Additions to assist with pi-gen image customisation #790
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It's sometimes useful to perform post-processing on a stage build so add support for that.
Add new variable EXPORT_CONFIG_DIR to set the location of the scripts pigen will run when exporting an image. Setting this is optional. If not specified, the current location is retained. By utilising STAGE_LIST AND EXPORT_CONFIG_DIR, a user can construct custom images out-of-tree without modification to any defaults.
Scripts can call bootstrap64 to initialise an arm64 rootfs.
It may be useful for users to have some example pigen configurations more aligned with their needs, rather than using (or hacking) the default stages. The examples directory is intended to serve as a starting point. It's not intended to be production code. The min64 example is a minimal and generic 64-bit Debian system which boots kernel8, runs systemd with basic wired networking, and has a handful of core packages installed in a ~670MB rootfs.
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Hi @XECDesign
Here's a small set of commits plus introduction of an examples directory to help jump start projects, or to highlight anything in pi-gen we think would be valuable to users. We can add to examples/ as we see fit.
Supporting a postrun hook when processing stages allows a user to execute operations in that stage after all sub-stage actions have been executed.
The addition of EXPORT_CONFIG_DIR allows a user to define their own actions for image creation rather than using/editing the defaults. By using STAGE_LIST and EXPORT_CONFIG_DIR, a user has complete control over their image construction and generation without having to worry about rebasing/merging things when we make changes in the defaults.
The addition of bootstrap64 is to add a 64-bit debootstrap install wrapper so that a user can create a 64-bit custom image without having to switch to the arm64 branch. I think whoever invokes this (eg from a custom stage) should take responsibility of being able to run it on the Host, or I can a 'suitability test' to it if you'd prefer.
examples/min64 is a generic 64-bit target system with limited functionality, intended to serve as an example for users wishing to create a light-weight system.
Comments and feedback welcome.
Cheers,
-- Matt