create yaml even if file already exists. This solves the problem of yaml
entry disapearing from latest-release.yaml on a re-run. the yaml is
recreated so we need to recreate every yaml, not only for the images
that are rebuilt.

This adds the necessary riggings to generate a standard Alpine image,
bootable via UEFI on the HiFive Unmatched (with some u-boot tweaks).

See https://twitter.com/sn0int/status/1408853982643212298

Olliver Schinagl authored 6 years ago and Natanael Copa committed 6 years ago

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

we dont need --extra-repository anymore but keep it for backwards
compatibility

we need remove the leading path to file

not enabled yet, but uncommenting the grub_mod should enable
building of isolinux+grubefi hybrid images. once uefi boot works
and is verified on aarch64, we can enable the vanilla iso image
(grsec does not support aarch64).

search for apkovl script in current dir, in ~/.mkimg and in the dir
where the mkimage script was started from.

use git tag if we are at a given tag. use timestamp otherwise

the boot repositry needs to be signed with a key. We explicitly copy
this to initramfs so users don't need use --hostkeys which requires
access to /etc/apk/keys/

without the key in intramfs the boot repository will be useless