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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 DEBIAN

zipcloak

zipcloak(1)						      General Commands Manual						       zipcloak(1)

NAME

       zipcloak - encrypt entries in a zipfile

SYNOPSIS

       zipcloak [-d] [-b path] [-h] [-v] [-L] zipfile

ARGUMENTS

       zipfile	Zipfile to encrypt entries in

OPTIONS

       -b path
       --temp-path path
	      Use the directory given by path for the temporary zip file.

       -d
       --decrypt
	      Decrypt encrypted entries (copy if given wrong password).

       -h
       --help
	      Show a short help.

       -L
       --license
	      Show software license.

       -O path
       --output-file zipfile
	      Write output to new archive zipfile, leaving original archive as is.

       -q
       --quiet
	      Quiet operation.	Suppresses some informational messages.

       -v
       --version
	      Show version information.

DESCRIPTION

       zipcloak encrypts all unencrypted entries in the zipfile.  This is the default action.

       The -d option is used to decrypt encrypted entries in the zipfile.

       zipcloak uses original zip encryption which is considered weak.

       Note:  The encryption code of this program is not copyrighted and is put in the public domain.  It was originally written in Europe and can
	      be freely distributed from any country including the U.S.A.  (Previously if this program was imported into the U.S.A, it	could  not
	      be  re-exported  from  the  U.S.A to another country.)  See the file README.CR included in the source distribution for more on this.
	      Otherwise, the Info-ZIP license applies.

EXAMPLES

       To be added.

BUGS

       Large files (> 2 GB) and large archives not yet supported.

       Split archives not yet supported.  A work around is to convert the split archive to a single-file archive using zip and then  use  zipcloak
       on the single-file archive.  If needed, the resulting archive can then be split again using zip.

SEE ALSO

       zip(1), unzip(1)

AUTHOR

       Info-ZIP

								v3.0 of 8 May 2008						       zipcloak(1)
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