我正在使用 GNU tar 来处理 tar（docker 映像的层）来修改其中的一些 jar。我在做：
- 将图像作为 tar 保存到磁盘
- 提取它，所以我将每一层都放在一个目录中
- 进入每一层，我有一个
layer.tar，一个json和一个VERSION - 迭代所有
*/*.jar文件layer.tar，试图找到一些类文件 - 如果我找到它们，提取具有文件树结构的 jar，从中删除类文件，然后将其放回
layer.tar，覆盖原始 jar - 将每一层打包回一个新的 tar，使用 docker 加载并稍后推送（尚未完成）
我为此创建了一个脚本，它几乎可以完成工作，但有 2 个罐子一个接一个，一个带有要删除的类，另一个没有它。
#!/bin/bash
# tar needs find to package without ".". u for update, c for create
function pack_all_without_period() {
find $1 -printf "%P\n" -type f -o -type l -o -type d | sudo tar -$3vf $2 --no-recursion -C $1 -T -
}
if [ -z $1 ]; then
printf "Save the image as tar, extract, and enter each layer to remove the vulnerable classes(JMSAppender/SocketServer/SimpleSocketServer)\nPlease provide the image name. \n"
exit 1
fi
dir="log4j-1.x-fix"
image_tar=amq-image-to-fix.tar
if [ ! -d $dir ]; then
mkdir $dir
fi
# save image to tar
docker save $1 -o $image_tar
# extract tar
tar xf $image_tar -C $dir
# each layer is extracted to a folder, each folder has a "layer.tar".
# Go into each folder, extract `layer.tar`, and use `jar` to remove the classes
# and package them back to `layer.tar` (-a to append), and delete the extracted folders.
# at last, package all layers + manifest.json and so back into another tar, WITHOUT COMPRESSION
cd $dir
# enter layer and exit
for layer in */; do
echo Processing layer $layer
cd $layer
# tar does not support overwrite, as tape cannot be overwritten; so I wanted to remove the original jar from tar,
# then append it back with tar -u/-A/-r; but then I found tar --delete is extremely slow(by design)
# so at last I have to extract all files and package them back
mkdir temp
sudo tar --extract --directory=temp --file layer.tar --wildcards "*.jar" # file tree is preserved, so package them back is easy
if [[ $? -eq 0 ]]; then
for f in $(find . -mindepth 2 -name "*.jar" -not -type l -printf "%P\n"); do # exclude jolokia.jar(link)
sudo jar -tvf $f | grep -E "(*JMSAppender*.class|*SocketServer.class|*log4j*.class)"
if [[ $? -eq 0 ]]; then
echo Found classes in $f
read -p "Do you want to remove these classes? (Y/N) " option
if [[ $option == 'Y' || $option == 'y' ]]; then
echo Removing class file from $f
sudo zip -d $f "*JMSAppender.class" "*SocketServer.class" "*SimpleSocketServer.class"
######### here I need to delete the original jar with the classes I just deleted, but I don't know how ############
else continue
fi
else
continue
fi
done
# append folders to tar, without leading "."
echo Appending modified folders to layer.tar anew
pack_all_without_period temp layer.tar r
fi
sudo rm -r $(find . -maxdepth 1 -mindepth 1 -type d -print)
cd .. # back to $dir
done
cd ..
# tar will always include a folder "." as root. This function get rid of it, so the archive
# only contains the content of the folder
# compress will preserve ownership and group by default; and to extract while preserving the same info,
# we use '--same-owner', which is used by default when using sudo.
# again, append all layers and files to new tar, without leading "."
echo after processing all layers, we are at $(pwd)
pack_all_without_period $dir amq-image-fixed.tar c
sudo rm -Irv $dir $image_tar
但我发现：
tar只能追加，不会覆盖。所以我改变了它，所以我会先删除原来的 jarlayer.tar然后追加- 然后我发现它
tar --delete some/path/foo.tar不适用于tar --file xxx --delete path-to-jar. GNU tar 文档声称--delete可以在标准输入和标准输出的管道中工作（https://www.gnu.org/software/tar/manual/html_node/delete.html）但是正确的语法是什么？我尝试了这些但没有工作：
sudo tar tf layer.tar $f | sudo tar --delete #not deleting
sudo tar xf layer.tar --exclude $f | sudo tar cf layer.tar -T - # create tar of size 0
还有一些注意事项：
- 我不想提取所有文件，因为每一层都包含
/usr或/boot我不想处理。我的罐子基本上都在下面/opt（不是 100% 确定） - 我需要保留所有权/时间戳等。这就是我使用的原因
sudo（但不确定这是否能达到我的目的）
我使用这样的脚本：
./remove-log4j-1.x-classes.sh registry.access.redhat.com/jboss-amq-6/amq63-openshift:1.4-44.1638430186
请帮忙，谢谢！
编辑：我现在尝试：
tar tf layer.tar -O | tar f - --delete $f > layer-new.tar
或者
zcat -f layer.tar | tar f - --delete $f > layer-new.tar
但我因错误而失败：
tar: opt/amq/lib/optional/log4j-1.2.17.redhat-1.jar: Not found in archive
tar: Exiting with failure status due to previous errors
