[Bug-tar] [GNU tar 1.15.1] testsuite: 20 failed

[Jozef Behran]

Results of my investigation:

It is a design bug. In the snapshot file tar lists only the 
directories and the time when the snapshot has been created. When 
creating the next incremental backup tar traverses the directory 
tree, compares the directories to the list in the snapshot file and 
the files to the timestamp. But when the file is renamed only but not 
touched, its timestamp is not changed and so the file is left 
unadded.

To correct this you must treat files and directories equally. That 
means list all these objects in the snapshot file and when creating 
incremental backup, compare each file in the filesystem to the 
snapshot. Comparing files only to the "central timestamp" is not 
enough.

testsuite.log
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