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CHAPTER 8: Automating Administrative Tasks
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## create our folder mkdir p "$watchFolder" &> /dev/null ## loop through all of the csv files in our watch folder, format them, ## import them, delete the formatted versions, and copy the original ## into an archive directory. for file in $(ls -1 "$watchFolder" | grep ".csv"); do declare x tempFile=$(mktemp /tmp/dsimport_XXXXX) cat "$watchFolder/$file" | csvtowgm o "$tempFile" csvtowgmResultCode=$ if [ $csvtowgmResultCode == 0 ]; then dsimport "$tempFile" "$dirNode" M username importadmin password 'importpassword' rm "$tempFile" mkdir "$watchFolder/archive/" &> /dev/null mv "$watchFolder/$file" "$watchFolder/archive/" else echo "Error generating import file! error num: $csvtowgmResultCode" exit $csvtowgmResultCode fi done
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This code would get the job done, but it does present numerous concerns. First and foremost, we are trusting the security of our user base to the contents of this folder. By using a merge import, it would certainly be possible for a file to be dropped into our watchfolder that completely trashes our directory, potentially overriding data for admin accounts or simply generating accounts for itself. Due to concerns such as these, the exact level of desired automation will greatly vary from environment to environment and will depend on the sensitivity of the data housed by the system and the security requirements set forth by the organization. A fully
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automated import process such as this is not advisable in any environment where security is a concern. However, even if the final dsimport is a manual step, simply by
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generating dsimport-style import files you are greatly reducing the possibility for human error, streamlining the import process, and ensuring more consistent results. Note: A common automation would also be to tailor this same script to create computers based on imaging events on a live system. For example, an imaged computer can write a text file or copy its computer information into a centralized database to aid in managed preferences. Additionally, the imaged system could automatically connect to the patch management framework you are utilizing. Finally, for larger installations where users are actually created in out-of-band solutions (e.g., Oracle-based Student Management System or SAP-based ERP solution) you can automatically generate user accounts based on events from those databases.
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CHAPTER 8: Automating Administrative Tasks
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If your script does anything more than a basic task, it is a good idea to log your output. Logging output can be useful to ensure that any automations are working as they should be, and to catch any errors that are discovered during the operation of your scripts. Likewise, log files can prove extremely handy for historic evaluation of performance and operation. Depending on your script, you may want to log to ~/Library/Logs, /Library/Logs, or /var/log. So how do you know which to log to ~/Library/Logs can be used whenever a script is initiated in userland, such as through a LaunchAgent or a user-specific crontab. For the majority of scripts, though, which likely run with root privileges, Apple s addition of a global /Library/Logs to the equation dilutes the situation a bit, as /var/log is the historic logging directory for many Unix and Linux systems and is even utilized by many Apple utilities. For instance, Disk Utility logs disk repair information to /var/log/fsck_hfs.log, and Apple s Installer app and Software Update app both log to /var/log/install.log. Logging to an output file can be achieved in a couple of different ways. First, you can simply use the echo command and redirect its output to your log file. For instance:
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logFile="/var/log/myprogram.log" echo "My Program: starting rsync!" >> "$logFile"
This works great for sending updates to a log file, and you can use the same type of technique with any command-line program:
rsync avu /folder1/ /folder1_copy/ &>> "$logFile"
Here, we utilize the redirect operator &>>, which redirects both stdout and stderr streams to /var/log/myprogram.log, appending to the end of the file. In this instance, we use this redirection if rsync outputs any errors; we want the errors to be written to our log. Alternatively, you can redirect all output streams of a script to a certain file in one line. This provides a quick and easy way to ensure logging of all of your script s events. To implement global redirects to your script, add the following line after your hashbang and prior to the implementation of any commands or log statements:
logFile="/var/log/myprogram.log" exec &>> "$logFile" ##From here on, all of our output will be redirected to our log file.
It may also be desirable to send log messages to syslog. This provides the added benefit of time-stamping output, and provides you with the ability to integrate your script logging with a more complex syslog system, should your organization employ one. To send messages to syslog, use the logger command:
logger t "$0" p user.notice s "hello"
The p flag tells logger to log using user.notice priority, which syslog will output to the system log, /var/log/system.log:
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