[Bug-tar] --verify --files-from -g over nfs causes "Contents differ" error

[Erik Bryer]

Hello,

GNU tar 1.23: --verify used with --listed-incremental (-g) when tarring an NFS 
filesystem (Linux 2.6.18) results in a "Contents differ" error. Either option 
can be used alone successfully. Together they result in an error and a non-zero 
exit status.

In this test, machine1:/home is mounted on server1:/n/machine1/home. The 
blocksizes for the two filesystems are 4096, and the kernels are CentOS: 
2.6.18-164.11.1 and 2.6.18-164.15.1, respectively. Default NFS export 
parameters were used. 

address@hidden TEST]$ pwd
/home/user1/TEST
address@hidden TEST]$ ls
list
address@hidden TEST]$ cat list
/n/machine1/home/user1/IDLWorkspace
address@hidden TEST]$ tar -cvf foo.tar -g snap --verify --files-from=list -P 
--no-check-device 
tar: /n/machine1/home/user1/IDLWorkspace: Directory is new
tar: /n/machine1/home/user1/IDLWorkspace/.metadata: Directory is new
tar: /n/machine1/home/user1/IDLWorkspace/Default: Directory is new
tar: /n/machine1/home/user1/IDLWorkspace/.metadata/.plugins: Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources:
 Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.debug.core: 
Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.ui.workbench:
 Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects:
 Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.root:
 Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.safetable:
 Directory is new
tar: 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects/Default:
 Directory is new
/n/machine1/home/user1/IDLWorkspace/
/n/machine1/home/user1/IDLWorkspace/.metadata/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects/Default/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.root/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.safetable/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.debug.core/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.ui.workbench/
/n/machine1/home/user1/IDLWorkspace/Default/
/n/machine1/home/user1/IDLWorkspace/install.log
/n/machine1/home/user1/IDLWorkspace/install.log.syslog
/n/machine1/home/user1/IDLWorkspace/.metadata/.lock
/n/machine1/home/user1/IDLWorkspace/.metadata/.log
/n/machine1/home/user1/IDLWorkspace/.metadata/version.ini
/n/machine1/home/user1/IDLWorkspace/Default/.project
Verify /n/machine1/home/user1/IDLWorkspace/
/n/machine1/home/user1/IDLWorkspace: Contents differ
Verify /n/machine1/home/user1/IDLWorkspace/.metadata/
/n/machine1/home/user1/IDLWorkspace/.metadata: Contents differ
Verify /n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins: Contents differ
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources:
 Contents differ
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects/
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects:
 Contents differ
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.projects/Default/
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.root/
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.core.resources/.safetable/
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.debug.core/
Verify 
/n/machine1/home/user1/IDLWorkspace/.metadata/.plugins/org.eclipse.ui.workbench/
Verify /n/machine1/home/user1/IDLWorkspace/Default/
Verify /n/machine1/home/user1/IDLWorkspace/install.log
Verify /n/machine1/home/user1/IDLWorkspace/install.log.syslog
Verify /n/machine1/home/user1/IDLWorkspace/.metadata/.lock
Verify /n/machine1/home/user1/IDLWorkspace/.metadata/.log
Verify /n/machine1/home/user1/IDLWorkspace/.metadata/version.ini
Verify /n/machine1/home/user1/IDLWorkspace/Default/.project
address@hidden TEST]$ echo $?
1
address@hidden TEST]$ 

(I don't use this directory.) This error vanishes if either -g or --verify (or 
both) is removed.