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#!/bin/bash
#
# Create an initrd directory if one does not already exist.
#
# 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, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (C) IBM Corporation, 2013
#
# Author: Connor Shu <Connor.Shu@ibm.com>
D=tools/testing/selftests/rcutorture
# Prerequisite checks
[ -z "$D" ] && echo >&2 "No argument supplied" && exit 1
if [ ! -d "$D" ]; then
echo >&2 "$D does not exist: Malformed kernel source tree?"
exit 1
fi
if [ -d "$D/initrd" ]; then
echo "$D/initrd already exists, no need to create it"
exit 0
fi
T=${TMPDIR-/tmp}/mkinitrd.sh.$$
trap 'rm -rf $T' 0 2
mkdir $T
cat > $T/init << '__EOF___'
#!/bin/sh
while :
do
sleep 1000000
done
__EOF___
# Try using dracut to create initrd
if command -v dracut >/dev/null 2>&1
then
echo Creating $D/initrd using dracut.
# Filesystem creation
dracut --force --no-hostonly --no-hostonly-cmdline --module "base" $T/initramfs.img
cd $D
mkdir initrd
cd initrd
zcat $T/initramfs.img | cpio -id
cp $T/init init
chmod +x init
echo Done creating $D/initrd using dracut
exit 0
fi
# No dracut, so create a C-language initrd/init program and statically
# link it. This results in a very small initrd, but might be a bit less
# future-proof than dracut.
echo "Could not find dracut, attempting C initrd"
cd $D
mkdir initrd
cd initrd
cat > init.c << '___EOF___'
#include <unistd.h>
int main(int argc, int argv[])
{
for (;;)
sleep(1000*1000*1000); /* One gigasecond is ~30 years. */
return 0;
}
___EOF___
gcc -static -Os -o init init.c
strip init
rm init.c
echo "Done creating a statically linked C-language initrd"
exit 0
|
