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tar xzCf --mode doesn't work.

 
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Top Forums UNIX for Dummies Questions & Answers tar xzCf --mode doesn't work.
# 1  
Old 09-26-2011
tar xzCf --mode doesn't work.
Code:
[ ~/test]$ touch x y
[ ~/test]$ ls -l x y
-rw-r--r-- 1  g660 0 Sep 26 03:38 x
-rw-r--r-- 1  g660 0 Sep 26 03:38 y
[ ~/test]$ chmod 777 x y
[ ~/test]$ ls -l x y
-rwxrwxrwx 1  g660 0 Sep 26 03:38 x
-rwxrwxrwx 1  g660 0 Sep 26 03:38 y
[ ~/test]$ rm a.tar
[ ~/test]$ tar cvzf a.tar.gz .
./
./x
./y
./a.tar.gz
[ ~/test]$ ls -l
total 4
-rw-r--r-- 1  g660 180 Sep 26 03:38 a.tar.gz
-rwxrwxrwx 1  g660   0 Sep 26 03:38 x
-rwxrwxrwx 1  g660   0 Sep 26 03:38 y
[ ~/test]$ cd
[ ~]$ /bin/tar xvzCf
[ ~]$ cd test
[ ~/test]$ rm x y
[ ~/test]$ cd
[ ~]$ /bin/tar xvzCf ~/test ~/test/a.tar.gz --mode a-w
./
./x
./y
./a.tar.gz
[ ~]$ ls -l test
total 0
-rw-r--r-- 1  g660 0 Sep 26 03:38 a.tar.gz
-rwxr-xr-x 1  g660 0 Sep 26 03:38 x
-rwxr-xr-x 1  g660 0 Sep 26 03:38 y
[ ~]$

I provided --mode a-w to remove "w" bit from "all". But it only removed for others and not for the "user". I was hoping to see 555 and instead I see 755.

Why? My umask, BTW, is set to 022.
Last edited by volbod; 09-26-2011 at 10:04 AM.. Reason: Please use code tags
# 2  
Old 09-26-2011
The man page indicates that --mode works when ADDING to not extracting from an archive.
# 3  
Old 09-26-2011
set a temporary umask in your shell when doing an extract.

Code:
umask 222

then you can reapply your normal env settings
# 4  
Old 09-26-2011
Yes. Looks like I missed the point that the --mode is applicable only while "adding" the files and not during extraction.

Code:
[ ~/test]$ !touch
touch x y
[ ~/test]$ !ch
chmod 777 x y
[ ~/test]$ ls -l x y 
-rwxrwxrwx 1  g660 0 Sep 26 19:46 x 
-rwxrwxrwx 1  g660 0 Sep 26 19:46 y 
[ ~/test]$ umask
22
[ ~/test]$ tar cvzf a.tar.gz . --mode a-w
./
./x
./y
./a.tar.gz
[ ~/test]$ tar -tvzf a.tar.gz 
dr-xr-xr-x /g660     0 2011-09-26 19:46:50 ./
-r-xr-xr-x /g660     0 2011-09-26 19:46:50 ./x
-r-xr-xr-x /g660     0 2011-09-26 19:46:50 ./y
-r--r--r-- /g660     0 2011-09-26 19:47:07 ./a.tar.gz
[ ~/test]$

And if I need to be doubly sure that while untarring the "w" permissions are indeed knocked out, then i just need to set the umask as 222.

Was hoping to be able to provide the umask as part of the "tar" command (to untar) itself ; instead of setting umask to 222 and resetting it back to the original value.
 
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