add rootfs_basic scripts

These scripts are provided to participants after the training to
allow them to quickly/easily reproduce the many steps of creating
a simple root filesystem from scratch.

These scripts also serve as an excellent reference for trainers
to follow during the live excercises.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

11 files changed, 161 insertions, 0 deletions

diff --git a/schulung_tools/rootfs_basic/scripts/README b/schulung_tools/rootfs_basic/scripts/README
new file mode 100755
index 0000000..dcfdec3
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/README
@@ -0,0 +1,24 @@
+#!/bin/sh
+set -e
+
+# download linux/busybox tarballs
+./download_kernel.sh
+./download_busybox.sh
+
+# unpack tarballs
+./unpack_kernel.sh
+./unpack_busybox.sh
+
+# build linux/busybox/hello
+./build_kernel.sh
+./build_busybox.sh
+./build_hello.sh
+
+# create root filesystem
+./create_rootfs.sh
+
+# configure/start nfs server
+./setup_nfs_server.sh
+
+# start arm emulator
+./start_vm.sh
diff --git a/schulung_tools/rootfs_basic/scripts/build_busybox.sh b/schulung_tools/rootfs_basic/scripts/build_busybox.sh
new file mode 100755
index 0000000..6beaf3b
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/build_busybox.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+set -e
+
+export CROSS_COMPILE=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
+
+cd busybox-1.28.1
+
+make defconfig
+make -j 4
+make install
+
+# check dependencies
+${CROSS_COMPILE}objdump -x busybox | grep NEEDED
diff --git a/schulung_tools/rootfs_basic/scripts/build_hello.sh b/schulung_tools/rootfs_basic/scripts/build_hello.sh
new file mode 100755
index 0000000..c9a06ff
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/build_hello.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+
+export CROSS_COMPILE=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
+
+cd ../src/hello
+
+${CROSS_COMPILE}gcc -c -fPIC file1.c file2.c
+${CROSS_COMPILE}gcc -shared -Wl,-soname,libhello.so.0 -olibhello.so.0.0.1 file1.o file2.o
+ln -sf libhello.so.0.0.1 libhello.so
+${CROSS_COMPILE}gcc -ohello hello.c -L. -lhello
+
+# check dependencies
+${CROSS_COMPILE}objdump -x hello | grep NEEDED
diff --git a/schulung_tools/rootfs_basic/scripts/build_kernel.sh b/schulung_tools/rootfs_basic/scripts/build_kernel.sh
new file mode 100755
index 0000000..427a56e
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/build_kernel.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+set -e
+
+export CROSS_COMPILE=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
+export ARCH=arm
+
+cd linux-4.15.5
+
+make vexpress_defconfig
+make -j 4 zImage
+make -j 4 modules
+make vexpress-v2p-ca9.dtb
diff --git a/schulung_tools/rootfs_basic/scripts/create_rootfs.sh b/schulung_tools/rootfs_basic/scripts/create_rootfs.sh
new file mode 100755
index 0000000..1ba104a
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/create_rootfs.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+set -e
+
+CROSS_BASE=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf
+CROSS_LIBC=$CROSS_BASE/arm-linux-gnueabihf/libc
+
+# create directories
+mkdir -p nfsroot/dev
+mkdir -p nfsroot/proc
+mkdir -p nfsroot/sys
+mkdir -p nfsroot/lib
+mkdir -p nfsroot/bin
+mkdir -p nfsroot/etc/ld.so.conf.d
+mkdir -p nfsroot/opt/acme/lib
+
+# copy dependencies
+cp $CROSS_LIBC/lib/ld-2.23.so nfsroot/lib/
+cp $CROSS_LIBC/lib/libc-2.23.so nfsroot/lib/
+cp $CROSS_LIBC/lib/libm-2.23.so nfsroot/lib/
+
+# copy busybox + links
+cp -a busybox-1.28.1/_install/* nfsroot/
+
+# copy gdbserver
+cp $CROSS_BASE/bin/gdbserver nfsroot/bin/
+
+# copy hello/libfunc
+cp ../src/hello/hello nfsroot/bin/
+cp ../src/hello/libhello.so.0.0.1 nfsroot/opt/acme/lib/
+
+# create ldconfig configuration files
+echo 'include /etc/ld.so.conf.d/*.conf' > nfsroot/etc/ld.so.conf
+echo '/opt/acme/lib' > nfsroot/etc/ld.so.conf.d/acme.conf
+
+# create dynamic loader cache
+qemu-arm $CROSS_LIBC/sbin/ldconfig -r nfsroot
+qemu-arm $CROSS_LIBC/sbin/ldconfig -r nfsroot -p
+
+# create init configuation
+cat > nfsroot/etc/inittab << 'EOF'
+::sysinit:/etc/rcS
+::askfirst:-/bin/sh
+EOF
+
+# create start script
+cat > nfsroot/etc/rcS << 'EOF'
+#!/bin/sh
+
+mount -t proc proc /proc
+mount -t sysfs sys /sys
+mount -t tmpfs tmpfs /dev
+mdev -s
+echo /sbin/mdev > /proc/sys/kernel/hotplug
+EOF
+chmod 0755 nfsroot/etc/rcS
diff --git a/schulung_tools/rootfs_basic/scripts/download_busybox.sh b/schulung_tools/rootfs_basic/scripts/download_busybox.sh
new file mode 100755
index 0000000..20e1bf7
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/download_busybox.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+
+wget --continue http://busybox.net/downloads/busybox-1.28.1.tar.bz2
diff --git a/schulung_tools/rootfs_basic/scripts/download_kernel.sh b/schulung_tools/rootfs_basic/scripts/download_kernel.sh
new file mode 100755
index 0000000..d729d2a
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/download_kernel.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+
+wget --continue https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.15.5.tar.xz
diff --git a/schulung_tools/rootfs_basic/scripts/setup_nfs_server.sh b/schulung_tools/rootfs_basic/scripts/setup_nfs_server.sh
new file mode 100755
index 0000000..6b7d7ee
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/setup_nfs_server.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+
+ROOTDIR="`pwd`/nfsroot"
+
+echo "$ROOTDIR 127.0.0.1(rw,sync,no_subtree_check,no_root_squash,insecure)" | sudo tee -a /etc/exports
+# sudo rpcinfo
+sudo systemctl restart nfs-kernel-server.service
+# sudo exportfs -ra
diff --git a/schulung_tools/rootfs_basic/scripts/start_vm.sh b/schulung_tools/rootfs_basic/scripts/start_vm.sh
new file mode 100755
index 0000000..bd41b2f
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/start_vm.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+export QEMU_AUDIO_DRV="none"
+
+BOOTPATH="`pwd`/linux-4.15.5/arch/arm/boot"
+
+# port forwarding rule for gdb
+GDB_FWD="hostfwd=tcp::2345-:2345"
+
+exec qemu-system-arm \
+	-M vexpress-a9 \
+	-m 128 \
+	-nographic \
+	-net nic -net user,$GDB_FWD \
+	-kernel $BOOTPATH/zImage \
+	-dtb $BOOTPATH/dts/vexpress-v2p-ca9.dtb \
+	-append "loglevel=7 console=ttyAMA0,115200 ip=dhcp root=/dev/nfs nfsroot=`pwd`/nfsroot,v3 rw"
diff --git a/schulung_tools/rootfs_basic/scripts/unpack_busybox.sh b/schulung_tools/rootfs_basic/scripts/unpack_busybox.sh
new file mode 100755
index 0000000..988a805
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/unpack_busybox.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+
+cat busybox-1.28.1.tar.bz2 | bzip2 -dc | tar -x -f -
diff --git a/schulung_tools/rootfs_basic/scripts/unpack_kernel.sh b/schulung_tools/rootfs_basic/scripts/unpack_kernel.sh
new file mode 100755
index 0000000..398ca5f
--- /dev/null
+++ b/schulung_tools/rootfs_basic/scripts/unpack_kernel.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+
+cat linux-4.15.5.tar.xz | xz -d -c | tar -x -f -