskname> <action> [<stage>]
#
# The task function should return 0 for unknown actions.
#
# The <stage> is an optional parameter that is one of four values:
#
# preinstall invoked from the preinstall task
# preremove invoked from the preremove task
# postinstall invoked from the postinstall task
# postremove invoked from the postremove task
#
# RETURN VALUES
# task_is_function returns 0 if the value is a shell function, and >0
# otherwise.
#
# task_function returns the return value of the task invoked.
#
__task_taskfunc__="yes"
task_is_function()
{
type "$1" | while read line; do
case $line in
*" function") return 0 ;;
esac
return 1
done
}
task_function()
{
: ${AWK:=awk}
local arg
local OPTIND=1
while getopts ":s" arg "$@"; do
case $arg in
s) : "silently accept to match other package tasks" ;;
*) return 127 ;;
esac
done
shift $(( ${OPTIND} - 1 ))
[ $# -gt 0 ] || return 127
local action="$1"; shift
local stage="$1"
# Use AWK to re-sequence the standard input.
${AWK} 'BEGIN {
ws = "[[:space:]]"
hashtag_re = "^" ws "*#" ws "+TASK:" ws "+"
}
match( $0, hashtag_re ) > 0 {
name = $3
if ( length( name ) > 0 ) {
sub( hashtag_re name ws "+", "" )
n = ( name in max_line ) ? max_line[name] + 1 : 1
max_line[name] = n
line[name, n] = $0
if ( !( name in tasks ) ) {
tasks[name] = name
n = max_task ? max_task + 1 : 1
max_task = n
task[n] = name
}
}
}
END {
for ( i = 1; i <= max_task; i++ )
{
name = task[i]
print "# FUNCTION: " name
for ( j = 1; j <= max_line[name]; j++ ) {
print line[name, j]
}
print "# END"
}
}
' | (
local hash tag name task line
while read hash tag name; do
case $hash/$tag in
"#/FUNCTION:")
# valid input stream
task=$name ;;
*) return 0
esac
task_is_function "$task" || return 1
while read line; do
set -- $line; hash="$1"; tag="$2"; name="$3"
case $hash/$tag in "#/END") break ;; esac
echo "$line"
done | $task $action $stage
done
)
}
|
