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the granularity that they provide can be useful. If you only have a couple of network home users, this may be a good option, but utilizing a group for this still scales better. It is also recommended to avoid deploying these at the computer or computer group level. The main reason for this is that these redirections are user agnostic. That is, when they re deployed at the computer level they will redirect the folders of all users who login, even those with local homes. This isn t a terribly big deal, but it s unnecessary and unsightly. If you use /Users/%@/ as your redirection store, or if you utilize portable home directories (discussed in the section Home Directory Syncing later in this chapter) then you will definitely have problems. Therefore, this really leaves you to deploying at the group level. This works for the most part, but what if certain users should have network homes on some computers (wired nodes), but should also have local homes on others (laptops) If you deploy redirects at the group level, then you get your redirects on your local homes. This example illustrates the main problem with MCXbased redirections. There is no way to introduce them with logic. This leads you to the other method of redirection: loginhooks. Because of the unparalleled freedom that you have, redirecting folders is just a few lines of code away, or not. Login hook scripts, when done properly, require a decent amount of logic. A very basic login script is pretty easy to assemble.
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#!/bin/sh PATH="/bin:/usr/bin:/usr/sbin" # simple login redirection script # get our user theUser=$1 # get our home eval theHome=~$1 # if we are a local user, exit if [ -x "/usr/bin/nicl" ]; then # 10.3 & 10.4 test [ $(nicl . -read /users/"$theUser" &> echo "User is a local user, aborting! elif [ -x "/usr/bin/dscl" ]; then # 10.5 test [ $(dscl . -read /users/"$theUser" &> echo "User is a local user, aborting! else echo "DS Tool not found. " && fi
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/dev/null) == 0 ] && " && exit 1 /dev/null) == 0 ] && " && exit 1 exit 1
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# specify our redirect folder, make sure it exists, # set ownership and permissions redirectDir=/Users/Local/"$theUser" mkdir p "$redirectDir" &> /dev/null chown "$theUser" "$redirectDir" chmod 700 "$redirectDir" # redirect ~/Library/Caches. For 10.3 compatability, # operations on the home directory must be performed as
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# the user. root does have write access to AFP shares. mkdir p "$redirectDir"/Library/Caches sudo u "$theUser" rm rf "$theHome"/Library/Caches sudo u "$theUser" ln s "$redirectDir"/Library/Caches \ "$theHome"/Library/Caches chown "$theUser "$redirectDir/Library/Caches" echo "Redirected $theHome/Library/Caches to \ $redirectDir/Library/Caches" exit 0
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Then the requisite logout hook (don t blink).
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#!/bin/sh PATH="/bin" # simple logout redirection script # get our user theUser=$1 # get our home eval theHome=~$1 # if there's a symlink, break it down [ -L $theHome /Library/Caches ] && rm "$theHome"/Library/Caches && echo "Removing symlink at $theHome/Library/Caches" exit 0
For the logouthook, you don t need to test for a local user. If the users are local they won t have a symlink to begin with. If they do, it shouldn t be there, so you may as well delete it. This is a pretty bare-bones login redirection script, and it doesn t have a ton of sanity checks. What if the destructive redirect destroys valuable data, and you need to move it rather than delete it What if a user is logged into two sessions at once When one instance is logged out, the other s symbolic links will be torn down, leading to an unstable environment. Therein lies the strength in loginhook based redirections, you can pretty much add any functionality that you re willing to invest time into scripting. Luckily, we ve invested that time so you don t have to. For a more feature packed login script, see the package 07_loginhooks.zip in the book s resources. You can find the code samples for this chapter in the Source Code/Download area of the Apress web site, www.apress.com. This zip file contains two shell scripts, loginhook, and logouthook, which are used to create and tear down redirection environments. See the loginhook scripts inline comments for more details on configuration and usage. Unfortunately, in reality network home directories just aren t well suited for certain uses. Apple discourages their use in Final Cut Studio workflows. Color in particular seems to have the most issues, it simply doesn t launch. Miscellaneous apps that are poorly coded may simply not behave properly. Sometimes these apps can be fooled into operating through redirections or preference modification, but not always. Make sure to
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