diff options
Diffstat (limited to 'usr.sbin/bsdconfig/share/variable.subr')
| -rw-r--r-- | usr.sbin/bsdconfig/share/variable.subr | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/usr.sbin/bsdconfig/share/variable.subr b/usr.sbin/bsdconfig/share/variable.subr new file mode 100644 index 0000000..235f6dc --- /dev/null +++ b/usr.sbin/bsdconfig/share/variable.subr @@ -0,0 +1,185 @@ +if [ ! "$_VARIABLE_SUBR" ]; then _VARIABLE_SUBR=1 +# +# Copyright (c) 2012 Devin Teske +# All Rights Reserved. +# +# 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 AUTHOR 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 AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INLUDING, 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. +# +# $FreeBSD$ +# +############################################################ INCLUDES + +BSDCFG_SHARE="/usr/share/bsdconfig" +. $BSDCFG_SHARE/common.subr || exit 1 +f_dprintf "%s: loading includes..." variable.subr +f_include $BSDCFG_SHARE/dialog.subr + +############################################################ GLOBALS + +VARIABLES= + +# +# Default behavior is to call f_variable_set_defaults() when loaded. +# +: ${VARIABLE_SELF_INITIALIZE=1} + +# +# File to write when f_dump_variables() is called. +# +: ${VARIABLE_DUMPFILE:=/etc/bsdconfig.vars} + +############################################################ FUNCTIONS + +# f_variable_new $handle $variable +# +# Register a new variable named $variable with the given reference-handle +# $handle. The environment variable $handle is set to $variable allowing you to +# use the f_getvar() function (from common.subr) with $handle to get the value +# of environment variable $variable. For example: +# +# f_variable_new VAR_ABC abc +# +# allows the later indirection: +# +# f_getvar $VAR_ABC +# +# to return the value of environment variable `abc'. Variables registered in +# this manner are recorded in the $VARIABLES environment variable for later +# allowing dynamic enumeration of so-called `registered/advertised' variables. +# +f_variable_new() +{ + local handle="$1" variable="$2" + [ "$handle" ] || return $FAILURE + f_dprintf "variable.subr: New variable %s -> %s" "$handle" "$variable" + setvar $handle $variable + VARIABLES="$VARIABLES${VARIABLES:+ }$handle" +} + +# f_variable_get_value $var [ $fmt [ $opts ... ] ] +# +# Unless nonInteractive is set, prompt the user with a given value (pre-filled +# with the value of $var) and give them the chance to change the value. +# +# Unlike f_getvar() (from common.subr) which can return a variable to the +# caller on standard output, this function has no [meaningful] output. +# +# Returns success unless $var is either NULL or missing. +# +f_variable_get_value() +{ + local var="$1" cp + + [ "$var" ] || return $FAILURE + + if ! { f_getvar $var cp && ! f_interactive; }; then + shift 1 # var + cp=$( f_dialog_input "$( printf "$@" )" "$cp" ) && + setvar $var "$cp" + fi + + return $SUCCESS +} + +# f_variable_set_defaults +# +# Installs sensible defaults for registered/advertised variables. +# +f_variable_set_defaults() +{ + # + # Initialize various user-edittable values to their defaults + # + setvar $VAR_RELNAME "$UNAME_R" + + f_dprintf "f_variable_set_defaults: Defaults initialized." +} + +# f_dump_variables +# +# Dump a list of registered/advertised variables and their respective values to +# $VARIABLE_DUMPFILE. Returns success unless the file couldn't be written. If +# an error occurs, it is displayed using f_dialog_msgbox() (from dialog.subr). +# +f_dump_variables() +{ + local err sanitize_awk="{ gsub(/'/, \"'\\\\''\"); print }" + if ! err=$( + ( for handle in $VARIABLES; do + f_getvar $handle var || continue + f_getvar $var value || continue + value=$( echo "$value" | awk "$sanitize_awk" ) + printf "%s='%s'\n" "$var" "$value" + done > "$VARIABLE_DUMPFILE" ) 2>&1 + ); then + f_dialog_msgbox "$err" + return $FAILURE + fi +} + +# f_debugging +# +# Are we in debug mode? Returns success if extra DEBUG information has been +# requested (by setting $debug to non-NULL), otherwise false. +# +f_debugging() +{ + local value + f_getvar $VAR_DEBUG value && [ "$value" ] +} + +# f_interactive() +# +# Are we running interactively? Return error if $nonInteractive is set and non- +# NULL, otherwise return success. +# +f_interactive() +{ + local value + ! f_getvar $VAR_NONINTERACTIVE value || [ ! "$value" ] +} + +############################################################ MAIN + +# +# Variables that can be tweaked from config files +# +f_variable_new VAR_CONFIG_FILE configFile +f_variable_new VAR_DEBUG debug +f_variable_new VAR_DEBUG_FILE debugFile +f_variable_new VAR_NO_ERROR noError +f_variable_new VAR_NONINTERACTIVE nonInteractive +f_variable_new VAR_RELNAME releaseName + +# +# Self-initialize unless requested otherwise +# +f_dprintf "%s: VARIABLE_SELF_INITIALIZE=[%s]" \ + variable.subr "$VARIABLE_SELF_INITIALIZE" +case "$VARIABLE_SELF_INITIALIZE" in +""|0|[Nn][Oo]|[Oo][Ff][Ff]|[Ff][Aa][Ll][Ss][Ee]) : do nothing ;; +*) f_variable_set_defaults +esac + +f_dprintf "%s: Successfully loaded." variable.subr + +fi # ! $_VARIABLE_SUBR |
