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Top Forums Shell Programming and Scripting Diff. Backup Script Using TAR. Should be simple. Post 302162616 by protienplant on Tuesday 29th of January 2008 12:29:44 PM
Old 01-29-2008
Java Diff. Backup Script Using TAR. Should be simple.

I'm specifically trying to find help or insight on using the --incremental ('-G') option for creating a tar. Please resist the urge to tell me to use --listed-incremental ('-g') option. That's fairly well documented in the GNU tar manual. GNU tar 1.19

This is what the manual does say in section 5.2:
Quote:
The option ‘--incremental' (‘-G') .... When used with ‘--create' option, it creates an incremental archive without creating snapshot file. Thus, it is impossible to create several levels of incremental backups with ‘--incremental' option.
What I'm trying to do is write a small backup script that will create one tar file that contains all the changes since a level 0 tar dump of the directory I'm backing up. That way, I save time and resources only backing up new changes. Since I have no interest in creating multiple levels of incremental backups, it seems like the --incremental (-G) option is better suited to my task. And it would be nice not to have to hassle with a snapshot file if it's unnecessary.

Also, it appears that using the -N option isn't recommended for incremental/differential backups. From section 6.8 Operating Only on New Files:
Quote:
Please Note: ‘--after-date' and ‘--newer-mtime' should not be used for incremental backups. See section Using tar to Perform Incremental Dumps, for proper way of creating incremental backups.
Help is much appreciated.
Gabe
 

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th_get_pathname(3)						  C Library Calls						th_get_pathname(3)

NAME
th_get_pathname, th_get_uid, th_get_gid, th_get_mode, th_get_crc, th_get_size, th_get_mtime, th_get_devmajor, th_get_devminor, th_get_linkname - extract individual fields of a tar header TH_ISREG, TH_ISLNK, TH_ISSYM, TH_ISCHR, TH_ISBLK, TH_ISDIR, TH_ISFIFO - determine what kind of file a tar header refers to TH_ISLONGNAME, TH_ISLONGLINK - determine whether the GNU extensions are in use SYNOPSIS
#include <libtar.h> char *th_get_linkname(TAR *t); char *th_get_pathname(TAR *t); mode_t th_get_mode(TAR *t); uid_t th_get_uid(TAR *t); gid_t th_get_gid(TAR *t); int th_get_crc(TAR *t); off_t th_get_size(TAR *t); time_t th_get_mtime(TAR *t); major_t th_get_devmajor(TAR *t); minor_t th_get_devminor(TAR *t); int TH_ISREG(TAR *t); int TH_ISLNK(TAR *t); int TH_ISSYM(TAR *t); int TH_ISCHR(TAR *t); int TH_ISBLK(TAR *t); int TH_ISDIR(TAR *t); int TH_ISFIFO(TAR *t); int TH_ISLONGNAME(TAR *t); int TH_ISLONGLINK(TAR *t); VERSION
This man page documents version 1.2 of libtar. DESCRIPTION
The th_get_*() functions extract individual fields from the current tar header associated with the TAR handle t. The TH_IS*() macros are used to evaluate what kind of file is pointed to by the current tar header associated with the TAR handle t. The TH_ISLONGNAME() and TH_ISLONGLINK() macros evaluate whether or not the GNU extensions are used by the current tar header associated with the TAR handle t. This is only relevant if the TAR_GNU option was used when tar_open() was called. SEE ALSO
tar_open(3) University of Illinois Jan 2001 th_get_pathname(3)
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