Alpine 3.9.0 ships a new version of the init script in it’s initramfs.
left: Alpine 3.9.0, right: Alpine 3.8.2
There are a number of interesting changes:
- better and earlier networking support for the boot process, with an additional kernel parameter for cmdline.txt: BOOTIF, allowing you to specify the device interface you want to use for boot purposes
- networking is started before the early console, which is probably very useful for debugging
- soft realtime clock is supported now, which should fix the problem with no hardware realtime clock available on the Raspberry Pi
- init as a new kernel parameter for cmdline.txt, allowing you to specify the init which will be run on switching into the newly setup system (default is /sbin/init )
- modloop verification support is added
More about modloop verification
if [ -f /var/cache/misc/*modloop*.SIGN.RSA.*.pub ]; then
mkdir -p „$sysroot“/var/cache/misc
cp /var/cache/misc/*modloop*.SIGN.RSA.*.pub „$sysroot“/var/cache/misc
This adds a preexisting key to the newly built system which lives under $sysroot before the switch at the end of execution of this init script, and adds the package libressl.
This is the key which is shipped with the initramfs:
More about init
You can specify the init command which is supposed to be ultimately executed as a new kernel parameter: