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Full Discussion: Problem running zip from cron - bad zipfile offset
Top Forums Shell Programming and Scripting Problem running zip from cron - bad zipfile offset Post 302937041 by Agreppa on Monday 2nd of March 2015 07:02:56 PM
Old 03-02-2015
Problem running zip from cron - bad zipfile offset
I've created a pretty straightforward shell script to do backups via rsync. Every night it rsyncs a copy of a website (approx 60GB) to the local machine. Once a week, after the rsync step, it zips the local copy of the whole site into 2GB chunks and places them in another folder.

When running 'unzip filename.zip' I get a long string of errors similar to this:

Code:
file #17934:  bad zipfile offset (lseek):  1726201856
file #17935:  bad zipfile offset (lseek):  1726775296
file #17936:  bad zipfile offset (local header sig):  1702568762
file #17937:  bad zipfile offset (EOF):  1545311941

Approx 60% of the archived series of 2GB chunks unzips without any problem, but the rest shows those errors above. Those errors "seem" to be happening on files that were already .zip files on the webserver, and which were originally created with a mix of windows WinRAR and command line windows 'zip'. (I don't see how the original method of creation would impact them being zipped into a larger archive, but I'm mentioning it to be thorough).

ALSO: If I ftp the entire linux-created series of 2GB chunks to a Windows machine and open them in WinRAR, they all extract without any problem.

Here's the crontab I'm using:
Code:
2 * * 2-7 /home/user/Scripts/backup.rsync.sh > /mnt/data/Backups/logs/$(date +\%Y\%m\%d_\%H\%M\%S)_website.rsync.cron.log 2>&1
0 2 * * 1 /home/user/Scripts/backup.full.sh > /mnt/data/Backups/logs/$(date +\%Y\%m\%d_\%H\%M\%S)_website.full.cron.log 2>&1

And here are the 2 scripts referenced in that same cron with a lot of additional commands removed for clarity:

backup.rsync.sh
Code:
# Rsync website.com to local machine
/usr/bin/rsync -Pavzhe "ssh -p 22" --log-file=$dirlog/$date\_website.rsync.log --bwlimit=2500 --skip-compress=jpg/zip --delete user@website.com:'/home/user/' "/mnt/data/Backups/website.com"

backup.full.sh
Code:
# Rsync website.com to local machine
/usr/bin/rsync -Pavzhe "ssh -p 22" --log-file=$dirlog/$date\_website.rsync.log --bwlimit=2500 --skip-compress=jpg/zip --delete user@website.com:'/home/user/' "/mnt/data/Backups/website.com"
# Zip site to 2G chunks
/usr/bin/zip -r -s 2g -y -2 $dirzip/website_$date.zip $dircom/

Something in that final zip command seems to be the cause but I can't figure it out. The fact that I can take those resulting files into windows and extract them with winRAR is even more confusing, since linux 'unzip' throws thousands of errors... Can anyone suggest what's wrong with my batch script?

PS: The 'zip' version is 3.0-6 and 'unzip' is 6.0-8+deb7u2. The local machine is Crunchbang 11.
 

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LEARN ABOUT MOJAVE

zipnote

zipnote(1)						      General Commands Manual							zipnote(1)

NAME

       zipnote - write the comments in zipfile to stdout, edit comments and rename files in zipfile

SYNOPSIS

       zipnote [-w] [-b path] [-h] [-v] [-L] zipfile

ARGUMENTS

       zipfile	Zipfile to read comments from or edit.

OPTIONS

       -w     Write comments to a zipfile from stdin (see below).

       -b path
	      Use path for the temporary zip file.

       -h     Show a short help.

       -v     Show version information.

       -L     Show software license.

DESCRIPTION

       zipnote	writes the comments in a zipfile to stdout.  This is the default mode.	A second mode allows updating the comments in a zipfile as
       well as allows changing the names of the files in the zipfile.  These modes are described below.

EXAMPLES

       To write all comments in a zipfile to stdout use for example

	    zipnote foo.zip > foo.tmp

       This writes all comments in the zipfile foo.zip to the file foo.tmp in a specific format.

       If desired, this file can then be edited to change the comments and then used to update the zipfile.

	    zipnote -w foo.zip < foo.tmp

       The names of the files in the zipfile can also be changed in this way.  This is done by following lines like
	    "@ name"
       in the created temporary file (called foo.tmp here) with lines like
	    "@=newname"
       and then using the -w option as above.

BUGS

       The temporary file format is rather specific and zipnote is rather picky about it.  It should be easier to change file names in a script.

       Does not yet support large (> 2 GB) or split archives.

SEE ALSO

       zip(1), unzip(1)

AUTHOR

       Info-ZIP

								v3.0 of 8 May 2008							zipnote(1)
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