Kata initrd的生成过程
可参考kata_integration中make initrd流程，大致分为以下几步：
- 创建rootfs相关目录
- 将kata-agent重命名为init并放在rootfs根目录下
- 从编译环境中拷贝kata-agent所需二进制（如mount、umount）到rootfs usr/bin目录下
- 从编译环境中拷贝以上二进制（包含kata-agent）所需动态链接库到rootfs lib目录下
- 从编译环境中拷贝内核驱动模块ko文件到rootfs中内核驱动模块目录下
- 进入rootfs并执行以下命令生成initrd.img
( find . | cpio -H newc -o | gzip -9 ) > ./kata-containers-initrd.img
initrd定制参考脚本
script_dir="$(dirname $(readlink -f $0))"
rpmlist=${script_dir}/make-initrd-rpm.list
BUILD_PATH="./build"
IMAGE_NAME=${IMAGE_NAME:-kata-containers-initrd.img}
AGENT_INIT=${AGENT_INIT:-yes}
ROOTFS_DIR=${ROOTFS_DIR:-/tmp/kataAgent-rootfs}
# create a temp dir to store rootfs
rm -rf ${ROOTFS_DIR}
mkdir -p ${ROOTFS_DIR}/lib \
${ROOTFS_DIR}/lib64 \
${ROOTFS_DIR}/lib/modules
mkdir -m 0755 -p ${ROOTFS_DIR}/dev \
${ROOTFS_DIR}/sys \
${ROOTFS_DIR}/sbin \
${ROOTFS_DIR}/bin \
${ROOTFS_DIR}/tmp \
${ROOTFS_DIR}/proc
if [ ! -f "${BUILD_PATH}/kata-agent" ];then
echo "kata-agent doesn't exist!"
exit 1
fi
# kata-agent
cp ${BUILD_PATH}/kata-agent ${ROOTFS_DIR}/init
# busybox
cp /sbin/busybox ${ROOTFS_DIR}/sbin/
# cp run request files in initrd
cat $rpmlist | while read rpm
do
if [ "${rpm:0:1}" != "#" ]; then
rpm -ql $rpm > /dev/null 2>&1
if [ $? -ne 0 ]; then
continue
fi
array=($(rpm -ql $rpm| grep -v "share" | grep -v ".build-id"))
for file in ${array[@]};
do
source=$file
dts_file=${ROOTFS_DIR}$file
dts_folder=${dts_file%/*}
if [ ! -d "$dts_folder" ];then
mkdir -p $dts_folder
fi
cp -r -f -d $source $dts_folder
done
fi
done
#create symlinks to busybox
BUSYBOX_BINARIES=(/bin/sh /bin/mount /bin/umount /bin/ls /bin/ps /bin/file /bin/ldd /bin/tar /bin/hwclock /sbin/modprobe /sbin/depmod /bin/ip /bin/modinfo /bin/insmod /bin/rmmod)
for bin in ${BUSYBOX_BINARIES[@]}
do
mkdir -p ${ROOTFS_DIR}/`dirname ${bin}`
ln -sf /sbin/busybox ${ROOTFS_DIR}/${bin}
done
LDD_BINARIES=(/init /sbin/busybox)
for bin in ${LDD_BINARIES[@]}
do
ldd ${ROOTFS_DIR}${bin} | while read line
do
arr=(${line// / })
for lib in ${arr[@]}
do
echo $lib
if [ "${lib:0:1}" = "/" ]; then
dir=${ROOTFS_DIR}`dirname $lib`
mkdir -p "${dir}"
cp -f $lib $dir
fi
done
done
done
(cd ${ROOTFS_DIR} && find . | cpio -H newc -o | gzip -9 ) > ${BUILD_PATH}/${IMAGE_NAME}
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