Questions tagged [xattr]

Extended attributes (commonly called "xattrs") are a way to associate metadata with files/directories in the filesystem.

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35 views

rsync --itemize-changes lists some xattr differences, but getfattr shows no difference

On my Arch Linux machine, I want to verify btrfs backups of snapshots using rsync. The following rsync command is used to check for changes: sudo rsync -n --itemize-changes --checksum -a --delete --...
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3answers
1k views

How to make a symlink read only (`chattr +i /location/symlink`)?

How can we lock a symlink so it cannot be deleted? With a normal file/directory chattr +i /file/location can achieve this but doing so with a symlink we get chattr: Operation not supported while ...
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0answers
17 views

Prevent deletion of folder by accidentally moving or deleting parent folder that has no immutable attribute [duplicate]

In the PARENT_FOLDER I store subfolders with some works I am producing each week, e.g. right now I have these contents: ~/PARENT_FOLDER/StuffProducedTwoWeeksAgo/... ~/PARENT_FOLDER/...
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1answer
71 views

Btrfs - max xattr size?

What is actual max allowed size of btrfs xattr? I tried to test this on few systems and got entirely different results (between 11kB and 15kB) so I'm not sure what actually determines this size and ...
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0answers
68 views

ext4 xattr: “No data available” from Samba

I've recently installed a Samba4 server and I'm managing user permissions via Windows ACL, which stores access information into filesystem's xattr properties. Everything works, unfortunately I ...
3
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1answer
130 views

crontab -e, permission denied after malware infection

Caused by: My machine was infected with the redis mining worm Here are some files under /root/.ssh (it's hidden, using ls -la I can see it), I remove them and some other related files, hope it won't ...
5
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1answer
515 views

Linux File Capabilities are lost when I modify the file. Is this expected behavior?

When I modify a file, the file capabilities I had set earlier are lost. Is this the expected behavior? I first set a file capability: $ setcap CAP_NET_RAW+ep ./test.txt $ getcap ./test.txt ./test....
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2answers
227 views

How do I delete an immutable encrypted file?

I was experimenting with encryption on an ext4 filesystem and I encrypted a file (using fscrypt) which was set to be immutable (via chattr +i). I have now lost the encryption key and uninstalled ...
16
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6answers
23k views

How to clone/copy all file/directory attributes onto different file/directory?

I want to copy the attributes (ownership, group, ACL, extended attributes, etc.) of one directory to another but not the directory contents itself. This does not work: cp -v --attributes-only A B cp:...
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3answers
6k views

Tell if a folder/file is hidden in Mac OS X

I know you can set or unset the hidden flag of a folder/file by doing chflags hidden foo.txt and chflags nohidden foo.txt. But is there anyway of telling whether the folder/file is currently hidden ...
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0answers
75 views

Unable to use setfattr command to set POSIX ACL on the file and directory

Below is the test directory. Inside this, I have demo.txt file and demo directory. root@debian:/home/XXXXX/test# ls -l total 4 drwxr-xr-x 2 XXXXX XXXXX 4096 Nov 23 15:33 demo -rw-r--r-- 1 XXXXX ...
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1answer
54 views

How to protect folder from being removed/moved, but no constraint for files inside

Here's what I want to achieve: I want to protect folder /mnt/sdmmc0p2/test from being removed or moved, but files inside can be removed. I try to use chattr +a /mnt/sdmmc0p2/test, but fail. ~# ...
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0answers
165 views

How to remove a file attribute with chattr linux?

I have file that has the immutable attribute: ----ia-------e-- And I try to remove the attribute with chattr -i file.php / chattr -a file.php but it's not working. The file modified by old server ...
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0answers
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lsattr returns different results depending on how it's run

I'm using lsattr on a linux container on the contents of a mounted drive that's been mounted using SAMBA and am seeing some interesting results. If I run lsattr in quick succession, I get differing ...
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2answers
1k views

See extended attributes with coreutils ls on Mac

I have coreutils installed via MacPorts on my Mac running OS X 10.8.4. I have ls set to use the coreutils version of ls [(GNU coreutils) 8.21] when available: if [ -e /opt/local/libexec/gnubin ]; ...
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2answers
5k views

Why doesn't `getfattr -d` show anything?

The successful command from which I started: getfattr -n system.ntfs_times /media/hdd/oldfolder/ output getfattr: Removing leading '/' from absolute path names # file: media/hdd/oldfolder/ ...
9
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1answer
11k views

find files with extended attributes [duplicate]

Can I use find to find all files which have extended attributes set? Let's say, I want to find all files with +i, immutable attribute in /foo and its subfolders. I could not find any, mention of ...
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2answers
954 views

Why does “attr -l .” tell me about an “selinux” attribute that “attr -g selinux .” refuses to read?

I'm setting up a Fedora (Core) 24 system from scratch, and ran into this oddness: > sudo attr -l . Attribute "selinux" has a 41 byte value for . > sudo attr -g selinux . attr_get: No data ...
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1answer
4k views

In docker, “chattr: Operation not permitted while setting flags on file”

I'm ssh'ed into a local Centos 7 docker container* and I'm trying to run sudo chattr +i file1 but I'm getting an error: chattr: Operation not permitted while setting flags on file1 What's going on ...
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4answers
14k views

How to set `chattr +i` for my `/etc/resolv.conf `?

My os: debian9. The filesystem on my disk: $ sudo blkid | awk '{print $1 ,$3}' /dev/sda2: TYPE="ext4" /dev/sda1: TYPE="vfat" /dev/sda3: TYPE="ext4" /dev/sda4: TYPE="ext4" /dev/sda5: TYPE="swap" Now ...
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1answer
100 views

How to make files undeletable but moveable in linux server?

I am managing some folders on our server. The server runs: REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux" REDHAT_SUPPORT_PRODUCT_VERSION="7.6" I have created a directory in "/srv/" and named it "...
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1answer
87 views

How does cd's “-@” parameter work?

bash's man page (and help cd) mentions that cd supports a -@ parameter ("on systems that support it") to "present a file with extended attributes as a directory containing the file attributes" Is ...
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0answers
2k views

Unable to delete files even with root, lsattr is also not responding

I have two somehow corrupt files in my second hard disk of my laptop, which has dual boot Ubuntu 15.04 and Windows 7. I keep it mounted as a ntfs formatted partition in media. I share this drive ...
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1answer
719 views

Is there a tool in Linux to add an extended attribute to a file?

The getfattr tool is used to get the extended attributes of a file, but is there a tool to add an extended attribute to a file?
5
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1answer
573 views

What are costs of storing xattrs on ext4, btrfs filesystems?

I imagine that adding n xattrs of length l of to f files and d directories may generate costs: storage path resolution time / access time ? iteration over directories? (recursive find over (fresh ...
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0answers
192 views

How to mount ecryptfs and preserve individual SELinux tag of underlying files?

I am trying to mount ecryptfs on a system that uses SELinux (e.g. Cent-OS), and I want to preserve the security tag of all individual underlying files. Using mount -o command I can set the security ...
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1answer
146 views

Cent OS 6.3 Hidden files in shell

I want to be able to check whether a file is hidden or not in Cent OS 6.3. These are often referred to as (dot) files but I can clearly see Cent OS 6.3 handling these by appending a ~(tilde) to the ...
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2answers
242 views

How can I prevent ROOT from deleting a directory, but still allow root to have full control of all files and subdirectories within it?

chattr +a would be perfect if it only applied to the root of directory, not everything from there on. Is there a way to limit chattr to just the one folder (e.g. the opposite of -R as is normally ...
18
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1answer
14k views

How do I get a dump of all extended attributes for a file?

Getfattr dumps a listing of extended attributes for a selected file. However, getfattr --dump filename only to dumps the user.* namespace and not the security.*, system.*, and trusted.* namespaces....
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1answer
3k views

Inappropriate ioctl for device while reading flags on <file>

I am unable to set or view file attributes using lsattr and chattr commands on Reiser File System. Following result is observed: chattr +i Temp.txt chattr: Inappropriate ioctl for device while ...
2
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1answer
4k views

how to enable xattr support in Debian 9 (Stretch)

I have added user_xattr in ext4 but when I remount it doesn't show xattr & I installed attr & attr_dev # <file system> <mount point> <type> <options> <...
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0answers
116 views

Is it normal that I need u+w to set extended filesystem attributes?

I noticed that on panfs, Python's copystat fails when the source file does not have the u+w permission bit set; setting attributes fails with Permission denied command line equivalent: (attr_set: ...
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0answers
474 views

How to synchronize files differing only in xattr

I am using rsync to synchronize my files but I have come to a problem when in source I add some tags (or in general probably modify xattrs) to the file, no other changes and it seems that this does ...
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2answers
1k views

Unison and extended file attributes

I have two machines, one Debian, one Ubuntu, both on ext4 with extended file attributes enabled in fstab. getfattr and setfattr are installed and work perfectly on both machines locally. However, ...
2
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1answer
2k views

Cannot set file attribute

I'm trying to use setfattr, but always get Operation not supported In my home directory, I'm doing the following: touch delete.me setfattr -n naomi -v washere delete.me This returns setfattr: ...
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0answers
46 views

Ftp'd files have secure deletion attribute set

I have recently upgraded to a LAMP server running on Centos 7, with vsftpd for uploading files. As a hack, I use the secure deletion attribute to tag certain files to keep track of which ones ...
4
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1answer
2k views

Can't set extended attributes on ext4 on fedora 22 - operation not supported

I am trying to get extended attributes working on Fedora 22. I can't seem to be able to set the attributes even on my files, but I can read them. Here's how it looks: [jarek@localhost ~]$ cd /tmp/ [...
15
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1answer
2k views

State of ZFS xattr support in FreeBSD

I'm trying to work out whether or not, or rather to what extend, xattrs are supported in FreeBSD using ZFS. I've read some conflicting information. zfs get xattr lists it as on (default) for /, /usr ...
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1answer
351 views

OpenVZ acl support for Samba

Setting up Samba-4.3.5 as AD domain fileserver in OpenVZ container, running in ProxMox (pve-manager/3.4-6/102d4547 running kernel: 2.6.32-39-pve). Hardware node has enabled acl support for /var/lib/vz....
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0answers
233 views

let rm truncate files

A friend of mine has one directory (/var/mail) on his Linux machine where rm seems to truncate files if he has no write permissions on the directory. I like this feature and wonder how could I do the ...
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2answers
2k views

Make directory unmodifiable or undeletable except by root

I would like to prevent a directory from being deleted, let's assume the directory has this path ~/foo is there a way to make it deletable only by the root user, without using sudo and without being ...
1
vote
1answer
439 views

How to prevent a directory from being edited

How to prevent a directory (including all of its contents), from being edited? Using command chattr, you can prevent a directory from being deleted: chattr +i folder But, you can edit this ...
5
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1answer
3k views

Extended attribute on symbolic link

I'm trying to set some extended attributes on a symbolic link on Fedora 15. According to setfattr's usage, there is an option -h for such purpose: setfattr 2.4.44 -- set extended attributes Usage: ...
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0answers
638 views

On MAC OS X 10.11.4 - Loss of extended file attribute when copying a file

I have a file with a comment as extended attribute. This is how I can see the attribute from the Terminal: mdls -name kMDItemFinderComment path_to_file I get the answer kMDItemFinderComment = "...
2
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1answer
224 views

ACL and plain old permissions

I have read a bunch of articles, but still cannot get an idea of ACL, so I have following questions. What are benefits of using ACL over old permissions (0777 for example) and changing file owner, ...
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2answers
5k views

How can I give files extended attributes in mac os x?

How can I give files extended attributes in mac os x? Mac os x doesn't have the 'setattr' command.
5
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1answer
7k views

What is the effect of “chattr +a” on a directory

The a Linux file attribute is often documented as applicable to files. chattr(1) manpage: A file with the 'a' attribute set can only be open in append mode for writing. ext4 wiki: 0x20 File ...
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1answer
301 views

Automatically set append attribute for newly created files/folders?

I'm trying to setup a folder so that users can only create or modify files/folders in it, but not delete them. I tried the 'chattr +a' command and got different results in RHEL5.8 and RHEL6.5 ...
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4answers
180 views

I need to make a file undeleteable, but allow it to be modifiable and renameable

I have a script that checks for the presence of a file, and if it exists, read a list of email addresses from it to send notifications. When I don't need to be notified, for instance, when I'm at work ...
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2answers
2k views

File compression - how to implement in Linux

I would like to be able to compress certain files (that I need to keep, but use rarely) on disk. I noticed that chattr +c flags a file for compression, but it doesn't seem to actually compress files. ...