ukvm-configure

#!/bin/sh
# Copyright (c) 2015-2017 Contributors as noted in the AUTHORS file
#
# This file is part of ukvm, a unikernel monitor.
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
# AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

die ()
{
    echo "ukvm-configure: error: $@" 1>&2
    exit 1
}

if [ "$#" -lt 1 ]; then
    cat <<EOM 1<&2
Usage: ukvm-configure SOURCEDIR [ MODULES ... ]

Configures ukvm for your target, enabling the MODULES specified.

Generates a Makefile.ukvm in the current directory. Use the "ukvm-bin" target
to build ukvm.

Options:
    SOURCEDIR is the path to the ukvm source
    MODULES can be any combination of: net blk gdb

To use a cross-compiler, set the UKVM_CC environment variable.
To build ukvm statically, set the UKVM_STATIC environment variable.
EOM
    exit 1
fi

UKVM_CC=${UKVM_CC:-cc}
UKVM_SRC=$(readlink -f $1)
if [ ! -d ${UKVM_SRC} -o ! -f ${UKVM_SRC}/ukvm_core.c ]; then
    die "Not a ukvm source directory: ${UKVM_SRC}"
fi
shift

add_cflags ()
{
    UKVM_CFLAGS="${UKVM_CFLAGS} $@"
}

add_obj ()
{
    for i in "$@"; do
        UKVM_OBJS="${UKVM_OBJS} _build-ukvm/${i}"
    done
}

add_header ()
{
    for i in "$@"; do
        UKVM_HEADERS="${UKVM_HEADERS} ${UKVM_SRC}/${i}"
    done
}

add_module ()
{
    if [ ! -f ${UKVM_SRC}/ukvm_module_$1.c ]; then
        die "Invalid module: $1"
    fi
    enableit="-DUKVM_MODULE_$(echo $1 | tr '[a-z]' '[A-Z]')"
    add_obj "ukvm_module_$1.o"
    add_cflags "${enableit}"
}

UKVM_CFLAGS=
UKVM_LDFLAGS=
UKVM_LDLIBS=
UKVM_HEADERS=
UKVM_OBJS=
add_obj ukvm_core.o ukvm_elf.o ukvm_main.o
add_header ukvm.h ukvm_guest.h ukvm_cc.h

for module in "$@"; do
    [ -z "${module}" ] && continue
    add_module ${module}
done

[ -n "${UKVM_STATIC}" ] && UKVM_LDFLAGS="-static"

TARGET=$(${UKVM_CC} -dumpmachine)
[ $? -ne 0 ] &&
    die "Error running '${UKVM_CC} -dumpmachine', is your compiler working?"
case ${TARGET} in
    x86_64-*linux*)
        add_obj ukvm_hv_kvm.o ukvm_hv_kvm_x86_64.o ukvm_cpu_x86_64.o
        add_header ukvm_hv_kvm.h ukvm_cpu_x86_64.h
        ;;
    x86_64-*freebsd1[12]*)
        add_obj ukvm_hv_freebsd.o ukvm_hv_freebsd_x86_64.o ukvm_cpu_x86_64.o
        add_header ukvm_hv_freebsd.h ukvm_cpu_x86_64.h
        ;;
    amd64-*-openbsd6.[3-9])
        add_obj ukvm_hv_openbsd.o ukvm_hv_openbsd_x86_64.o ukvm_cpu_x86_64.o
        add_header ukvm_hv_openbsd.h ukvm_cpu_x86_64.h
        ;;
    aarch64-*linux*)
        add_obj ukvm_hv_kvm.o ukvm_hv_kvm_aarch64.o ukvm_cpu_aarch64.o
        add_header ukvm_hv_kvm.h ukvm_cpu_aarch64.h
        ;;
    *)
        die "Unsupported compiler target: ${TARGET}"
        ;;
esac

cat <<EOF> Makefile.ukvm
# Generated by 'ukvm-configure $@'
# Using compiler '${UKVM_CC}', target '${TARGET}'

.BEGIN: ; @echo -e Warning: \$(MAKEFILE) requires GNU make.\\\\nWarning: Attempting to build with \"gmake -f \$(MAKEFILE) \$(.TARGETS)\" for you now. && gmake -f \$(MAKEFILE) \$(.TARGETS)

.PHONY: all
all: ukvm-bin

UKVM_CC=${UKVM_CC}
UKVM_CFLAGS=-Wall -Werror -std=c99 -O2 -g ${UKVM_CFLAGS}
UKVM_LDFLAGS=${UKVM_LDFLAGS}
UKVM_LDLIBS=${UKVM_LDLIBS}

UKVM_OBJS=${UKVM_OBJS}
UKVM_HEADERS=${UKVM_HEADERS}

\$(UKVM_OBJS): \$(UKVM_HEADERS)

_build-ukvm:
	mkdir -p _build-ukvm

_build-ukvm/ukvm_%.o: ${UKVM_SRC}/ukvm_%.c \$(MAKEFILE_LIST) | _build-ukvm
	\$(UKVM_CC) \$(UKVM_CFLAGS) -c \$< -o \$@

ukvm-bin: \$(UKVM_OBJS) \$(MAKEFILE_LIST)
	\$(UKVM_CC) \$(UKVM_LDFLAGS) -o \$@ \$(UKVM_OBJS) \$(UKVM_LDLIBS)

.PHONY: ukvm-clean
ukvm-clean:
	rm -rf _build-ukvm
	rm -f ukvm-bin
EOF