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Add envkernel.sh: instant mainlining environment

Administrator requested to merge feature/envkernel.sh into master

Created by: ollieparanoid

Thanks to @Decatf for the idea of aliasing make! CC: @bhush9, @julian-goldsmith, @pavelmachek, @filippz, @flacks, @fourkbomb, @opendata26

Usage example

$ cd ~/code/linux
$ source ~/code/pmbootstrap/helpers/envkernel.sh
Initializing Alpine chroot (details: 'pmbootstrap log')
pmbootstrap envkernel.sh activated successfully.
 * kernel source:  /home/user/code/linux
 * output folder:  /home/user/code/linux/.output
 * architecture:   arm (samsung-i9100 is armhf)
 * aliases: make, kernelroot, pmbootstrap, pmbroot (see 'type make' etc.)

$ type make

make is an alias for echo '*** pmbootstrap envkernel.sh active for /home/user/code/linux! ***'; pmbootstrap -q chroot -- ARCH=arm CROSS_COMPILE=/usr/bin/armv6-alpine-linux-muslgnueabihf- make -C /mnt/linux O=/mnt/linux/.output

Notes

  • make menuconfig works as well
  • Sourcing was tested with zsh and bash, it should be easy to extend for other shells

Changes

  • new action pmbootstrap work_migrate: does the interactive work folder migration if necessary, otherwise it doesn't output anything
    • when calling this first, we can safely use all other commands non-interactively without showing the output
  • helpers/envkernel.sh:
    • installs everything needed for kernel compilation in the native chroot
    • mounts the kernel source to /mnt/linux inside the chroot
    • creates /mnt/linux/.output and chowns it to the pmos user, that folder will be used for the kernel build output
    • sets up aliases for make, pmbootstrap, pmbroot, kernelroot

Benefits

  • Fast setup (especially for people who are new to kernel compilation)
    • No need to figure out distribution specific package names (cross compilers!)
    • No need to do a test build just to verify that the right packages are installed
  • Less error prone
    • The right dependencies are always installed
    • ARCH and CROSS_COMPILE variables always get set automatically and based on deviceinfo_arch
    • If the build environment is broken for some reason, just zap and start over
  • Easy to reproduce problems

How to test

  • Source the script like shown above, then compile a full kernel

@MartijnBraam: I've used the SPDX license header here as you recommended in #postmarketOS-offtopic the other day. +1 for deploying that for the entire code base.

Closes #1356 (closed)

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