[yocto] Access Control List (ACL) permissions attributes not getting preserved in rootfs

[Kumar, Shrawan]

Hello All,

Further update on this issue , migrated to "e2fsprogs_1.43.bb"  from "e2fsprogs_1.42.9.bb" . It is observed that the ACL permission set are visible on dev-shell  but when qemu is launched we get below error :

root at qemux86:#getfacl /usr/bin/helloworld
getfacl: /usr/bin/helloworld: Invalid argument


Also,
 
root at qemux86:# setfacl -m u:user2:r-- /usr/bin/helloworld 
               setfacl: /usr/bin/helloworld: Invalid argument


Is this known and fixed already  ?

Google shows that similar observations are seen , are they related ?
https://www.suse.com/support/kb/doc?id=7003064
https://bbs.archlinux.org/viewtopic.php?id=211463
https://access.redhat.com/solutions/752523



Thanks and Regards
Shrawan




-----Original Message-----
From: Joshua G Lock [mailto:joshua.g.lock at linux.intel.com] 
Sent: Friday, August 12, 2016 7:22 PM
To: Kumar, Shrawan; yocto at yoctoproject.org
Subject: Re: [yocto] Access Control List (ACL) permissions attributes not getting preserved in rootfs

On Fri, 2016-08-12 at 12:33 +0000, Kumar, Shrawan wrote:
> Hello All,
>  
> I am  using  poky “ jethro”  , and  though  one of my recipe, I have 
> created user1 & user2 and then trying to set ACL rules  on 
> “helloworld” bin as below :
>  
>  
> do_install() {
>                     install -d ${D}${bindir}
>                     install -m 0700 helloworld ${D}${bindir}
>                     install -d ${D}/lib/systemd/system
>                     install -m 0700 hello.service 
> ${D}/lib/systemd/system/
>                     chown    user1:group1 ${D}${bindir}/helloworld
>                    setfacl -m u:user2:r-- ${D}${bindir}/helloworld }
>  
>  
> è When I see   on the devshell ( bitbake HelloWorld –c devshell)  :
> poky/build_qemux86/tmp/work/qemux86-poky-linux/core-image-
> minimal/1.0-r0/rootfs/usr/bin# getfacl helloworld    , I could see 
> that ACL permissions are set correctly as below :
> -        # file: helloworld
> -        # owner: user1
> -        # group: group1
> -        user::rwx
> -        user:user2:r--
> -        group::---
> -        mask::r--
> -        other::---
>  
> However, It does not seems to be getting preserved in rootfs. :
> /poky/build_qemux86/tmp/work/qemux86-poky-linux/core-image-
> minimal/1.0-r0/rootfs/usr/bin# getfacl helloworld # file: helloworld # 
> owner: user1 # group: group1 user::rwx
> group::---
> other::---
>  
> quick help  here would be highly appreciated

This is due to the fact that we don't currently have a mechanism to preserve xattr through to image construction[1].

The largest barrier for doig so is that the package managers (certainly dpkg and rpm) don't have any support for xattrs in packages (an image is populated via the package manager).

To the best of my knowledge the only option for adding some xattr/ACL is to use a postinst[2] to set the attributes after the package has been installed.

Regards,

Joshua

1. https://bugzilla.yoctoproject.org/show_bug.cgi?id=9858
2. http://www.yoctoproject.org/docs/2.1/dev-manual/dev-manual.html#new-
recipe-post-installation-scripts