grub2/grub2-s390x-04-grub2-install.patch

From: Raymund Will <rw@suse.com>
Subject: Allow s390x-emu to be "installed"
References: fate#314213
Patch-Mainline: no

---
 Makefile.util.def                    |   39 +++
 configure.ac                         |    9 
 grub-core/Makefile.core.def          |    7 
 grub-core/osdep/basic/no_platform.c  |    7 
 grub-core/osdep/unix/platform.c      |   13 +
 grub-core/osdep/windows/platform.c   |    6 
 include/grub/util/install.h          |    4 
 util/grub-install-common.c           |    1 
 util/grub-install.c                  |   51 +++++
 util/s390x/dracut-grub2.sh.in        |   69 ++++++
 util/s390x/dracut-module-setup.sh.in |   17 +
 util/s390x/zipl2grub.conf.in         |   26 ++
 util/s390x/zipl2grub.pl.in           |  346 +++++++++++++++++++++++++++++++++++
 13 files changed, 591 insertions(+), 4 deletions(-)

--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -350,6 +350,7 @@ program = {
   ldadd = grub-core/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
   cppflags = '-DGRUB_SETUP_FUNC=grub_util_bios_setup';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -370,6 +371,7 @@ program = {
   ldadd = grub-core/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
   cppflags = '-DGRUB_SETUP_FUNC=grub_util_sparc_setup';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -385,6 +387,7 @@ program = {
   ldadd = libgrubkern.a;
   ldadd = grub-core/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -415,6 +418,7 @@ program = {
   ldadd = libgrubkern.a;
   ldadd = grub-core/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 data = {
@@ -620,7 +624,7 @@ program = {
   common = grub-core/disk/host.c;
 
   common = util/resolve.c;
-  enable = noemu;
+  emu_condition = COND_s390x;
   common = grub-core/kern/emu/argp_common.c;
   common = grub-core/osdep/init.c;
 
@@ -688,6 +692,38 @@ script = {
 };
 
 script = {
+  name = zipl2grub.pl;
+  common = util/s390x/zipl2grub.pl.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+data = {
+  name = zipl2grub.conf.in;
+  common = util/s390x/zipl2grub.conf.in;
+  installdir = grubconf;
+  enable = emu;
+  emu_condition = COND_s390x;
+};
+
+script = {
+  name = dracut-module-setup.sh;
+  common = util/s390x/dracut-module-setup.sh.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+script = {
+  name = dracut-grub.sh;
+  common = util/s390x/dracut-grub2.sh.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+script = {
   name = grub-mkconfig_lib;
   common = util/grub-mkconfig_lib.in;
   installdir = noinst;
@@ -1281,6 +1317,7 @@ program = {
   ldadd = libgrubkern.a;
   ldadd = grub-core/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
--- a/configure.ac
+++ b/configure.ac
@@ -177,9 +177,9 @@ if test x$platform != xemu ; then
    esac
 fi
 
-if test x"$target_cpu-$platform" = xsparc64-emu ; then
-   target_m64=1 ;
-fi
+case x"$target_cpu-$platform" in
+    xsparc64-emu | xs390x-emu) target_m64=1 ;;
+esac
 
 case "$target_os" in
   windows* | mingw32*) target_os=cygwin ;;
@@ -1665,6 +1665,9 @@ AM_CONDITIONAL([COND_arm_uboot], [test x
 AM_CONDITIONAL([COND_arm_efi], [test x$target_cpu = xarm -a x$platform = xefi])
 AM_CONDITIONAL([COND_arm64], [test x$target_cpu = xarm64 ])
 AM_CONDITIONAL([COND_arm64_efi], [test x$target_cpu = xarm64 -a x$platform = xefi])
+AM_CONDITIONAL([COND_s390x], [test x$target_cpu = xs390x ])
+AM_CONDITIONAL([COND_NOT_s390x], [test x$target_cpu != xs390x ])
+AM_CONDITIONAL([COND_s390x_emu], [test x$target_cpu = xs390x -a x$platform = xemu])
 
 AM_CONDITIONAL([COND_HOST_HURD], [test x$host_kernel = xhurd])
 AM_CONDITIONAL([COND_HOST_LINUX], [test x$host_kernel = xlinux])
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1064,6 +1064,7 @@ module = {
 module = {
   name = videotest;
   common = commands/videotest.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -1477,6 +1478,7 @@ module = {
   common = gfxmenu/gui_progress_bar.c;
   common = gfxmenu/gui_util.c;
   common = gfxmenu/gui_string_util.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -1856,11 +1858,13 @@ module = {
   name = gfxterm;
   common = term/gfxterm.c;
   enable = videomodules;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
   name = gfxterm_background;
   common = term/gfxterm_background.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -1975,6 +1979,7 @@ module = {
   enable = x86_64_efi;
   enable = emu;
   enable = xen;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -1990,6 +1995,7 @@ module = {
 module = {
   name = gfxterm_menu;
   common = tests/gfxterm_menu.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -2142,6 +2148,7 @@ module = {
   enable = x86_64_efi;
   enable = emu;
   enable = xen;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
--- a/grub-core/osdep/basic/no_platform.c
+++ b/grub-core/osdep/basic/no_platform.c
@@ -44,3 +44,10 @@ grub_install_sgi_setup (const char *inst
 {
   grub_util_error ("%s", _("no SGI routines are available for your platform"));
 }
+
+void
+grub_install_zipl (const char *D, const char *s, const char *d, int i, int f)
+{
+  grub_util_error ("%s", _("no zIPL routines are available for your platform"));
+}
+
--- a/grub-core/osdep/unix/platform.c
+++ b/grub-core/osdep/unix/platform.c
@@ -233,3 +233,16 @@ grub_install_sgi_setup (const char *inst
 	imgfile, destname, NULL });
   grub_util_warn ("%s", _("You will have to set `SystemPartition' and `OSLoader' manually."));
 }
+
+void
+grub_install_zipl (const char *scriptdir, const char *script,
+		   const char *dest, int install, int force)
+{
+  char *path = grub_util_path_concat (2, scriptdir, script);
+  if (grub_util_exec ((const char * []){ path,
+	install ? "" : "--debug",
+        verbosity ? "-v" : "",
+	force ? "--force" : "",
+	"-z", dest, NULL }))
+    grub_util_error (_("`%s' failed.\n"), script);
+}
--- a/grub-core/osdep/windows/platform.c
+++ b/grub-core/osdep/windows/platform.c
@@ -422,3 +422,9 @@ grub_install_sgi_setup (const char *inst
 {
   grub_util_error ("%s", _("no SGI routines are available for your platform"));
 }
+
+void
+grub_install_zipl (const char *D, const char *s, const char *d, int i, int f)
+{
+  grub_util_error ("%s", _("no zIPL routines are available for your platform"));
+}
--- a/include/grub/util/install.h
+++ b/include/grub/util/install.h
@@ -99,6 +99,7 @@ enum grub_install_plat
     GRUB_INSTALL_PLATFORM_I386_XEN,
     GRUB_INSTALL_PLATFORM_X86_64_XEN,
     GRUB_INSTALL_PLATFORM_ARM64_EFI,
+    GRUB_INSTALL_PLATFORM_S390X_EMU,
     GRUB_INSTALL_PLATFORM_MAX
   };
 
@@ -217,6 +218,9 @@ void
 grub_install_sgi_setup (const char *install_device,
 			const char *imgfile, const char *destname);
 
+void
+grub_install_zipl (const char *D, const char *s, const char *d, int i, int f);
+
 int 
 grub_install_compress_gzip (const char *src, const char *dest);
 int 
--- a/util/grub-install-common.c
+++ b/util/grub-install-common.c
@@ -665,6 +665,7 @@ static struct
     [GRUB_INSTALL_PLATFORM_ARM_EFI] =          { "arm",     "efi"       },
     [GRUB_INSTALL_PLATFORM_ARM64_EFI] =        { "arm64",   "efi"       },
     [GRUB_INSTALL_PLATFORM_ARM_UBOOT] =        { "arm",     "uboot"     },
+    [GRUB_INSTALL_PLATFORM_S390X_EMU] =        { "s390x",   "emu"       },
   }; 
 
 char *
--- a/util/grub-install.c
+++ b/util/grub-install.c
@@ -66,6 +66,7 @@ static int force_file_id = 0;
 static char *disk_module = NULL;
 static char *efidir = NULL;
 static char *macppcdir = NULL;
+static char *zipldir = NULL;
 static int force = 0;
 static int have_abstractions = 0;
 static int have_cryptodisk = 0;
@@ -107,6 +108,7 @@ enum
     OPTION_NO_BOOTSECTOR,
     OPTION_NO_RS_CODES,
     OPTION_MACPPC_DIRECTORY,
+    OPTION_ZIPL_DIRECTORY,
     OPTION_LABEL_FONT,
     OPTION_LABEL_COLOR,
     OPTION_LABEL_BGCOLOR,
@@ -182,6 +184,11 @@ argp_parser (int key, char *arg, struct
       efidir = xstrdup (arg);
       return 0;
 
+    case OPTION_ZIPL_DIRECTORY:
+      free (zipldir);
+      zipldir = xstrdup (arg);
+      return 0;
+
     case OPTION_DISK_MODULE:
       free (disk_module);
       disk_module = xstrdup (arg);
@@ -299,6 +306,8 @@ static struct argp_option options[] = {
    N_("use DIR as the EFI System Partition root."), 2},
   {"macppc-directory", OPTION_MACPPC_DIRECTORY, N_("DIR"), 0,
    N_("use DIR for PPC MAC install."), 2},
+  {"zipl-directory", OPTION_ZIPL_DIRECTORY, N_("DIR"), 0,
+   N_("use DIR as the zIPL Boot Partition root."), 2},
   {"label-font", OPTION_LABEL_FONT, N_("FILE"), 0, N_("use FILE as font for label"), 2},
   {"label-color", OPTION_LABEL_COLOR, N_("COLOR"), 0, N_("use COLOR for label"), 2},
   {"label-bgcolor", OPTION_LABEL_BGCOLOR, N_("COLOR"), 0, N_("use COLOR for label background"), 2},
@@ -325,6 +334,8 @@ get_default_platform (void)
    return "arm64-efi";
 #elif defined (__amd64__) || defined (__x86_64__) || defined (__i386__)
    return grub_install_get_default_x86_platform ();
+#elif defined (__s390x__)
+   return "s390x-emu";
 #else
    return NULL;
 #endif
@@ -484,6 +495,8 @@ have_bootdev (enum grub_install_plat pl)
 
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
+
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       return 0;
 
       /* pacify warning.  */
@@ -895,6 +908,7 @@ main (int argc, char *argv[])
     case GRUB_INSTALL_PLATFORM_ARM_UBOOT:
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       break;
 
     case GRUB_INSTALL_PLATFORM_I386_QEMU:
@@ -940,6 +954,7 @@ main (int argc, char *argv[])
     case GRUB_INSTALL_PLATFORM_MIPS_QEMU_MIPS:
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       free (install_device);
       install_device = NULL;
       break;
@@ -1201,6 +1216,20 @@ main (int argc, char *argv[])
 	}
     }
 
+  if (platform == GRUB_INSTALL_PLATFORM_S390X_EMU)
+    {
+      if (!zipldir)
+	{
+	  char *d = grub_util_path_concat (2, bootdir, "zipl");
+	  if (!grub_util_is_directory (d))
+	    {
+	      free (d);
+	      grub_util_error ("%s", _("cannot find zIPL directory"));
+	    }
+	  zipldir = d;
+	}
+    }
+
   grub_install_copy_files (grub_install_source_directory,
 			   grubdir, platform);
 
@@ -1445,6 +1474,7 @@ main (int argc, char *argv[])
 		  case GRUB_INSTALL_PLATFORM_ARM_UBOOT:
 		  case GRUB_INSTALL_PLATFORM_I386_XEN:
 		  case GRUB_INSTALL_PLATFORM_X86_64_XEN:
+		  case GRUB_INSTALL_PLATFORM_S390X_EMU:
 		    grub_util_warn ("%s", _("no hints available for your platform. Expect reduced performance"));
 		    break;
 		    /* pacify warning.  */
@@ -1557,6 +1587,10 @@ main (int argc, char *argv[])
       strcpy (mkimage_target, "sparc64-ieee1275-raw");
       core_name = "core.img";
       break;
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+      strcpy (mkimage_target, "grub2-emu");
+      core_name = mkimage_target;
+      break;
       /* pacify warning.  */
     case GRUB_INSTALL_PLATFORM_MAX:
       break;
@@ -1572,6 +1606,7 @@ main (int argc, char *argv[])
 				       core_name);
   char *prefix = xasprintf ("%s%s", prefix_drive ? : "",
 			    relative_grubdir);
+  if (core_name != mkimage_target)
   grub_install_make_image_wrap (/* source dir  */ grub_install_source_directory,
 				/*prefix */ prefix,
 				/* output */ imgfile,
@@ -1610,6 +1645,17 @@ main (int argc, char *argv[])
 				       /* image target */ mkimage_target, 0);
       }
       break;
+
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+#if 0
+      {
+	char *dst = grub_util_path_concat (2, platdir, "grub2-emu");
+	grub_install_copy_file ("/usr/bin/grub2-emu", dst, 1);
+	free (dst);
+      }
+#endif
+      break;
+
     case GRUB_INSTALL_PLATFORM_ARM_EFI:
     case GRUB_INSTALL_PLATFORM_ARM64_EFI:
     case GRUB_INSTALL_PLATFORM_IA64_EFI:
@@ -1871,6 +1917,11 @@ main (int argc, char *argv[])
 	}
       break;
 
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+      grub_install_zipl (grub_install_source_directory, "zipl2grub.pl",
+			 zipldir, install_bootsector, force);
+      break;
+
     case GRUB_INSTALL_PLATFORM_MIPSEL_LOONGSON:
     case GRUB_INSTALL_PLATFORM_MIPSEL_QEMU_MIPS:
     case GRUB_INSTALL_PLATFORM_MIPS_QEMU_MIPS:
--- /dev/null
+++ b/util/s390x/dracut-grub2.sh.in
@@ -0,0 +1,69 @@
+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+#getargbool() { true; }
+
+if getargbool 0 initgrub && [ ! -e /grub2b0rken ] || [ -e /grub2force ]; then
+  #type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+  checkro() {
+   local dev mp fs opts dc
+   local rofs=false
+   while read dev mp fs opts dc; do
+     [ "$mp" = "/sysroot" ] || continue
+     case ",$opts," in
+     (*,ro,*) rofs=true;;
+     esac
+   done < /proc/mounts
+   echo $rofs
+  }
+  checkd() {
+    [ -d $1 ] && echo true || echo false
+  }
+  getterm() {
+    local term="$(getarg TERM)"
+    [ -z "$term" ] && term=dumb
+    echo $term
+  }
+
+  exec_prefix=@exec_prefix@
+  bindir=@bindir@
+  if [ -e /sysroot$bindir/grub2-emu ]; then
+
+
+    export TERM=$(getterm)
+    export grub2rofs=$(checkro)
+    export grub2sysfs=$(checkd /sysroot/sys/kernel)
+    export grub2procfs=$(checkd /sysroot/proc/slef)
+    export -p > /tmp/grub2env
+    cat /proc/mounts > /tmp/grub2mounts
+
+        _ctty="$(RD_DEBUG= getarg rd.ctty=)" && _ctty="/dev/${_ctty##*/}"
+        if [ -z "$_ctty" ]; then
+            _ctty=console
+            while [ -f /sys/class/tty/$_ctty/active ]; do
+                _ctty=$(cat /sys/class/tty/$_ctty/active)
+                _ctty=${_ctty##* } # last one in the list
+            done
+            _ctty=/dev/$_ctty
+        fi
+        [ -c "$_ctty" ] || _ctty=/dev/tty1
+        case "$(/usr/bin/setsid --help 2>&1)" in *--ctty*) CTTY="--ctty";; esac
+
+    CTTY="$CTTY --wait"
+    $grub2rofs || mount -o remount,ro /sysroot
+    $grub2sysfs || mount --bind {,/sysroot}/sys
+    $grub2procfs || mount --bind {,/sysroot}/proc
+
+    info "Trying grub2emu (ro=$grub2rofs, TERM=$TERM)..."
+    setsid $CTTY -- chroot /sysroot $bindir/grub2-emu -X -X 0<>$_ctty 1>&0 2>&0
+    if [ -e /grub2force ] && [  $(cat /sys/kernel/kexec_loaded) = 1 ]; then
+      systemctl kexec
+    fi
+    $grub2procfs || umount /sysroot/proc
+    $grub2sysfs || umount /sysroot/sys
+    $grub2rofs || mount -o remount,rw /sysroot
+  else
+    info "No $bindir/grub2-emu in /sysroot--trying to proceed without kexec..."
+  fi
+fi
+
--- /dev/null
+++ b/util/s390x/dracut-module-setup.sh.in
@@ -0,0 +1,17 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+# called by dracut
+check() {
+    local _arch=$(uname -m)
+    [ "$_arch" = "s390" -o "$_arch" = "s390x" ] || return 1
+    return 0
+}
+
+# called by dracut
+install() {
+    inst_hook cleanup 99 "$moddir/grub2.sh"
+    #inst_multiple grub2-emu kexec
+}
+
--- /dev/null
+++ b/util/s390x/zipl2grub.conf.in
@@ -0,0 +1,26 @@
+## This is the template for '@zipldir@/config' and is subject to
+## rpm's %config file handling in case of grub2-s390x-emu package update.
+
+[defaultboot]
+defaultmenu = menu
+
+[grub2]
+    target = @zipldir@
+    ramdisk = @zipldir@/initrd,0x2000000
+    image = @zipldir@/image
+    parameters = "root=@GRUB_DEVICE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ initgrub quiet splash=silent "
+
+[skip-grub2]
+    target = @zipldir@
+    ramdisk = @zipldir@/initrd,0x2000000
+    image = @zipldir@/image
+    parameters = "root=@GRUB_DEVICE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ "
+
+:menu
+    target = @zipldir@
+    timeout = 16
+    default = 1
+    prompt = 1
+    1 = grub2
+    2 = skip-grub2
+
--- /dev/null
+++ b/util/s390x/zipl2grub.pl.in
@@ -0,0 +1,346 @@
+#!/usr/bin/perl
+use strict;
+
+my $C = $0; $C =~ s{^.*/}{};
+
+my $in = '@sysconfdir@/default/zipl2grub.conf.in';
+my $default = '@sysconfdir@/default/grub';
+my $fallback = '@sysconfdir@/zipl.conf';
+my $sysconfbl = '@sysconfdir@/sysconfig/bootloader';
+my $zipldir = "";
+my $running = "";
+my $refresh = 1; # needs to default to "on" until most bugs are shaken out!
+my $force = 0;
+my $verbose = 0;
+my $debug = 0;
+my $miss = 0;
+my $cfg = "";
+my %C;
+
+$C{GRUB_CMDLINE_LINUX} = "";  # force existence!
+
+sub Panic($$) {
+  printf( STDERR "%s", $_[1]);
+  exit( $_[0]);
+}
+sub Info($$) {
+  printf( STDERR "%s", $_[1]) if ($_[0] <= $verbose);
+}
+sub System(@) {
+  my (@C) =@_;
+  Info( 1, "+ " . join( " ", @C) . "\n");
+  return 0 if ($debug);
+  system( @C);
+  if ($? == -1) {
+    Panic( $?, "$C[0]: Failed to execute: $!\n");
+  } elsif ($? & 127) {
+    Panic( $?, sprintf( "$C[0]: Died with signal %d with%s coredump\n",
+           ($? & 127),  ($? & 128) ? '' : 'out'));
+  } elsif ( $? >> 8 != 0 ) {
+    Panic( $?, "$C[0]: Failed\n");
+  }
+  return( 0);
+}
+sub cp($$) {
+  my @C = ( "cp", "-p", $_[0], $_[1]);
+  System( @C);
+}
+sub rm($) {
+  return( 0) unless ( -l $_[0] || -e $_[0]);
+  Info( 2, "+ rm $_[0]\n");
+  return 0 if ($debug);
+  unlink( $_[0]) || Panic( 1, "$C: unlink: $!.\n");
+}
+sub mv($$) {
+  Info( 1, "+ mv $_[0] $_[1]\n");
+  return 0 if ($debug);
+  rename($_[0], $_[1]) || Panic( 1, "$C: rename: $!.\n");
+}
+sub ln($$) {
+  Info( 1, "+ ln -sf $_[0] $_[1]\n");
+  return 0 if ($debug);
+  rm( $_[1]);
+  symlink($_[0], $_[1]) || Panic( 1, "$C: symlink: $!.\n");
+}
+sub BootCopy($$$) {
+  my( $file, $dir, $tgt) = @_;
+  my $curr = "$dir/$tgt";
+  my $prev = "$dir/$tgt.prev";
+  Info(4, "Copy /boot/$file $dir $tgt\n");
+  if ( -l $curr ) {
+    my $curf = readlink( $curr);
+    if ( $curf ne $file ) {
+      if ( -l $prev ) {
+	my $pref = readlink( $prev);
+	rm( $pref);
+      }
+      mv( $curr, $prev);
+    }
+  }
+  cp( "/boot/$file", "$dir/$file");
+  ln( $file, $curr);
+}
+sub MkInitrd($$$) {
+  my( $initrd, $dir, $version) = @_;
+  my @C = ( "dracut", "--hostonly", "--force", "$dir/$initrd", $version);
+  System( @C);
+  ln( $initrd, "$dir/initrd");
+}
+sub ChkInitrd($$) {
+  my( $dir, $initrd) = @_;
+  my $found = 0;
+  my $d = $dir;
+  my $pattern = qr{lib/dracut/hooks/cleanup/99-grub2.sh};
+  my $show = "cleanup/99-grub2.sh";
+
+  return $found unless (-r "$dir/$initrd");
+
+  my $modinst = "/usr/lib/dracut/modules.d/99grub2/module-setup.sh";
+  if ( -r $modinst ) {
+    my( $hook, $ord, $script);
+    my $pat = qr{^\s*inst_hook\s+(\S+)\s+([0-9]+)\s+\"\$moddir/(grub2\.sh)\"};
+    open( IN, "< $modinst") || die;
+    while ( <IN> ) {
+      next unless ($_ =~ $pat);
+      $show = "$1/$2-$3";
+      $pattern = qr{lib/dracut/hooks/$show}o;
+      last;
+    }
+    close( IN);
+  }
+
+  Info( 3, "+ zcat $d/$initrd | cpio -it | grep '$show'\n");
+  open( IN, "zcat $d/$initrd | cpio -it 2>/dev/null |") ||
+     Panic( 1, "$C: cpio: $!.\n");
+  while ( <IN> ) {
+    $found = 1 if ($_ =~ $pattern);
+  }
+  close( IN);
+  return $found;
+}
+
+sub Usage($) {
+  my @cat = ("",
+	"Parameter error.",
+	"zIPL directory missing.",
+	"Configuration template missing.",
+	"Configuration template unreadable.",
+	"zIPL directory not accesible.",
+	""
+  );
+  my $msg = "";
+
+  $msg .= sprintf( "%s: %s\n", $C, $cat[$_[0]]) if ($_[0] > 0);
+  $msg .= "Usage: $C [-v] [-d] [-f] [-T template] [-z ZIPLDIR]\n";
+  Panic( $_[0], $msg . "\n");
+}
+
+die if ($[ != 0);
+while ( $#ARGV >= 0 ) {
+  $_ = shift;
+  next if /^$/;
+  last if /^--$/;
+  (/^--verbose$/ || /^-v$/)   && ($verbose++, next);
+  (/^--quiet$/ || /^-q$/)     && ($verbose = 0, next);
+  (/^--debug$/ || /^-d$/)     && ($debug = 1, $verbose++, next);
+  (/^--force$/ || /^-f$/)     && ($force = $refresh = 1, next);
+  (/^--refresh$/ || /^-r$/)   && ($refresh = 1, next);
+  (/^--keep$/ || /^-k$/)      && ($refresh = 0, next);
+  (/^--?help/ || /^-h/)       && (Usage(0));
+  (/^--zipldir$/ || /^-z$/)   && ($zipldir = shift || Usage(2), next);
+  (/^--template$/ || /^-T$/)  && ($in = shift || Usage(3), next);
+  (/^-/)                      && (Usage(1));
+  Usage(1);
+}
+Usage(4) if (! -r $in);
+
+if ($zipldir) {
+  $C{zipldir} = $zipldir;  # command-line wins
+} elsif ( exists( $C{zipldir}) ) {
+  $zipldir = $C{zipldir};  # otherwise fall back to config
+} else {
+  $zipldir = $C{zipldir} = "/boot/zipl"; # but don't proceed without...
+}
+Usage(5) if (! -d $zipldir);
+if ( $zipldir eq "/boot" ) {
+  Panic( 5, "$C: zIPL directory '/boot' not supported!\n");
+}
+
+if ( ! -r $default && ! -r $fallback && ! -r $sysconfbl ) {
+  Panic( 0, "$C: No configuration files found. Retry later!\n");
+}
+if ( -r $default ) {
+  open( IN, "< $default") || die;
+  while ( <IN> ) {
+    chomp;
+    s{^\s*#.*$}{};
+    next if m{^\s*$};
+    s{x}{\x01xx\x01}g;
+    s{\\\"}{\x01x1\x01}g;
+    s{\\\'}{\x01x2\x01}g;
+    Info( 5, "<$_>\n");
+    if ( m{^([^\s=]+)='([^']*)'\s*(?:#.*)?$} ||
+         m{^([^\s=]+)="([^"]*)"\s*(?:#.*)?$} ||
+         m{^([^\s=]+)=(\S*)\s*(?:#.*)?$} ) {
+      my ( $k, $v) = ($1, $2);
+      $v =~ s{\x01x2\x01}{\\'}g;
+      $v =~ s{\x01x1\x01}{\\"}g;
+      $v =~ s{\x01xx\x01}{x}g;
+      $C{$k} = $v;
+      next;
+    }
+    print( STDERR "$default:$.: parse error ignored.\n");
+  }
+  close( IN);
+}
+
+if ( ! exists( $C{GRUB_DEVICE}) &&
+     (! exists( $C{GRUB_CMDLINE_LINUX_DEFAULT}) ||
+      $C{GRUB_CMDLINE_LINUX_DEFAULT} eq "quiet splash=silent") &&
+     -r $fallback ) {
+  # configuration incomplete, let's try fallback
+    open( IN, "< $fallback") || die;
+    my $section = "";
+    while( <IN> ){
+      if ( m{^\[([^\]]+)\]\s*$} ) {
+        $section = $1;
+      }
+      if ( $section eq "ipl" &&
+	   m{^\s*parameters\s*=\s*\"root=(\S+)(?:\s*|\s+([^\"]+))\"} ) {
+        $C{GRUB_DEVICE} = $1;
+        $C{GRUB_CMDLINE_LINUX_DEFAULT} = $2 if (defined($2) && $2 !~ m{^\s*$});
+        last;
+      }
+    }
+    close( IN);
+    $default = $fallback;
+}
+if ( ! exists( $C{GRUB_DEVICE}) ) {
+  my( $dev, $uuid, $type, $subvol) = ("", "", "", "");
+  chomp( $dev  = qx{grub2-probe --target=device /});
+  chomp( $uuid = qx{grub2-probe --device $dev --target=fs_uuid});
+  $subvol =~ s{^/}{};
+  if ($dev && $uuid) {
+    $C{GRUB_DEVICE} = "UUID=$uuid";
+    chomp( $type = qx{stat -f --printf='%T' /});
+    chomp( $subvol = qx{grub2-mkrelpath /}) if ( $type eq "btrfs" );
+    $C{GRUB_DEVICE} .= " rootflags=subvol=$subvol" if ($subvol);
+  }
+}
+if ( ! exists( $C{GRUB_DEVICE}) && -r "/etc/fstab" ) {
+  my( $dev, $type);
+  open( IN, "< /etc/fstab") || die;
+  while ( <IN> ) {
+    next if ( m{^\s*#} );
+    ($dev, $type) = (m{^(\S+)\s+/\s+(\S+)\s+\S+\s+\S+\s+\S+\s*(?:#.*)?$});
+    last if (defined( $dev));
+  }
+  close( IN);
+  $C{GRUB_DEVICE} = $dev;
+  # ToDo: is static 'subvol=@' good enough?
+  $C{GRUB_DEVICE} .= ' rootflags=subvol=@' if ($type eq "btrfs");
+}
+if ( (! exists( $C{GRUB_CMDLINE_LINUX_DEFAULT}) ||
+      $C{GRUB_CMDLINE_LINUX_DEFAULT} eq "quiet splash=silent") &&
+      -r $sysconfbl) {
+  open( IN, "< $sysconfbl") ||  die;
+  while ( <IN> ) {
+    next if ( m{^\s*#} );
+    if ( m{^DEFAULT_APPEND=".*"(?:\s*|\s+#.*)$} ) {
+      $C{GRUB_CMDLINE_LINUX_DEFAULT} = $1;
+    }
+  }
+  close( IN);
+}
+
+  if ( ! exists( $C{GRUB_DEVICE})) {
+    Panic( 0, "$C: Default not ready and no fallback.  Please retry later!\n");
+  }
+
+if ( $debug && $verbose > 2 ) {
+  foreach ( sort( keys( %C)) ) {
+    printf( "%s=\"%s\"\n", $_, $C{$_});
+  }
+}
+
+open( IN, "< $in") ||
+   Panic( 1, "$C: Failed to open 'zipl.conf' template: $!.\n");
+while ( <IN> ) {
+  Info( 3, "$.. <$_$.. >");
+  if ( $. == 1 && m{^## This} ) {
+    $_ = "## This file was written by 'grub2-install/$C'\n" .
+	 "## filling '$in' as template\n";
+  } elsif ( $. == 2 && m{^## rpm's} ) {
+    $_ = "## with values from '$default'.\n" .
+	 "## In-place modifications will eventually go missing!\n";
+  }
+  while ( m{\@([^\@\s]+)\@} ) {
+    my $k = $1;
+    my $v;
+    if ( exists( $C{$k}) ) {
+      $v = $C{$k};
+    } else {
+      $v =  $k;
+      $miss++;
+    }
+    s{\@$k\@}{$v}g;
+  }
+  Info( 2, $_);
+  $cfg .= $_;
+}
+if ( $miss ) {
+  Info( 1, "Partially filled config:\n===\n$cfg===\n");
+  Panic( 1, "$C: 'zipl.conf' template could not be filled. \n");
+}
+
+my $ziplconf = "$zipldir/config";
+if ( ! $debug ) {
+  open( OUT, "> $ziplconf") || die;
+  print( OUT $cfg) || die;
+  close( OUT);
+}
+
+# copy out kernel and initrd
+my $defimage = "/boot/image";
+my $definitrd = "/boot/initrd";
+my $ziplimage = "$zipldir/image";
+my $ziplinitrd = "$zipldir/initrd";
+my $Image = "$defimage";
+
+if ( ! $running && ! $force ) {
+  chomp( $running = qx{uname -r});
+  Info( 1, "preferred kernel: '$running'\n");
+  $Image .= "-$running";
+}
+if ( ! -r $Image ) {
+  $Image = $defimage;
+}
+Panic( 1, "$C: kernel '$Image' not readable!?\n") unless (-r $Image);
+
+if ( -l $Image ) {
+  $Image = readlink( $Image);
+}
+my ($image, $version) = ($Image =~ m{^(?:/boot/)?([^-]+-(.+))$});
+my $initrd = "initrd-$version";
+
+if ( !defined($image) || !defined($version) || ! -r "/boot/$image" ) {
+  Panic( 1, "$C: weird $Image. This should never happen!\n");
+}
+
+if ( ! -r $ziplimage || ! -r $ziplinitrd || $refresh ) {
+  BootCopy( $image, $zipldir, "image");
+  BootCopy( $initrd, $zipldir, "initrd") if (-r "/boot/$initrd");
+}
+if ( ! ChkInitrd( $zipldir, "initrd")) {
+  MkInitrd( $initrd, $zipldir, $version);
+}
+if ( ! ChkInitrd( $zipldir, "initrd")) {
+  Info( 0, "$C: dracut does not work as expected! Help needed!\n");
+  $miss++;
+}
+
+# now: go for it!
+my @C = ( "/sbin/zipl", (($verbose) ? "-Vnc" : "-nc"), "$ziplconf" );
+System( @C);
+exit( $miss);
+