Hello! Here are the scripts I use to manage the removable hard drive media used to store daily archives of my backup servers via the GUI, instead of from the command line. Briefly, the system is set up like this:
BackupPC's pool is stored on a large internal hard drive. Every day at a little after 7:00 A.M., the backup server starts an archive of each host, which is stored on a second hard drive that is mounted in a removable tray. Once this is complete, the user can shut down the server, remove the hard drive, replace it with a different one, and turn the server back on. Once the new drive is in place, it is repartitioned, reformatted and remounted in place, ready for the next archive. There are two scripts that make this happen. The first one simply shuts the server down. The second one handles the repartitioning, reformatting and remounting. There is absolutely no reason why this couldn't be handed by simply ssh'ing into the server. Except that these servers are destined for network administrators for whom the command line is a tremendously evil thing, and if you try to sell them a solution that contains instructions like "Use putty, log into the server and type this command", they will say no. Hence, the CGI scripts... Because the scripts will be run by the webserver, they will be run with its permissions, which likely do not include the ability to shut down the server, or other such commands. The way I have done this is to use sudo, with the proper lines in sudoers. I've tried to make the commands as specific as posssible, to avoid possible security issues. To partition the drive, I am echoing responses to the fdisk command. I looked into parted, but I could not find a clean way of getting it to create a single large partition without knowing how big the partition was. Seeing as this will be used with drives of different sizes, I decided to stick with fdisk. Also, the HTML files that are cat to the user are created simply by saving any old BackupPC HTML page to a file, and chopping the part before the main body DIV into the top file, and the part after the main body DIV into the bottom file. If you have any suggestions as to how to make this script better, I would be happy to hear them. Otherwise, I hope they are useful to someone else. Tim Massey #!/bin/sh # shutdown.cgi - Shut down server echo "Content-type: text/html" echo "" cat bpc_top.html echo " <div id=\"Content\"> <div class=\"h1\">Shut Down Server</div> <p><h2>The system is being shut down!</h2></p> <p>This will take approximately 60 seconds. Do not remove the drive before the system has powered itself off.</p>" cat bpc_bottom.html sudo /sbin/shutdown -h now >/dev/null 2>&1 exit #!/bin/sh # instmedia.cgi - Install new media for BackupPC Archive echo "Content-type: text/html" echo "" cat bpc_top.html echo " <div id=\"Content\"> <div class=\"h1\">Initialize Removable Media</div> <p><h2>Initializing Removable Media</h2></p> <p>This will take approximately 10 minutes to complete, depending upon the size of the removable drive. Do not naviagate away from this page.</p>" echo "<P><B>Unmounting removable drive.</B></P>" sudo /bin/umount /var/lib/BackupPC/removable 2>&1 if [ `sudo /bin/df /var/lib/BackupPC/removable | grep "/var/lib/BackupPC/removable" | wc -l` = "1" ]; then echo "<P><H2>Error: drive did not unmount.</H2></P>" cat bpc_bottom.html exit fi echo "<P><B>Creating proper partition on drive.</B></P> <P>This will take approximately 45 seconds. Please wait.</P>" # Pipe responses for fdisk command via echo. # This does the following: # The first series of lines will delete all partitions on a drive with up to 9 # partitions. It does this by having pairs of delete commands: d9, d8, etc. # until it gets to the end. When there's just one partition, fdisk # doesn't ask for a number, so the last one is just a d. # This will actually generate lots of errors in practice: when there are no # more partitions left, the d's will generate an error saying that there are # no partitions to delete, and the numbers are interpreted as nonsense # commands. However, this is harmless. # It then goes through the sequence to create a new partition: # n (New partition) # p (Primary parition) # 1 (First partition) # <ENTER> (Default starting cylinder is the first one) # <ENTER> (Default ending cylinder is the last one) # w (Write the changes to disk and exit) # Several newlines are added at the end in case something goes wrong. # Three newlines in a row is interpreted by the fdisk command by # exiting immediately. echo " d 9 d 8 d 7 d 6 d 5 d 4 d 3 d 2 d n p 1 w " | sudo /sbin/fdisk /dev/hdc >/dev/null echo "<P><B>Formatting partition for use.</B></P> <P>This can take up to 10 minutes. Please wait.</P>" sudo /sbin/mke2fs -j -m 1 -LRemovableData /dev/hdc1 >/dev/null echo "<P><B>Mounting drive.</B></P>" sudo /bin/mount /var/lib/BackupPC/removable 2>&1 if [ `sudo /bin/df /var/lib/BackupPC/removable | grep "/var/lib/BackupPC/removable" | wc -l` = "0" ]; then echo "<P><H2>Error: Drive did not mount.</H1></P>" cat bpc_bottom.html exit fi echo "<P><B>Setting permissions.</B></P>" sudo /bin/chmod -R 750 /var/lib/BackupPC/removable 2>&1 sudo /bin/chown -R backuppc:backuppc /var/lib/BackupPC/removable 2>&1 echo "<P><H2>Drive change complete!</H2></P>" cat bpc_bottom.html exit Append the following to /etc/sudoers: # Lines added for BackupPC removable media GUI apache,backuppc ALL=(root) NOPASSWD: /sbin/shutdown -h now apache,backuppc ALL=(root) NOPASSWD: /bin/umount /var/lib/BackupPC/removable apache,backuppc ALL=(root) NOPASSWD: /bin/mount /var/lib/BackupPC/removable apache,backuppc ALL=(root) NOPASSWD: /sbin/fdisk /dev/hdc apache,backuppc ALL=(root) NOPASSWD: /sbin/mke2fs -j -m 1 -LRemovableData /dev/hdc1 apache,backuppc ALL=(root) NOPASSWD: /bin/chmod -R 750 /var/lib/BackupPC/removable apache,backuppc ALL=(root) NOPASSWD: /bin/chown -R backuppc:backuppc /var/lib/BackupPC/removable apache,backuppc ALL=(root) NOPASSWD: /bin/df /var/lib/BackupPC/removable ------------------------------------------------------------------------- Take Surveys. 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