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Packages Suitable for Deployment

Per Olofsson edited this page Nov 4, 2013 · 2 revisions

Packages normally assume that they're being installed on the current host, but that's not true when you're building packages into an image. The installer is being run on the host system but with the target set to a disk image. There are several things that a package will need to observe to install successfully:

• No user is logged in

Packages that rely on a user launching the install will fail. This includes payloads that install into user's home directories, and scripts that make assumptions about $HOME or $USER.

• The host OS is not the same as the target OS

The host may be running one build of OS X while installing another.

• The installation target is not the system root

If the package has preinstall or postinstall scripts, they need to reference paths on the installation by prefixing them with "$3".

• Installation scripts run on the host

The preinstall and postinstall scripts run on the host OS during image building. Commands such as networksetup and scutil will interact with the host, not the image.

Recommendations

Less is more

Only include the packages you absolutely need in the image. Install everything else after the system has booted.

Avoid scripts

The only safe packages are those that only include a payload and no scripts.

Further reading

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