To reduce running time of git clone, we should avoid a full git clone
of the linux kernel repo. Instead, we shallow clone the repo, and
parse tags list by running `git ls-remote`.
If the current Flatcar release is already the latest Kernel, we should
simply exit with 0, without giving a failure status 1. The `exit 1`
would the otherwise result in a failure of the entire Github actions.
This commit add 2 different Github actions that run once in a day,
one for Alpha, Kernel 4.19, and the other for Edge, Kernel 5.5.
Because of limitations of Github Actions, i.e. create-pull-request
actions, we cannot combine the two actions into one.
Also we need to create a patch and apply it to the top source directory,
since the create-pull-request action requires the changes in the top
directory.
Although we are not updating flatcar-master branch, (only Alpha and
Edge) the Github actions files need to be merged to flatcar-master,
because Github actions can only schedule cron jobs from the default
branch, flatcar-master.
The caching git web view which was used as source location is not
reliable because the cache can be corrupt, the gzip compression of the
snapshot can change, and the cache is produced by the web server which
is not there to give high security guarantees. We experienced cache
corruption.
Switch to the recommended mirror under
https://mirrors.edge.kernel.org/pub/linux/kernel/firmware/
which also hosts signatures and not having the downsides mentioned
above. This is a downstream change until upstream Gentoo changes the
location.
The SDK package URL is constructed from FLATCAR_DEV_BUILDS in
build_library/toolchain_util.sh which caused the --dev-board flag
also to imply --dev-sdk. Using --no-dev-sdk didn't help.
Document this and work around it by setting the SDK URL explicitly
with --no-dev-sdk.
The environment variables FLATCAR_DEV_BUILDS and FLATCAR_DEV_BUILDS_SDK
define where the base URL for the binary package store of the board
packages and the SDK packages. To set it, they were either exported in
the chroot or passed each time as parameter but this was only available
for the SDK packages in the tricky order
"update_chroot --dev_builds_sdk URL" (or --binhost) and then
"./build_packages --skip_chroot_upgrade".
The defining information for binary package URL comes from version.txt
but it lacks the base URL for a convenient use. Add the base URLs for
SDK and board packages there to be able to get binary packages without
manual tricks and errors. Any changes to
~/trunk/.repo/manifests/version.txt will directly be picked up
from ./build_packages and friends to set the correct URLs in
/etc/portage/make.conf and /build/BOARD/etc/portage/make.conf
so that even a manual "emerge(-BOARD) --usepkg --getbinpkg" uses them.
A helper script "./set_version" is provided to ease modifying
~/trunk/.repo/manifests/version.txt by resolving the latest nightly
version.
Later this functionality can also be used to simplify the Jenkins code
which currently sets these variables (but the special case of the
Release Base download being different from the upload holds).
Update rust ebuild 1.44.1 to get it synced with upstream Gentoo.
Now that rust was updated to 1.44.1, we need to update patch files
and ebuilds, so that it can build without build failures.
