最近因為工作需求，需要編輯ISO文件，向ISO文件裡添加配置文件

Linux 環境下編輯ISO文件, 以一個小的Linux (bmu_mini.iso ~ 50M) 為例子。

1. 首先是mount iso: #mount -o loop,ro ${iso_file} ${mnt}
2. 可以将${mnt}裡的内容拷貝到 ${tmp}中
3. 進入${tmp}, 可以根據需求編輯裡面的内容，本次主要是向initrd.img中添加部分文件。
1. 首先解壓inintrd0.img，然後添加需要的配置文件。當然用戶也可以做其他的編輯，編輯完後再壓縮并替換initrd.img
4. 利用genisoimage 來rebuid iso
5. umount ${mnt}及清理tmp文件等。

iso_modify.sh腳本：

#!/bin/bash # # Script to modify the contents of the iso image. # # functions # Use can do change in initrd0.img, Here I just add target/BMU.cfg function add_config_to_initrd() { echo "adding config file..." target_dir="target" if [ ! -d "${target_dir}" ]; then echo "Go to create direcroty ${target_dir}" mkdir -p ${target_dir} fi cp ${iso_path}/BMU.cfg ${target_dir}/BMU.cfg } function customize_initrd() { initrd=${iso_work_tmp}/isolinux/initrd0.img if [ ! -f ${initrd} ]; then echo "Something is wrong and ${initrd} was not found" umount ${iso_work_mnt} exit 1 fi orig_size=$(ls -s ${initrd} | cut -d' ' -f 1) tmp_initrd_dir=${iso_work}/tmp_initrd_dir_${tstamp} mkdir -p ${tmp_initrd_dir} pushd ${tmp_initrd_dir} # extracting initrd0.img echo "Extracting initrd0.img ..." ftype=$(file -b ${initrd}) zip=0 if $(echo $ftype | grep -q "gzip"); then $(zcat ${initrd} | cpio --quiet -idum) zip=1 elif $(echo $ftype | grep -q "cpio"); then $(cpio --quiet -idum -I ${initrd}) fi echo "Adding custom config to initrd ..." add_config_to_initrd echo "Rebuilding initrd0.img ..." newinitrd=${iso_work}/myinitrd-${tstamp}.img if [ ${zip} -eq 1 ]; then find . -print0 | cpio --null -o -H newc | gzip -9 > ${newinitrd} else find . -print0 | cpio --null -o -H newc -o ${newinitrd} fi new_size=$(ls -s ${newinitrd} | cut -d' ' -f 1) cp ${newinitrd} ${iso_work_tmp}/isolinux/initrd0.img popd echo "Cleaning up initrd tmp directory ..." rm -rf ${tmp_initrd_dir} echo "Original initrd size : ${orig_size}k ($((${orig_size} / 1024))M)" echo "New initrd size: ${new_size}k ($((${new_size} / 1024))M)" } # rebuild iso rebuild_iso() { ## # Use: genisoimage, isohybrid (if applicable) to recreate ISO image # # genisoimage -V <label> -G <boot-code> -r <iso-filesystem> -o <new.iso> ## # get current ISO image volume ID and reuse volid=$(isoinfo -d -i ${iso_file} | grep 'Volume id:' | cut -d' ' -f3) # strip ".iso" from iso image file name, if exists image_name=${iso_file##*/} iso_name=${iso_work}/${image_name}-mini-${tstamp} # remove existing boot catalog file #rm -f ${iso_work_tmp}/boot.cat #genisoimage -V "${volid}" -J -l -r -hide-rr-moved -hide-joliet-trans-tbl -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-info-table -boot-load-size 4 -o ${iso_name}.iso ${iso_work_tmp} genisoimage -verbose -verbose -V "${volid}" -J -l -r -hide-rr-moved -hide-joliet-trans-tbl -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-info-table -boot-load-size 4 -eltorito-alt-boot -efi-boot isolinux/efiboot.img -no-emul-boot -o ${iso_name}.iso ${iso_work_tmp} iso_format=$(file ${iso_name}.iso | grep "ISO 9660") [ -n "${iso_format}" ] && { cp ${iso_name}.iso ${iso_name}-9660.iso mv ${iso_name}.iso ${iso_name}-hd.iso isohybrid --uefi ${iso_name}-hd.iso } echo "${iso_name}-hd.iso" } # # (1) check iso exist or not iso_file=$1 if [ ! ${iso_file} ]; then echo "please input iso full path" fi if [ ! -f ${iso_file} ]; then echo "iso file ${iso_file} not found" exit 1 fi # # get iso file path and prepare tmp folder iso_path=${iso_file%/*} echo "iso Path is ${iso_path}" iso_work=${iso_path}/work if [ -d ${iso_work} ]; then rm -rf ${iso_work} fi mkdir ${iso_work} cd ${iso_work} iso_work_mnt=${iso_work}/mnt iso_work_tmp=${iso_work}/tmp mkdir -p ${iso_work_mnt} mkdir -p ${iso_work_tmp} before=$(ls -s ${iso_file} | cut -d' ' -f 1) tstamp=$(date ' %Y%m%d%H%M') # # (2) mount iso to /mnt and then copy data to /tmp mount -o loop,ro ${iso_file} ${iso_work_mnt} if [ $? -ne 0 ]; then echo "mount iso image ${iso_file} failed" fi echo "copying iso image to tmp area ..." cp -rf ${iso_work_mnt}/* ${iso_work_tmp} ls ${iso_work_tmp} # # (3) Then user can customize initrd echo "customizing initrd ..." customize_initrd # # (4) Rebuild iso echo "rebuilding iso ..." new_iso_file=$(rebuild_iso) after=$(ls -s ${new_iso_file} | cut -d' ' -f 1) echo "Original ISO file size: ${before}K ($((before / 1024))M)" echo "Shrunk ISO file size:${after}K ($((after / 1024))M)" echo "Copying new iso image to working directory ..." cp ${new_iso_file} ${iso_file} # # (5) umount iso and clean tmp folder umount ${iso_work_mnt} if [ $? -ne 0 ]; then echo "Unable to unmount iso image" fi rmdir ${iso_work_mnt} rm -rf ${iso_work_tmp} exit 0

bmu_mini.iso文件是基于CentOS7并裁剪，隻包含了EFI，isolinux, LiveOS, [BOOT] 等文件夾。

運行及輸出結果：

結果比較：

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