bash 如何防止符号链接被 tar 文件提取命令覆盖
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how to prevent symbolic links overwritten from tar file extract command
提问by forum.test17
Note:Overwriting of the symlinks occurs from tar version 1.27 or higher
注意：从 tar 版本 1.27 或更高版本开始覆盖符号链接
Below I am trying to show what exactly the problem is.
下面我试图说明问题到底是什么。
contents of the dirtmp1
dirtmp1 的内容
file1.txt
file2.txt
code to create the above directory
创建上述目录的代码
rm -f -r dirtmp1 && mkdir dirtmp1 && cd dirtmp1 && touch file1.txt && touch file2.txt && ls -al
creating a symbolic link
创建符号链接
cd ..
ln -s dirtmp1/ symlink1
now create the tar file which contains the name as symlink1
现在创建包含名称为 symlink1 的 tar 文件
mkdir dirtmp1
cd dirtmp1
mkdir symlink1 && cd symlink1 && touch iNeedThisfile.txt && cd .. && tar -cvzf symlink1.tar.gz symlink1/
Extract the tar file in folder(symlnk1) is overwriting the symbolic link. All I want is preserve the symbolic link and copy the "iNeedThisfile.txt"
提取文件夹（symlnk1）中的 tar 文件会覆盖符号链接。我想要的只是保留符号链接并复制“iNeedThisfile.txt”
After running this command tar -xvf symlink1.tar.gz
运行此命令后 tar -xvf symlink1.tar.gz
symlink1:
total 0
-rw-r--r-- 1 root root 0 Mar 24 18:14 iNeedThisfile.txt
symlink1:
total 0
-rw-r--r-- 1 root root 0 Mar 24 18:14 iNeedThisfile.txt
Any flags while extracting which preserves the symbolic links while extracting. and copies the files to the folder pointed by the symbolic link.
提取时保留符号链接的任何标志。并将文件复制到符号链接指向的文件夹。
I apologise for not able to convey my message in fewer lines of text.
我很抱歉无法用更少的文本行传达我的信息。
回答by Brian
I had the same problem. In my case, tar 1.23 had the proper behavior (preserved the symbolic link) while 1.26 had the "new" behavior (deleted the symbolic link and created a directory instead).
我有同样的问题。就我而言，tar 1.23 具有正确的行为（保留符号链接），而 1.26 具有“新”行为（删除符号链接并改为创建目录）。
I found adding the -h flag to the tar on the EXTRACT does the job. The symbolic link is preserved and the file(s) are added to the directory it points to.
我发现将 -h 标志添加到 EXTRACT 上的 tar 可以完成这项工作。符号链接被保留，文件被添加到它指向的目录中。
E.g., I had to go from tar zxf foo.tar.gz to tar -h -zxf foo.tar.gz
例如，我不得不从 tar zxf foo.tar.gz 到 tar -h -zxf foo.tar.gz
