#!/bin/sh
#
#    File:   decipher-install
#    Author: Tom Kuhn (original by Victor Abrash)
#    Date:   Fri Aug 26 12:41:03 1994
#
#    Description:
#	This script installs files for submodules of the DECIPHER (TM) system,	
#	when using the make release-* targets.  
#
#	It takes a variable number of arguments with this convention:  
#
#		decipher-install <mode> <file1> ... <fileN> <directory>
#
#    Copyright (c) 1994-2011 SRI International.  All Rights Reserved.
#
#    RCS ID: $Id: decipher-install,v 1.8 2011/10/21 21:25:58 stolcke Exp $
#

# By using this flag, the script runs through all error checking and
# reports all errors before exiting
error=

if [ "$1" = -p ]; then
	p_option=-p
	shift
fi

usage() {
    echo "Usage:  `basename $0` [-p] <mode> <file1> ... <fileN> <directory>"	>&2
    echo "	mode:                 file permission mode, in octal"		>&2
    echo "	file1 ... fileN:      files to be installed"			>&2
    echo "	directory:            where the files should be installed"	>&2
    echo ""									>&2
    echo "files = " $FILES							>&2
    echo "directory = " $DIR							>&2
    echo "mode = " $MODE							>&2
    echo ""									>&2
    exit 1
}

# Get the arguments, check usage.  Have to bail completely if there
# aren't enough arguments.
if [ $# -lt 3 ]; then
	usage
	exit -1
fi

MODE=$1
shift

FILES=

while [ $# -gt 1 ]; do
	FILES="$FILES $1"
	shift
done

DIR=$1

# we should check that these are valid:
# First, check the mode
case "$MODE" in
0[1-7][0-7][0-7]) ;;
*)	echo "ERROR: Mode ($MODE) is not a valid permission setting"	>&2
	exit 1
esac

# Now check each file
for file in $FILES
do
   if [ ! -f $file ]; then
      echo "ERROR:  File to be installed ($file) does not exist."	>&2
      error=1
   elif [ -z $file ]; then
      echo "ERROR:  File to be installed ($file) is zero length."	>&2
      error=1
   elif [ ! -f $file ]; then
      echo "ERROR:  File to be installed ($file) is not a plain file."	>&2
      error=1
   fi
done

if [ ! -d $DIR ]; then
   echo "WARNING: creating directory ${DIR}"	>&2
   mkdir ${DIR}
fi

# Now check the directory
if [ ! -d $DIR ]; then
   echo "ERROR:  Installation directory ($DIR) does not exist or is not a directory."	>&2
   error=1
elif [ ! -w $DIR ]; then
   echo "ERROR:  Don't have write permission in installation directory ($DIR)."	>&2
   error=1
fi

# check that $DIR is a valid destination: 
# currently, this means we should be able to install files under
# /include, /bin/, and /lib/ directories under /home/decipher:

case "$DIR" in
*/bin|*/bin/*|*/include|*/lib/*)	;;
*)
   echo "ERROR:  You can install files only in .../include, .../bin/, or .../lib/ directories."	>&2
   error=1
   ;;
esac

# Bail out if there have been errors:
if [ -n "$error" ]; then
    usage
fi

# Install the files:

#echo "ginstall -p -m ${MODE} ${FILES} ${DIR}"
#ginstall -p -m ${MODE} ${FILES} ${DIR} 

for file in $FILES
do
	base=`basename $file`

	# remove executable backups not accessed in one day
	find $DIR -name "$base.~[0-9]*" -perm -0500 -atime +1 -print | \
	while read file2
	do
	    echo "removing old backup $file2"
	    rm -f $file2
	done

	# backup executables accessed within the last day
	find $DIR -name $base -perm -0500 -atime -1 -print | \
	while read file2
	do
	    echo "$file2 is in use; backing up to $file2.~$$"
	    mv $file2 $file2.~$$
	done

	rm -f $DIR/$base
	cp $p_option $file $DIR
	chmod $MODE $DIR/$base
done

exit 0