Hi, I am using Kernel 5.15.* Linux, tested both ext4 and btrfs using GNU tar 1.30 or latest 1.35.
tar 1.35 is compiled from source. The configure line is: ./configure --enable-acl --enable-backup-scripts --with-posix-acls --with-selinux --with-xattrs I want use tar to backup files with immutable attribute set by "chattr +i" in Linux. Command lines below(on ext4): mdx@e5450:~$ touch test.txt mdx@e5450:~$ sudo chattr +i test.txt mdx@e5450:~$ lsattr test.txt ----i---------e---- test.txt mdx@e5450:~$ sudo tar --acls --selinux --xattrs --xattrs-include='*' -cpvvzf test.tar.gz test.txt -rw-r--r-- mdx/mdx 0 2024-03-01 16:30 test.txt mdx@e5450:~$ mkdir test mdx@e5450:~$ sudo tar --acls --selinux --xattrs --xattrs-include='*' -xpvvzf test.tar.gz -C test -rw-r--r-- mdx/mdx 0 2024-03-01 16:30 test.txt mdx@e5450:~$ lsattr test/test.txt --------------e---- test/test.txt mdx@e5450:~$ You see, the immutable attribute is gone after extracting. I can use bsdtar 3.3.3 archive test.txt, the immutable attribute will be preserved. Detail below: mdx@e5450:~$ sudo bsdtar -cvvzf test.btar.gz test.txt a -rw-r--r-- 1 mdx mdx 0 Mar 1 16:30 test.txt mdx@e5450:~$ mkdir btest mdx@e5450:~$ sudo bsdtar -xvvzf test.btar.gz -C btest x -rw-r--r-- 0 mdx mdx 0 Mar 1 16:30 test.txt mdx@e5450:~$ lsattr btest/test.txt ----i---------e---- btest/test.txt Is it possible preserve file immutable attribute set by "chattr +i" when using GNU tar in Linux? Or add this function into GNU tar?
