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#!/bin/sh -
# Before running, make sure 'vmlinuz' in this examples directory is a
# bootable Linux kernel or a symlink to one. You can just use any
# kernel out of the /boot directory for this.
#
# eg:
# cd examples
# ln -s /boot/vmlinuz-NNN vmlinuz
# This creates a very minimal filesystem, just containing bash and a
# few command line utilities. One of the joys of Fedora is that even
# this minimal install is still 200 MB ...
if [ $(id -u) -eq 0 ]; then
echo "Don't run this script as root. Read instructions in script first."
exit 1
fi
if [ ! -e vmlinuz ]; then
echo "Read instructions in script first."
exit 1
fi
../febootstrap -i bash -i coreutils fedora-10 ./minimal $1
# ... but let's minimize it aggressively.
echo -n "Before minimization: "; du -sh minimal
../febootstrap-minimize --all --pack-executables ./minimal
echo -n "After minimization: "; du -sh minimal
# Create the /init which is just a simple script to give users an
# interactive shell.
( cd minimal && cat > init <<'__EOF__'
#!/bin/sh
echo; echo; echo
echo "Welcome to the minimal filesystem example"
echo; echo; echo
/bin/bash -i
__EOF__
chmod +x init
)
# Convert the filesystem to an initrd image.
../febootstrap-to-initramfs ./minimal > minimal-initrd.img
# This is needed because of crappiness with qemu.
rm -f zero
dd if=/dev/zero of=zero bs=2048 count=1
# Now run qemu to boot this minimal system.
qemu-system-$(arch) \
-m 128 \
-kernel vmlinuz -initrd minimal-initrd.img \
-hda zero -boot c
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