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tar: how to preserve atime? (also on extracted version, not just original)


 
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Top Forums UNIX for Advanced & Expert Users tar: how to preserve atime? (also on extracted version, not just original)
# 1  
Old 12-14-2008
Tools tar: how to preserve atime? (also on extracted version, not just original)

How do I make tar set the correct atime on the extracted version? The option --atime-preserve works just on the original, not on the extracted file.
The extracted files always have current time as atime, which is bad.
# 2  
Old 12-14-2008
use the -p option when you extract it.
# 3  
Old 12-15-2008
Tools

That was quick. Thanks!


Quote:
Originally Posted by frank_rizzo
use the -p option when you extract it.

This does not seem to work though. See below an example where 2 files (with different atimes) are archived and extracted somewhere else. The last line of output shows that the atime was not preserved.

$ ls -lt origin/b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 03:52 origin/bla2
-rw-r--r-- 1 dsilt2 dsilt2 4 2007-07-07 22:22 origin/bla1
$ ls -ltu origin/b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 03:52 origin/bla2
-rw-r--r-- 1 dsilt2 dsilt2 4 2007-07-07 22:22 origin/bla1
$ cd origin/
$ tar --atime-preserve -cvpf archive.tar *
bla1
bla2
$ mv archive.tar ../destination/
$ cd ../destination/
$ tar xvpf archive.tar
bla1
bla2
$ ls -lt b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 03:52 bla2
-rw-r--r-- 1 dsilt2 dsilt2 4 2007-07-07 22:22 bla1
$ ls -ltu b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 04:01 bla1
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 04:01 bla2
# 4  
Old 12-15-2008
can you add --atime-preserve when you do the extract?
# 5  
Old 12-15-2008
Tools

Quote:
Originally Posted by frank_rizzo
can you add --atime-preserve when you do the extract?
Sure. Same result. Files are as in previous shell log.

$ rm destination/bla*
$ cd destination/
$ tar --atime-preserve -xvpf archive.tar
bla1
bla2
$ ls -lt b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 03:52 bla2
-rw-r--r-- 1 dsilt2 dsilt2 4 2007-07-07 22:22 bla1
$ ls -ltu b*
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 04:22 bla1
-rw-r--r-- 1 dsilt2 dsilt2 4 2008-12-15 04:22 bla2
# 6  
Old 12-15-2008
Quote:
Originally Posted by frankie06
How do I make tar set the correct atime on the extracted version?
I should add that I don't necessarily have to work with tar, *any* tool that can do it is fine by me, say cpio, scp, and so on. It's just that tar, according to its documentation, at least *seems* able to preserve time and atime (and permissions of course). If someone knows of any other tool that can move files between computers and preserves those 3 things, that's fine by me too.
# 7  
Old 12-15-2008
Hi.

My reading of this:
Code:
`--atime-preserve'
     Tells `tar' to preserve the access time field in a file's inode
     when reading it.

-- excerpt from info tar

leads me to believe that this on the source side, not on the target side. In other words, tar obtains the inode times, reads the file into the accumulation of the output file, then resets the inode times to the original.

Some filesystems are set not to even record the access times, since it is often of limited value and causes disk activity.

If my supposition is correct, then one could use touch to reset the access times on the target -- tedious, but doable.

Perhaps someone will stop by with a definitive answer ... cheers, drl

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