AnyKernel 2.0 - Flashable Zip Template for Kernel Releases with Ramdisk Modifications
by osm0sis @ xda-developers

"AnyKernel is a template for an update.zip that can apply any kernel to any ROM, regardless of ramdisk." - Koush

AnyKernel 2.0 pushes the format even further by allowing kernel developers to modify the underlying ramdisk for kernel feature support easily using a number of included command methods along with properties and variables.

A working script based on DirtyV Kernel for Galaxy Nexus (tuna) is included for reference.

// Properties / Variables

kernel.string=KernelName by YourName @ xda-developers
do.devicecheck=1
do.initd=1
do.modules=1
do.cleanup=1
device.name1=maguro
device.name2=toro
device.name3=toroplus
block=/dev/block/platform/omap/omap_hsmmc.0/by-name/boot;

do.devicecheck=1 specified requires at least device.name1 to be present. This should match ro.product.device or ro.build.product for your device. There is support for up to 5 device.name# properties.

do.initd=1 will create the init.d directory in /system/etc/init.d/ and apply 755 permissions.

do.modules=1 will push the contents of the module directory to /system/lib/modules/ and apply 644 permissions.

do.cleanup=0 will keep the zip from removing it's working directory in /tmp/anykernel - this can be useful if trying to debug in adb shell whether the patches worked correctly. 

// Command Methods

dump_boot
backup_file <file>
replace_string <file> <if search string> <original string> <replacement string>
insert_line <file> <if search string> <before/after> <line match string> <inserted line>
replace_line <file> <line replace string> <replacement line>
remove_line <file> <line match string>
prepend_file <file> <if search string> <patch file>
append_file <file> <if search string> <patch file>
replace_file <file> <permissions> <patch file>
write_boot

"if search string" is the string it looks for to decide whether it needs to add the tweak or not, so generally something to indicate the tweak already exists.

Similarly, "line match string" and "line replace string" are the search strings that locate where the modification needs to be made for those commands.

"before/after" requires you simply specify "before" or "after" for the placement of the inserted line, in relation to "line match string".

You may also use ui_print "<text>" to write messages back to the recovery during the modification process.

// Instructions

1- Place zImage in the root (dtb should also go here for devices that require a custom one)
2- Place any required ramdisk files in /ramdisk
3- Place any required patch files (generally partial files which go with commands) in /patch
4- Modify the anykernel.sh to add your kernel's name, boot partition location, permissions for included ramdisk files, and use methods for any required ramdisk modifications
5- zip -r9 UPDATE-AnyKernel2.zip * -x README UPDATE-AnyKernel2.zip

Not required, but any tweaks you can't hardcode into the source should be added with a bootscript.sh like is done in the example provided.


Have fun!