Supermin appliance.

[febootstrap.git] / febootstrap-supermin-helper.sh

diff --git a/febootstrap-supermin-helper.sh b/febootstrap-supermin-helper.sh
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+#!/bin/bash -
+# febootstrap-supermin-helper
+# (C) Copyright 2009 Red Hat Inc.
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+# Written by Richard W.M. Jones <rjones@redhat.com>
+
+unset CDPATH
+
+TEMP=`getopt \
+        -o '' \
+        --long help,kmods: \
+        -n febootstrap-supermin-helper -- "$@"`
+if [ $? != 0 ]; then
+    echo "febootstrap-supermin-helper: problem parsing the command line arguments"
+    exit 1
+fi
+eval set -- "$TEMP"
+
+usage ()
+{
+    echo "Usage: febootstrap-supermin-helper supermin.img hostfiles.txt kernel initrd"
+    echo "Please read febootstrap-supermin-helper(8) man page for more information."
+}
+
+kmods=""
+
+while true; do
+    case "$1" in
+       --help)
+           usage
+           exit 0;;
+       --kmods)
+           kmods=$2
+           shift 2;;
+       --)
+           shift
+           break;;
+       *)
+           echo "Internal error!"
+           exit 1;;
+    esac
+done
+
+if [ $# -ne 4 ]; then
+    usage
+    exit 1
+fi
+
+set -e
+
+# Input files.
+supermin="$1"
+hostfiles="$2"
+
+# Output files.
+kernel="$3"
+initrd="$4"
+
+rm -f "$kernel" "$initrd"
+
+# Kernel:
+# Look for the most recent kernel named vmlinuz-*.<arch>* which has a
+# corresponding directory in /lib/modules/. If the architecture is x86, look
+# for any x86 kernel.
+#
+# RHEL 5 didn't append the arch to the kernel name, so look for kernels
+# without arch second.
+
+arch=$(echo "@host_cpu@" | sed 's/^i.86$/i?86/')
+kernels=$(ls -1vr /boot/vmlinuz-*.$arch* 2>/dev/null | grep -v xen; ls -1vr /boot/vmlinuz-* 2>/dev/null | grep -v xen)
+for f in $kernels; do
+    b=$(basename "$f")
+    b=$(echo "$b" | sed 's,vmlinuz-,,')
+    modpath="/lib/modules/$b"
+    if [ -d "$modpath" ]; then
+        ln -sf "$f" "$kernel"
+        break
+    fi
+    modpath=
+done
+
+if [ -z "$modpath" ]; then
+    echo "$0: failed to find a suitable kernel" >&2
+    exit 1
+fi
+
+# The initrd consists of these components:
+# (1) The base skeleton appliance that we constructed at build time.
+#     format = plain cpio (could be compressed cpio)
+# (2) The modules from modpath which are on the module whitelist.
+#     format = plain cpio
+# (3) The host files which match wildcards in hostfiles.
+#     format = plain cpio
+
+cp "$supermin" "$initrd" ;# (1)
+
+# Kernel modules (2).
+
+if [ -n "$kmods" ]; then
+    exec 5<"$kmods"
+    whitelist=
+    while read kmod 0<&5; do
+       whitelist="$whitelist -o -name $kmod"
+    done
+    exec 5<&-
+else
+    whitelist="-o -name *.ko"
+fi
+
+find "$modpath" \( -not -name '*.ko' $whitelist \) -a -print0 |
+  cpio --quiet -o -0 -H newc >> "$initrd"
+
+# Host files (3).
+
+hostfiles=$(readlink -f "$hostfiles")
+(cd / &&
+    ls -1df $(cat "$hostfiles") 2>/dev/null |
+    cpio --quiet -o -H newc ) >> "$initrd"