#!/bin/sh
#
# Convert a /usr/local toolchain to a /usr/local/uclinux-dist toolchain
# installer that is date stamped appropriately.
#
# David McCullough <ucdevel@gmail.com>
#

if [ $# -lt 3 -o $# -gt 4 -o ! -f "$1" ]
then
	echo "usage: `basename $0` <tar-gz from / of usr local chain> <build-date> <cross> [prefix]"
	echo "       for example:"
	echo "       `basename $0` arm-linux-tools-20070808.tar.gz 20070808 arm-linux"
	echo "       `basename $0` mips-linux-tools-20130305.tar.gz 20130305 mips-linux mips-unknown-linux-gnu"
	echo ""
	echo "cross  - new tools will be called cross-date-gcc"
	echo "prefix - if existing prefix is different to cross, otherwise"
	echo "         it defaults to cross"
	exit 1
fi

ARCHIVE="$1"
DATE="$2"
CROSS="$3"
PREFIX="${4:-$CROSS}"
EXTRACT_DIR=/usr/local/uclinux-dist
LINK_DIR=/usr/local/bin
CLEAN_OLD=n

#
# helper to extract tar.gz from archive
#
# $1 = archive
#

cat_archive()
{
	case "$1" in
	*.sh)
		SKIP=`awk '/^__ARCHIVE_FOLLOWS__/ { print NR + 1; exit 0; }' "$1"`
		tail -n +$SKIP "$1"
		;;
	*)
		cat "$1"
		;;
	esac
}

#
# lets check the archive is pure ;-)
#

CHECK="/tmp/$$.check"
cat_archive "$ARCHIVE" | tar tvzf - > $CHECK
trap "rm -f $CHECK" 0

if egrep -v '(usr/local|usr/$)' $CHECK
then
	echo "Found files outside usr/local !"
	exit 1
fi
rm -f $CHECK
trap "" 0

#
# Now we generate a script to install this appropriately
#

INSTALL_FILE="$CROSS-tools-$DATE.sh"

cat <<!EOF > $INSTALL_FILE
#!/bin/sh

EXTRACT_DIR=$EXTRACT_DIR
LINK_DIR=$LINK_DIR
CLEAN_OLD=$CLEAN_OLD
CCACHE_OPTION=y

SCRIPT="\$0"
case "\${SCRIPT}" in
/*)
	;;
*)
	if [ -f "\${SCRIPT}" ]
	then
		SCRIPT="\`pwd\`/\${SCRIPT}"
	else
		SCRIPT="\`which \${SCRIPT}\`"
	fi
	;;
esac

cd /

if [ ! -f "\${SCRIPT}" ]
then
	echo "Cannot find the location of the install script (\$SCRIPT) ?"
	exit 1
fi

SKIP=\`awk '/^__ARCHIVE_FOLLOWS__/ { print NR + 1; exit 0; }' \${SCRIPT}\`

#
# find out where to put the buld of the archive
#
while :; do
	echo -n "Where would you like these tools installed? [\$EXTRACT_DIR]: "
	read t
	case "\$t" in
	"") break ;;
	*)
		if [ -w \`basename \$t\` -o -w \$t ]; then
			EXTRACT_DIR=\$t
			break
		fi
		echo "Neither \`basename \$t\` or \$t are writable"
		;;
	esac
done

#
# and where we need to install the "compiler" executables for running
#
while :; do
	echo -n "Install executable links into ? [\$LINK_DIR]: "
	read t
	case "\$t" in
	"") break ;;
	*)
		if [ -w \`basename \$t\` -o -w \$t ]; then
			LINK_DIR=\$t
			break
		fi
		echo "Neither \`basename \$t\` or \$t are writable"
		;;
	esac
done

#
# clean out old or possibly conflicting tools chains ?
#
while :; do
	echo "***** Warning - removal may break other non SG packaged tool chains"
	echo -n "Remove old or possible conflicting toolchains/files ? [\$CLEAN_OLD]: "
	read t
	case "\$t" in
	"") break ;;
	y|Y|[yY][eE][sS]) CLEAN_OLD=y; break ;;
	n|N|[nN][oO])     CLEAN_OLD=n; break ;;
	*) echo "Either Y or N will do :-)" ;;
	esac
done

#
# if they have ccache install,  let them use it by default :-)
#
if [ -x "\`which ccache\`" ]; then
	echo -n "You have ccache installed, always use it? [\$CCACHE_OPTION]: "
	read t
	case "\$t" in
	"") break ;;
	y|Y|[yY][eE][sS]) CCACHE_OPTION=y; break ;;
	n|N|[nN][oO])     CCACHE_OPTION=n; break ;;
	*) echo "Either Y or N will do :-)" ;;
	esac

fi
if [ "\$CCACHE_OPTION" = y ]; then
	CCACHE="\`which ccache\`"
else
	CCACHE=""
fi

#
# Now clean up old conflicting tool chains and directories
#
if [ "\$CLEAN_OLD" = "y" ]; then
	rm -rf "/usr/local/${CROSS}"
	rm -rf "/usr/local/lib/gcc-lib/${CROSS}"
	rm -rf "/usr/local/lib/gcc/${CROSS}"
	rm -rf "/usr/local/libexec/gcc/${CROSS}"
	rm -rf /usr/local/include/g++-v3
	rm -rf /usr/local/include/c++
	for i in /usr/local/bin/${CROSS}-*
	do
		case "\$i" in
		/usr/local/bin/${CROSS}-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-*)
			echo "\$i is ok, leaving..."
			;;
		*)
			echo "\$i is a conflict, removing..."
			rm -f "\$i"
			;;
		esac
	done
fi

#
# extract the toolchain and install the executables appropriately
#

[ -d \$EXTRACT_DIR ] || mkdir -p \$EXTRACT_DIR
if [ ! -d \$EXTRACT_DIR ]; then
	echo "Cannot make directory \$EXTRACT_DIR"
	exit 1
fi
rm -rf \$EXTRACT_DIR/${CROSS}-tools-${DATE}
if [ -d \$EXTRACT_DIR/${CROSS}-tools-${DATE} ]; then
	echo "Cannot remove \$EXTRACT_DIR/${CROSS}-tools-${DATE}"
	exit 1
fi
mkdir -p \$EXTRACT_DIR/${CROSS}-tools-${DATE}
if [ ! -d \$EXTRACT_DIR/${CROSS}-tools-${DATE} ]; then
	echo "Cannot make directory \$EXTRACT_DIR/${CROSS}-tools-${DATE}"
	exit 1
fi

(
	cd \$EXTRACT_DIR/${CROSS}-tools-${DATE} || exit 1
	tail -n +\${SKIP} \${SCRIPT} | gunzip | tar xf -
)

if [ ! -d \$EXTRACT_DIR/${CROSS}-tools-${DATE}/usr ]; then
	"Extraction failed,  no usr directory created in target"
	exit 1
fi

#
# move the binaries to a nicer location
#
for i in \$EXTRACT_DIR/${CROSS}-tools-${DATE}/usr/local/*
do
	mv "\$i" \$EXTRACT_DIR/${CROSS}-tools-${DATE}/.
done
rm -rf \$EXTRACT_DIR/${CROSS}-tools-${DATE}/usr

#
# create the executables
#
for i in \$EXTRACT_DIR/${CROSS}-tools-${DATE}/bin/*
do
	BASE="\`basename \$i\`"
	BASE="\`echo \$BASE | sed 's/^${PREFIX}-//'\`"
	rm -f \$LINK_DIR/${CROSS}-${DATE}-\$BASE
	echo "#!/bin/sh" >> \$LINK_DIR/${CROSS}-${DATE}-\$BASE
	if [ "\$CCACHE" ]; then
		case "\$BASE" in
		*gcc|*g++|*c++)
			echo "exec \$CCACHE \$i \\"\\\$@\\"" >> \
				\$LINK_DIR/${CROSS}-${DATE}-\$BASE
			;;
		esac
	fi
	# fallback to non cache in case ccache is removed
	printf "exec \$i \\"\\\$@\\"" >> \$LINK_DIR/${CROSS}-${DATE}-\$BASE
	chmod 755 \$LINK_DIR/${CROSS}-${DATE}-\$BASE
done

exit 0
__ARCHIVE_FOLLOWS__
!EOF

cat_archive "$ARCHIVE" >> $INSTALL_FILE
chmod +x $INSTALL_FILE