Blame Scripts/Bash/Functions/Commons/cli_getConfigLines.sh

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#!/bin/bash
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#
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# cli_getConfigLines.sh -- This function standardizes the way
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# configuration lines are retrieved form configuration files. As
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# arguments, the configuration file absolute path, the configuration
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# section name, and the configuration option name must be provided.
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#
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# Copyright (C) 2009, 2010, 2011, 2012 The CentOS Project
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function cli_getConfigLines {
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    # Initialize absolute path to configuration file.
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    local CONFIG_ABSPATH="$1"
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    # Verify that configuration file does exist.
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    cli_checkFiles -e ${CONFIG_ABSPATH}
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    # Initialize configuration section name where the variable value
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    # we want to to retrieve is set in.
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    local CONFIG_SECTION="$2"
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    # Be sure the configuration section name has the correct format.
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    if [[ ! $CONFIG_SECTION =~ '^[[:alnum:]._-]+$' ]];then
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        cli_printMessage "`gettext "The configuration section provided is incorrect."`" --as-error-line
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    fi
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    # Initialize variable name we want to retrieve value from.
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    local CONFIG_OPTION="$3"
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    # Verify configuration variable name. When no variable name is
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    # provided print all configuration lines that can be considered as
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    # well-formed paths. Be sure configuration variable name starts
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    # just at the beginning of the line.
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    if [[ ! $CONFIG_OPTION =~ '^[[:alnum:]_./-]+$' ]];then
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        CONFIG_OPTION='[[:alnum:]_./-]+='
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    fi
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    # Retrieve configuration lines from configuration file.
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    local CONFIG_LINES=$(cat ${CONFIG_ABSPATH} \
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        | egrep -v '^#' \
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        | egrep -v '^[[:space:]]*$' \
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        | sed -r -n "/^\[${CONFIG_SECTION}\][[:space:]]*$/,/^\[/p" \
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        | egrep -v '^\[' | sort | uniq \
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        | egrep "^${CONFIG_OPTION}")
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    # Output value related to variable name.
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    echo "$CONFIG_LINES"
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}