Bug 13241 - A problem with test for xattrs transfer
A problem with test for xattrs transfer
Status: NEW
Product: rsync
Classification: Unclassified
Component: core
3.1.2
x86 Linux
: P5 normal
: ---
Assigned To: Wayne Davison
Rsync QA Contact
:
Depends on:
Blocks:
  Show dependency treegraph
 
Reported: 2018-01-23 13:11 UTC by Michal Ruprich
Modified: 2018-03-01 12:04 UTC (History)
1 user (show)

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Description Michal Ruprich 2018-01-23 13:11:59 UTC
Hi,

when running tests for rsync on Fedora, it fails on the xattrs.test and xattrs-hlink.test. It always fails on the line

rsync -aiX --fake-super --link-dest=../chk . ../to

with this result:

--- omitted ---
 user.dir1="need to test directory xattrs too"
 user.dir2="another xattr"
 user.dir3="this is one last one for the moment"
+user.rsync.security.selinux="unconfined_u:object_r:user_home_t:s0"
--- omitted ---

for basically every file. This only happens when the --fake-super option is on. For instance line 

rsync-3.1.2/rsync  -aiX -H --super --link-dest=../chk . ../to 

is not affected. 

Looking at the xls() method in the test, it uses 'getfattr -d'. The original files will never show the user.rsync.security.selinux="unconfined_u:object_r:user_home_t:s0" with this command. This attribute has to be specifically asked for with 'getfattr -n security.selinux'. 

Looking into the code the function sys_lgetxattr is used to get extended attributes and it asks specifically for the security.selinux attribute. And this attribute gets transferred to the destination file and is visible with 'getfattr -d'.

Example:
> mkdir dir_a dir_b
> echo "Hello world" > dir_a/foo.txt
> getfattr -d dir_a/foo.txt
> getfattr -n security.selinux dir_a/foo.txt
# file: dir_a/foo.txt
security.selinux="unconfined_u:object_r:user_home_t:s0"
> rsync -aiX --fake-super dir_a/ dir_b/
> getfattr -d dir_b/foo.txt
# file: dir_b/foo.txt
user.rsync.security.selinux="unconfined_u:object_r:user_home_t:s0"
>

As you can see rsync transfers this attribute and it is visible after issuing 'getfattr -d'. I'm not sure if this should happen but either the xattrs.txt file used for the diff in the test should be edited or there is something wrong with the --fake-super option combined with -X.

Thanks for any help on this.

Michal
Comment 1 Dave Gordon 2018-02-28 20:51:49 UTC
When I run "make check" (version 3.1.3) the xattrs test reports

Running .../rsync/rsync -aiX -f-x_system.* -f-x_security.* --fake-super --link-dest=../chk . ../to

which appears to be specifically excluding copying any system.* or security.* xattrs in --fake-super mode (and the same in --super mode, for that matter), thus avoiding spurious diffs for additional xattrs that may be present on certain systems.

So it looks like this problem is already fixed by
commit 87bc2240115a2a1beadd098518a17719908da2cb
Author: Wayne Davison <wayned@samba.org>
Date:   Sun Jan 22 16:01:45 2017 -0800

.Dave.
Comment 2 Michal Ruprich 2018-03-01 12:04:38 UTC
Thanks for the answer Dave, I filed this bug a few days before the 3.1.3 version came out. I was trying the make check with 3.1.2 release and there it was failing. With the new version this test passes without problems.