Re: [Bug-tar] tar 1.25 listed-incremental extract bug

[Fast Jack]

Hi,

I can confirm that sometime between version 1.23 and 1.25 a bug must
have been introduced.
Extracting an incremental backup using tar 1.23 works as I expected:

address@hidden test]# tar -C target/ --extract
--listed-incremental=/dev/null --file=full.tar -vvv to_backup
drwxr-xr-x root/root        32 2011-01-06 14:07 to_backup/
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/deleted
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/modified
-rw-r--r-- root/root         6 2011-01-06 14:06 to_backup/unmodified
address@hidden test]# tar -C target/ --extract
--listed-incremental=/dev/null --file=incr.tar -vvv to_backup
drwxr-xr-x root/root        23 2011-01-06 14:09 to_backup/
tar: Deleting `to_backup/deleted'
-rw-r--r-- root/root        14 2011-01-06 14:10 to_backup/modified
address@hidden test]#
address@hidden test]# dir target/to_backup/
total 8
-rw-r--r-- 1 root root 14 Jan  6 14:10 modified
-rw-r--r-- 1 root root  6 Jan  6 14:06 unmodified

Since the file 'deleted' was removed right before creating the
incremental backup it was also removed when restoring incr.tar.
Doing the same restore witgh tar 1.25 gives different results:

address@hidden test]# tar -C target/ --extract
--listed-incremental=/dev/null --file=full.tar -vvv to_backup
drwxr-xr-x root/root        32 2011-01-06 14:07 to_backup/
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/deleted
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/modified
-rw-r--r-- root/root         6 2011-01-06 14:06 to_backup/unmodified
address@hidden test]#
address@hidden test]# tar -C target/ --extract
--listed-incremental=/dev/null --file=incr.tar -vvv to_backup
drwxr-xr-x root/root        23 2011-01-06 14:09 to_backup/
-rw-r--r-- root/root        14 2011-01-06 14:10 to_backup/modified
address@hidden test]#
address@hidden test]# dir target/to_backup/
total 12
-rw-r--r-- 1 root root  6 Jan  6 14:07 deleted
-rw-r--r-- 1 root root 14 Jan  6 14:10 modified
-rw-r--r-- 1 root root  6 Jan  6 14:06 unmodified

The bug may have to do with the current directory tar was called from.
 When I am already withing the target-directory even tar 1.25 does the
correct thing:

address@hidden test]# cd target/
address@hidden target]# tar  --extract --listed-incremental=/dev/null
--file=../full.tar -vvv to_backup
drwxr-xr-x root/root        32 2011-01-06 14:07 to_backup/
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/deleted
-rw-r--r-- root/root         6 2011-01-06 14:07 to_backup/modified
-rw-r--r-- root/root         6 2011-01-06 14:06 to_backup/unmodified
address@hidden target]#
address@hidden target]# tar  --extract --listed-incremental=/dev/null
--file=../incr.tar -vvv to_backup
drwxr-xr-x root/root        23 2011-01-06 14:09 to_backup/
tar: Deleting `to_backup/deleted'
-rw-r--r-- root/root        14 2011-01-06 14:10 to_backup/modified
address@hidden target]#
address@hidden target]# dir to_backup/
total 8
-rw-r--r-- 1 root root 14 Jan  6 14:10 modified
-rw-r--r-- 1 root root  6 Jan  6 14:06 unmodified


Best regards