diff --git a/build.md b/build.md index 8a7fb7a..569196d 100644 --- a/build.md +++ b/build.md @@ -1 +1,47 @@ # process + + +build kernel with initramfs + +initramfs ```/etc/init``` runs ```exec busybox switch_root /v3 /opt/wz_mini/etc/init.d/v3_init.sh``` + +```/opt/wz_mini/etc/init.d/v3_init.sh``` + +bind replace ```/etc/init.d/inittab``` with out own version that has rcS located at ```/opt/wz_mini/tmp/.storage/rcS``` + +bind replaces ```/etc/profile``` +mounts ```/tmp``` and ```/run``` +mounts ```/system``` +bind replaces ```/system/bin/factorycheck```, this program unmounts the binds that we do later in the file, its a debug program. +bind replaces ```/etc/fstab``` + +creates wz_mini's workplace directory at ```/opt/wz_mini/tmp``` +copies the stock ```/etc/init.d/rcS``` to the workplace directory +modifies the stock rcS, adds ```set -x``` debug mode and injects the following script ```/opt/wz_mini/etc/init.d/v3_post.sh``` ro run + +bind replaces ```/etc/shadow``` to change the stock password + +checks to see if the swap archive is present at ```/opt/wz_mini/swap.gz```, if it is, extracts it, then mkswap's it, and drops the vm cache. + +check to see if the ```/opt/wz_mini/usr/share/terminfo``` directory is present, if not, extract the terminfo files for console programs + +mounts ```/configs``` to check if the ```.ssh``` dir is present, a requirement for the dropbear ssh server + +checks to see if ```/opt/wz_mini/run_mmc.sh``` has debug mode enabled, if it does, skip loading ```/system/bin/app_init.sh``` and ```/media/mmc/wz_mini/run_mmc.sh``` + +run ```/media/mmc/wz_mini/run_mmc.sh```, but delay execution for 30 seconds, enough time for WiFi or wired ethernet/usb to load and connect successfully to the internet + +runs ```/linuxrc``` to kick off the stock boot process + +our modified inittab runs from ```/opt/wz_mini/tmp/.storage/rcS```, we have enabled set -x debug info, added ```/opt/wz_mini/bin``` and ```/opt/wz_mini/lib``` to the system PATH's, and added ```/opt/wz_mini/etc/init.d/v3_post.sh``` to run before ```/system/init/app_init.sh``` runs. + +```/opt/wz_mini/etc/init.d/v3_post.sh``` checks if ```run_mmc.sh``` has the RTSP server enabled, and if it does, we copy ```/system/bin/iCamera``` to our workplace directory at ```/opt/wz_mini/tmp/.storage/``` + +bind replace ```/system/bin/iCamera``` + +our version of iCamera is a script which injects the libcallback.so library as LD_PRELOAD to hook the Audio and Video to the RTSP Server, calling iCamera from it's new home at ```/opt/wz_mini/tmp/.storage/``` + +we then load the video loopback driver from ```/opt/wz_mini/lib/modules/v4l2loopback.ko``` + +```/system/bin/app_init.sh``` loads the stock system software +