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Top Forums Shell Programming and Scripting Need help with error checking
# 1  
Old 08-31-2007
Error Need help with error checking
I am creating a script that will automatically use sftp to connect to a site and download a file, extract the tar and then delete the tar file once completed.

What I am stuck on is the error checking for this process.

Here is the code so far:

Quote:

#!/bin/bash
cd /usr/local
sftp -b ftpbatch root@192.168.0.199

## ftpbatch changes the dir and gets the tar file

tar -xvf *.tar
rm -rf *.tar
Now this works for me as is, but i need error checking for 2 points.

1 for the ftp connection to wait 2 minutes and retry if there is no connection and to spawn off a yellow warning message to an email address at 10 minutes and a red warning message at 20. After 20 minutes the script dies.

The second message which i may or may not need, is one to monitor the tar output for any error messages. This is not as important as the first one however.


Any suggestions or help will be appreciated!

Thank you
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LEARN ABOUT SUSE

virt-tar

virt-tar(1)						      Virtualization Support						       virt-tar(1)

NAME

       virt-tar - Extract or upload files to a virtual machine

SYNOPSIS

	virt-tar [--options] -x domname directory tarball

	virt-tar [--options] -u domname tarball directory

	virt-tar [--options] disk.img [disk.img ...] -x directory tarball

	virt-tar [--options] disk.img [disk.img ...] -u tarball directory

OBSOLETE

       This tool is obsolete.  Use virt-copy-in(1), virt-copy-out(1), virt-tar-in(1), virt-tar-out(1) as replacements.

EXAMPLES

       Download "/home" from the VM into a local tarball:

	virt-tar -x domname /home home.tar

	virt-tar -zx domname /home home.tar.gz

       Upload a local tarball and unpack it inside "/tmp" in the VM:

	virt-tar -u domname uploadstuff.tar /tmp

	virt-tar -zu domname uploadstuff.tar.gz /tmp

WARNING

       You must not use "virt-tar" with the -u option (upload) on live virtual machines.  If you do this, you risk disk corruption in the VM.
       "virt-tar" tries to stop you from doing this, but doesn't catch all cases.

       You can use -x (extract) on live virtual machines, but you might get inconsistent results or errors if there is filesystem activity inside
       the VM.	If the live VM is synched and quiescent, then "virt-tar" will usually work, but the only way to guarantee consistent results is if
       the virtual machine is shut down.

DESCRIPTION

       "virt-tar" is a general purpose archive tool for downloading and uploading parts of a guest filesystem.	There are many possibilities:
       making backups, uploading data files, snooping on guest activity, fixing or customizing guests, etc.

       If you want to just view a single file, use virt-cat(1).  If you just want to edit a single file, use virt-edit(1).  For more complex cases
       you should look at the guestfish(1) tool.

       There are two modes of operation: -x (eXtract) downloads a directory and its contents (recursively) from the virtual machine into a local
       tarball.  -u uploads from a local tarball, unpacking it into a directory inside the virtual machine.  You cannot use these two options
       together.

       In addition, you may need to use the -z (gZip) option to enable compression.  When uploading, you have to specify -z if the upload file is
       compressed because virt-tar won't detect this on its own.

       "virt-tar" can only handle tar (optionally gzipped) format tarballs.  For example it cannot do PKZip files or bzip2 compression.  If you
       want that then you'll have to rebuild the tarballs yourself.  (This is a limitation of the libguestfs(3) API).

OPTIONS

       --help
	   Display brief help.

       --version
	   Display version number and exit.

       -c URI
       --connect URI
	   If using libvirt, connect to the given URI.	If omitted, then we connect to the default libvirt hypervisor.

	   If you specify guest block devices directly, then libvirt is not used at all.

       --format raw
	   Specify the format of disk images given on the command line.  If this is omitted then the format is autodetected from the content of
	   the disk image.

	   If disk images are requested from libvirt, then this program asks libvirt for this information.  In this case, the value of the format
	   parameter is ignored.

	   If working with untrusted raw-format guest disk images, you should ensure the format is always specified.

       -x
       --extract
       --download
       -u
       --upload
	   Use -x to extract (download) a directory from a virtual machine to a local tarball.

	   Use -u to upload and unpack from a local tarball into a virtual machine.  Please read the "WARNING" section above before using this
	   option.

	   You must specify exactly one of these options.

       -z
       --gzip
	   Specify that the input or output tarball is gzip-compressed.

SHELL QUOTING

       Libvirt guest names can contain arbitrary characters, some of which have meaning to the shell such as "#" and space.  You may need to quote
       or escape these characters on the command line.	See the shell manual page sh(1) for details.

SEE ALSO

       guestfs(3), guestfish(1), virt-cat(1), virt-edit(1), virt-copy-in(1), virt-copy-out(1), virt-tar-in(1), virt-tar-out(1), Sys::Guestfs(3),
       Sys::Guestfs::Lib(3), Sys::Virt(3), <http://libguestfs.org/>.

AUTHOR

       Richard W.M. Jones <http://people.redhat.com/~rjones/>

COPYRIGHT

       Copyright (C) 2009 Red Hat Inc.

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

libguestfs-1.18.1						    2013-12-07							       virt-tar(1)