bin/minstall

#!/bin/sh


# A minimal replacement for 'install' that supports installing symbolic links.
# Only a limited number of options are supported:
# -d dir          Create a directory
# -m mode         Sets a file's mode when installing


# If these commands aren't portable, we'll need some "if (arch)" type stuff
SYMLINK="ln -s"
MKDIR="mkdir -p"
RM="rm -f"

MODE=""

if [ "$1" = "-d" ] ; then
	# make a directory path
	$MKDIR "$2"
	exit 0
fi

if [ "$1" = "-m" ] ; then
	# set file mode
	MODE=$2
	shift 2
fi

# install file(s) into destination
if [ $# -ge 2 ] ; then

	# Last cmd line arg is the dest dir
	for FILE in $@ ; do
		DEST="$FILE"
	done

	# Loop over args, moving them to DEST directory
	I=1
	for FILE in $@ ; do
		if [ $I = $# ] ; then
			# stop, don't want to install $DEST into $DEST
			exit 0
		fi

		PWDSAVE=`pwd`

		# determine file's type
		if [ -h "$FILE" ] ; then
			#echo $FILE is a symlink
			# Unfortunately, cp -d isn't universal so we have to
			# use a work-around.

			# Use ls -l to find the target that the link points to
			LL=`ls -l "$FILE"`
			for L in $LL ; do
				TARGET=$L
			done
			#echo $FILE is a symlink pointing to $TARGET

			FILE=`basename "$FILE"`
			# Go to $DEST and make the link
			cd "$DEST"        # pushd
				$RM "$FILE"
				$SYMLINK "$TARGET" "$FILE"
			cd "$PWDSAVE"     # popd

		elif [ -f "$FILE" ] ; then
			#echo "$FILE" is a regular file
			# Only copy if the files differ
			if ! cmp -s $FILE $DEST/`basename $FILE`; then
				$RM "$DEST/`basename $FILE`"
				cp "$FILE" "$DEST"
			fi
			if [ $MODE ] ; then
				FILE=`basename "$FILE"`
				chmod $MODE "$DEST/$FILE"
			fi
		else
			echo "Unknown type of argument: " "$FILE"
			exit 1
		fi

		I=`expr $I + 1`
	done

	exit 0
fi

# If we get here, we didn't find anything to do
echo "Usage:"
echo "  install -d dir                      Create named directory"
echo "  install [-m mode] file [...] dest   Install files in destination"