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Full Discussion: How to deal with Tar error ?
Operating Systems AIX How to deal with Tar error ? Post 302974644 by bakunin on Wednesday 1st of June 2016 07:31:10 PM
Old 06-01-2016
Quote:
Originally Posted by filosophizer
sorry, if my question was misunderstood, what i meant was, how to check if a tar file has all the files in it without any errors / problems

My question : How can a user find out if his/her tar file has some files with errors/problems or no errors/problems
OK, i indeed have misunderstood the question. Sorry, my bad.

Well, there are diagnostic messages and a return code when you create the tar-file. These are always to be observed when creating an archive non-interactively (like inside a batch). In general it is good style to check return-codes in scripts, regardless of which command it is.

This is bad style:

Code:
command1
command2
command3

this is better and safer:

Code:
if ! command1 ; then
     echo "command1 failed" >> errorlog
fi
if ! command2 ; then
     echo "command2 failed, aborting." >> errorlog
     exit 1
fi
[...]

If you take your tar-archive this way you will notice upon creation that something was rotten in the state of Denmark.

Now, if you only have the archive and restore files: you can't know (at least not for sure) if the content is corrupt or not. The content of a tar-archive are archived files. tar can find out if the archive itself is damaged (by taking and testing checksums), but if a wrongly read file is archived correctly it will be "correct" from tars POV.

I hope this helps.

bakunin
 

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LEARN ABOUT PHP

shape_tar

SHAPE_TAR(1)						      General Commands Manual						      SHAPE_TAR(1)

NAME

       shape_tar - shapeTools RMS bundle up subsystem in a tar or shar archive

SYNOPSIS

	shape tar[VERSIONS=<version_selection_rule>] [ARCHIVE=<filename>]

       shape shar[VERSIONS=<version_selection_rule>] [ARCHIVE=<filename>]

DESCRIPTION

       Shape tar and shape shar create a tar or a shar archive containing all source components of the current node in the system tree. All source
       components listed in the COMPONENTS macro in the Makefile and the release identification file (VERSIONFILE) are	written  to  the  archive.
       Components of subsystems are not included in the archive file.

       The  VERSIONS  macro  may  be  set  to  specify a version selection rule to be active during archive file creation. Default is most_recent,
       selecting the most recent version of each component. See shape_stdrul(7) or the $(SHAPELIBPATH)/stdrules for other possible  settings.  You
       may also use self defined version selection rules as VERSIONS.

       ARCHIVE	is  the base name of the file where the output shall be written to. Default is $(SUBSYSTEMNAME). The output file gets the filename
       extension .tar (resp. .shar).  When ARCHIVE=- is given, data will be written to standard output.

SEE ALSO

       shape_RMS(1), shape_stdrul(7)

FILES

       $(SUBSYSTEMNAME).tar $(SUBSYSTEMNAME).shar

20.7.119															      SHAPE_TAR(1)
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