1 files changed, 82 insertions, 0 deletions
diff --git a/vagrant/build_linux.sh b/vagrant/build_linux.sh
new file mode 100755
index 0000000..4f53762
--- /dev/null
+++ b/vagrant/build_linux.sh
@@ -0,0 +1,82 @@
+#!/usr/bin/sh
+set -e
+
+BUSY_BOX_VERSION="1.35.0"
+KERNEL_VERSION="v5.10"
+BUILD_BASE=$(pwd)/kernel-dev
+INITRAMFS_BASE=$(pwd)/kernel-dev/initramfs
+
+# wont run wihtout static busybox. the install target should be static too.
+mkdir -p ./kernel-dev/busybox
+cd ./kernel-dev/busybox &&\
+  wget https://www.busybox.net/downloads/busybox-$BUSY_BOX_VERSION.tar.bz2 &&\
+  tar -xvf busybox-$BUSY_BOX_VERSION.tar.bz2
+cd busybox-$BUSY_BOX_VERSION &&\
+  make defconfig &&\
+  LD_FLAGS="--static" make -j4 && make install
+
+cd "$BUILD_BASE" &&\
+  git clone --depth=1 --branch ${KERNEL_VERSION} https://github.com/torvalds/linux
+cd linux &&\
+  make defconfig &&\
+  make -j12
+
+cd "$BUILD_BASE" &&\
+  mkdir initramfs
+(cd initramfs && mkdir -p bin sbin etc proc sys usr/bin usr/sbin dev tmp)
+cp -a "${BUILD_BASE}"/busybox/busybox-$BUSY_BOX_VERSION/_install/* ./initramfs
+
+cat > "$INITRAMFS_BASE"/bin/init <<EOL
+#!/bin/sh
+mount -t proc none /proc
+mount -t sysfs none /sys
+exec sh
+EOL
+chmod +x "$INITRAMFS_BASE"/bin/init
+
+cat > "$INITRAMFS_BASE"/etc/inittab <<EOL
+::sysinit:/etc/init.d/rcS
+::respawn:-/bin/sh
+::askfirst:-/bin/sh
+::cttlaltdel:/bin/umount -a -r
+EOL
+chmod 755 "$INITRAMFS_BASE"/etc/inittab
+
+mkdir -p "$INITRAMFS_BASE"/etc/init.d
+cat > "$INITRAMFS_BASE"/etc/init.d/rcS <<EOL
+echo "----------mount all in fstab----------------"
+/bin/mount -a #Read / etc/fstab and load the file system
+mkdir -p /dev/pts
+mount -t devpts devpts /dev/pts
+echo /sbin/mdev > /proc/sys/kernel/hotplug
+mdev -s
+echo "****************Hello itas109******************"
+echo "Kernel Version:linux-5.4.50"
+echo "***********************************************"
+EOL
+chmod 755 "$INITRAMFS_BASE"/etc/init.d/rcS
+
+cat > "$INITRAMFS_BASE"/etc/fstab <<EOL
+#device mount-point type option dump fsck
+proc  /proc proc  defaults 0 0
+temps /tmp  rpoc  defaults 0 0
+none  /tmp  ramfs defaults 0 0
+sysfs /sys  sysfs defaults 0 0
+mdev  /dev  ramfs defaults 0 0
+EOL
+
+cd "$INITRAMFS_BASE"/dev
+sudo mknod console c 5 1
+sudo mknod null c 1 3
+sudo mknod tty1 c 4 1
+# sudo mknod dev/ram b 1 0
+
+cd "$INITRAMFS_BASE"
+find . -print0 | cpio --null -ov --format=newc | gzip -9 > ../initramfs.cpio.gz
+
+qemu-system-x86_64 \
+  -kernel "$BUILD_BASE"/linux/arch/x86/boot/bzImage \
+  -initrd "$BUILD_BASE"/initramfs.cpio.gz \
+  -nographic \
+  -m 512 \
+  -append "root=/dev/ram0 init=/bin/init console=ttyS0"