cowardly refusing to create an empty archive Post: 302574183

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Top Forums Shell Programming and Scripting cowardly refusing to create an empty archive Post 302574183 by agama on Wednesday 16th of November 2011 06:29:25 PM

11-16-2011

Registered User

Quote:

Originally Posted by stunnerz_84

@agama..I did try your code..It printed out all the files (including zip files) in that directory and created a zip of all the mentioned files..But what i am not sure is..how would this help me out...Please make me understand!!!

Thanks Again!!!!

My sample was to illustrate how using xargs with tar could lead to undesired results if xargs needs to "split" the command.

If the output from the find is more than can be placed on a single command, xargs will execute the command given (tar in your case) multiple times. With each execution the output file will be created and when finished it will contain only the files that were placed on the last command started by xargs. You may not be running into the limit now, and you might not ever hit the limit, but you could and the only symptom would be a "partial" backup.

Did you check the table of contents of the file that it created? When I ran it on my system the tar file contained only the last file printed.

---------- Post updated at 18:29 ---------- Previous update was at 18:05 ----------

I've been playing round with ways to safely use tar with xargs... I think this should work for you and will eliminate the xargs risk:

Code:

find . -name "*.txt" -type f -mtime +10 | xargs -r tar -rzvf filetar.tar.gz

Yes, there are two -r options. The one for xargs is as decribed before. Replacing the -c option on the tar command with -r causes the archive to be updated (appended to) if it exists. I tested this on both FreeBSD and Linux.

agama

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zip_close

ZIP_CLOSE(3)						     Library Functions Manual						      ZIP_CLOSE(3)

NAME

       zip_close - close zip archive

LIBRARY

       libzip (-lzip)

SYNOPSIS

       #include <zip.h>

       int zip_close(struct zip *archive);

DESCRIPTION

       The  zip_close  function closes archive and frees the memory allocated for it.  If any files within were changed, those changes are written
       to disk first.  If writing changes fails, zip_close fails and archive is left unchanged.  If archive contains no files, the  file  is  com-
       pletely removed (no empty archive is written).

RETURN VALUES

       Upon successful completion 0 is returned.  Otherwise, -1 is returned and the error code in archive is set to indicate the error.

ERRORS

       zip_close will fail if:

	      [ZIP_ER_EOF]
		  Unexpected end-of-file found while reading from a file.

	      [ZIP_ER_INTERNAL]
		  The callback function of an added or replaced file returned an error but failed to report which.

	      [ZIP_ER_INVAL]
		  The path argument is NULL.

	      [ZIP_ER_MEMORY]
		  Required memory could not be allocated.

	      [ZIP_ER_NOZIP]
		  File is not a zip archive.

	      [ZIP_ER_READ]
		  A file read failed.

	      [ZIP_ER_RENAME]
		  A temporary file could not be renamed to its final name.

	      [ZIP_ER_SEEK]
		  A file seek failed.

	      [ZIP_ER_TMPOPEN]
		  A temporary file could not be created.

	      [ZIP_ER_WRITE]
		  A file write failed.

	      [ZIP_ER_ZLIB]
		  An error occurred while (de)compressing a stream with zlib(3).
       Additionally, any errors returned by the callback function for added or replaced files will be passed back.

SEE ALSO

       libzip(3), zip_error_get(3), zip_fdopen(3), zip_open(3), zip_strerror(3)

AUTHORS

       Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at>

NiH								 February 15, 2009						      ZIP_CLOSE(3)

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