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l8íºð3Ø:³¤¬KX¯UÿÙ#! /bin/bash
#                               -*- Mode: Sh -*-
# ucfr ---
# Author           : Manoj Srivastava ( srivasta@glaurung.internal.golden-gryphon.com )
# Created On       : Tue Apr 11 11:09:15 2006
# Created On Node  : glaurung.internal.golden-gryphon.com
# Last Modified By : Manoj Srivastava
# Last Modified On : Tue Apr 11 13:50:58 2006
# Last Machine Used: glaurung.internal.golden-gryphon.com
# Update Count     : 43
# Status           : Unknown, Use with caution!
# HISTORY          :
# Description      :
#
# Register a configuration file as belonging to a package
#
# arch-tag: 6e1d33fe-a930-41ce-8d0f-c87f87b19918
#

# make sure we exit on error
set -e

# set the version and revision
progname=$(basename "$0")
pversion='Revision 3.00'
######################################################################
########                                                     #########
########              Utility functions                      #########
########                                                     #########
######################################################################
setq() {
    # Variable Value Doc_string
    if [ "x$2" = "x" ]; then
	echo >&2 "$progname: Unable to determine $3"
	exit 1;
    else
	if [ "x$VERBOSE" != "x" ]; then
	    echo >&2 "$progname: $3 is $2";
	fi
	eval "$1=\"\$2\"";
    fi
}

withecho () {
        echo "$@" >&2
        "$@"
}


purge_from_registry () {
    if [ ! -e "$statedir/registry" ]; then
        echo >&2 "$progname: Internal error: $statedir/registry does not exist";
        exit 6;
    fi

    if [ "$count" -eq 0 ]; then
        if [ "X$VERBOSE" != "X" ]; then
            echo >&2 "$progname: Association already purged. No changes.";
        fi
        exit 0;
    fi
    old_pkg=$(egrep "[[:space:]]${real_conf_file_re}$" "$statedir/registry" | \
        awk '{print $1;}' );
    if [ "$pkg" != "$old_pkg"  ]; then
        echo >&2 "ucfr: Association belongs to $old_pkg, not $pkg";
        if [ "X$FORCE" = "X" ]; then
            echo >&2 "ucfr: Aborting";
            exit 5;
        fi
    fi

    # OK, so we have something to purge.
    for i in $(/usr/bin/seq 6 -1 0); do
	if [ -e "${statedir}/registry.${i}" ]; then
	    if [ "X$docmd" = "XYES" ]; then
		cp -f "${statedir}/registry.${i}"  "${statedir}/registry.$(($i + 1))"
	    else
		echo cp -f "${statedir}/registry.${i}" "${statedir}/registry.$(($i + 1))"
	    fi
	fi
    done
    if [ "X$docmd" = "XYES" ]; then
	cp -f "$statedir/registry"  "$statedir/registry.0"
    else
	echo cp -f "$statedir/registry"  "$statedir/registry.0"
    fi
    if [ "X$docmd" = "XYES" ]; then
	set +e
	if [ "X$VERBOSE" != "X" ]; then
	    echo "egrep -v [[:space:]]${real_conf_file_re}$ $statedir/registry >\\"
            echo "	$statedir/registry.tmp || true";
	fi
	#echo "egrep -v [[:space:]]${real_conf_file_re}$ $statedir/registry"
	egrep -v "[[:space:]]${real_conf_file_re}$" "$statedir/registry" > \
	    "$statedir/registry.tmp" || true;
	if [ "X$docmd" = "XYES" ]; then
	    mv -f "$statedir/registry.tmp"  "$statedir/registry"
	else
	    echo mv -f "$statedir/registry.tmp"  "$statedir/registry"
	fi
	set -e
    fi
}

replace_in_registry () {
    if [ ! -e "$statedir/registry" ]; then
        echo >&2 "$progname: Internal error: $statedir/registry does not exist";
        exit 6;
    fi
    if [ "$count" -eq 1 ]; then
        old_pkg=$(egrep "[[:space:]]${real_conf_file_re}$" "$statedir/registry" | \
            awk '{print $1;}' );

        if [ "$pkg" != "$old_pkg" ]; then
            if [ "X$FORCE" = "X" ]; then
                echo >&2 "$progname: Attempt from package $pkg  to take ${real_conf_file} away from package $old_pkg";
                echo >&2 "ucfr: Aborting.";
                exit 4;
            fi
        else
            if [ "X$VERBOSE" != "X" ]; then
                echo >&2 "$progname: Association already recorded. No changes.";
            fi
            exit 0;
        fi
    fi

    for i in $(/usr/bin/seq 6 -1 0); do
	if [ -e "${statedir}/registry.${i}" ]; then
	    if [ "X$docmd" = "XYES" ]; then
		cp -f "${statedir}/registry.${i}" \
		    "${statedir}/registry.$(($i + 1))"
	    else
		echo cp -f "${statedir}/registry.${i}" \
		    "${statedir}/registry.$(($i + 1))"
	    fi
	fi
    done
    if [ "X$docmd" = "XYES" ]; then
	cp -f "$statedir/registry"  "$statedir/registry.0"
    else
	echo cp -f "$statedir/registry"  "$statedir/registry.0"
    fi
    if [ "X$docmd" = "XYES" ]; then
	set +e
	if [ "X$VERBOSE" != "X" ]; then
	    echo "egrep -v \"[[:space:]]${real_conf_file_re}$\" \"$statedir/registry\"  \\"
            echo "	$statedir/registry.tmp || true"
	    echo "echo \"$pkg 	 $real_conf_file\" >> \"$statedir/registry.tmp\""
	    echo "mv -f  $statedir/registry.tmp $statedir/registry"
	fi
	egrep -v "[[:space:]]${real_conf_file_re}$" "$statedir/registry" > \
	    "$statedir/registry.tmp" || true;
	echo "$pkg 	 $real_conf_file" >>   "$statedir/registry.tmp";
	mv -f "$statedir/registry.tmp"  "$statedir/registry"
	set -e
    else
	echo "egrep -v \"[[:space:]]${real_conf_file_re}$\" \"$statedir/registry\"  \\"
        echo "	$statedir/registry.tmp || true"
	echo "echo \"$pkg 	 $real_conf_file\" >> \"$statedir/registry.tmp\""
	echo "mv -f  $statedir/registry.tmp $statedir/registry"
    fi
}


usageversion () {
        cat >&2 <<END
Debian GNU/Linux $progname $pversion.
           Copyright (C) 2002-2006 Manoj Srivastava.
This is free software; see the GNU General Public Licence for copying
conditions.  There is NO warranty.

Usage: $progname  [options] package_name path_for_configuration_file
Options:
     -h,     --help          print this message
     -f      --force         Force the association, even if another package
                             used to own the configuration file.
     -d [n], --debug    [n]  Set the Debug level to N
     -n,     --no-action     Dry run. No action is actually taken.
     -v,     --verbose       Make the script verbose
     -p,     --purge         Remove any reference to the package/file association
                             from the records
             --state-dir bar Set the state directory to bar instead of the
                             default '/var/lib/ucf'. Used mostly for testing.
END

}

######################################################################
########                                                     #########
########              Command line args                      #########
########                                                     #########
######################################################################
#
# Long term variables#
#
docmd='YES'
action='withecho'
action=
DEBUG=0
VERBOSE=''
statedir='/var/lib/ucf';
THREEWAY=

# Note that we use `"$@"' to let each command-line parameter expand to a
# separate word. The quotes around `$@' are essential!
# We need TEMP as the `eval set --' would nuke the return value of getopt.
TEMP=$(getopt -a -o hd::D::fnvp -n "$progname" \
      --long help,debug::,DEBUG::,force,no-action,purge,verbose,state-dir: \
             -- "$@")

if [ $? != 0 ] ; then
    echo "Error handling options.Terminating..." >&2 ;
    exit 1 ;
fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

while true ; do
    case "$1" in
	-h|--help) usageversion;                        exit 0  ;;
	-n|--no-action) action='echo'; docmd='NO';      shift   ;;
	-v|--verbose) VERBOSE=1;                        shift   ;;
	-f|--force)   FORCE=1;                          shift   ;;
	--state-dir)  opt_state_dir="$2";               shift 2 ;;
	-D|-d|--debug|--DEBUG)
            # d has an optional argument. As we are in quoted mode,
            # an empty parameter will be generated if its optional
            # argument is not found.
	    case "$2" in
		"") setq DEBUG 1    "The Debug value"; shift 2 ;;
		*)  setq DEBUG "$2" "The Debug value"; shift 2 ;;
	    esac ;;
        -p|--purge) PURGE=YES;                         shift   ;;
	--)  shift ;                                   break   ;;
	*) echo >&2 "$progname: Internal error!" ; exit 1 ;;
    esac
done
# Need to run as root, or else the
if test "$(id -u)" != 0; then
    if [ "$docmd" = "YES" ]; then
        echo "$progname: Need to be run as root." >&2
        echo "$progname: Setting up no action mode." >&2
        action='echo';
        docmd='NO';
    fi
fi

if [ $# != 2 ]; then
    echo >&2 "$progname: *** ERROR: Need exactly two arguments, got $#";
    echo >&2 ""
    usageversion;
    exit 3 ;
fi

# We have here a configuration file, which can be a symlink, and may
# contain characters that are unsafe in regular expressions
setq pkg  "$1" "The Package name";
setq conf_file "$2" "The Configuration file";
setq real_conf_file "$(readlink -q -m $conf_file)" "The (real) Configuration file";

pkg_re="$(echo $pkg       | sed -e 's,+,\\+,')"
conf_file_re="$(echo $conf_file | sed -e 's,+,\\+,')"
real_conf_file_re="$(echo $real_conf_file | sed -e 's,+,\\+,')"

case $conf_file_re in
    /*)
        : echo fine
        ;;
    *)
        echo >&2 "$progname: Need a fully qualified path for the file \"$conf_file\""
        # Don't exit with an error for etch'
        exit 0;
esac

# Load site defaults and over rides.
if [ -f /etc/ucf.conf ]; then
    . /etc/ucf.conf
fi

# Command line, env variable, config file, or default
if [ ! "x$opt_state_dir" = "x" ]; then
    setq statedir "$opt_state_dir" "The State directory"
elif [ ! "x$UCF_STATE_DIR" = "x" ]; then
    setq statedir "$UCF_STATE_DIR" "The State directory"
elif [ ! "x$conf_state_dir" = "x" ]; then
    setq statedir "$conf_state_dir" "The State directory"
else
    setq statedir '/var/lib/ucf'  "The State directory"
fi

# VERBOSE of 0 is supposed to be the same as not setting VERBOSE
if [ "X$VERBOSE" = "X0" ]; then
    VERBOSE=''
fi

#
if [ -e "$statedir/registry" -a ! -w "$statedir/registry" ]; then
    echo >&2 "$progname: do not have write privilege to the registry data"
    if [ "X$docmd" = "XYES" ]; then
	exit 1;
    fi
fi

# test and see if this file exists in the database
if [ ! -d "$statedir" ]; then
    $action mkdir -p "$statedir"
fi

if [ ! -f "$statedir/registry" ]; then
    $action touch "$statedir/registry"
fi


if [ "X$VERBOSE" != "X" ]; then
    echo >&2 "$progname: The registry exists"
fi

# sanity check
count=$(egrep --count "[[:space:]]${real_conf_file_re}$" "$statedir/registry") || true

if [ "$count" -ge 2 ]; then
    echo >&2 "$progname: Corrupt registry: Duplicate entries for ${conf_file}";
    egrep "[[:space:]]${real_conf_file_re}$" "$statedir/registry";
    exit "$count";
fi

if [ "X$PURGE" != "X" ]; then
    $action purge_from_registry
else
    $action replace_in_registry
fi


exit 0;