# Copyright (C) 2023 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

AC_PREREQ([2.69])
AC_INIT([trisquel-automatic-netinstall-qemu], [0.1],
        [GNUtoo@cyberdimension.org])
AC_CONFIG_SRCDIR([configure.ac])
AC_PROG_AWK
AC_PROG_MKDIR_P
AM_INIT_AUTOMAKE([foreign])

AC_SUBST([ENABLE_KVM], [])
AC_SUBST([MIRROR_HTTP_PROXY], [])
AC_SUBST([TRISQUEL_ROOTFS_SIZE], [])
AC_SUBST([TRISQUEL_NETINSTALL], [])

AC_ARG_ENABLE(kvm,
  [AS_HELP_STRING([--disable-kvm],
                  [Use Kvm to obtain a public IP address (default=enabled)])],
  [kvm="$enableval"],
  [kvm="yes"])

AM_CONDITIONAL( [WANT_KVM], [test x"$kvm" = x"yes"])

AC_ARG_WITH(
  [mirror-http-proxy],
  [AS_HELP_STRING(
    [--with-mirror-http-proxy=URL],
    [URL to the mirror HTTP proxy (default: not set (no mirror)).
     The proxy configuration is then used during both the netinstall
     installation and after as well (it's added to /etc/apt/apt.conf).
     The chosen URL should be reachable from QEMU. As an example, if
     you use the apt-cacher-ng default configuration and make it
     listen on localhost, you should use http://10.0.2.2:3142 because
     localhost becomes 10.0.2.2 with the current QEMU configuration
     and because the port 3142 is the default port for apt-cacher-ng.])],
  [MIRROR_HTTP_PROXY=$withval],
  [MIRROR_HTTP_PROXY=])

AC_ARG_WITH(
  [--with-trisquel-target-rootfs-size],
  [AS_HELP_STRING(
    [--trisquel-target-rootfs-size=SIZE],
    [Size of the target image (default=3.5G). The size will be passed
    as-is to the 'qemu-img create' command. See 'man 1 qemu-img' for
    more details.])],
  [TRISQUEL_ROOTFS_SIZE=$withval],
  [TRISQUEL_ROOTFS_SIZE=3.5G]) dnl 3.4G: Fail, 3.5G: OK

AC_ARG_WITH(
  [trisquel-netinstall],
  [AS_HELP_STRING(
    [--with-trisquel-netinstall=PATH],
    [Path to trisquel netinstall image
     (default=trisquel-netinst_11.0.1_amd64.iso). Note that at the moment
     only trisquel-netinst_11.0.1_amd64.iso is supported. If you use
     another image the signature verification will fail.])],
  [TRISQUEL_NETINSTALL=$withval],
  [TRISQUEL_NETINSTALL=trisquel-netinst_11.0.1_amd64.iso])

AC_CHECK_PROG([CHMOD], [chmod], [chmod])
AS_IF([test x"$CHMOD" = x""],
      [AC_MSG_ERROR([chmod was not found in PATH ($PATH)])])

AC_CHECK_PROG([GPG], [gpg], [gpg])
AS_IF([test x"$GPG" = x""],
      [AC_MSG_ERROR([gpg was not found in PATH ($PATH)])])

AC_CHECK_PROG([INSTALL], [install], [install])
AS_IF([test x"$INSTALL" = x""],
      [AC_MSG_ERROR([install was not found in PATH ($PATH)])])

AC_CHECK_PROG([RM], [rm], [rm])
AS_IF([test x"$RM" = x""],
      [AC_MSG_ERROR([rm was not found in PATH ($PATH)])])

AC_CHECK_PROG([XORRISO], [xorriso], [xorriso])
AS_IF([test x"$XORRISO" = x""],
      [AC_MSG_ERROR([xorriso was not found in PATH ($PATH)])])

AC_CHECK_PROG([GRUB_MKRESCUE], [grub-mkrescue], [grub-mkrescue])
AS_IF([test x"$GRUB_MKRESCUE" = x""],
      [AC_MSG_ERROR([grub-mkrescue was not found in PATH ($PATH)])])

AC_CHECK_PROG([DD], [dd], [dd])
AS_IF([test x"$DD" = x""],
      [AC_MSG_ERROR([dd was not found in PATH ($PATH)])])

AC_CHECK_PROG([MKFS_VFAT], [mkfs.vfat], [mkfs.vfat])
AS_IF([test x"$MKFS_VFAT" = x""],
      [AC_MSG_ERROR([mkfs.vfat was not found in PATH ($PATH)])])

AC_CHECK_PROG([MCOPY], [mcopy], [mcopy])
AS_IF([test x"$MCOPY" = x""],
      [AC_MSG_ERROR([mcopy was not found in PATH ($PATH)])])

AC_CHECK_PROG([MV], [mv], [mv])
AS_IF([test x"$MV" = x""],
      [AC_MSG_ERROR([mv was not found in PATH ($PATH)])])

AC_CHECK_PROG([QEMU_IMG], [qemu-img], [qemu-img])
AS_IF([test x"$QEMU_IMG" = x""],
      [AC_MSG_ERROR([qemu-img was not found in PATH ($PATH)])])

AC_CHECK_PROG([QEMU_SYSTEM_X86_64], [qemu-system-x86_64], [qemu-system-x86_64])
AS_IF([test x"$QEMU_SYSTEM_X86_64" = x""],
      [AC_MSG_ERROR([qemu-system-x86_64 was not found in PATH ($PATH)])])

# Check for the netinstall iso file
AS_IF([test x"`echo "$TRISQUEL_NETINSTALL" | cut -c1`" = x"~"],
      [AC_MSG_ERROR([~ not supported in --with-trisquel-netinstall.
                     Use paths without '~'.])])

AC_CHECK_FILE([$TRISQUEL_NETINSTALL],
      [],
      [AC_MSG_ERROR([trisquel-netinst_11.0.1_amd64.iso was not found in
                     $TRISQUEL_NETINSTALL])])

AS_IF([test x"$kvm" = x"yes"],
      [AS_IF([test -c /dev/kvm], [], AC_MSG_ERROR([/dev/kvm not found.]))
       AS_IF([echo quit | qemu-system-x86_64 -display none -vga none -enable-kvm -monitor stdio],
             [],
             [AC_MSG_ERROR([KVM test with qemu-system-x86_64 failed.
                            Check permissions on /dev/kvm.])])])

AC_CONFIG_FILES([Makefile])
AC_OUTPUT

echo
echo "Configuration options:"
echo "======================"
AS_IF([test x"$kvm" = x"yes"],
      [echo "- Kvm: enabled"],
      [echo "- Kvm: disabled"])
echo "- Trisquel netinstall path: $TRISQUEL_NETINSTALL"
echo "- Trisquel target rootfs size: $TRISQUEL_ROOTFS_SIZE"
AS_IF([test x"$MIRROR_HTTP_PROXY" = x""],
      [echo "- Trisquel mirror http proxy: disabled"],
      [echo "- Trisquel mirror http proxy: $MIRROR_HTTP_PROXY"])